Rename F1 examples folder.

2011-09-15 01:20:45 -07:00
parent ce7dd46aef
commit cff706e3ca
173 changed files with 127 additions and 0 deletions
--- a/examples/stm32f1/other/adc_temperature_sensor/Makefile
+++ b/examples/stm32f1/other/adc_temperature_sensor/Makefile
@@ -0,0 +1,23 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = adc
+
+include ../../Makefile.include
+
--- a/examples/stm32f1/other/adc_temperature_sensor/README
+++ b/examples/stm32f1/other/adc_temperature_sensor/README
@@ -0,0 +1,10 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This example program sends some characters on USART1.
+Afterwards it read out the internal temperature sensor of the STM32 and 
+sends the value read out from the ADC to the USART1.
+
+The terminal settings for the receiving device/PC are 115200 8n1.
+
--- a/examples/stm32f1/other/adc_temperature_sensor/adc.c
+++ b/examples/stm32f1/other/adc_temperature_sensor/adc.c
@@ -0,0 +1,155 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/flash.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+#include <libopencm3/stm32/adc.h>
+
+void usart_setup(void)
+{
+	/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_USART1EN);
+
+	/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+	              GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
+
+	/* Setup UART parameters. */
+	usart_set_baudrate(USART1, 115200);
+	usart_set_databits(USART1, 8);
+	usart_set_stopbits(USART1, USART_STOPBITS_1);
+	usart_set_mode(USART1, USART_MODE_TX_RX);
+	usart_set_parity(USART1, USART_PARITY_NONE);
+	usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+
+	/* Finally enable the USART. */
+	usart_enable(USART1);
+}
+
+void gpio_setup(void)
+{
+	/* Enable GPIOB clock. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
+
+	/* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
+}
+
+void adc_setup(void)
+{
+	int i;
+
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);
+
+	/* Make shure it doesn't run during config. */
+	adc_off(ADC1);
+
+	/* We configure everything for one single conversion. */
+	adc_disable_scan_mode(ADC1);
+	adc_set_single_conversion_mode(ADC1);
+	adc_enable_discontinous_mode_regular(ADC1);
+	adc_disable_external_trigger_regular(ADC1);
+	adc_set_right_aligned(ADC1);
+	/* We want to read the temperature sensor, so we have to enable it. */
+	adc_enable_temperature_sensor(ADC1);
+	adc_set_conversion_time_on_all_channels(ADC1, ADC_SMPR_SMP_28DOT5CYC);
+
+	adc_on(ADC1);
+
+	/* Wait for ADC starting up. */
+	for (i = 0; i < 800000; i++)    /* Wait a bit. */
+		__asm__("nop");
+
+	adc_reset_calibration(ADC1);
+	adc_calibration(ADC1);
+}
+
+void my_usart_print_int(u32 usart, int value)
+{
+	s8 i;
+	u8 nr_digits = 0;
+	char buffer[25];
+
+	if (value < 0) {
+		 usart_send(usart, '-');
+		 value = value * -1;
+	}
+	
+	while (value > 0) {
+		buffer[nr_digits++] = "0123456789"[value % 10];
+		value /= 10;
+	}
+	
+	for (i = nr_digits; i >= 0; i--)
+		usart_send(usart, buffer[i]);
+}
+
+int main(void)
+{
+	u8 channel_array[16];
+	u16 temperature;
+
+	rcc_clock_setup_in_hse_16mhz_out_72mhz();
+	gpio_setup();
+	usart_setup();
+	adc_setup();
+
+	gpio_clear(GPIOB, GPIO7);	/* LED1 on */
+	gpio_set(GPIOB, GPIO6);		/* LED2 off */
+
+	/* Send a message on USART1. */
+	usart_send(USART1, 's');
+	usart_send(USART1, 't');
+	usart_send(USART1, 'm');
+	usart_send(USART1, '\r');
+	usart_send(USART1, '\n');
+
+	/* Select the channel we want to convert. 16=temperature_sensor. */
+	channel_array[0] = 16;
+	adc_set_regular_sequence(ADC1, 1, channel_array);
+	
+	/*
+	 * If the ADC_CR2_ON bit is already set -> setting it another time
+	 * starts the conversion.
+	 */
+	adc_on(ADC1);
+	
+	/* Wait for end of conversion. */
+	while (!(ADC_SR(ADC1) & ADC_SR_EOC));
+	
+	temperature = ADC_DR(ADC1);
+
+	/*
+	 * That's actually not the real temperature - you have to compute it
+	 * as described in the datasheet.
+	 */
+	my_usart_print_int(USART1, temperature);
+
+	gpio_clear(GPIOB, GPIO6); /* LED2 on */
+
+	while(1); /* Halt. */
+
+	return 0;
+}
--- a/examples/stm32f1/other/adc_temperature_sensor/adc.ld
+++ b/examples/stm32f1/other/adc_temperature_sensor/adc.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for an STM32F103RBT6 board (128K flash, 20K RAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+
--- a/examples/stm32f1/other/dma_mem2mem/Makefile
+++ b/examples/stm32f1/other/dma_mem2mem/Makefile
@@ -0,0 +1,23 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = dma
+
+include ../../Makefile.include
+
--- a/examples/stm32f1/other/dma_mem2mem/README
+++ b/examples/stm32f1/other/dma_mem2mem/README
@@ -0,0 +1,11 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This program demonstrates a little DMA MEM2MEM transfer. A string is send out 
+to USART1 and afterwards copied by DMA to another memory location. To check
+if the transfer was successful we send the destination string also out to 
+USART1.
+
+The terminal settings for the receiving device/PC are 115200 8n1.
+
--- a/examples/stm32f1/other/dma_mem2mem/dma.c
+++ b/examples/stm32f1/other/dma_mem2mem/dma.c
@@ -0,0 +1,133 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/flash.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+#include <libopencm3/stm32/dma.h>
+
+void usart_setup(void)
+{
+	/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_USART1EN);
+
+	/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+	              GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
+
+	/* Setup UART parameters. */
+	usart_set_baudrate(USART1, 115200);
+	usart_set_databits(USART1, 8);
+	usart_set_stopbits(USART1, USART_STOPBITS_1);
+	usart_set_mode(USART1, USART_MODE_TX_RX);
+	usart_set_parity(USART1, USART_PARITY_NONE);
+	usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+
+	/* Finally enable the USART. */
+	usart_enable(USART1);
+}
+
+void gpio_setup(void)
+{
+	/* Enable GPIOB clock. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
+
+	/* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
+}
+
+void my_usart_print_string(u32 usart, char * s)
+{
+	while (*s != 0) {
+		usart_send(usart, *s);
+		s++;
+	}
+}
+
+int main(void)
+{
+	/* Exactly 20 bytes including '0' at the end.
+	   We want to transfer 32bit * 5 so it should fit */
+	char s1[20] = "Hello STM MEM2MEM\r\n";
+	char s2[20];
+
+        rcc_clock_setup_in_hse_16mhz_out_72mhz();
+	gpio_setup();
+	usart_setup();
+
+	gpio_clear(GPIOB, GPIO7);	/* LED1 on */
+	gpio_set(GPIOB, GPIO6);		/* LED2 off */
+
+	my_usart_print_string(USART1, "s1 ");
+	my_usart_print_string(USART1, s1);
+
+	rcc_peripheral_enable_clock(&RCC_AHBENR, RCC_AHBENR_DMA1EN);
+
+	/* MEM2MEM mode for channel 1. */
+	dma_enable_mem2mem_mode(DMA1, DMA_CHANNEL1);
+
+	/* Highest priority. */
+	dma_set_priority(DMA1, DMA_CHANNEL1, DMA_CCR1_PL_VERY_HIGH);
+
+	/* 32Bit wide transfer for source and destination. */
+	dma_set_memory_size(DMA1, DMA_CHANNEL1, DMA_CCR1_MSIZE_32BIT);
+	dma_set_peripheral_size(DMA1, DMA_CHANNEL1, DMA_CCR1_PSIZE_32BIT);
+
+	/* After each 32Bit we have to increase the addres because we use RAM. */
+	dma_enable_memory_increment_mode(DMA1, DMA_CHANNEL1);
+	dma_enable_peripheral_increment_mode(DMA1, DMA_CHANNEL1);
+
+	/* We define the source as peripheral. */
+	dma_set_read_from_peripheral(DMA1, DMA_CHANNEL1);
+
+	/* We want to transfer string s1. */
+	dma_set_peripheral_address(DMA1, DMA_CHANNEL1, (u32) &s1);
+
+	/* Destination should be string s2. */
+	dma_set_memory_address(DMA1, DMA_CHANNEL1, (u32) &s2);
+
+	/* Set number of DATA to transfer.
+	   Remember that this means not necessary bytes but MSIZE or PSIZE
+	   depending from your source device. */
+	dma_set_number_of_data(DMA1, DMA_CHANNEL1, 5); 
+
+	/* Start DMA transfer. */
+	dma_enable_channel(DMA1, DMA_CHANNEL1);
+
+	/* TODO: write a function to get the interrupt flags. */
+	while(!(DMA_ISR(DMA1) & 0x0000001))
+	{
+	}
+
+	dma_disable_channel(DMA1, DMA_CHANNEL1);
+
+	/* String s1 should now already be transferred to s2. */
+	my_usart_print_string(USART1, "s2 ");
+	my_usart_print_string(USART1, s2);
+
+	gpio_clear(GPIOB, GPIO6);	/* LED2 on */
+	while(1); /* Halt. */
+
+	return 0;
+}
--- a/examples/stm32f1/other/dma_mem2mem/dma.ld
+++ b/examples/stm32f1/other/dma_mem2mem/dma.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for an STM32F103RBT6 board (128K flash, 20K RAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+
--- a/examples/stm32f1/other/dogm128/Makefile
+++ b/examples/stm32f1/other/dogm128/Makefile
@@ -0,0 +1,25 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = main
+
+OBJS = dogm128.o
+
+include ../../Makefile.include
+
--- a/examples/stm32f1/other/dogm128/README
+++ b/examples/stm32f1/other/dogm128/README
@@ -0,0 +1,7 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This example program writes some text on an DOGM128 LCD display connected
+to SPI2.
+
--- a/examples/stm32f1/other/dogm128/dogm128.c
+++ b/examples/stm32f1/other/dogm128/dogm128.c
@@ -0,0 +1,291 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "./dogm128.h"
+
+u8 dogm128_ram[1024];
+u8 dogm128_cursor_x;
+u8 dogm128_cursor_y;
+
+void dogm128_send_command(u8 command)
+{
+	u32 counter;
+
+	gpio_clear(DOGM128_A0_PORT, DOGM128_A0_PIN);      /* A0 low for commands */
+	spi_send(DOGM128_SPI, command);
+
+       	for (counter = 0; counter<=500; counter++) /* wait */
+       	{}
+}
+
+void dogm128_send_data(u8 data)
+{
+	u32 counter;
+
+	gpio_set(DOGM128_A0_PORT, DOGM128_A0_PIN);      /* A0 high for data */
+	spi_send(DOGM128_SPI, data);
+
+       	for (counter = 0; counter<=500; counter++) /* wait */
+       	{}
+}
+
+void dogm128_init()
+{
+	u32 counter;
+
+	/* reset the display */
+        gpio_clear(DOGM128_RESET_PORT, DOGM128_RESET_PIN);      /* reset low for dogm128 */
+        for (counter = 0; counter<=60000; counter++) /* wait */
+        {}
+        gpio_set(DOGM128_RESET_PORT, DOGM128_RESET_PIN);        /* reset high for dogm128 */
+
+        for (counter = 0; counter<=60000; counter++) /* wait */
+        {}
+
+        gpio_clear(DOGM128_A0_PORT, DOGM128_A0_PIN);      /* A0 low for init */
+
+	/* tell the display that we want to start */
+        spi_set_nss_low(DOGM128_SPI);
+
+	/* init sequence */
+        dogm128_send_command(DOGM128_DISPLAY_START_ADDRESS_BASE + 0);
+        dogm128_send_command(DOGM128_ADC_REVERSE);
+        dogm128_send_command(DOGM128_COM_OUTPUT_SCAN_NORMAL);
+        dogm128_send_command(DOGM128_DISPLAY_NORMAL);
+        dogm128_send_command(DOGM128_BIAS_19);
+        dogm128_send_command(DOGM128_POWER_CONTROL_BASE + 0x07);
+        dogm128_send_command(DOGM128_BOOSTER_RATIO_SET);
+        dogm128_send_command(0x00); /* Booster x4 */
+        dogm128_send_command(DOGM128_V0_OUTPUT_RESISTOR_BASE + 0x07);
+        dogm128_send_command(DOGM128_ELECTRONIC_VOLUME_MODE_SET);
+        dogm128_send_command(0x16); /* Contrast */
+        dogm128_send_command(DOGM128_STATIC_INDICATOR_OFF);
+        dogm128_send_command(0x00); /* Flashing OFF */
+        dogm128_send_command(DOGM128_DISPLAY_ON);
+
+	/* end transfer */
+        spi_set_nss_high(DOGM128_SPI);
+}
+
+void dogm128_print_char(u8 data)
+{
+	u8 i;
+	u8 page;
+	u8 shift;
+	u8 xcoord;
+	u8 ycoord;
+
+	xcoord = dogm128_cursor_x;
+	ycoord = dogm128_cursor_y;
+
+	page = (63 - ycoord) / 8; /* the display consists of 8 lines a 8 dots each. */
+	shift = (7 -((63 - ycoord) % 8)); /* vertical shift */
+
+	/* font is 8x5 so iterate each column of the character */	
+	for (i = 0; i <= 5; i++) {
+		/* right border reached? */
+		if ((xcoord + i) > 127)
+			return;
+		dogm128_cursor_x++;
+
+		/* 0xAA = end of character - no dots in this line */
+		if (dogm128_font[data - 0x20][i] == 0xAA) { 
+			dogm128_ram[(page * 128) + xcoord + i] &= ~(0xFF >> shift); /* clear area */
+			if ((shift > 0) && (page > 0)) 
+				dogm128_ram[((page - 1) * 128) + xcoord + i] &= ~(0xFF << (8 - shift)); /* clear area */
+			return;
+		}
+
+		/* lower part */
+		dogm128_ram[(page * 128) + xcoord + i] &= ~(0xFF >> shift); /* clear area */
+		dogm128_ram[(page * 128) + xcoord + i] = (dogm128_font[data - 0x20][i] >> shift);
+		/* higher part if needed */
+		if ((shift > 0) && (page > 0)) {
+			dogm128_ram[((page - 1) * 128) + xcoord + i] &= ~(0xFF << (8 - shift)); /* clear area */
+			dogm128_ram[((page - 1) * 128) + xcoord + i] = (dogm128_font[data - 0x20][i] << (8 - shift)); 
+		}
+	}
+}
+
+void dogm128_set_cursor(u8 xcoord, u8 ycoord)
+{
+	dogm128_cursor_x = xcoord;
+	dogm128_cursor_y = ycoord;
+}
+
+void dogm128_print_string(char * s)
+{
+	while (*s != 0) {
+		dogm128_print_char(*s);
+		s++;
+	}
+}
+
+void dogm128_set_dot(u8 xcoord, u8 ycoord)
+{
+	dogm128_ram[(((63 - ycoord) / 8) * 128) + xcoord] |= (1 << ((63 - ycoord) % 8)); 
+}
+
+void dogm128_clear_dot(u8 xcoord, u8 ycoord)
+{
+	dogm128_ram[(((63 - ycoord) / 8) * 128) + xcoord] &= ~(1 << ((63 - ycoord) % 8)); 
+}
+
+void dogm128_update_display()
+{
+	u8 page;
+	u8 column;
+
+	/* tell the display that we want to start */
+        spi_set_nss_low(DOGM128_SPI);
+
+	for (page = 0; page <= 7; page++) {
+        	dogm128_send_command(0xB0 + page); /* set page */
+		dogm128_send_command(0x10); /* set column upper address to 0 */
+		dogm128_send_command(0x00); /* set column lower address to 0 */
+
+		for (column = 0; column <= 127; column++) {
+			dogm128_send_data(dogm128_ram[(page * 128) + column]);
+		}
+	}
+	
+        spi_set_nss_high(DOGM128_SPI);
+}
+
+void dogm128_clear()
+{
+	u16 i;
+	
+	for (i = 0; i<=1023; i++) {
+		dogm128_ram[i] = 0;
+	}	
+	dogm128_update_display();
+}
+
+/* This is a non-monospace font definition (upside down for better handling).
+ * 0xAA is the end of the character so its not space efficient in your memory, but on your display.
+ * We are starting with " " as the first printable character at 0x20, so we have to substract 0x20 later.
+ * Its the only defined to 127/0x7F so if you have german umlauts or other special characters from above
+ * you have to expand this definition a little bit. */
+
+const u8 dogm128_font[96][6] = {
+
+  /* 20 SPACE  */  {0x00, 0x00, 0x00, 0xAA, 0xAA, 0xAA},
+  /* 21 ! */  {0x5E, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 22 " */  {0x66, 0x00, 0x66, 0xAA, 0xAA, 0xAA},
+  /* 23 # */  {0x28, 0x7C, 0x28, 0x7C, 0x28, 0xAA},
+  /* 24 $ */  {0x24, 0x2A, 0x7F, 0x2A, 0x10, 0xAA},
+  /* 25 % */  {0x62, 0x18, 0x46, 0xAA, 0xAA, 0xAA},
+  /* 26 & */  {0x30, 0x4C, 0x5A, 0x24, 0x50, 0xAA}, 
+  /* 27 ' */  {0x06, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 28 ( */  {0x3E, 0x41, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 29 ) */  {0x41, 0x3E, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 2A * */  {0x28, 0x10, 0x7C, 0x10, 0x28, 0xAA}, 
+  /* 2B + */  {0x10, 0x38, 0x10, 0xAA, 0xAA, 0xAA},
+  /* 2C , */  {0xC0, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 2D - */  {0x10, 0x10, 0x10, 0xAA, 0xAA, 0xAA},
+  /* 2E . */  {0x40, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 2F / */  {0x60, 0x18, 0x06, 0xAA, 0xAA, 0xAA},
+
+  /* 30 0 */  {0x3C, 0x42, 0x42, 0x3C, 0xAA, 0xAA}, 
+  /* 31 1 */  {0x44, 0x7E, 0x40, 0xAA, 0xAA, 0xAA},
+  /* 32 2 */  {0x44, 0x62, 0x52, 0x4C, 0xAA, 0xAA},
+  /* 33 3 */  {0x4A, 0x4A, 0x34, 0xAA, 0xAA, 0xAA},
+  /* 34 4 */  {0x1E, 0x10, 0x78, 0x10, 0xAA, 0xAA},
+  /* 35 5 */  {0x4E, 0x4A, 0x32, 0xAA, 0xAA, 0xAA},
+  /* 36 6 */  {0x3C, 0x4A, 0x4A, 0x30, 0xAA, 0xAA},
+  /* 37 7 */  {0x62, 0x12, 0x0E, 0xAA, 0xAA, 0xAA},
+  /* 38 8 */  {0x34, 0x4A, 0x4A, 0x34, 0xAA, 0xAA},
+  /* 39 9 */  {0x0C, 0x52, 0x52, 0x3C, 0xAA, 0xAA},
+  /* 3A : */  {0x28, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 3B ; */  {0xC8, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 3C < */  {0x10, 0x28, 0x44, 0xAA, 0xAA, 0xAA},
+  /* 3D = */  {0x28, 0x28, 0x28, 0xAA, 0xAA, 0xAA},
+  /* 3E > */  {0x44, 0x28, 0x10, 0xAA, 0xAA, 0xAA},
+  /* 3F ? */  {0x02, 0x52, 0x0C, 0xAA, 0xAA, 0xAA},
+
+  /* 40 @ */  {0x3C, 0x42, 0x12, 0x2A, 0x3C, 0xAA},
+  /* 41 A */  {0x7C, 0x12, 0x12, 0x7C, 0xAA, 0xAA},
+  /* 42 B */  {0x7E, 0x4A, 0x4A, 0x34, 0xAA, 0xAA},
+  /* 43 C */  {0x3C, 0x42, 0x42, 0x24, 0xAA, 0xAA},
+  /* 44 D */  {0x7E, 0x42, 0x42, 0x3C, 0xAA, 0xAA},
+  /* 45 E */  {0x7E, 0x4A, 0x4A, 0xAA, 0xAA, 0xAA},
+  /* 46 F */  {0x7E, 0x0A, 0x0A, 0xAA, 0xAA, 0xAA},
+  /* 47 G */  {0x3C, 0x42, 0x52, 0x34, 0xAA, 0xAA},
+  /* 48 H */  {0x7E, 0x08, 0x08, 0x7E, 0xAA, 0xAA},
+  /* 49 I */  {0x42, 0x7E, 0x42, 0xAA, 0xAA, 0xAA},
+  /* 4A J */  {0x42, 0x42, 0x3E, 0xAA, 0xAA, 0xAA},
+  /* 4B K */  {0x7E, 0x08, 0x14, 0x62, 0xAA, 0xAA},
+  /* 4C L */  {0x7E, 0x40, 0x40, 0xAA, 0xAA, 0xAA},
+  /* 4D M */  {0x7E, 0x04, 0x08, 0x04, 0x7E, 0xAA},
+  /* 4E N */  {0x7E, 0x04, 0x18, 0x20, 0x7E, 0xAA},
+  /* 4F O */  {0x3C, 0x42, 0x42, 0x3C, 0xAA, 0xAA},
+
+  /* 50 P */  {0x7E, 0x12, 0x12, 0x0C, 0xAA, 0xAA},
+  /* 51 Q */  {0x3C, 0x42, 0x42, 0xBC, 0xAA, 0xAA},
+  /* 52 R */  {0x7E, 0x12, 0x12, 0x6C, 0xAA, 0xAA},
+  /* 53 S */  {0x44, 0x4A, 0x4A, 0x30, 0xAA, 0xAA},
+  /* 54 T */  {0x02, 0x7E, 0x02, 0xAA, 0xAA, 0xAA},
+  /* 55 U */  {0x3E, 0x40, 0x40, 0x3E, 0xAA, 0xAA},
+  /* 56 V */  {0x06, 0x18, 0x60, 0x18, 0x06, 0xAA},
+  /* 57 W */  {0x3E, 0x40, 0x3E, 0x40, 0x3E, 0xAA},
+  /* 58 X */  {0x42, 0x24, 0x18, 0x24, 0x42, 0xAA},
+  /* 59 Y */  {0x9E, 0xA0, 0xA0, 0x7E, 0xAA, 0xAA},
+  /* 5A Z */  {0x62, 0x52, 0x4A, 0x46, 0xAA, 0xAA},
+  /* 5B [ */  {0x7E, 0x42, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 5C \ */  {0x06, 0x18, 0x60, 0xAA, 0xAA, 0xAA},
+  /* 5D ] */  {0x42, 0x7E, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 5E ^ */  {0x04, 0x02, 0x04, 0xAA, 0xAA, 0xAA},
+  /* 5F _ */  {0x40, 0x40, 0x40, 0xAA, 0xAA, 0xAA},
+
+  /* 60 ` */  {0x02, 0x04, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 61 a */  {0x20, 0x54, 0x54, 0x78, 0xAA, 0xAA},
+  /* 62 b */  {0x7E, 0x44, 0x44, 0x38, 0xAA, 0xAA},
+  /* 63 c */  {0x38, 0x44, 0x44, 0x28, 0xAA, 0xAA},
+  /* 64 d */  {0x38, 0x44, 0x44, 0x7E, 0xAA, 0xAA},
+  /* 65 e */  {0x38, 0x54, 0x54, 0x58, 0xAA, 0xAA},
+  /* 66 f */  {0x7C, 0x0A, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 67 g */  {0x98, 0xA4, 0xA4, 0x7C, 0xAA, 0xAA},
+  /* 68 h */  {0x7E, 0x04, 0x04, 0x78, 0xAA, 0xAA},
+  /* 69 i */  {0x7A, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 6A j */  {0x40, 0x3A, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 6B k */  {0x7E, 0x10, 0x28, 0x44, 0xAA, 0xAA},
+  /* 6C l */  {0x7E, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 6D m */  {0x7C, 0x04, 0x78, 0x04, 0x78, 0xAA},
+  /* 6E n */  {0x7C, 0x04, 0x04, 0x78, 0xAA, 0xAA},
+  /* 6F o */  {0x38, 0x44, 0x44, 0x38, 0xAA, 0xAA},
+
+  /* 70 p */  {0xFC, 0x24, 0x24, 0x18, 0xAA, 0xAA},
+  /* 71 q */  {0x18, 0x24, 0x24, 0xFC, 0xAA, 0xAA},
+  /* 72 r */  {0x78, 0x04, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 73 s */  {0x48, 0x54, 0x54, 0x20, 0xAA, 0xAA},
+  /* 74 t */  {0x04, 0x3E, 0x44, 0xAA, 0xAA, 0xAA},
+  /* 75 u */  {0x3C, 0x40, 0x40, 0x3C, 0xAA, 0xAA},
+  /* 76 v */  {0x0C, 0x30, 0x40, 0x30, 0x0C, 0xAA},
+  /* 77 w */  {0x3C, 0x40, 0x3C, 0x40, 0x3C, 0xAA},
+  /* 78 x */  {0x44, 0x28, 0x10, 0x28, 0x44, 0xAA},
+  /* 79 y */  {0x1C, 0xA0, 0xA0, 0x7C, 0xAA, 0xAA},
+  /* 7A z */  {0x64, 0x54, 0x4C, 0xAA, 0xAA, 0xAA},
+  /* 7B { */  {0x08, 0x36, 0x41, 0xAA, 0xAA, 0xAA},
+  /* 7C | */  {0x7E, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
+  /* 7D } */  {0x41, 0x36, 0x08, 0xAA, 0xAA, 0xAA},
+  /* 7E ~ */  {0x20, 0x10, 0x20, 0x10, 0xAA, 0xAA},
+  /* 7F DEL  */  {0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA} 
+};
+
--- a/examples/stm32f1/other/dogm128/dogm128.h
+++ b/examples/stm32f1/other/dogm128/dogm128.h
@@ -0,0 +1,86 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef DOGM128_H
+#define DOGM128_H
+
+#include <libopencm3/cm3/common.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/spi.h>
+
+/* PB10 GPIO       - ~RESET 
+ * PB12 SPI2_NSS   - ~CS1
+ * PB13 SPI2_SCK   - SCL 
+ * PB14 SPI2_MISO  - A0 
+ * PB15 SPI2_MOSI  - SI */
+
+#define DOGM128_SPI				SPI2
+#define DOGM128_RESET_PIN			GPIO10
+#define DOGM128_RESET_PORT			GPIOB
+#define DOGM128_A0_PIN				GPIO14
+#define DOGM128_A0_PORT				GPIOB
+
+/* DOGM128 display commands */
+#define DOGM128_PAGE_BASE			0xB0
+#define DOGM128_PAGE0				0xB0
+#define DOGM128_PAGE1				0xB1
+#define DOGM128_PAGE2				0xB2
+#define DOGM128_PAGE3				0xB3
+#define DOGM128_PAGE4				0xB4
+#define DOGM128_PAGE5				0xB5
+#define DOGM128_PAGE6				0xB6
+#define DOGM128_PAGE7				0xB7
+#define DOGM128_DISPLAY_ON			0xAF
+#define DOGM128_DISPLAY_OFF			0xAE
+#define DOGM128_DISPLAY_START_ADDRESS_BASE	0x40
+#define DOGM128_ADC_NORMAL			0xA0
+#define DOGM128_ADC_REVERSE			0xA1
+#define DOGM128_DISPLAY_NORMAL			0xA6
+#define DOGM128_DISPLAY_REVERSE			0xA7
+#define DOGM128_ALL_POINTS_ON			0xA5
+#define DOGM128_ALL_POINTS_OFF			0xA4
+#define DOGM128_BIAS_19				0xA2
+#define DOGM128_BIAS_17				0xA3
+#define DOGM128_INTERNAL_RESET			0xE2
+#define DOGM128_COM_OUTPUT_SCAN_NORMAL		0xC0
+#define DOGM128_COM_OUTPUT_SCAN_REVERSE		0xC8
+#define DOGM128_POWER_CONTROL_BASE		0x28
+#define DOGM128_V0_OUTPUT_RESISTOR_BASE		0x20
+#define DOGM128_ELECTRONIC_VOLUME_MODE_SET	0x81
+#define DOGM128_STATIC_INDICATOR_OFF		0xAC
+#define DOGM128_STATIC_INDICATOR_ON		0xAD
+#define DOGM128_BOOSTER_RATIO_SET		0xF8
+
+extern const u8 dogm128_font[96][6];
+extern u8 dogm128_ram[1024];
+extern u8 dogm128_cursor_x;
+extern u8 dogm128_cursor_y;
+
+void dogm128_send_command(u8 command);
+void dogm128_set_cursor(u8 xcoord, u8 ycoord);
+void dogm128_print_char(u8 data);
+void dogm128_print_string(char * s);
+void dogm128_set_dot(u8 xcoord, u8 ycoord);
+void dogm128_clear_dot(u8 xcoord, u8 ycoord);
+void dogm128_send_data(u8 data);
+void dogm128_init();
+void dogm128_update_display();
+void dogm128_clear();
+
+#endif
--- a/examples/stm32f1/other/dogm128/main.c
+++ b/examples/stm32f1/other/dogm128/main.c
@@ -0,0 +1,110 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/flash.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+#include <libopencm3/stm32/timer.h>
+#include <libopencm3/stm32/nvic.h>
+#include <libopencm3/stm32/spi.h>
+#include "./dogm128.h"
+
+void gpio_setup(void)
+{
+	/* Enable GPIOB clock. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
+
+	/* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
+
+	/* A0 of DOGM128 */
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO14);
+	/*reset of DOGM128 */
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO10);
+
+	/* DOGM128/SPI2 clock and MOSI and NSS(CS1) */
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+	              GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO12);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+	              GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO13);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+	              GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO15);
+}
+
+void spi_setup()
+{
+	/* the DOGM128 display is connected to SPI2, so initialise it correctly */
+
+	rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_SPI2EN);
+
+        spi_set_unidirectional_mode(DOGM128_SPI); /* we want to send only */
+        spi_disable_crc(DOGM128_SPI); /* no CRC for this slave */
+        spi_set_dff_8bit(DOGM128_SPI); /* 8-bit dataword-length */
+        spi_set_full_duplex_mode(DOGM128_SPI);  /* not receive-only */
+        spi_enable_software_slave_management(DOGM128_SPI); /* we want to handle the CS signal in software */
+        spi_set_nss_high(DOGM128_SPI);
+        spi_set_baudrate_prescaler(DOGM128_SPI, SPI_CR1_BR_FPCLK_DIV_256); /* PCLOCK/256 as clock */
+        spi_set_master_mode(DOGM128_SPI); /* we want to control everything and generate the clock -> master */
+        spi_set_clock_polarity_1(DOGM128_SPI); /* sck idle state high */
+        spi_set_clock_phase_1(DOGM128_SPI); /* bit is taken on the second (rising edge) of sck */
+        spi_enable_ss_output(DOGM128_SPI);
+        spi_enable(DOGM128_SPI);
+}
+
+int main(void)
+{
+	rcc_clock_setup_in_hse_16mhz_out_72mhz();
+	gpio_setup();
+	spi_setup();
+
+	gpio_clear(GPIOB, GPIO7);	/* LED1 on */
+	gpio_set(GPIOB, GPIO6);		/* LED2 off */
+	
+	dogm128_init();
+	dogm128_clear();
+
+	dogm128_set_cursor(0, 56);
+	dogm128_print_string("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
+	dogm128_set_cursor(0, 48);
+	dogm128_print_string("abcdefghijklmnopqrstuvwxyz");
+	dogm128_set_cursor(0, 40);
+	dogm128_print_string(" !#$%&'()*+,-./0123456789");
+	dogm128_set_cursor(0, 32);
+	dogm128_print_string(":;<=>?@[\\]^_`{|}~");
+	
+	dogm128_set_dot(10, 10);
+	dogm128_set_dot(20, 10);
+	dogm128_set_dot(30, 10);
+	dogm128_set_dot(40, 10);
+	dogm128_set_dot(50, 10);
+	
+	dogm128_update_display();
+
+	gpio_set(GPIOB, GPIO7);	/* LED1 off */
+	while(1); /* Halt. */
+
+	return 0;
+}
+
--- a/examples/stm32f1/other/dogm128/main.ld
+++ b/examples/stm32f1/other/dogm128/main.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for an STM32F103RBT6 board (128K flash, 20K RAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+
--- a/examples/stm32f1/other/i2c_stts75_sensor/Makefile
+++ b/examples/stm32f1/other/i2c_stts75_sensor/Makefile
@@ -0,0 +1,25 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = i2c_stts75_sensor
+
+OBJS = stts75.o
+
+include ../../Makefile.include
+
--- a/examples/stm32f1/other/i2c_stts75_sensor/README
+++ b/examples/stm32f1/other/i2c_stts75_sensor/README
@@ -0,0 +1,13 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This example program sends some characters on USART1.
+Afterwards it connects to an STTS75 sensor (ST LM75 compatible)
+at adress A0/1/2=0 and sets reverse polarity, 26 degree Tos and Thyst.
+
+It reads out the temperature and submits the temperature over USART1 in
+binary format (ASCII 0/1).
+
+The terminal settings for the receiving device/PC are 115200 8n1.
+
--- a/examples/stm32f1/other/i2c_stts75_sensor/i2c_stts75_sensor.c
+++ b/examples/stm32f1/other/i2c_stts75_sensor/i2c_stts75_sensor.c
@@ -0,0 +1,146 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/flash.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+#include <libopencm3/stm32/i2c.h>
+#include "stts75.h"
+
+void usart_setup(void)
+{
+	/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_USART1EN);
+
+	/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+	              GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
+
+	/* Setup UART parameters. */
+	usart_set_baudrate(USART1, 115200);
+	usart_set_databits(USART1, 8);
+	usart_set_stopbits(USART1, USART_STOPBITS_1);
+	usart_set_mode(USART1, USART_MODE_TX_RX);
+	usart_set_parity(USART1, USART_PARITY_NONE);
+	usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+
+	/* Finally enable the USART. */
+	usart_enable(USART1);
+}
+
+void gpio_setup(void)
+{
+	/* Enable GPIOB clock. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
+
+	/* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
+}
+
+void i2c_setup(void)
+{
+	/* Enable clocks for I2C2 and AFIO. */
+	rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_I2C2EN);
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN);
+
+	/* Set alternate functions for the SCL and SDA pins of I2C2. */
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+		      GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN,
+		      GPIO_I2C2_SCL | GPIO_I2C2_SDA);
+
+	/* Disable the I2C before changing any configuration. */
+	i2c_peripheral_disable(I2C2);
+
+	/* APB1 is running at 36MHz. */
+	i2c_set_clock_frequency(I2C2, I2C_CR2_FREQ_36MHZ);
+
+	/* 400KHz - I2C Fast Mode */
+	i2c_set_fast_mode(I2C2);
+
+	/*
+	 * fclock for I2C is 36MHz APB2 -> cycle time 28ns, low time at 400KHz
+	 * incl trise -> Thigh= 1600ns; CCR= tlow/tcycle= 0x1C,9;
+	 * datasheet suggests 0x1e.
+	 */
+	i2c_set_ccr(I2C2, 0x1e);
+
+	/*
+	 * fclock for I2C is 36MHz -> cycle time 28ns, rise time for
+	 * 400KHz => 300ns and 100KHz => 1000ns; 300ns/28ns = 10;
+	 * incremented by 1 -> 11.
+	 */
+	i2c_set_trise(I2C2, 0x0b);
+
+	/*
+	 * This is our slave address - needed only if we want to receive from
+	 * other masters.
+	 */
+	i2c_set_own_7bit_slave_address(I2C2, 0x32);
+
+	/* If everything is configured -> enable the peripheral. */
+	i2c_peripheral_enable(I2C2);
+}
+
+int main(void)
+{
+	int i = 0;
+	u16 temperature;
+
+        rcc_clock_setup_in_hse_16mhz_out_72mhz();
+	gpio_setup();
+	usart_setup();
+	i2c_setup();
+
+	gpio_clear(GPIOB, GPIO7);	/* LED1 on */
+	gpio_set(GPIOB, GPIO6);		/* LED2 off */
+
+	/* Send a message on USART1. */
+	usart_send(USART1, 's');
+	usart_send(USART1, 't');
+	usart_send(USART1, 'm');
+	usart_send(USART1, '\r');
+	usart_send(USART1, '\n');
+
+	stts75_write_config(I2C2, STTS75_SENSOR0);
+	stts75_write_temp_os(I2C2, STTS75_SENSOR0, 0x1a00); /* 26 degrees */
+	stts75_write_temp_hyst(I2C2, STTS75_SENSOR0, 0x1a00);
+	temperature = stts75_read_temperature(I2C2, STTS75_SENSOR0);
+
+	/* Send the temperature as binary over USART1. */
+	for (i = 15; i >= 0 ; i--) {
+		if (temperature & (1 << i))
+			usart_send(USART1, '1');
+		else
+			usart_send(USART1, '0');
+	}
+
+	usart_send(USART1, '\r');
+	usart_send(USART1, '\n');
+
+	gpio_clear(GPIOB, GPIO6); /* LED2 on */
+
+	while(1); /* Halt. */
+
+	return 0;
+}
--- a/examples/stm32f1/other/i2c_stts75_sensor/i2c_stts75_sensor.ld
+++ b/examples/stm32f1/other/i2c_stts75_sensor/i2c_stts75_sensor.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for an STM32F103RBT6 board (128K flash, 20K RAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+
--- a/examples/stm32f1/other/i2c_stts75_sensor/stts75.c
+++ b/examples/stm32f1/other/i2c_stts75_sensor/stts75.c
@@ -0,0 +1,186 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/i2c.h>
+#include "stts75.h"
+
+void stts75_write_config(u32 i2c, u8 sensor)
+{
+	u32 reg32;
+
+	/* Send START condition. */
+	i2c_send_start(i2c);
+
+	/* Waiting for START is send and switched to master mode. */
+	while (!((I2C_SR1(i2c) & I2C_SR1_SB)
+		& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
+
+	/* Send destination address. */
+	i2c_send_7bit_address(i2c, sensor, I2C_WRITE);
+
+	/* Waiting for address is transferred. */
+	while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
+
+	/* Cleaning ADDR condition sequence. */
+	reg32 = I2C_SR2(i2c);
+
+	/* Sending the data. */
+	i2c_send_data(i2c, 0x1); /* stts75 config register */
+	while (!(I2C_SR1(i2c) & I2C_SR1_BTF)); /* Await ByteTransferedFlag. */
+	i2c_send_data(i2c, 0x4); /* pol reverse - LED glows if temp is below Tos/Thyst */
+	while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE)));
+
+	/* Send STOP condition. */
+	i2c_send_stop(i2c);
+}
+
+void stts75_write_temp_os(u32 i2c, u8 sensor, u16 temp_os)
+{
+	u32 reg32;
+
+	/* Send START condition. */
+	i2c_send_start(i2c);
+
+	/* Waiting for START is send and switched to master mode. */
+	while (!((I2C_SR1(i2c) & I2C_SR1_SB)
+		& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
+
+	/* Send destination address. */
+	i2c_send_7bit_address(i2c, sensor, I2C_WRITE);
+
+	/* Waiting for address is transferred. */
+	while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
+
+	/* Cleaning ADDR condition sequence. */
+	reg32 = I2C_SR2(i2c);
+
+	/* Sending the data. */
+	i2c_send_data(i2c, 0x3); /* OvertemperatureShutdown register */
+	while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
+	i2c_send_data(i2c, (u8)(temp_os >> 8)); /* MSB */
+	while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
+	i2c_send_data(i2c, (u8)(temp_os & 0xff00)); /* LSB  */
+	while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE))); /* After the last byte we have to wait for TxE too. */
+
+	/* Send STOP condition. */
+	i2c_send_stop(i2c);
+}
+
+void stts75_write_temp_hyst(u32 i2c, u8 sensor, u16 temp_hyst)
+{
+	u32 reg32;
+
+	/* Send START condition. */
+	i2c_send_start(i2c);
+
+	/* Waiting for START is send and therefore switched to master mode. */
+	while (!((I2C_SR1(i2c) & I2C_SR1_SB)
+		& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
+
+	/* Say to what address we want to talk to. */
+	i2c_send_7bit_address(i2c, sensor, I2C_WRITE);
+
+	/* Waiting for address is transferred. */
+	while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
+
+	/* Cleaning ADDR condition sequence. */
+	reg32 = I2C_SR2(i2c);
+
+	/* Sending the data. */
+	i2c_send_data(i2c, 0x2); /* TemperatureHysteresis register */
+	while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
+	i2c_send_data(i2c, (u8)(temp_hyst >> 8)); /* MSB */
+	while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
+	i2c_send_data(i2c, (u8)(temp_hyst & 0xff00)); /* LSB  */
+	while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE))); /* After the last byte we have to wait for TxE too. */
+
+	/* Send STOP condition. */
+	i2c_send_stop(i2c);
+}
+
+u16 stts75_read_temperature(u32 i2c, u8 sensor)
+{
+	u32 reg32;
+	u16 temperature;
+
+	/* Send START condition. */
+	i2c_send_start(i2c);
+
+	/* Waiting for START is send and switched to master mode. */
+	while (!((I2C_SR1(i2c) & I2C_SR1_SB)
+		& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
+
+	/* Say to what address we want to talk to. */
+	/* Yes, WRITE is correct - for selecting register in STTS75. */
+	i2c_send_7bit_address(i2c, sensor, I2C_WRITE);
+
+	/* Waiting for address is transferred. */
+	while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
+
+	/* Cleaning ADDR condition sequence. */
+	reg32 = I2C_SR2(i2c);
+
+	i2c_send_data(i2c, 0x0); /* temperature register */
+	while (!(I2C_SR1(i2c) & (I2C_SR1_BTF|I2C_SR1_TxE)));
+
+	/*
+	 * Now we transferred that we want to ACCESS the temperature register.
+	 * Now we send another START condition (repeated START) and then
+	 * transfer the destination but with flag READ.
+	 */
+
+	/* Send START condition. */
+	i2c_send_start(i2c);
+
+	/* Waiting for START is send and switched to master mode. */
+	while (!((I2C_SR1(i2c) & I2C_SR1_SB)
+		& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
+
+	/* Say to what address we want to talk to. */
+	i2c_send_7bit_address(i2c, sensor, I2C_READ); 
+	
+	/* 2-byte receive is a special case. See datasheet POS bit. */
+	I2C_CR1(i2c) |= (I2C_CR1_POS | I2C_CR1_ACK);
+
+	/* Waiting for address is transferred. */
+	while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
+
+	/* Cleaning ADDR condition sequence. */
+	reg32 = I2C_SR2(i2c);
+
+	/* Cleaning I2C_SR1_ACK. */
+	I2C_CR1(i2c) &= ~ I2C_CR1_ACK;
+
+	/* Now the slave should begin to send us the first byte. Await BTF. */
+	while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
+	temperature = (u16)(I2C_DR(i2c) << 8); /* MSB */
+
+	/*
+	 * Yes they mean it: we have to generate the STOP condition before
+	 * saving the 1st byte.
+	 */
+	I2C_CR1(i2c) |= I2C_CR1_STOP;
+
+	temperature |= I2C_DR(i2c); /* LSB */
+
+	/* Original state. */
+	I2C_CR1(i2c) &= ~I2C_CR1_POS;
+
+	return temperature;
+}
--- a/examples/stm32f1/other/i2c_stts75_sensor/stts75.h
+++ b/examples/stm32f1/other/i2c_stts75_sensor/stts75.h
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef STTS75_H
+#define STTS75_H
+
+#include <stdint.h>
+
+#define STTS75_SENSOR0		0x48
+#define STTS75_SENSOR1		0x49
+#define STTS75_SENSOR2		0x4a
+#define STTS75_SENSOR3		0x4b
+#define STTS75_SENSOR4		0x4c
+#define STTS75_SENSOR5		0x4d
+#define STTS75_SENSOR6		0x4e
+#define STTS75_SENSOR7		0x4f
+
+void stts75_write_config(u32 i2c, u8 sensor);
+void stts75_write_temp_os(u32 i2c, u8 sensor,  u16 temp_os);
+void stts75_write_temp_hyst(u32 i2c, u8 sensor, u16 temp_hyst);
+u16 stts75_read_temperature(u32 i2c, u8 sensor);
+
+#endif
--- a/examples/stm32f1/other/rtc/Makefile
+++ b/examples/stm32f1/other/rtc/Makefile
@@ -0,0 +1,23 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = rtc
+
+include ../../Makefile.include
+
--- a/examples/stm32f1/other/rtc/README
+++ b/examples/stm32f1/other/rtc/README
@@ -0,0 +1,6 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This is a small RTC example project.
+
--- a/examples/stm32f1/other/rtc/rtc.c
+++ b/examples/stm32f1/other/rtc/rtc.c
@@ -0,0 +1,116 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Lord James <lordjames@y7mail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+#include <libopencm3/stm32/rtc.h>
+#include <libopencm3/stm32/pwr.h>
+#include <libopencm3/stm32/nvic.h>
+
+void clock_setup(void)
+{
+	rcc_clock_setup_in_hse_8mhz_out_72mhz();
+
+	/* Enable GPIOC clock. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
+
+	/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_USART1EN);
+}
+
+void usart_setup(void)
+{
+	/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+                      GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
+
+	/* Setup UART parameters. */
+	usart_set_baudrate(USART1, 38400);
+	usart_set_databits(USART1, 8);
+	usart_set_stopbits(USART1, USART_STOPBITS_1);
+	usart_set_mode(USART1, USART_MODE_TX);
+	usart_set_parity(USART1, USART_PARITY_NONE);
+	usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+
+	/* Finally enable the USART. */
+	usart_enable(USART1);
+}
+
+void gpio_setup(void)
+{
+	/* Set GPIO12 (in GPIO port C) to 'output push-pull'. */
+	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
+		      GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
+}
+
+void nvic_setup(void)
+{
+	/* Without this the RTC interrupt routine will never be called. */
+	nvic_enable_irq(NVIC_RTC_IRQ);
+	nvic_set_priority(NVIC_RTC_IRQ, 1);
+}
+
+void rtc_isr(void)
+{
+	volatile u32 j = 0, c = 0;
+
+	/* The interrupt flag isn't cleared by hardware, we have to do it. */
+	rtc_clear_flag(RTC_SEC); 
+
+	/* Visual output. */
+	gpio_toggle(GPIOC, GPIO12);
+
+	c = rtc_get_counter_val();
+
+	/* Display the current counter value in binary via USART1. */
+	for (j = 0; j < 32; j++) {
+		if ((c & (0x80000000 >> j)) != 0) {
+			usart_send(USART1, '1');
+		} else {
+			usart_send(USART1, '0');
+		}
+	}
+	usart_send(USART1, '\n');
+}
+
+int main(void)
+{
+	clock_setup();
+	gpio_setup();
+	usart_setup();
+
+	/*
+	 * If the RTC is pre-configured just allow access, don't reconfigure.
+	 * Otherwise enable it with the LSE as clock source and 0x7fff as
+	 * prescale value.
+	 */
+	rtc_auto_awake(LSE, 0x7fff);
+
+	/* Setup the RTC interrupt. */
+	nvic_setup();
+
+	/* Enable the RTC interrupt to occur off the SEC flag. */
+	rtc_interrupt_enable(RTC_SEC);
+
+	while(1);
+
+	return 0;
+}
--- a/examples/stm32f1/other/rtc/rtc.ld
+++ b/examples/stm32f1/other/rtc/rtc.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for Olimex STM32-H103 (STM32F103RBT6, 128K flash, 20K RAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+
--- a/examples/stm32f1/other/systick/Makefile
+++ b/examples/stm32f1/other/systick/Makefile
@@ -0,0 +1,23 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = systick
+
+include ../../Makefile.include
+
--- a/examples/stm32f1/other/systick/README
+++ b/examples/stm32f1/other/systick/README
@@ -0,0 +1,7 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This example program blinks a LED on PortB Pin 6. 1 second on / 1 second off.
+Blinking is done via the systick timer interrupt.
+
--- a/examples/stm32f1/other/systick/systick.c
+++ b/examples/stm32f1/other/systick/systick.c
@@ -0,0 +1,75 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/flash.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/nvic.h>
+#include <libopencm3/stm32/systick.h>
+
+u32 temp32;
+
+void gpio_setup(void)
+{
+	/* Enable GPIOB clock. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
+
+	/* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
+}
+
+void sys_tick_handler()
+{
+	temp32++;
+	
+	/* we call this handler every 1ms so 1000ms = 1s on/off */
+	if (temp32 == 1000) {
+		gpio_toggle(GPIOB, GPIO6); /* LED2 on/off */
+		temp32 = 0;
+	}
+}
+
+int main(void)
+{
+        rcc_clock_setup_in_hse_16mhz_out_72mhz();
+	gpio_setup();
+
+	gpio_clear(GPIOB, GPIO7);	/* LED1 on */
+	gpio_set(GPIOB, GPIO6);		/* LED2 off */
+	
+	temp32 = 0;
+
+	/* 72MHz / 8 => 9000000 counts per second */
+	systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8); 
+
+	/* 9000000/9000 = 1000 overflows per second - every 1ms one interrupt */
+	systick_set_reload(9000);
+
+	systick_interrupt_enable();
+
+	/* start counting */
+	systick_counter_enable();
+	
+	while(1); /* Halt. */
+
+	return 0;
+}
--- a/examples/stm32f1/other/systick/systick.ld
+++ b/examples/stm32f1/other/systick/systick.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for an STM32F103RBT6 board (128K flash, 20K RAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+
--- a/examples/stm32f1/other/timer_interrupt/Makefile
+++ b/examples/stm32f1/other/timer_interrupt/Makefile
@@ -0,0 +1,23 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = timer
+
+include ../../Makefile.include
+
--- a/examples/stm32f1/other/timer_interrupt/README
+++ b/examples/stm32f1/other/timer_interrupt/README
@@ -0,0 +1,7 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This example program blinks a LED on PortB Pin 6. 1 second on / 1 second off.
+Blinking is made only with the timer interrupt of the TIM2 timer.
+
--- a/examples/stm32f1/other/timer_interrupt/timer.c
+++ b/examples/stm32f1/other/timer_interrupt/timer.c
@@ -0,0 +1,85 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/flash.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/timer.h>
+#include <libopencm3/stm32/nvic.h>
+
+void gpio_setup(void)
+{
+	/* Enable GPIOB clock. */
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
+
+	/* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
+	              GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
+}
+
+void nvic_setup()
+{
+	/* without this the timer interrupt routine will never be called */
+	nvic_enable_irq(NVIC_TIM2_IRQ);
+	nvic_set_priority(NVIC_TIM2_IRQ, 1);	
+}
+
+void tim2_isr()
+{
+	/* LED2 on/off */
+	gpio_toggle(GPIOB, GPIO6);
+
+	/* clear interrrupt flag */
+	TIM_SR(TIM2) &= ~TIM_SR_UIF;
+}
+
+int main(void)
+{
+        rcc_clock_setup_in_hse_16mhz_out_72mhz();
+	gpio_setup();
+	nvic_setup();
+
+	gpio_clear(GPIOB, GPIO7);	/* LED1 on */
+	gpio_set(GPIOB, GPIO6);		/* LED2 off */
+	
+	rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_TIM2EN);
+
+	/* the goal is to let the LED2 glow for a second and then be off for a second */	
+
+	/* Set timer start value */
+	TIM_CNT(TIM2) = 1;
+
+	/* Set timer prescaler. 72MHz/1440 => 50000 counts per second */
+	TIM_PSC(TIM2) = 1440;
+
+	/* End timer value. If this value is reached an interrupt is generated */
+	TIM_ARR(TIM2) = 50000;
+
+	/* Update interrupt enable */
+	TIM_DIER(TIM2) |= TIM_DIER_UIE;
+
+	/* Start timer */
+	TIM_CR1(TIM2) |= TIM_CR1_CEN;
+
+	while(1); /* Halt. */
+
+	return 0;
+}
--- a/examples/stm32f1/other/timer_interrupt/timer.ld
+++ b/examples/stm32f1/other/timer_interrupt/timer.ld
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for an STM32F103RBT6 board (128K flash, 20K RAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+
--- a/examples/stm32f1/other/usb_cdcacm/Makefile
+++ b/examples/stm32f1/other/usb_cdcacm/Makefile
@@ -0,0 +1,23 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = cdcacm
+
+include ../../Makefile.include
+
--- a/examples/stm32f1/other/usb_cdcacm/README
+++ b/examples/stm32f1/other/usb_cdcacm/README
@@ -0,0 +1,7 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This example implements a USB CDC-ACM device (aka Virtual Serial Port)
+to demonstrate the use of the USB device stack.
+
--- a/examples/stm32f1/other/usb_cdcacm/cdcacm.c
+++ b/examples/stm32f1/other/usb_cdcacm/cdcacm.c
@@ -0,0 +1,245 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/usb/usbd.h>
+#include <libopencm3/usb/cdc.h>
+
+static const struct usb_device_descriptor dev = {
+        .bLength = USB_DT_DEVICE_SIZE,
+        .bDescriptorType = USB_DT_DEVICE,
+        .bcdUSB = 0x0200,
+        .bDeviceClass = USB_CLASS_CDC,
+        .bDeviceSubClass = 0,
+        .bDeviceProtocol = 0,
+        .bMaxPacketSize0 = 64,
+        .idVendor = 0x0483,
+        .idProduct = 0x5740,
+        .bcdDevice = 0x0200,
+        .iManufacturer = 1,
+        .iProduct = 2,
+        .iSerialNumber = 3,
+        .bNumConfigurations = 1,
+};
+
+/* This notification endpoint isn't implemented. According to CDC spec its 
+ * optional, but its absence causes a NULL pointer dereference in Linux cdc_acm 
+ * driver. */
+static const struct usb_endpoint_descriptor comm_endp[] = {{
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 0x83,
+	.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
+	.wMaxPacketSize = 16,
+	.bInterval = 255,
+}};
+
+static const struct usb_endpoint_descriptor data_endp[] = {{
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 0x01,
+	.bmAttributes = USB_ENDPOINT_ATTR_BULK,
+	.wMaxPacketSize = 64,
+	.bInterval = 1,
+}, {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 0x82,
+	.bmAttributes = USB_ENDPOINT_ATTR_BULK,
+	.wMaxPacketSize = 64,
+	.bInterval = 1,
+}};
+
+static const struct {
+	struct usb_cdc_header_descriptor header;
+	struct usb_cdc_call_management_descriptor call_mgmt;
+	struct usb_cdc_acm_descriptor acm;
+	struct usb_cdc_union_descriptor cdc_union;
+} __attribute__((packed)) cdcacm_functional_descriptors = {
+	.header = {
+		.bFunctionLength = sizeof(struct usb_cdc_header_descriptor),
+		.bDescriptorType = CS_INTERFACE,
+		.bDescriptorSubtype = USB_CDC_TYPE_HEADER,
+		.bcdCDC = 0x0110,
+	},
+	.call_mgmt = {
+		.bFunctionLength = 
+			sizeof(struct usb_cdc_call_management_descriptor),
+		.bDescriptorType = CS_INTERFACE,
+		.bDescriptorSubtype = USB_CDC_TYPE_CALL_MANAGEMENT,
+		.bmCapabilities = 0,
+		.bDataInterface = 1,
+	},
+	.acm = {
+		.bFunctionLength = sizeof(struct usb_cdc_acm_descriptor),
+		.bDescriptorType = CS_INTERFACE,
+		.bDescriptorSubtype = USB_CDC_TYPE_ACM,
+		.bmCapabilities = 0,
+	},
+	.cdc_union = {
+		.bFunctionLength = sizeof(struct usb_cdc_union_descriptor),
+		.bDescriptorType = CS_INTERFACE,
+		.bDescriptorSubtype = USB_CDC_TYPE_UNION,
+		.bControlInterface = 0,
+		.bSubordinateInterface0 = 1, 
+	 }
+};
+
+static const struct usb_interface_descriptor comm_iface[] = {{
+	.bLength = USB_DT_INTERFACE_SIZE,
+	.bDescriptorType = USB_DT_INTERFACE,
+	.bInterfaceNumber = 0,
+	.bAlternateSetting = 0,
+	.bNumEndpoints = 1,
+	.bInterfaceClass = USB_CLASS_CDC,
+	.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
+	.bInterfaceProtocol = USB_CDC_PROTOCOL_AT,
+	.iInterface = 0,
+
+	.endpoint = comm_endp,
+
+	.extra = &cdcacm_functional_descriptors,
+	.extralen = sizeof(cdcacm_functional_descriptors)
+}};
+
+static const struct usb_interface_descriptor data_iface[] = {{
+	.bLength = USB_DT_INTERFACE_SIZE,
+	.bDescriptorType = USB_DT_INTERFACE,
+	.bInterfaceNumber = 1,
+	.bAlternateSetting = 0,
+	.bNumEndpoints = 2,
+	.bInterfaceClass = USB_CLASS_DATA,
+	.bInterfaceSubClass = 0,
+	.bInterfaceProtocol = 0,
+	.iInterface = 0,
+
+	.endpoint = data_endp,
+}};
+
+static const struct usb_interface ifaces[] = {{
+	.num_altsetting = 1,
+	.altsetting = comm_iface,
+}, {
+	.num_altsetting = 1,
+	.altsetting = data_iface,
+}};
+
+static const struct usb_config_descriptor config = {
+	.bLength = USB_DT_CONFIGURATION_SIZE,
+	.bDescriptorType = USB_DT_CONFIGURATION,
+	.wTotalLength = 0,
+	.bNumInterfaces = 2,
+	.bConfigurationValue = 1,
+	.iConfiguration = 0,
+	.bmAttributes = 0x80,
+	.bMaxPower = 0x32,
+
+	.interface = ifaces,
+};
+
+static const char *usb_strings[] = {
+	"x",
+	"Black Sphere Technologies",
+	"CDC-ACM Demo",
+	"DEMO"
+};
+
+static int cdcacm_control_request(struct usb_setup_data *req, u8 **buf, 
+		u16 *len, void (**complete)(struct usb_setup_data *req))
+{
+	(void)complete;
+	(void)buf;
+
+	switch(req->bRequest) {
+	case USB_CDC_REQ_SET_CONTROL_LINE_STATE: {
+		/* This Linux cdc_acm driver requires this to be implemented 
+		 * even though it's optional in the CDC spec, and we don't 
+		 * advertise it in the ACM functional descriptor. */
+		char buf[10];
+		struct usb_cdc_notification *notif = (void*)buf;
+
+		/* We echo signals back to host as notification */
+		notif->bmRequestType = 0xA1;
+		notif->bNotification = USB_CDC_NOTIFY_SERIAL_STATE;
+		notif->wValue = 0;
+		notif->wIndex = 0;
+		notif->wLength = 2;
+		buf[8] = req->wValue & 3;
+		buf[9] = 0;
+		//usbd_ep_write_packet(0x83, buf, 10);
+		return 1;
+		}
+	case USB_CDC_REQ_SET_LINE_CODING: 
+		if(*len < sizeof(struct usb_cdc_line_coding)) 
+			return 0;
+
+		return 1;
+	}
+	return 0;
+}
+
+static void cdcacm_data_rx_cb(u8 ep)
+{
+	(void)ep;
+
+	char buf[64];
+	int len = usbd_ep_read_packet(0x01, buf, 64);
+	if(len) { 
+		usbd_ep_write_packet(0x82, buf, len);
+		buf[len] = 0;
+	}
+}
+
+static void cdcacm_set_config(u16 wValue)
+{
+	(void)wValue;
+
+	usbd_ep_setup(0x01, USB_ENDPOINT_ATTR_BULK, 64, cdcacm_data_rx_cb);
+	usbd_ep_setup(0x82, USB_ENDPOINT_ATTR_BULK, 64, NULL);
+	usbd_ep_setup(0x83, USB_ENDPOINT_ATTR_INTERRUPT, 16, NULL);
+
+	usbd_register_control_callback(
+				USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE, 
+				USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
+				cdcacm_control_request);
+}
+
+int main(void)
+{
+        rcc_clock_setup_in_hsi_out_48mhz();
+
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN);
+
+	AFIO_MAPR |= AFIO_MAPR_SWJ_CFG_JTAG_OFF_SW_ON;
+
+	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, 0, GPIO15);
+
+	usbd_init(&stm32f103_usb_driver, &dev, &config, usb_strings);
+	usbd_register_set_config_callback(cdcacm_set_config);
+
+	gpio_set(GPIOA, GPIO15);
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, 
+			GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
+
+	while (1) 
+		usbd_poll();
+}
--- a/examples/stm32f1/other/usb_cdcacm/cdcacm.ld
+++ b/examples/stm32f1/other/usb_cdcacm/cdcacm.ld
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 64K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+
--- a/examples/stm32f1/other/usb_dfu/Makefile
+++ b/examples/stm32f1/other/usb_dfu/Makefile
@@ -0,0 +1,23 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = usbdfu
+
+include ../../Makefile.include
+
--- a/examples/stm32f1/other/usb_dfu/README
+++ b/examples/stm32f1/other/usb_dfu/README
@@ -0,0 +1,7 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This example implements a USB Device Firmware Upgrade (DFU) bootloader
+to demonstrate the use of the USB device stack.
+
--- a/examples/stm32f1/other/usb_dfu/usbdfu.c
+++ b/examples/stm32f1/other/usb_dfu/usbdfu.c
@@ -0,0 +1,270 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <string.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/flash.h>
+#include <libopencm3/stm32/scb.h>
+#include <libopencm3/usb/usbd.h>
+#include <libopencm3/usb/dfu.h>
+
+#define APP_ADDRESS	0x08002000
+
+/* Commands sent with wBlockNum == 0 as per ST implementation. */
+#define CMD_SETADDR	0x21 
+#define CMD_ERASE	0x41 
+
+/* We need a special large control buffer for this device: */
+u8 usbd_control_buffer[1024];
+
+static enum dfu_state usbdfu_state = STATE_DFU_IDLE;
+
+static struct {
+	u8 buf[sizeof(usbd_control_buffer)];
+	u16 len;
+	u32 addr;
+	u16 blocknum;
+} prog;
+
+const struct usb_device_descriptor dev = {
+        .bLength = USB_DT_DEVICE_SIZE,
+        .bDescriptorType = USB_DT_DEVICE,
+        .bcdUSB = 0x0200,
+        .bDeviceClass = 0,
+        .bDeviceSubClass = 0,
+        .bDeviceProtocol = 0,
+        .bMaxPacketSize0 = 64,
+        .idVendor = 0x0483,
+        .idProduct = 0xDF11,
+        .bcdDevice = 0x0200,
+        .iManufacturer = 1,
+        .iProduct = 2,
+        .iSerialNumber = 3,
+        .bNumConfigurations = 1,
+};
+
+const struct usb_dfu_descriptor dfu_function = {
+	.bLength = sizeof(struct usb_dfu_descriptor),
+	.bDescriptorType = DFU_FUNCTIONAL,
+	.bmAttributes = USB_DFU_CAN_DOWNLOAD | USB_DFU_WILL_DETACH,
+	.wDetachTimeout = 255,
+	.wTransferSize = 1024,
+	.bcdDFUVersion = 0x011A,
+};
+
+const struct usb_interface_descriptor iface = {
+	.bLength = USB_DT_INTERFACE_SIZE,
+	.bDescriptorType = USB_DT_INTERFACE,
+	.bInterfaceNumber = 0,
+	.bAlternateSetting = 0,
+	.bNumEndpoints = 0,
+	.bInterfaceClass = 0xFE, /* Device Firmware Upgrade */
+	.bInterfaceSubClass = 1,
+	.bInterfaceProtocol = 2,
+
+	/* The ST Microelectronics DfuSe application needs this string. 
+	 * The format isn't documented... */
+	.iInterface = 4,
+
+	.extra = &dfu_function,
+	.extralen = sizeof(dfu_function),
+};
+
+const struct usb_interface ifaces[] = {{
+	.num_altsetting = 1,
+	.altsetting = &iface,
+}};
+
+const struct usb_config_descriptor config = {
+	.bLength = USB_DT_CONFIGURATION_SIZE,
+	.bDescriptorType = USB_DT_CONFIGURATION,
+	.wTotalLength = 0,
+	.bNumInterfaces = 1,
+	.bConfigurationValue = 1,
+	.iConfiguration = 0,
+	.bmAttributes = 0xC0,
+	.bMaxPower = 0x32,
+
+	.interface = ifaces,
+};
+
+static const char *usb_strings[] = {
+	"x",
+	"Black Sphere Technologies",
+	"DFU Demo",
+	"DEMO",
+	/* This string is used by ST Microelectronics' DfuSe utility */
+	"@Internal Flash   /0x08000000/8*001Ka,56*001Kg"
+};
+
+static u8 usbdfu_getstatus(u32 *bwPollTimeout)
+{
+	switch(usbdfu_state) {
+	case STATE_DFU_DNLOAD_SYNC:
+		usbdfu_state = STATE_DFU_DNBUSY; 
+		*bwPollTimeout = 100;
+		return DFU_STATUS_OK;
+
+	case STATE_DFU_MANIFEST_SYNC:
+		/* Device will reset when read is complete */
+		usbdfu_state = STATE_DFU_MANIFEST;
+		return DFU_STATUS_OK;
+
+	default:
+		return DFU_STATUS_OK;
+	}
+}
+
+static void usbdfu_getstatus_complete(struct usb_setup_data *req)
+{
+	int i;
+	(void)req;
+
+	switch(usbdfu_state) {
+	case STATE_DFU_DNBUSY:
+
+		flash_unlock();
+		if(prog.blocknum == 0) {
+			switch(prog.buf[0]) {
+			case CMD_ERASE:
+				flash_erase_page(*(u32*)(prog.buf+1));
+			case CMD_SETADDR:
+				prog.addr = *(u32*)(prog.buf+1);
+			}
+		} else {
+			u32 baseaddr = prog.addr + 
+				((prog.blocknum - 2) * 
+					dfu_function.wTransferSize);
+			for(i = 0; i < prog.len; i += 2) 
+				flash_program_half_word(baseaddr + i, 
+						*(u16*)(prog.buf+i));
+		}
+		flash_lock();
+
+		/* We jump straight to dfuDNLOAD-IDLE, 
+		 * skipping dfuDNLOAD-SYNC 
+		 */
+		usbdfu_state = STATE_DFU_DNLOAD_IDLE;
+		return;
+
+	case STATE_DFU_MANIFEST:
+		/* USB device must detach, we just reset... */
+		scb_reset_system();
+		return; /* Will never return */
+	default:
+		return;
+	}
+}
+
+static int usbdfu_control_request(struct usb_setup_data *req, u8 **buf, 
+		u16 *len, void (**complete)(struct usb_setup_data *req))
+{
+
+	if((req->bmRequestType & 0x7F) != 0x21) 
+		return 0; /* Only accept class request */
+
+	switch(req->bRequest) {
+	case DFU_DNLOAD:
+		if((len == NULL) || (*len == 0)) {
+			usbdfu_state = STATE_DFU_MANIFEST_SYNC;
+			return 1;
+		} else {
+			/* Copy download data for use on GET_STATUS */
+			prog.blocknum = req->wValue;
+			prog.len = *len;
+			memcpy(prog.buf, *buf, *len);
+			usbdfu_state = STATE_DFU_DNLOAD_SYNC;
+			return 1;
+		}
+	case DFU_CLRSTATUS:
+		/* Clear error and return to dfuIDLE */
+		if(usbdfu_state == STATE_DFU_ERROR)
+			usbdfu_state = STATE_DFU_IDLE;
+		return 1;
+	case DFU_ABORT:
+		/* Abort returns to dfuIDLE state */
+		usbdfu_state = STATE_DFU_IDLE;
+		return 1;
+	case DFU_UPLOAD:
+		/* Upload not supported for now */
+		return 0;
+	case DFU_GETSTATUS: {
+		u32 bwPollTimeout = 0; /* 24-bit integer in DFU class spec */
+
+		(*buf)[0] = usbdfu_getstatus(&bwPollTimeout);
+		(*buf)[1] = bwPollTimeout & 0xFF;
+		(*buf)[2] = (bwPollTimeout >> 8) & 0xFF;
+		(*buf)[3] = (bwPollTimeout >> 16) & 0xFF;
+		(*buf)[4] = usbdfu_state;
+		(*buf)[5] = 0;	/* iString not used here */
+		*len = 6;
+
+		*complete = usbdfu_getstatus_complete;
+
+		return 1;
+		}
+	case DFU_GETSTATE:
+		/* Return state with no state transision */
+		*buf[0] = usbdfu_state;
+		*len = 1;
+		return 1;
+	}
+
+	return 0;
+}
+
+int main(void)
+{
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
+	if(!gpio_get(GPIOA, GPIO10)) {
+		/* Boot the application if it's valid */
+		if((*(volatile u32*)APP_ADDRESS & 0x2FFE0000) == 0x20000000) {
+			/* Set vector table base address */
+			SCB_VTOR = APP_ADDRESS & 0xFFFF;
+			/* Initialise master stack pointer */
+			asm volatile ("msr msp, %0"::"g"
+					(*(volatile u32*)APP_ADDRESS));
+			/* Jump to application */
+			(*(void(**)())(APP_ADDRESS + 4))();
+		}
+	}
+
+        rcc_clock_setup_in_hsi_out_48mhz();
+
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN);
+
+	AFIO_MAPR |= AFIO_MAPR_SWJ_CFG_JTAG_OFF_SW_ON;
+	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, 0, GPIO15);
+
+	usbd_init(&stm32f103_usb_driver, &dev, &config, usb_strings);
+	usbd_set_control_buffer_size(sizeof(usbd_control_buffer));
+	usbd_register_control_callback(
+				USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
+				USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
+				usbdfu_control_request);
+
+	gpio_set(GPIOA, GPIO15);
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, 
+			GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
+
+	while (1) 
+		usbd_poll();
+}
--- a/examples/stm32f1/other/usb_dfu/usbdfu.ld
+++ b/examples/stm32f1/other/usb_dfu/usbdfu.ld
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 8K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 4K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+
--- a/examples/stm32f1/other/usb_hid/Makefile
+++ b/examples/stm32f1/other/usb_hid/Makefile
@@ -0,0 +1,23 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = usbhid
+
+include ../../Makefile.include
+
--- a/examples/stm32f1/other/usb_hid/README
+++ b/examples/stm32f1/other/usb_hid/README
@@ -0,0 +1,7 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This example implements a USB Human Interface Device (HID)
+to demonstrate the use of the USB device stack.
+
--- a/examples/stm32f1/other/usb_hid/usbhid.c
+++ b/examples/stm32f1/other/usb_hid/usbhid.c
@@ -0,0 +1,272 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/systick.h>
+#include <libopencm3/usb/usbd.h>
+#include <libopencm3/usb/hid.h>
+
+/* Define this to include the DFU APP interface. */
+#define INCLUDE_DFU_INTERFACE
+
+#ifdef INCLUDE_DFU_INTERFACE
+#include <libopencm3/stm32/scb.h>
+#include <libopencm3/usb/dfu.h>
+#endif
+
+const struct usb_device_descriptor dev = {
+        .bLength = USB_DT_DEVICE_SIZE,
+        .bDescriptorType = USB_DT_DEVICE,
+        .bcdUSB = 0x0200,
+        .bDeviceClass = 0,
+        .bDeviceSubClass = 0,
+        .bDeviceProtocol = 0,
+        .bMaxPacketSize0 = 64,
+        .idVendor = 0x0483,
+        .idProduct = 0x5710,
+        .bcdDevice = 0x0200,
+        .iManufacturer = 1,
+        .iProduct = 2,
+        .iSerialNumber = 3,
+        .bNumConfigurations = 1,
+};
+
+/* I have no idea what this means.  I haven't read the HID spec. */
+static const u8 hid_report_descriptor[] = {
+	0x05, 0x01, 0x09, 0x02, 0xA1, 0x01, 0x09, 0x01,
+	0xA1, 0x00, 0x05, 0x09, 0x19, 0x01, 0x29, 0x03,
+	0x15, 0x00, 0x25, 0x01, 0x95, 0x03, 0x75, 0x01,
+	0x81, 0x02, 0x95, 0x01, 0x75, 0x05, 0x81, 0x01,
+	0x05, 0x01, 0x09, 0x30, 0x09, 0x31, 0x09, 0x38,
+	0x15, 0x81, 0x25, 0x7F, 0x75, 0x08, 0x95, 0x03,
+	0x81, 0x06, 0xC0, 0x09, 0x3c, 0x05, 0xff, 0x09,
+	0x01, 0x15, 0x00, 0x25, 0x01, 0x75, 0x01, 0x95,
+	0x02, 0xb1, 0x22, 0x75, 0x06, 0x95, 0x01, 0xb1,
+	0x01, 0xc0
+};
+
+static const struct {
+	struct usb_hid_descriptor hid_descriptor;
+	struct {
+		u8 bReportDescriptorType;
+		u16 wDescriptorLength;
+	} __attribute__((packed)) hid_report;
+} __attribute__((packed)) hid_function = {
+	.hid_descriptor = {
+		.bLength = sizeof(hid_function),
+		.bDescriptorType = USB_DT_HID,
+		.bcdHID = 0x0100,
+		.bCountryCode = 0,
+		.bNumDescriptors = 1,
+	},
+	.hid_report = {
+		.bReportDescriptorType = USB_DT_REPORT,
+		.wDescriptorLength = sizeof(hid_report_descriptor),
+	}
+};
+
+const struct usb_endpoint_descriptor hid_endpoint = {
+	.bLength = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType = USB_DT_ENDPOINT,
+	.bEndpointAddress = 0x81,
+	.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
+	.wMaxPacketSize = 4,
+	.bInterval = 0x20,
+};
+
+const struct usb_interface_descriptor hid_iface = {
+	.bLength = USB_DT_INTERFACE_SIZE,
+	.bDescriptorType = USB_DT_INTERFACE,
+	.bInterfaceNumber = 0,
+	.bAlternateSetting = 0,
+	.bNumEndpoints = 1,
+	.bInterfaceClass = USB_CLASS_HID,
+	.bInterfaceSubClass = 1, /* boot */
+	.bInterfaceProtocol = 2, /* mouse */
+	.iInterface = 0,
+
+	.endpoint = &hid_endpoint,
+
+	.extra = &hid_function,
+	.extralen = sizeof(hid_function),
+};
+
+#ifdef INCLUDE_DFU_INTERFACE
+const struct usb_dfu_descriptor dfu_function = {
+	.bLength = sizeof(struct usb_dfu_descriptor),
+	.bDescriptorType = DFU_FUNCTIONAL,
+	.bmAttributes = USB_DFU_CAN_DOWNLOAD | USB_DFU_WILL_DETACH,
+	.wDetachTimeout = 255,
+	.wTransferSize = 1024,
+	.bcdDFUVersion = 0x011A,
+};
+
+const struct usb_interface_descriptor dfu_iface = {
+	.bLength = USB_DT_INTERFACE_SIZE,
+	.bDescriptorType = USB_DT_INTERFACE,
+	.bInterfaceNumber = 1,
+	.bAlternateSetting = 0,
+	.bNumEndpoints = 0,
+	.bInterfaceClass = 0xFE,
+	.bInterfaceSubClass = 1,
+	.bInterfaceProtocol = 1,
+	.iInterface = 0,
+
+	.extra = &dfu_function,
+	.extralen = sizeof(dfu_function),
+};
+#endif
+
+const struct usb_interface ifaces[] = {{
+	.num_altsetting = 1,
+	.altsetting = &hid_iface,
+#ifdef INCLUDE_DFU_INTERFACE
+}, {
+	.num_altsetting = 1,
+	.altsetting = &dfu_iface,
+#endif
+}};
+
+const struct usb_config_descriptor config = {
+	.bLength = USB_DT_CONFIGURATION_SIZE,
+	.bDescriptorType = USB_DT_CONFIGURATION,
+	.wTotalLength = 0,
+#ifdef INCLUDE_DFU_INTERFACE
+	.bNumInterfaces = 2,
+#else
+	.bNumInterfaces = 1,
+#endif
+	.bConfigurationValue = 1,
+	.iConfiguration = 0,
+	.bmAttributes = 0xC0,
+	.bMaxPower = 0x32,
+
+	.interface = ifaces,
+};
+
+static const char *usb_strings[] = {
+	"x",
+	"Black Sphere Technologies",
+	"HID Demo",
+	"DEMO",
+};
+
+static int hid_control_request(struct usb_setup_data *req, u8 **buf, u16 *len,
+			void (**complete)(struct usb_setup_data *req))
+{
+	(void)complete;
+
+	if((req->bmRequestType != 0x81) || 
+	   (req->bRequest != USB_REQ_GET_DESCRIPTOR) ||
+	   (req->wValue != 0x2200)) 
+		return 0; 
+
+	/* Handle the HID report descriptor */
+	*buf = (u8*)hid_report_descriptor;
+	*len = sizeof(hid_report_descriptor);
+
+	return 1;
+}
+
+#ifdef INCLUDE_DFU_INTERFACE
+static void dfu_detach_complete(struct usb_setup_data *req)
+{
+	(void)req;
+
+	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, 0, GPIO15);
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, 
+			GPIO_CNF_OUTPUT_PUSHPULL, GPIO10);
+	gpio_set(GPIOA, GPIO10);
+	scb_reset_core();
+}
+
+static int dfu_control_request(struct usb_setup_data *req, u8 **buf, u16 *len,
+			void (**complete)(struct usb_setup_data *req))
+{
+	(void)buf; 
+	(void)len;
+
+	if((req->bmRequestType != 0x21) || (req->bRequest != DFU_DETACH)) 
+		return 0; /* Only accept class request */
+
+	*complete = dfu_detach_complete;
+
+	return 1;
+}
+#endif
+
+static void hid_set_config(u16 wValue)
+{
+	(void)wValue;
+
+	usbd_ep_setup(0x81, USB_ENDPOINT_ATTR_INTERRUPT, 4, NULL);
+
+	usbd_register_control_callback(
+				USB_REQ_TYPE_STANDARD | USB_REQ_TYPE_INTERFACE,
+				USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
+				hid_control_request);
+#ifdef INCLUDE_DFU_INTERFACE
+	usbd_register_control_callback(
+				USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
+				USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
+				dfu_control_request);
+#endif
+
+	systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8); 
+	systick_set_reload(100000);
+	systick_interrupt_enable();
+	systick_counter_enable();
+}
+
+int main(void)
+{
+        rcc_clock_setup_in_hsi_out_48mhz();
+
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
+	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN);
+
+	AFIO_MAPR |= AFIO_MAPR_SWJ_CFG_JTAG_OFF_SW_ON;
+	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, 0, GPIO15);
+
+	usbd_init(&stm32f103_usb_driver, &dev, &config, usb_strings);
+	usbd_register_set_config_callback(hid_set_config);
+
+	gpio_set(GPIOA, GPIO15);
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, 
+			GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
+
+	while (1) 
+		usbd_poll();
+}
+
+void sys_tick_handler(void)
+{
+	static int x = 0;
+	static int dir = 1;
+	u8 buf[4] = {0, 0, 0, 0};
+
+	buf[1] = dir;
+	x += dir;
+	if(x > 30) dir = -dir;
+	if(x < -30) dir = -dir;
+
+	usbd_ep_write_packet(0x81, buf, 4);
+}
--- a/examples/stm32f1/other/usb_hid/usbhid.ld
+++ b/examples/stm32f1/other/usb_hid/usbhid.ld
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 64K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+