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Piotr Esden-Tempski
2013-04-19 17:19:32 -07:00
commit 9d5526f773
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examples/stm32/f1/stm32vl-discovery/adc-dac-printf/Makefile
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
##
## This library is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This library 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 Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this library. If not, see <http://www.gnu.org/licenses/>.
##
BINARY = adc-dac-printf
LDSCRIPT = ../../../../../lib/stm32/f1/stm32f100xb.ld
include ../../Makefile.include
examples/stm32/f1/stm32vl-discovery/adc-dac-printf/README
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Console on PA2 (tx only) 115200@8n1
* Prints the ADC value on PA0 (adc channel 0) on the console
* Echos half that ADC value out to DAC channel 2 on PA5
* Prints the ADC value of PA1 (adc channel 1) to the console.
Recommended wiring:
* pot or any resistor ladder to PA0
* jumper from PA5 to PA1
example output:
...
tick: 228: adc0= 3950, target adc1=1975, adc1=1979
tick: 229: adc0= 3949, target adc1=1974, adc1=1978
tick: 230: adc0= 3950, target adc1=1975, adc1=1979
tick: 231: adc0= 3949, target adc1=1974, adc1=1978
...
examples/stm32/f1/stm32vl-discovery/adc-dac-printf/adc-dac-printf.c
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2013 Karl Palsson <karlp@tweak.net.au>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/stm32/dac.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/usart.h>
#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/adc.h>
#define LED_DISCOVERY_USER_PORT GPIOC
#define LED_DISCOVERY_USER_PIN GPIO8
#define USART_CONSOLE USART2
int _write(int file, char *ptr, int len);
static void clock_setup(void)
{
rcc_clock_setup_in_hsi_out_24mhz();
/* Enable clocks for USART2 and DAC*/
rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_DACEN);
/* and the ADC and IO ports */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN);
}
static void usart_setup(void)
{
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART2_TX);
usart_set_baudrate(USART_CONSOLE, 115200);
usart_set_databits(USART_CONSOLE, 8);
usart_set_stopbits(USART_CONSOLE, USART_STOPBITS_1);
usart_set_mode(USART_CONSOLE, USART_MODE_TX);
usart_set_parity(USART_CONSOLE, USART_PARITY_NONE);
usart_set_flow_control(USART_CONSOLE, USART_FLOWCONTROL_NONE);
/* Finally enable the USART. */
usart_enable(USART_CONSOLE);
}
/**
* Use USART_CONSOLE as a console.
* This is a syscall for newlib
* @param file
* @param ptr
* @param len
* @return
*/
int _write(int file, char *ptr, int len)
{
int i;
if (file == STDOUT_FILENO || file == STDERR_FILENO) {
for (i = 0; i < len; i++) {
if (ptr[i] == '\n') {
usart_send_blocking(USART_CONSOLE, '\r');
}
usart_send_blocking(USART_CONSOLE, ptr[i]);
}
return i;
}
errno = EIO;
return -1;
}
static void adc_setup(void)
{
gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_ANALOG, GPIO0);
gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_ANALOG, GPIO1);
/* Make sure the ADC 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_disable_external_trigger_regular(ADC1);
adc_set_right_aligned(ADC1);
adc_set_sample_time_on_all_channels(ADC1, ADC_SMPR_SMP_28DOT5CYC);
adc_power_on(ADC1);
/* Wait for ADC starting up. */
int i;
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("nop");
adc_reset_calibration(ADC1);
adc_calibration(ADC1);
}
static void dac_setup(void)
{
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO5);
dac_disable(CHANNEL_2);
dac_disable_waveform_generation(CHANNEL_2);
dac_enable(CHANNEL_2);
dac_set_trigger_source(DAC_CR_TSEL2_SW);
}
static u16 read_adc_naiive(u8 channel)
{
u8 channel_array[16];
channel_array[0] = channel;
adc_set_regular_sequence(ADC1, 1, channel_array);
adc_start_conversion_direct(ADC1);
while (!adc_eoc(ADC1));
u16 reg16 = adc_read_regular(ADC1);
return reg16;
}
int main(void)
{
int i;
int j = 0;
clock_setup();
usart_setup();
printf("hi guys!\n");
adc_setup();
dac_setup();
gpio_set_mode(LED_DISCOVERY_USER_PORT, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, LED_DISCOVERY_USER_PIN);
while (1) {
u16 input_adc0 = read_adc_naiive(0);
u16 target = input_adc0 / 2;
dac_load_data_buffer_single(target, RIGHT12, CHANNEL_2);
dac_software_trigger(CHANNEL_2);
u16 input_adc1 = read_adc_naiive(1);
printf("tick: %d: adc0= %u, target adc1=%d, adc1=%d\n",
j++, input_adc0, target, input_adc1);
gpio_toggle(LED_DISCOVERY_USER_PORT, LED_DISCOVERY_USER_PIN); /* LED on/off */
for (i = 0; i < 1000000; i++) /* Wait a bit. */
__asm__("NOP");
}
return 0;
}
examples/stm32/f1/stm32vl-discovery/button/Makefile
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
##
## This library is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This library 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 Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this library. If not, see <http://www.gnu.org/licenses/>.
##
BINARY = button
LDSCRIPT = ../stm32vl-discovery.ld
include ../../Makefile.include
examples/stm32/f1/stm32vl-discovery/button/README
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This example blinks the green LED on the ST STM32VLDISCOVERY eval board.
When you press the 'USER' button, the blinking is slower.
examples/stm32/f1/stm32vl-discovery/button/button.c
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>,
* Copyright (C) 2010 Piotr Esden-Tempski <piotr@esden.net>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/gpio.h>
u16 exti_line_state;
/* Set STM32 to 24 MHz. */
static void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_24mhz();
}
static void gpio_setup(void)
{
/* Enable GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
/* Set GPIO9 (in GPIO port C) to 'output push-pull'. */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO9);
}
static void button_setup(void)
{
/* Enable GPIOA clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
/* Set GPIO0 (in GPIO port A) to 'input open-drain'. */
gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO0);
}
int main(void)
{
int i;
clock_setup();
gpio_setup();
button_setup();
/* Blink the LED (PC9) on the board. */
while (1) {
gpio_toggle(GPIOC, GPIO9);
/* Upon button press, blink more slowly. */
exti_line_state = GPIOA_IDR;
if ((exti_line_state & (1 << 0)) != 0) {
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("nop");
}
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("nop");
}
return 0;
}
examples/stm32/f1/stm32vl-discovery/fancyblink/Makefile
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
##
## This library is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This library 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 Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this library. If not, see <http://www.gnu.org/licenses/>.
##
BINARY = fancyblink
LDSCRIPT = ../stm32vl-discovery.ld
include ../../Makefile.include
examples/stm32/f1/stm32vl-discovery/fancyblink/README
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This is the smallest-possible example program using libopencm3.
It's intended for the ST STM32VLDISCOVERY eval board. It should blink
the LEDs on the board.
examples/stm32/f1/stm32vl-discovery/fancyblink/fancyblink.c
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
* Copyright (C) 2011 Damjan Marion <damjan.marion@gmail.com>
* Copyright (C) 2011 Mark Panajotovic <marko@electrontube.org>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/gpio.h>
/* Set STM32 to 24 MHz. */
static void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_24mhz();
/* Enable GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
}
static void gpio_setup(void)
{
/* Set GPIO8/9 (in GPIO port C) to 'output push-pull'. */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO9);
}
int main(void)
{
int i;
clock_setup();
gpio_setup();
/* Set one LED for wigwag effect when toggling. */
gpio_set(GPIOC, GPIO8);
/* Blink the LEDs (PC8 and PC9) on the board. */
while (1) {
gpio_toggle(GPIOC, GPIO8 | GPIO9); /* Toggle LEDs. */
for (i = 0; i < 2000000; i++) /* Wait a bit. */
__asm__("nop");
}
return 0;
}
examples/stm32/f1/stm32vl-discovery/miniblink/Makefile
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
##
## This library is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This library 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 Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this library. If not, see <http://www.gnu.org/licenses/>.
##
BINARY = miniblink
LDSCRIPT = ../stm32vl-discovery.ld
include ../../Makefile.include
examples/stm32/f1/stm32vl-discovery/miniblink/README
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This is the smallest-possible example program using libopencm3.
It's intended for the ST STM32VLDISCOVERY eval board. It should blink
the blue LED on the board.
examples/stm32/f1/stm32vl-discovery/miniblink/miniblink.c
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/gpio.h>
static void gpio_setup(void)
{
/* Enable GPIOC clock. */
/* Manually: */
// RCC_APB2ENR |= RCC_APB2ENR_IOPCEN;
/* Using API functions: */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
/* Set GPIO8 (in GPIO port C) to 'output push-pull'. */
/* Manually: */
// GPIOC_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << (((8 - 8) * 4) + 2));
// GPIOC_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << ((8 - 8) * 4));
/* Using API functions: */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
}
int main(void)
{
int i;
gpio_setup();
/* Blink the LED (PC8) on the board. */
while (1) {
/* Manually: */
// GPIOC_BSRR = GPIO8; /* LED off */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
// GPIOC_BRR = GPIO8; /* LED on */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
/* Using API functions gpio_set()/gpio_clear(): */
// gpio_set(GPIOC, GPIO8); /* LED off */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
// gpio_clear(GPIOC, GPIO8); /* LED on */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
/* Using API function gpio_toggle(): */
gpio_toggle(GPIOC, GPIO8); /* LED on/off */
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("nop");
}
return 0;
}
examples/stm32/f1/stm32vl-discovery/rtc/Makefile
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
##
## This library is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This library 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 Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this library. If not, see <http://www.gnu.org/licenses/>.
##
BINARY = rtc
LDSCRIPT = ../stm32vl-discovery.ld
include ../../Makefile.include
examples/stm32/f1/stm32vl-discovery/rtc/README
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This is a small RTC example project.
It blinks the ST STM32VLDISCOVERY's blue LED at 1Hz, and sends the value of
the RTC counter register down the serial line (PA9) at 38400,8N1.
examples/stm32/f1/stm32vl-discovery/rtc/rtc.c
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2010 Lord James <lordjames@y7mail.com>
* Copyright (C) 2011 Mark Panajotovic <marko@electrontube.org>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/gpio.h>
#include <libopencm3/stm32/rtc.h>
#include <libopencm3/stm32/usart.h>
#include <libopencm3/stm32/pwr.h>
#include <libopencm3/cm3/nvic.h>
static void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_24mhz();
/* 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);
}
static 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);
/* TODO usart_set_baudrate() doesn't support 24MHz clock (yet). */
/* This is the equivalent: */
USART_BRR(USART1) = (u16)((24000000 << 4) / (38400 * 16));
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);
}
static void gpio_setup(void)
{
/* Set GPIO8 (in GPIO port C) to 'output push-pull'. */
/* This drives the blue LED on the STM32VLDISCOVERY. */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
}
static 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, GPIO8);
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_blocking(USART1, '1');
else
usart_send_blocking(USART1, '0');
}
usart_send_blocking(USART1, '\n');
usart_send_blocking(USART1, '\r');
}
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);
/* The above mode will not reset the RTC when you press the RST button.
* It will also continue to count while the MCU is held in reset. If
* you want it to reset, comment out the above and use the following:
*/
// rtc_awake_from_off(LSE);
// rtc_set_prescale_val(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;
}
examples/stm32/f1/stm32vl-discovery/stm32vl-discovery.ld
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/* Linker script for ST STM32VLDISCOVERY (STM32F100RB, 128K flash, 8K RAM). */
/* Define memory regions. */
MEMORY
{
rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 8K
}
/* Include the common ld script. */
INCLUDE libopencm3_stm32f1.ld
examples/stm32/f1/stm32vl-discovery/usart/Makefile
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
##
## This library is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This library 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 Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this library. If not, see <http://www.gnu.org/licenses/>.
##
BINARY = usart
LDSCRIPT = ../stm32vl-discovery.ld
include ../../Makefile.include
examples/stm32/f1/stm32vl-discovery/usart/README
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------------------------------------------------------------------------------
README
------------------------------------------------------------------------------
This example program sends some characters on USART1 on the
ST STM32VLDISCOVERY eval board.
The terminal settings for the receiving device/PC are 38400 8n1.
The sending is done in a blocking way in the code, see the usart_irq example
for a more elaborate USART example.
examples/stm32/f1/stm32vl-discovery/usart/usart.c
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/gpio.h>
#include <libopencm3/stm32/usart.h>
static void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_24mhz();
/* 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);
}
static 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);
/* TODO usart_set_baudrate() doesn't support 24MHz clock (yet). */
/* This is the equivalent: */
USART_BRR(USART1) = (u16)((24000000 << 4) / (38400 * 16));
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);
}
static void gpio_setup(void)
{
/* Set GPIO9 (in GPIO port C) to 'output push-pull'. [LED] */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO9);
}
int main(void)
{
int i, j = 0, c = 0;
clock_setup();
gpio_setup();
usart_setup();
/* Blink the LED (PC9) on the board with every transmitted byte. */
while (1) {
gpio_toggle(GPIOC, GPIO9); /* LED on/off */
usart_send_blocking(USART1, c + '0'); /* USART1: Send byte. */
c = (c == 9) ? 0 : c + 1; /* Increment c. */
if ((j++ % 80) == 0) { /* Newline after line full. */
usart_send_blocking(USART1, '\r');
usart_send_blocking(USART1, '\n');
}
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("NOP");
}
return 0;
}