stm32:l0: miniblink example

Very basic, as all miniblinks.

Makefile

@@ -20,7 +20,7 @@
 PREFIX		?= arm-none-eabi
 #PREFIX		?= arm-elf
 
-TARGETS		:= stm32/f0 stm32/f1 stm32/f2 stm32/f3 stm32/f4 stm32/l1
+TARGETS		:= stm32/f0 stm32/f1 stm32/f2 stm32/f3 stm32/f4 stm32/l0 stm32/l1
 TARGETS		+= lpc13xx lpc17xx #lpc43xx
 TARGETS		+= lm3s lm4f
 TARGETS		+= efm32/efm32tg efm32/efm32g efm32/efm32lg efm32/efm32gg

examples/stm32/l0/Makefile.include

@@ -0,0 +1,44 @@
+##
+## 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/>.
+##
+
+LIBNAME		= opencm3_stm32l0
+DEFS		= -DSTM32L0
+
+FP_FLAGS	?= -msoft-float
+ARCH_FLAGS	= -mthumb -mcpu=cortex-m0plus $(FP_FLAGS)
+
+################################################################################
+# OpenOCD specific variables
+
+OOCD		?= openocd
+OOCD_INTERFACE	?= stlink-v2-1
+OOCD_BOARD	?= stm32l0discovery
+
+################################################################################
+# Black Magic Probe specific variables
+# Set the BMP_PORT to a serial port and then BMP is used for flashing
+BMP_PORT	?=
+
+################################################################################
+# texane/stlink specific variables
+#STLINK_PORT	?= :4242
+
+
+include ../../../../Makefile.rules

examples/stm32/l0/stm32l0538-disco/miniblink/Makefile

@@ -0,0 +1,25 @@
+##
+## 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 = $(OPENCM3_DIR)/lib/stm32/l0/stm32l0xx8.ld
+
+include ../../Makefile.include
+

examples/stm32/l0/stm32l0538-disco/miniblink/README

@@ -0,0 +1,9 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This is the smallest-possible example program using libopencm3.
+
+It's intended for the ST STM32L053-DISCOVERY eval board. It should blink
+the red/green LEDs on the board in turn.
+

examples/stm32/l0/stm32l0538-disco/miniblink/miniblink.c

@@ -0,0 +1,60 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
+ * Copyright (C) 2012 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 <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+
+#define LED_GREEN_PIN GPIO4
+#define LED_GREEN_PORT GPIOB
+#define LED_RED_PIN GPIO5
+#define LED_RED_PORT GPIOA
+
+static void gpio_setup(void)
+{
+	/* Enable GPIOB clock. */
+	rcc_periph_clock_enable(RCC_GPIOA);
+	rcc_periph_clock_enable(RCC_GPIOB);
+
+	/* set pins to output mode, push pull */
+	gpio_mode_setup(LED_RED_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_RED_PIN);
+	gpio_mode_setup(LED_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_GREEN_PIN);
+}
+
+int main(void)
+{
+	int i;
+
+	gpio_setup();
+
+	while (1) {
+		/* toggle each led in turn */
+		gpio_toggle(LED_GREEN_PORT, LED_GREEN_PIN);
+		for (i = 0; i < 100000; i++) {	/* Wait a bit. */
+			__asm__("nop");
+		}
+		gpio_toggle(LED_RED_PORT, LED_RED_PIN);
+		for (i = 0; i < 100000; i++) {	/* Wait a bit. */
+			__asm__("nop");
+		}
+	}
+
+	return 0;
+}