stm32f3discovery examples added.

- miniblink
- button
- fancyblink
- adc
- Non tested yet! But they compile.

examples/stm32/f3/stm32f3-discovery/button/button.c

@@ -0,0 +1,78 @@
+/*
+ * 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>
+ * Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
+ * Modified by Fernando Cortes <fermando.corcam@gmail.com>
+ * modified by Guillermo Rivera <memogrg@gmail.com>
+ *
+ * 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>
+
+uint16_t exti_line_state;
+
+/* Set STM32 to 64 MHz. */
+void clock_setup(void)
+{
+	rcc_clock_setup_hsi(&hsi_8mhz[CLOCK_64MHZ]);
+}
+
+void gpio_setup(void)
+{
+	/* Enable GPIOD clock. */
+	rcc_peripheral_enable_clock(&RCC_AHBENR, RCC_AHBENR_IOPEEN);
+
+	/* Set GPIO12 (in GPIO port D) to 'output push-pull'. */
+	gpio_mode_setup(GPIOE, GPIO_MODE_OUTPUT,
+			GPIO_PUPD_NONE, GPIO8 | GPIO9 | GPIO10 | GPIO11);
+}
+
+void button_setup(void)
+{
+	/* Enable GPIOA clock. */
+	rcc_peripheral_enable_clock(&RCC_AHBENR, RCC_AHBENR_IOPAEN);
+
+	/* Set GPIO0 (in GPIO port A) to 'input open-drain'. */
+	gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_NONE, GPIO0);
+}
+
+int main(void)
+{
+	int i;
+
+	clock_setup();
+	button_setup();
+	gpio_setup();
+
+	/* Blink the LED (PD12) on the board. */
+	while (1) {
+		gpio_toggle(GPIOE, GPIO11);
+
+		/* Upon button press, blink more slowly. */
+		exti_line_state = GPIOA_IDR;
+		if ((exti_line_state & (1 << 0)) != 0) {
+			for (i = 0; i < 3000000; i++)	/* Wait a bit. */
+				__asm__("nop");
+		}
+
+		for (i = 0; i < 1000000; i++)		/* Wait a bit. */
+			__asm__("nop");
+	}
+
+	return 0;
+}