Some examples for the STM32F4-Disco board

examples/stm32/f4/stm32f4-disco/blink/blink.c

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+/* 
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2014 Chuck McManis (cmcmanis@mcmanis.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/f4/rcc.h>
+#include <libopencm3/stm32/f4/gpio.h>
+
+#define GREEN_LED	GPIO13
+#define RED_LED		GPIO13
+
+int main(void)
+{
+	int i;
+
+	/* Use parameters to set the STM32 clock to 168 MHz. */
+	rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_168MHZ]);
+
+	/* Enable GPIOG clock. (this enables the pins to work) */
+	rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPGEN);
+
+	/* Set the "mode" of the GPIO pin to output, no pullups or pulldowns */
+	gpio_mode_setup(GPIOG, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GREEN_LED );
+
+	/* Turn on the GREEN led */
+	gpio_set(GPIOG, GREEN_LED);
+
+	/* Blink the GREEN LED on the board. */
+	while (1) {
+		/* Toggle LEDs. */
+		gpio_toggle(GPIOG, GREEN_LED);
+		for (i = 0; i < 10000000; i++) /* Wait a bit. */
+			__asm__("nop");
+	}
+
+	return 0;
+}