Add clock config example

Author: Sync-

examples/stm32/f7/stm32f7-discovery/fancyblink/Makefile

@@ -0,0 +1,25 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <[email protected]>
+##
+## 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 = ../stm32f7-discovery.ld
+
+include ../../Makefile.include
+

examples/stm32/f7/stm32f7-discovery/fancyblink/README.md

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+# README
+
+Minibink example with clocks enabled. This tests the PLL settings.
+
+## Board connections
+
+*none required*

examples/stm32/f7/stm32f7-discovery/fancyblink/fancyblink.c

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+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <[email protected]>
+ * Copyright (C) 2011 Stephen Caudle <[email protected]>
+ *
+ * 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>
+
+static void clock_setup(void) 
+{
+	rcc_clock_setup_hse_3v3(&hse_25mhz_3v3[CLOCK_3V3_216MHZ]);
+	rcc_periph_clock_enable(RCC_GPIOI);
+}
+
+static void gpio_setup(void)
+{
+
+	gpio_mode_setup(GPIOI, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO1);
+}
+
+int main(void)
+{
+	int i;
+	
+	clock_setup();
+	gpio_setup();
+
+	/* Blink the LED (PI1) on the board. */
+	while (1) {
+
+		/* Using API function gpio_toggle(): */
+		gpio_toggle(GPIOI, GPIO1);	/* LED on/off */
+		for (i = 0; i < 13500000; i++) {	/* Wait a bit. */
+			__asm__("nop");
+		}
+	}
+
+	return 0;
+}