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Diffstat (limited to 'examples/stm32/f1/obldc/led/led.c')
-rw-r--r--examples/stm32/f1/obldc/led/led.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/examples/stm32/f1/obldc/led/led.c b/examples/stm32/f1/obldc/led/led.c
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+++ b/examples/stm32/f1/obldc/led/led.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 program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/f1/rcc.h>
+#include <libopencm3/stm32/f1/gpio.h>
+
+/* Set STM32 to 72 MHz. */
+void clock_setup(void)
+{
+ rcc_clock_setup_in_hse_8mhz_out_72mhz();
+
+ /* Enable GPIOA clock. */
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
+
+ /* Enable GPIOB clock. */
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
+}
+
+void gpio_setup(void)
+{
+ /* Set GPIO6 and 7 (in GPIO port A) to 'output push-pull'. */
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO6 | GPIO7);
+
+ /* Set GPIO0 and 1 (in GPIO port B) to 'output push-pull'. */
+ gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO0 | GPIO1);
+}
+
+int main(void)
+{
+ int i;
+
+ clock_setup();
+ gpio_setup();
+
+ /* Blink the LEDs on the board. */
+ while (1) {
+ gpio_toggle(GPIOA, GPIO6); /* LED on/off */
+ for (i = 0; i < 8000000; i++) /* Wait a bit. */
+ __asm__("nop");
+ gpio_toggle(GPIOA, GPIO7); /* LED on/off */
+ for (i = 0; i < 8000000; i++) /* Wait a bit. */
+ __asm__("nop");
+ gpio_toggle(GPIOB, GPIO0); /* LED on/off */
+ for (i = 0; i < 8000000; i++) /* Wait a bit. */
+ __asm__("nop");
+ gpio_toggle(GPIOB, GPIO1); /* LED on/off */
+ for (i = 0; i < 8000000; i++) /* Wait a bit. */
+ __asm__("nop");
+ }
+
+ return 0;
+}