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Diffstat (limited to 'examples/stm32/f4/stm32-discovery/miniblink/miniblink.c')
-rw-r--r--examples/stm32/f4/stm32-discovery/miniblink/miniblink.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/examples/stm32/f4/stm32-discovery/miniblink/miniblink.c b/examples/stm32/f4/stm32-discovery/miniblink/miniblink.c
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index 0000000..1bbcbe2
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+++ b/examples/stm32/f4/stm32-discovery/miniblink/miniblink.c
@@ -0,0 +1,73 @@
+/*
+ * 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>
+ *
+ * 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/f4/rcc.h>
+#include <libopencm3/stm32/f4/gpio.h>
+
+void gpio_setup(void)
+{
+ /* Enable GPIOD clock. */
+ /* Manually: */
+ // RCC_AHB1ENR |= RCC_AHB1ENR_IOPDEN;
+ /* Using API functions: */
+ rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPDEN);
+
+ /* Set GPIO12 (in GPIO port D) to 'output push-pull'. */
+ /* Manually: */
+ // GPIOD_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << (((8 - 8) * 4) + 2));
+ // GPIOD_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << ((8 - 8) * 4));
+ /* Using API functions: */
+ gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT,
+ GPIO_PUPD_NONE,
+ GPIO12);
+}
+
+int main(void)
+{
+ int i;
+
+ gpio_setup();
+
+ /* Blink the LED (PC8) on the board. */
+ while (1) {
+ /* Manually: */
+ // GPIOD_BSRR = GPIO12; /* LED off */
+ // for (i = 0; i < 1000000; i++) /* Wait a bit. */
+ // __asm__("nop");
+ // GPIOD_BRR = GPIO12; /* LED on */
+ // for (i = 0; i < 1000000; i++) /* Wait a bit. */
+ // __asm__("nop");
+
+ /* Using API functions gpio_set()/gpio_clear(): */
+ // gpio_set(GPIOD, GPIO12); /* LED off */
+ // for (i = 0; i < 1000000; i++) /* Wait a bit. */
+ // __asm__("nop");
+ // gpio_clear(GPIOD, GPIO12); /* LED on */
+ // for (i = 0; i < 1000000; i++) /* Wait a bit. */
+ // __asm__("nop");
+
+ /* Using API function gpio_toggle(): */
+ gpio_toggle(GPIOD, GPIO12); /* LED on/off */
+ for (i = 0; i < 1000000; i++) /* Wait a bit. */
+ __asm__("nop");
+ }
+
+ return 0;
+}