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authorUwe Hermann2011-02-09 02:22:20 +0100
committerUwe Hermann2011-02-09 02:48:51 +0100
commit62f3897a2e03a4b935b2ef4b1a694c8923d8e802 (patch)
treea6371ac1529249b687f238cf5487efe85d72297e /examples/stm32/stm32-discovery/button/button.c
parent0a0ce22762136f0a65af13ea2e160913c6af8767 (diff)
Add some examples for the STM32-Discovery board.
This adds a directory of examples, tested on the STM32-Discovery, just modifications of: button, miniblink, fancyblink, usart, and rtc. Thanks Marko Kraljevic <krasnaya.zvezda@gmail.com> for the patch!
Diffstat (limited to 'examples/stm32/stm32-discovery/button/button.c')
-rw-r--r--examples/stm32/stm32-discovery/button/button.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/examples/stm32/stm32-discovery/button/button.c b/examples/stm32/stm32-discovery/button/button.c
new file mode 100644
index 0000000..086d850
--- /dev/null
+++ b/examples/stm32/stm32-discovery/button/button.c
@@ -0,0 +1,75 @@
+/*
+ * 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/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+
+u16 exti_line_state;
+
+/* Set STM32 to 24 MHz. */
+void clock_setup(void)
+{
+ rcc_clock_setup_in_hse_8mhz_out_24mhz();
+}
+
+void gpio_setup(void)
+{
+ /* Enable GPIOC clock. */
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
+
+ /* Set GPIO9 (in GPIO port C) to 'output push-pull'. */
+ gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO9);
+}
+
+void button_setup(void)
+{
+ /* Enable GPIOA clock. */
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
+
+ /* Set GPIO0 (in GPIO port A) to 'input open-drain'. */
+ gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
+ GPIO_CNF_INPUT_FLOAT, GPIO0);
+}
+
+int main(void)
+{
+ int i;
+
+ clock_setup();
+ gpio_setup();
+ button_setup();
+
+ /* Blink the LED (PC9) on the board. */
+ while (1) {
+ gpio_toggle(GPIOC, GPIO9);
+
+ exti_line_state = GPIOA_IDR;
+ if ((exti_line_state & (1 << 0)) != 0) {
+ for (i = 0; i < 800000; i++) /* Wait a bit. */
+ __asm__("nop");
+ }
+
+ for (i = 0; i < 800000; i++) /* Wait a bit. */
+ __asm__("nop");
+ }
+
+ return 0;
+}