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authorStephen Caudle2011-10-31 00:16:37 -0400
committerStephen Caudle2011-10-31 00:16:37 -0400
commit580d25a84baaa160b0afdc096e9aa1e8ca1c2d2b (patch)
treed3df10cb7a99745eafabe15a0ec286dc9923b4e8 /examples/stm32/f1/obldc/systick/systick.c
parent68d2e0d1e3c587e18eef6a6ef9c40b3549b2f9e7 (diff)
Move STM32 example projects in family specific folders
Diffstat (limited to 'examples/stm32/f1/obldc/systick/systick.c')
-rw-r--r--examples/stm32/f1/obldc/systick/systick.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/examples/stm32/f1/obldc/systick/systick.c b/examples/stm32/f1/obldc/systick/systick.c
new file mode 100644
index 0000000..263230f
--- /dev/null
+++ b/examples/stm32/f1/obldc/systick/systick.c
@@ -0,0 +1,90 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ * 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/flash.h>
+#include <libopencm3/stm32/f1/gpio.h>
+#include <libopencm3/stm32/nvic.h>
+#include <libopencm3/stm32/systick.h>
+
+u32 temp32;
+
+void gpio_setup(void)
+{
+ /* Enable GPIOA clock. */
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
+
+ /* Enable GPIOB clock. */
+ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
+
+ gpio_set(GPIOA, GPIO6); /* LED0 off */
+ gpio_set(GPIOA, GPIO7); /* LED1 off */
+ gpio_set(GPIOB, GPIO0); /* LED2 off */
+ gpio_set(GPIOB, GPIO1); /* LED3 off */
+
+ /* Set GPIO6/7 (in GPIO port A) to 'output push-pull' for the LEDs. */
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
+ gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
+
+ /* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
+ gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO0);
+ gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
+ GPIO_CNF_OUTPUT_PUSHPULL, GPIO1);
+}
+
+void sys_tick_handler(void)
+{
+ temp32++;
+
+ /* We call this handler every 1ms so 1000ms = 1s on/off. */
+ if (temp32 == 1000) {
+ gpio_toggle(GPIOA, GPIO6); /* LED2 on/off */
+ temp32 = 0;
+ }
+}
+
+int main(void)
+{
+ rcc_clock_setup_in_hse_8mhz_out_72mhz();
+ gpio_setup();
+
+ gpio_clear(GPIOA, GPIO7); /* LED1 on */
+ gpio_set(GPIOA, GPIO6); /* LED2 off */
+
+ temp32 = 0;
+
+ /* 72MHz / 8 => 9000000 counts per second */
+ systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8);
+
+ /* 9000000/9000 = 1000 overflows per second - every 1ms one interrupt */
+ systick_set_reload(9000);
+
+ systick_interrupt_enable();
+
+ /* Start counting. */
+ systick_counter_enable();
+
+ while (1); /* Halt. */
+
+ return 0;
+}