aboutsummaryrefslogtreecommitdiff
path: root/examples/other/timer_interrupt/timer.c
diff options
context:
space:
mode:
Diffstat (limited to 'examples/other/timer_interrupt/timer.c')
-rw-r--r--examples/other/timer_interrupt/timer.c85
1 files changed, 0 insertions, 85 deletions
diff --git a/examples/other/timer_interrupt/timer.c b/examples/other/timer_interrupt/timer.c
deleted file mode 100644
index d1f2bbb..0000000
--- a/examples/other/timer_interrupt/timer.c
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * This file is part of the libopenstm32 project.
- *
- * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
- *
- * 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 <libopenstm32/rcc.h>
-#include <libopenstm32/flash.h>
-#include <libopenstm32/gpio.h>
-#include <libopenstm32/timer.h>
-#include <libopenstm32/nvic.h>
-
-void gpio_setup(void)
-{
- /* Enable GPIOB clock. */
- rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
-
- /* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
- gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
- GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
- gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
- GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
-}
-
-void nvic_setup()
-{
- /* without this the timer interrupt routine will never be called */
- nvic_enable_irq(NVIC_TIM2_IRQ);
- nvic_set_priority(NVIC_TIM2_IRQ, 1);
-}
-
-void tim2_isr()
-{
- /* LED2 on/off */
- gpio_toggle(GPIOB, GPIO6);
-
- /* clear interrrupt flag */
- TIM_SR(TIM2) &= ~TIM_SR_UIF;
-}
-
-int main(void)
-{
- rcc_clock_setup_in_hse_16mhz_out_72mhz();
- gpio_setup();
- nvic_setup();
-
- gpio_clear(GPIOB, GPIO7); /* LED1 on */
- gpio_set(GPIOB, GPIO6); /* LED2 off */
-
- rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_TIM2EN);
-
- /* the goal is to let the LED2 glow for a second and then be off for a second */
-
- /* Set timer start value */
- TIM_CNT(TIM2) = 1;
-
- /* Set timer prescaler. 72MHz/1440 => 50000 counts per second */
- TIM_PSC(TIM2) = 1440;
-
- /* End timer value. If this value is reached an interrupt is generated */
- TIM_ARR(TIM2) = 50000;
-
- /* Update interrupt enable */
- TIM_DIER(TIM2) |= TIM_DIER_UIE;
-
- /* Start timer */
- TIM_CR1(TIM2) |= TIM_CR1_CEN;
-
- while(1); /* Halt. */
-
- return 0;
-}