帮我写一个stm的定时器中断程序,要求点亮PB5的LED十秒后熄灭,等待下一次调用
时间: 2023-07-15 16:09:55 浏览: 43
好的,下面是一个使用STM32的定时器中断实现点亮PB5的LED十秒后熄灭的代码:
```c
#include "stm32f10x.h"
void TIM3_IRQHandler(void) {
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) {
// 清除中断标志位
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
// 点亮LED
GPIO_SetBits(GPIOB, GPIO_Pin_5);
// 等待十秒
for (int i = 0; i < 10000000; ++i);
// 熄灭LED
GPIO_ResetBits(GPIOB, GPIO_Pin_5);
}
}
int main(void) {
// 初始化GPIOB
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// 初始化TIM3
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
TIM_TimeBaseStructure.TIM_Prescaler = 7200 - 1; // 时钟预分频
TIM_TimeBaseStructure.TIM_Period = 10000 - 1; // 定时器周期
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_Cmd(TIM3, ENABLE);
while (1);
}
```
该代码使用了STM32的定时器TIM3,通过设置预分频和周期实现了每隔10秒产生一次中断,中断函数中点亮LED并等待10秒后熄灭LED。