用keil5写一个定时器5让灯500ms闪烁一次
时间: 2024-02-26 14:57:56 浏览: 27
好的,这是一个基于STM32的代码示例:
```c
#include "stm32f10x.h"
void TIM5_IRQHandler(void)
{
if (TIM_GetITStatus(TIM5, TIM_IT_Update) != RESET)
{
GPIO_WriteBit(GPIOA, GPIO_Pin_1, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOA, GPIO_Pin_1))); // 翻转PA1引脚状态
TIM_ClearITPendingBit(TIM5, TIM_IT_Update); // 清除中断标志位
}
}
void TIM5_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
TIM_TimeBaseStructure.TIM_Prescaler = 7200 - 1; // 定时器分频,72MHz / 7200 = 10kHz
TIM_TimeBaseStructure.TIM_Period = 5000 - 1; // 定时器周期,10kHz / 5000 = 500ms
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM5, TIM_IT_Update, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_Cmd(TIM5, ENABLE);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
int main(void)
{
GPIO_Configuration();
TIM5_Configuration();
while (1)
{
// 主循环中不需要写任何代码
}
}
```
在这个例子中,我们使用了定时器5以10kHz的频率触发中断,每次中断时翻转PA1引脚的状态,从而实现了500ms闪烁一次的效果。注意在main函数中需要加上一个空的while循环,否则程序会直接跳出。