stm32定时器中断控制led
时间: 2023-09-09 10:10:13 浏览: 108
好的,下面给您提供一个使用STM32定时器控制LED的基本示例代码,您可以根据您的具体需求进行修改:
```c
#include "stm32f10x.h"
void GPIO_Configuration(void);
void TIM_Configuration(void);
int main(void)
{
GPIO_Configuration();
TIM_Configuration();
while(1)
{
// 空循环
}
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// 使能GPIOB时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
// 配置PB5为推挽输出
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);
}
void TIM_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
// 使能TIM3时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
// TIM3的中断优先级为0
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// 设置TIM3的时间基准
TIM_TimeBaseStructure.TIM_Period = 999; // 计数周期为1000
TIM_TimeBaseStructure.TIM_Prescaler = 71; // 预分频器为72
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
// 使能TIM3更新中断
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
// 启动TIM3
TIM_Cmd(TIM3, ENABLE);
}
void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
{
// 翻转LED状态
GPIO_WriteBit(GPIOB, GPIO_Pin_5, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_5)));
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
}
}
```
上述代码中使用了STM32F10x的TIM3定时器控制LED的闪烁,定时器中断的频率为1kHz,也就是每隔1ms中断一次,翻转LED状态。您可以根据需要修改定时器的计数周期和预分频器的值来改变定时器中断的频率。同时,也可以通过修改GPIO的配置来控制其他的LED或者IO口。
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