stm32led灯一亮一灭间隔1秒
时间: 2023-10-22 12:07:49 浏览: 235
stm32实现LED灯亮灭
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您可以使用STM32的定时器和中断功能来实现这个功能。以下是基本的代码框架:
首先,需要初始化GPIO引脚来控制LED灯。假设您将LED连接到GPIOA的第5个引脚上:
```c
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
```
接下来,需要初始化一个定时器来生成中断信号。假设您使用的是TIM2:
```c
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 999;
TIM_TimeBaseStructure.TIM_Prescaler = 7199;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM2, ENABLE);
```
在定时器中断服务程序中,您可以切换LED的状态:
```c
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
static uint8_t led_state = 0;
if (led_state == 0)
{
GPIO_SetBits(GPIOA, GPIO_Pin_5);
led_state = 1;
}
else
{
GPIO_ResetBits(GPIOA, GPIO_Pin_5);
led_state = 0;
}
}
}
```
最后,您需要在main函数中启用中断:
```c
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
```
这样,LED灯就会每秒钟闪烁一次了。
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