基于STM32实现当某件事为真时触发定时器中断
时间: 2024-02-18 08:01:03 浏览: 23
首先,您需要配置定时器和外部中断。然后,在外部中断的中断服务函数中,检测某件事是否为真,如果为真,则触发定时器中断。
下面是一个示例代码:
```c
#include "stm32f10x.h"
void EXTI0_IRQHandler(void)
{
if (SOMETHING_IS_TRUE) // 检测某件事是否为真
{
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE); // 触发定时器中断
}
}
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
// 处理定时器中断事件
TIM_ClearITPendingBit(TIM2, TIM_IT_Update); // 清除中断标志位
}
}
int main(void)
{
// 配置定时器
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 1000 - 1; // 定时器周期为1s
TIM_TimeBaseStructure.TIM_Prescaler = 7200 - 1; // 定时器预分频为7200
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
// 配置外部中断
EXTI_InitTypeDef EXTI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
EXTI_InitStructure.EXTI_Line = EXTI_Line0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// 配置定时器中断
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_Cmd(TIM2, ENABLE);
while (1)
{
// 主循环
}
}
```
在上面的代码中,`SOMETHING_IS_TRUE` 是一个代表某件事是否为真的宏定义,您需要根据实际情况修改它。`TIM2` 是定时器的名称,您需要根据实际情况修改定时器名称和定时器参数。
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