timer.c
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#include "timer.h"
/******************************************
* @brief: 定时器3配置
* @param: arr 自动重装值
* psc 分频
* @retval: 无返回值
* @note:
*******************************************/
void TIM3_Config(uint32_t arr,uint16_t psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE); ///使能TIM3时钟
TIM_TimeBaseInitStructure.TIM_Period = arr; //自动重装载值
TIM_TimeBaseInitStructure.TIM_Prescaler = psc; //定时器分频
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure); //初始化TIM3
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); //允许定时器3更新中断
//TIM_Cmd(TIM3,ENABLE); //使能定时器3
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //定时器3中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority= 0x01; //抢占优先级1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01; //子优先级1
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/*******************************
* @brief: 定时器3中断服务函数
* @param:
* @retval:
* @note:
********************************/
bool UART_FINISH = false;
void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3,TIM_IT_Update)==SET) //溢出中断
{
TIM_Cmd(TIM3,DISABLE);
UART_FINISH = true;
}
TIM_ClearITPendingBit(TIM3,TIM_IT_Update); //清除中断标志位
}