江科大自化协-STM32入门教程-TIM定时中断

最新推荐文章于 2025-03-04 22:20:38 发布

Qian_XiaoHei

最新推荐文章于 2025-03-04 22:20:38 发布

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本文链接：https://blog.youkuaiyun.com/Qian_XiaoHei/article/details/143955480

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TIM输入

简介

基本定时器

通用定时器

高级定时器

定时中断基本结构

内部定时器计数代码

void timer_init(void)
{
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);//RCC使能
	TIM_InternalClockConfig(TIM2);//选择内部时钟
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
	TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;//向上计数
	TIM_TimeBaseInitStruct.TIM_Period = 10000 - 1;//计数
	TIM_TimeBaseInitStruct.TIM_Prescaler = 8400 - 1;//预分频
	TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;//重复计数器，高级定时器才有
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);//时基单元初始化
	TIM_ClearFlag(TIM2, TIM_FLAG_Update);//防止定时器一使能就触发中断
	TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);//中断使能
	
	NVIC_InitTypeDef NVIC_InitStruct;
	NVIC_InitStruct.NVIC_IRQChannel = TIM2_IRQn;
	NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 2;
	NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;
	NVIC_Init(&NVIC_InitStruct);//NVIC初始化
	
	TIM_Cmd(TIM2, ENABLE);//使能定时器
}
static int timer2_count = 0;
void TIM2_IRQHandler(void)
{
	if (TIM_GetITStatus(TIM2, TIM_IT_Update) == SET)
	{
		printf("timer2_count = %d\r\n", timer2_count++);
		TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
	}
}