[嵌入式]STM32笔记-定时器TIM中断

一、开发环境

开发板：STM32F407ZE

二、功能：

TIM3中断每1秒亮1次LED1
TIM2中断每1秒亮2次LED2
TIM5中断每1秒亮3次LED3
TIM1中断每1秒亮4次LED4

三、源码

#include "tim.h"
#include "led.h"
#include "stm32f4xx_tim.h"
#include "misc.h"

void tim_init()
{
	//0.定义结构体
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
	NVIC_InitTypeDef NVIC_InitStruct;
	
	//1.初始化时钟
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
	
	//2.定时器外设初始化	
	//APB1预分频为4 168/4=42MHz 作为外设时钟时翻倍，故TIM2-5为84MHz
	//APB2预分频为2 168/2=84MHz 作为外设时钟时翻倍，故TIM1为168MHz
	//TIM3
	TIM_TimeBaseInitStruct.TIM_Prescaler = 8400-1;	//预分频  1-65535 84MHZ/8400 = 10000Hz
	TIM_TimeBaseInitStruct.TIM_Period =	5000-1;	//计数值 0.5s触发一次
	TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;	//向上计数
	TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;	//不分频
	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct);
	//TIM2
	TIM_TimeBaseInitStruct.TIM_Prescaler = 8400-1;	//预分频  1-65535 84MHZ/8400 = 10000Hz
	TIM_TimeBaseInitStruct.TIM_Period =	2500-1;	//计数值 0.25s触发一次
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);
	//TIM5
	TIM_TimeBaseInitStruct.TIM_Prescaler = 8400-1;	//预分频  1-65535 84MHZ/8400 = 10000Hz
	TIM_TimeBaseInitStruct.TIM_Period =	1666-1;	//计数值 0.16s触发一次
	TIM_TimeBaseInit(TIM5, &TIM_TimeBaseInitStruct);
	//TIM1
	TIM_TimeBaseInitStruct.TIM_Prescaler = 16800-1;	//预分频  1-65535 168MHZ/16800 = 10000Hz
	TIM_TimeBaseInitStruct.TIM_Period =	1250-1;	//计数值 0.125s触发一次
	TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStruct);
	
	//3.定时器中断使能
	TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
	TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
	TIM_ITConfig(TIM5, TIM_IT_Update, ENABLE);
	TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);
	
	//4.定时器本身使能
	TIM_Cmd(TIM3, ENABLE);
	TIM_Cmd(TIM2, ENABLE);
	TIM_Cmd(TIM5, ENABLE);
	TIM_Cmd(TIM1, ENABLE);
	
	//5.嵌套向量中断控制器NVIC使能，启用TIM的中断请求通道，并设置其优先级
	//TIM3
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);
	NVIC_InitStruct.NVIC_IRQChannel = TIM3_IRQn;	//指定TIM3_IRQn的中断请求通道
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;	//抢占优先级
	NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;	//响应优先级
	NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;	//打开通道
	NVIC_Init(&NVIC_InitStruct);
	//TIM2
	NVIC_InitStruct.NVIC_IRQChannel = TIM2_IRQn;	//指定TIM2_IRQn的中断请求通道
	NVIC_Init(&NVIC_InitStruct);
	//TIM5
	NVIC_InitStruct.NVIC_IRQChannel = TIM5_IRQn;	//指定TIM5_IRQn的中断请求通道
	NVIC_Init(&NVIC_InitStruct);
	//TIM1
	NVIC_InitStruct.NVIC_IRQChannel = TIM1_UP_TIM10_IRQn;	//指定TIM1_UP_TIM10_IRQn的中断请求通道
	NVIC_Init(&NVIC_InitStruct);
}

//TIM3中断 led1 1秒亮1次
void TIM3_IRQHandler(void)
{
	//判断是否发生中断
	if(TIM_GetITStatus(TIM3, TIM_IT_Update) == SET)
	{
		PFOUT(9) ^= 1;	//切换D1灯亮灭
		//清除EXTI线路挂起位
		TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
	}
}

//TIM2中断 led2 1秒亮2次
void TIM2_IRQHandler(void)
{
	//判断是否发生中断
	if(TIM_GetITStatus(TIM2, TIM_IT_Update) == SET)
	{
		PFOUT(10) ^= 1;	//切换D2灯亮灭
		//清除EXTI线路挂起位
		TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
	}
}

//TIM5中断 led3 1秒亮3次
void TIM5_IRQHandler(void)
{
	//判断是否发生中断
	if(TIM_GetITStatus(TIM5, TIM_IT_Update) == SET)
	{
		PEOUT(13) ^= 1;	//切换D3灯亮灭
		//清除EXTI线路挂起位
		TIM_ClearITPendingBit(TIM5,TIM_IT_Update);
	}
}

//TIM1中断 led4 1秒亮4次
void TIM1_UP_TIM10_IRQHandler(void)
{
	//判断是否发生中断
	if(TIM_GetITStatus(TIM1, TIM_IT_Update) == SET)
	{
		PEOUT(14) ^= 1;	//切换D4灯亮灭
		//清除EXTI线路挂起位
		TIM_ClearITPendingBit(TIM1,TIM_IT_Update);
	}
}