嵌入式STM32学习—— 定时器中断（应用-利用定时器中断实现LED亮一秒灭一秒）

利用定时器中断实现LED亮一秒灭一秒

time.h

#ifndef TIM_H_
#define TIM_H_void TIM_TimeBase_init(void);#endif

time.c

#include "stm32f10x.h"
#include "time.h"void TIM_TimeBase_init(void)
{TIM_TimeBaseInitTypeDef TIM_TimeBase_initstruct;NVIC_InitTypeDef NVIC_TIM_Initstruct;RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM2,  ENABLE);        //时钟初始化//定时器初始化，定时一秒TIM_TimeBase_initstruct.TIM_ClockDivision = TIM_CKD_DIV1;TIM_TimeBase_initstruct.TIM_CounterMode = TIM_CounterMode_Up;TIM_TimeBase_initstruct.TIM_Period = 7200;			//最大65535TIM_TimeBase_initstruct.TIM_Prescaler = 10000;TIM_TimeBase_initstruct.TIM_RepetitionCounter = 0;TIM_TimeBaseInit( TIM2, &TIM_TimeBase_initstruct);TIM_Cmd( TIM2,  ENABLE);	//定时器使能TIM_ITConfig(TIM2,  TIM_IT_Update, ENABLE  );		//定时器中断更新使能NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);    //中断分组
//中断初始化NVIC_TIM_Initstruct.NVIC_IRQChannel = TIM2_IRQn;NVIC_TIM_Initstruct.NVIC_IRQChannelCmd = ENABLE;NVIC_TIM_Initstruct.NVIC_IRQChannelPreemptionPriority = 0;NVIC_TIM_Initstruct.NVIC_IRQChannelSubPriority = 0;NVIC_Init(&NVIC_TIM_Initstruct);}

led.h

#ifndef LED_H_
#define LED_H_void LED_Init(void);#endif

led.c

#include "led.h"
#include "stm32f10x.h"//初始化LED灯的函数————函数的定义、声明、调用(led.c    led.h  main.c)
void LED_Init(void)
{//1.初始化led引脚GPIOA1GPIO_InitTypeDef  led_initstruct;  //定义GPIO的结构体//2.时钟初始化RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//时钟的初始化led_initstruct.GPIO_Pin = GPIO_Pin_1;led_initstruct.GPIO_Speed = GPIO_Speed_2MHz;led_initstruct.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_Init(GPIOA,&led_initstruct);  //初始化GPIO结构体}

main.c

#include "stm32f10x.h"
#include "main.h"
#include "led.h"
#include "bear.h"
#include "key.h"
#include "shake.h"
#include "usart.h"
#include "stdio.h"
#include "time.h"void delay(uint16_t time) 
{uint16_t i=0;while(time--){i =12000;while(i--);}}int  main() 
{Key_Init();my_usart_init();LED_Init();TIM_TimeBase_init();
//	My_Usart_Send_Byte( USART1,  'A');
//	My_Usart_Send_Byte( USART1,  'B');
//	My_Usart_Send_Byte( USART1,  'C');
//	My_Usart_Send_Sting( USART1,  "\r\n");
//	My_Usart_Send_Sting(USART1 , "fei \r\n");printf("Hello,shi \r\n");while(1){}		
}void TIM2_IRQHandler(void)
{if( TIM_GetITStatus( TIM2,TIM_IT_Update  ) != RESET){GPIO_WriteBit(GPIOA, GPIO_Pin_1, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOA, GPIO_Pin_1)));//对A1引脚进行电平取反//GPIO_ResetBits(GPIOA,GPIO_Pin_1);TIM_ClearITPendingBit(TIM2, TIM_IT_Update );}
}

本文介绍了使用STM32定时器中断实现LED每秒闪烁的方法。通过配置TIM2定时器（周期7200，预分频10000）产生1秒中断，在中断服务程序中翻转GPIOA1引脚电平。系统包含定时器初始化、LED驱动和主程序三部分：定时器模块设置时钟和中断，LED模块初始化GPIOA1为推挽输出，主程序启动各模块后进入循环。中断处理函数TIM2_IRQHandler检测更新事件并执行LED状态切换，实现精确的1秒亮灭周期控制。