stm32&定时器中断实验

led.h

#ifndef __LED_H
#define __LED_H
#include "sys.h"

void LED_Init(void);
#define LED0  PBout(5)//红灯
#define LED1  PEout(5)//绿灯

#endif

led.c

#include "led.h"
#include "stm32f10x.h"


void LED_Init(void){
	GPIO_InitTypeDef    GPIO_InitStruct;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOE,ENABLE);
	
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5;
	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB,&GPIO_InitStruct);
	GPIO_SetBits(GPIOB,GPIO_Pin_5);
	
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5;
	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOE,&GPIO_InitStruct);
	GPIO_SetBits(GPIOE,GPIO_Pin_5);
	
}

timer.h

#ifndef __TIMER_H
#define __TIMER_H
#include "sys.h"

void TIM3_Int_Init(u16 arr,u16 psc);


#endif 

timer.c

//通用定时器3中断初始化
//这里时钟选择为APB1的2倍，而APB1为36M
//arr：自动重装值。
//psc：时钟预分频数
//这里使用的是定时器3!
#include "led.h"
#include "timer.h"
#include "stm32f10x.h"

void TIM3_Int_Init(u16 arr,u16 psc){
	TIM_TimeBaseInitTypeDef   TIM_TimeBaseInitStruct;
	NVIC_InitTypeDef          NVIC_InitStruct;
		RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);//时钟使能
	
	TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInitStruct.TIM_Period = arr;//设置在下一个更新事件装入活动的自动重装载寄存器周期的值
	TIM_TimeBaseInitStruct.TIM_Prescaler = psc;//设置用来作为TIMx时钟频率除数的预分频值
	TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStruct);
	
	TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);//使能指定的中断，允许更新中断
	
	NVIC_InitStruct.NVIC_IRQChannel = TIM3_IRQn;//TIM3中断
	NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;//TRQ通道被使能
	NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 2;
	NVIC_InitStruct.NVIC_IRQChannelSubPriority = 2;
	NVIC_Init(&NVIC_InitStruct);//初始化NVIC寄存器
	
	TIM_Cmd(TIM3,ENABLE);//使能TIMx
}
//定时器3中断服务程序
void TIM3_IRQHandler(void){
	if(TIM_GetITStatus(TIM3,TIM_IT_Update)==SET)//检查TIM3更新中断发生与否
    {
		LED1 = !LED1;
		TIM_ClearITPendingBit(TIM3,TIM_IT_Update);//清除TIMx更新中断标志 
	}

}

main.c

#include "stm32f10x.h"
#include "led.h"
#include "timer.h"
#include "delay.h"
#include "usart.h"

int main(void){
	LED_Init();
	delay_init();
	uart_init(115200);
	TIM3_Int_Init(4199,7199);//10KHz的技术频率，计数到5000为500ms
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	
	while(1){
		LED0 = !LED0;
		delay_ms(200);
	}
}