//-------------------TIM2.c------------------------//
#include "timer.h"
#include "led.h"
//通用定時(shí)器中斷初始化,這里時(shí)鐘選擇為APB1的2倍，而APB1為36M,
//arr：自動(dòng)重裝值。
//psc：時(shí)鐘預(yù)分頻數(shù)
//這里使用的是定時(shí)器2
void Timerx_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //時(shí)鐘使能
TIM_TimeBaseStructure.TIM_Period = 5000; //設(shè)置在下一個(gè)更新事件裝入活動(dòng)的自動(dòng)重裝載寄存器周期的值 計(jì)數(shù)到5000為500ms
TIM_TimeBaseStructure.TIM_Prescaler =(7200-1); //設(shè)置用來作為TIMx時(shí)鐘頻率除數(shù)的預(yù)分頻值 10Khz的計(jì)數(shù)頻率
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設(shè)置時(shí)鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計(jì)數(shù)模式
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //根據(jù)TIM_TimeBaseInitStruct中指定的參數(shù)初始化TIMx的時(shí)間基數(shù)單位
TIM_ITConfig( //使能或者失能指定的TIM中斷
TIM2, //TIM3
TIM_IT_Update | //TIM 中斷源
TIM_IT_Trigger, //TIM 觸發(fā)中斷源
ENABLE //使能
);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //TIM3中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占優(yōu)先級(jí)0級(jí)
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //從優(yōu)先級(jí)3級(jí)
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //根據(jù)NVIC_InitStruct中指定的參數(shù)初始化外設(shè)NVIC寄存器
TIM_Cmd(TIM2, ENABLE); //使能TIMx外設(shè)
}
void TIM2_IRQHandler(void) //TIM2中斷
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) //檢查指定的TIM中斷發(fā)生與否:TIM 中斷源
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update ); //清除TIMx的中斷待處理位:TIM 中斷源
LED0=!LED0;
}
}
//-------------------TIM2.H------------------------//
#ifndef __TIMER_H__
#define __TIMER_H__
#include "sys.h"
void Timerx_Init(u16 arr,u16 psc); //通用定時(shí)器2中斷初始化,這里時(shí)鐘選擇為APB1的2倍，而APB1為36M
void TIM2_IRQHandler(void); //TIM2中斷
#endif