STM32_TIM

#include "timer.h"
#include "led.h"
#include "usart.h"
#include "sys.h"
//////////////////////////////////////////////////////////////////////////////////     
//本程序只供学习使用，未经作者许可，不得用于其它任何用途
//ALIENTEK Mini STM32开发板
//PWM  驱动代码               
//正点原子@ALIENTEK
//技术论坛:www.openedv.com
//修改日期:2010/12/03
//版本：V1.0
//版权所有，盗版必究。
//Copyright(C) 正点原子 2009-2019
//All rights reserved
//////////////////////////////////////////////////////////////////////////////////       

//PWM输出初始化
//arr：自动重装值
//psc：时钟预分频数
void TIM1_PWM_Init(u16 arr,u16 psc)
{  
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    TIM_OCInitTypeDef  TIM_OCInitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);// 
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);  //使能GPIO外设时钟使能
                                                                             

   //设置该引脚为复用输出功能,输出TIM1 CH2的PWM脉冲波形
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH2
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    
    TIM_TimeBaseStructure.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     80K
    TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  不分频
    TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

 
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
    TIM_OCInitStructure.TIM_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据TIM_OCInitStruct中指定的参数初始化外设TIMx

    TIM_CtrlPWMOutputs(TIM1,ENABLE);    //MOE 主输出使能    

    TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH1预装载使能     
    
    TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
    
    TIM_Cmd(TIM1, ENABLE);  //使能TIM1
 
   
}

//定时器2通道1输入捕获配置

TIM_ICInitTypeDef  TIM2_ICInitStructure;

void TIM2_Cap_Init(u16 arr,u16 psc)
{     
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
     NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);    //使能TIM2时钟
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //使能GPIOA时钟
    
    GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_0;  //PA0 清除之前设置  
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0 输入  
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_ResetBits(GPIOA,GPIO_Pin_0);                         //PA0 下拉
    
    //初始化定时器2 TIM2     
    TIM_TimeBaseStructure.TIM_Period = arr; //设定计数器自动重装值 
    TIM_TimeBaseStructure.TIM_Prescaler =psc;     //预分频器   
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
  
    //初始化TIM2输入捕获参数
    TIM2_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01     选择输入端 IC1映射到TI1上
      TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;    //上升沿捕获
      TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
      TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;     //配置输入分频,不分频 
      TIM2_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器 不滤波
      TIM_ICInit(TIM2, &TIM2_ICInitStructure);
    
    //中断分组初始化
    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;  //TIM2中断
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;  //先占优先级2级
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  //从优先级0级
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
    NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器 
    
    TIM_ITConfig(TIM2,TIM_IT_Update|TIM_IT_CC1,ENABLE);//允许更新中断 ,允许CC1IE捕获中断    
    
  TIM_Cmd(TIM2,ENABLE );     //使能定时器2
 
}


u8  TIM2CH1_CAPTURE_STA=0;    //输入捕获状态                            
u16    TIM2CH1_CAPTURE_VAL;    //输入捕获值
 
//定时器5中断服务程序     
void TIM2_IRQHandler(void)
{ 

     if((TIM2CH1_CAPTURE_STA&0X80)==0)//还未成功捕获    
    {      
        if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
         
        {        
            if(TIM2CH1_CAPTURE_STA&0X40)//已经捕获到高电平了
            {
                if((TIM2CH1_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
                {
                    TIM2CH1_CAPTURE_STA|=0X80;//标记成功捕获了一次
                    TIM2CH1_CAPTURE_VAL=0XFFFF;
                }else TIM2CH1_CAPTURE_STA++;
            }     
        }
    if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)//捕获1发生捕获事件
        {    
            if(TIM2CH1_CAPTURE_STA&0X40)        //捕获到一个下降沿         
            {                  
                TIM2CH1_CAPTURE_STA|=0X80;        //标记成功捕获到一次上升沿
                TIM2CH1_CAPTURE_VAL=TIM_GetCapture1(TIM2);
                   TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Rising); //CC1P=0 设置为上升沿捕获
            }else                                  //还未开始,第一次捕获上升沿
            {
                TIM2CH1_CAPTURE_STA=0;            //清空
                TIM2CH1_CAPTURE_VAL=0;
                 TIM_SetCounter(TIM2,0);
                TIM2CH1_CAPTURE_STA|=0X40;        //标记捕获到了上升沿
                   TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Falling);        //CC1P=1 设置为下降沿捕获
            }            
        }                                                
     }
 
    TIM_ClearITPendingBit(TIM2, TIM_IT_CC1|TIM_IT_Update); //清除中断标志位
 
}

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

 
 
void TIM1_PWM_Init(u16 arr,u16 psc);
void TIM2_Cap_Init(u16 arr,u16 psc);

#endif