单片机入门学习十四 STM32单片机学习十一 通用定时器二

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typedef struct
{
  uint16_t TIM_Channel; //捕获通道1-4   
  uint16_t TIM_ICPolarity; //捕获极性（上升沿捕获[TIM_ICPolarity_Rising]、下降沿捕获[TIM_ICPolarity_Falling]、双边捕获[TIM_ICPolarity_BothEdge]）
  uint16_t TIM_ICSelection; //映射关系
  uint16_t TIM_ICPrescaler; //分频系数
  uint16_t TIM_ICFilter;  //滤波器
} TIM_ICInitTypeDef;

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//定时器5通道1输入捕获配置

void TIM5_Cap_Init(u16 arr,u16 psc)
{    
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
    TIM_ICInitTypeDef  TIM5_ICInitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);    //使能TIM5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5 TIM5   
    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(TIM5, &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TIM5输入捕获参数
    TIM5_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01     选择输入端 IC1映射到TI1上
    TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;    //上升沿捕获
    TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
    TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;   //配置输入分频,不分频 
    TIM5_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器 不滤波
    TIM_ICInit(TIM5, &TIM5_ICInitStructure);

    //中断分组初始化
    NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;  //TIM3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(TIM5,TIM_IT_Update|TIM_IT_CC1,ENABLE);//允许更新中断 ,允许CC1IE捕获中断    

    TIM_Cmd(TIM5,ENABLE );  //使能定时器5
}


u8  TIM5CH1_CAPTURE_STA=0;  //输入捕获状态                            
u16 TIM5CH1_CAPTURE_VAL;    //输入捕获值

//定时器5中断服务程序     
void TIM5_IRQHandler(void)
{ 
    if((TIM5CH1_CAPTURE_STA&0X80)==0)//还未成功捕获   
    {     
        if (TIM_GetITStatus(TIM5, TIM_IT_Update) != RESET)
        {       
            if(TIM5CH1_CAPTURE_STA&0X40)//已经捕获到高电平了
            {
                if((TIM5CH1_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
                {
                    TIM5CH1_CAPTURE_STA|=0X80;//标记成功捕获了一次
                    TIM5CH1_CAPTURE_VAL=0XFFFF;
                }else TIM5CH1_CAPTURE_STA++;
            }    
        }
        if (TIM_GetITStatus(TIM5, TIM_IT_CC1) != RESET)//捕获1发生捕获事件
        {   
            if(TIM5CH1_CAPTURE_STA&0X40)        //捕获到一个下降沿      
            {               
                TIM5CH1_CAPTURE_STA|=0X80;      //标记成功捕获到一次高电平脉宽
                TIM5CH1_CAPTURE_VAL=TIM_GetCapture1(TIM5);
                TIM_OC1PolarityConfig(TIM5,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
            {
                TIM5CH1_CAPTURE_STA=0;          //清空
                TIM5CH1_CAPTURE_VAL=0;
                TIM_SetCounter(TIM5,0);
                TIM5CH1_CAPTURE_STA|=0X40;      //标记捕获到了上升沿
                TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling);     //CC1P=1 设置为下降沿捕获
            }           
        }                                              
    }

    TIM_ClearITPendingBit(TIM5, TIM_IT_CC1|TIM_IT_Update); //清除中断标志位

}

int main(void)
{       
    u32 temp=0; 
    delay_init();            //延时函数初始化    
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);  //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
    uart_init(115200);   //串口初始化为115200


    TIM3_PWM_Init(899,0);       //不分频。PWM频率=72000/(899+1)=80Khz
    TIM5_Cap_Init(0XFFFF,72-1); //以1Mhz的频率计数 
    while(1)
    {
        delay_ms(10);
        TIM_SetCompare2(TIM3,TIM_GetCapture2(TIM3)+1);

        if(TIM_GetCapture2(TIM3)==300)TIM_SetCompare2(TIM3,0);  

        if(TIM5CH1_CAPTURE_STA&0X80)//成功捕获到了一次上升沿
        {
            temp=TIM5CH1_CAPTURE_STA&0X3F;
            temp*=65536;//溢出时间总和
            temp+=TIM5CH1_CAPTURE_VAL;//得到总的高电平时间
            printf("HIGH:%d usrn",temp);//打印总的高点平时间
            TIM5CH1_CAPTURE_STA=0;//开启下一次捕获
        }
    }
}

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typedef struct
{
  uint16_t TIM_OCMode;  //PWM模式1或者模式2
  uint16_t TIM_OutputState; //输出使能 OR失能
  uint16_t TIM_OutputNState;
  uint16_t TIM_Pulse; //比较值，写CCRx
  uint16_t TIM_OCPolarity; //比较输出极性
  uint16_t TIM_OCNPolarity; 
  uint16_t TIM_OCIdleState;  
  uint16_t TIM_OCNIdleState; 
} TIM_OCInitTypeDef;

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//TIM3 PWM部分初始化 
//PWM输出初始化
//arr：自动重装值
//psc：时钟预分频数
void TIM3_PWM_Init(u16 arr,u16 psc)
{  
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    TIM_OCInitTypeDef  TIM_OCInitStructure;


    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);    //使能定时器3时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB  | RCC_APB2Periph_AFIO, ENABLE);  //使能GPIO外设和AFIO复用功能模块时钟

    GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射  TIM3_CH2->PB5    

   //设置该引脚为复用输出功能,输出TIM3 CH2的PWM脉冲波形    GPIOB.5
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //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(GPIOB, &GPIO_InitStructure);//初始化GPIO

   //初始化TIM3
    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
    TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 
    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(TIM3, &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TIM3 Channel2 PWM模式     
    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_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
    TIM_OC2Init(TIM3, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC2

    TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);  //使能TIM3在CCR2上的预装载寄存器

    TIM_Cmd(TIM3, ENABLE);  //使能TIM3
}

int main(void)
{       
    u16 led0pwmval=0;
    u8 dir=1;   
    delay_init();            //延时函数初始化    
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);      //设置NVIC中断分组2:2位抢占优先级，2位响应优先级

    LED_Init();              //LED端口初始化
    TIM3_PWM_Init(899,0);    //不分频。PWM频率=72000000/900=80Khz
    while(1)
    {
        delay_ms(10);    
        if(dir)led0pwmval++;
        else led0pwmval--;

        if(led0pwmval>300)dir=0;
        if(led0pwmval==0)dir=1;                                      
        TIM_SetCompare2(TIM3,led0pwmval);          
    }    
}