STM32F407中的定时器正交编码计数

huochaihe0533

各位高手好，我想对电机的正反转进行计数，所以设计了一块带STM32F407的计数板，想用其中的定时器正交编码接口模式进行计数，因为没有用过单片机，所以很多东西不懂，自己参考别人的改了一个程序，但编译不过去，所以在这里想请教各位。

void Tim_Init(void)

{ 

            void gpio_init(void);

    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

            TIM_ICInitTypeDef TIM_ICInitStructure;

            Tim_Nvic_Init();

    gpio_init();

            RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);      //    TIM3 clock enable 

    /* Compute the prescaler value */

            PrescalerValue = (uint16_t) ((SystemCoreClock / 2) / 6000000) - 1;

 

 /* Time base configuration */

            TIM_TimeBaseStructure.TIM_Period = 65535;

            TIM_TimeBaseStructure.TIM_Prescaler = 0;

            TIM_TimeBaseStructure.TIM_ClockDivision = 0;

            TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

            TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    /* Prescaler configuration */

             TIM_PrescalerConfig(TIM3, PrescalerValue, TIM_PSCReloadMode_Immediate);

    

    /* Timer configuration in Encoder mode */

      TIM_DeInit(ENCODER_TIMER);

             TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);

            TIM_TimeBaseStructure.TIM_Prescaler = 0x0;  // No prescaling 

             TIM_TimeBaseStructure.TIM_Period = ENCODER_TIM_PERIOD;  

              TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

              TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;   

              TIM_TimeBaseInit(ENCODER_TIMER, &TIM_TimeBaseStructure);

              TIM_EncoderInterfaceConfig(ENCODER_TIMER, TIM_EncoderMode_TI12, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);

              TIM_ICStructInit(&TIM_ICInitStructure);

              TIM_ICInitStructure.TIM_ICFilter = ICx_FILTER;

              TIM_ICInit(ENCODER_TIMER, &TIM_ICInitStructure);

//TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_TRC;

      TIM_ICStructInit(&TIM_ICInitStructure);

      TIM_ICInitStructure.TIM_ICFilter = 15;

      TIM_ICInit(TIM3, &TIM_ICInitStructure);

 // Clear all pending interrupts

      TIM_ClearFlag(TIM3, TIM_FLAG_Update|TIM_IT_CC1|TIM_IT_CC2);

      TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);

  //TIM_ITConfig(TIM4, TIM_FLAG_Update, ENABLE);

  //Reset counter

      TIM4->CNT=0x8000;

    /* TIM3 enable counter */

            TIM_Cmd(TIM3, ENABLE);        

}

void gpio_init(void)

{

GPIO_InitTypeDef  GPIO_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

//Connect TIM3 Pin to AF2

GPIO_PinAFConfig(GPIOB,GPIO_PinSource4,GPIO_AF_TIM3);  //TIM3_Ch1

GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_AF_TIM3);  //TIM3_Ch2

/* Configure PB.04,05 as encoder input */

          GPIO_InitStructure.GPIO_Pin=(GPIO_Pin_4|GPIO_Pin_5);

          GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;

                GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; 

GPIO_Init(GPIOB, &GPIO_InitStructure);

}

huochaihe0533

自己顶一下，自己是小白，很多不懂，还望各位高手不吝赐教啊

正点原子

没搞过，帮顶。

灵魂的重量

void TIM3_Int_Init(u16 arr,u16 psc)
{
        TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
        GPIO_InitTypeDef  GPIO_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
//        TIM_ICInitTypeDef  TIM_ICInitStructure;
       
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);  
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
        GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //íÆíêêä3ö
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;//éÏà-
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉ
       
        GPIO_PinAFConfig(GPIOA,GPIO_PinSource6,GPIO_AF_TIM3); //PA0¸′óÃ붨ê±Æ÷5
       
  TIM_TimeBaseInitStructure.TIM_Period = arr;         //×Ô¶ˉÖØ×°ÔØÖμ
        TIM_TimeBaseInitStructure.TIM_Prescaler=psc;  //¶¨ê±Æ÷·ÖÆμ
        TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up; //ÏòéϼÆêyÄ￡ê½
        TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;
        TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);//3õê¼»ˉTIM3
               
        TIM_TIxExternalClockConfig(TIM3, TIM_TIxExternalCLK1Source_TI1, TIM_ICPolarity_Rising, 0);
  
        TIM_CounterModeConfig(TIM3,TIM_CounterMode_Up);//¼ÆêyÄ￡ê½
        TIM_SetCounter(TIM3,0);//éèÖüÆêy3õÖμ
        TIM_Cmd(TIM3,ENABLE); //ê1Äü¶¨ê±Æ÷3
       
        TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); //
        NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn; //
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01; //
        NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x03; //
        NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
        NVIC_Init(&NVIC_InitStructure);
       
}

楼主，看一下这是我配的，计数没问题。

frankzhan

灵魂的重量 发表于 2016-3-9 17:06
void TIM3_Int_Init(u16 arr,u16 psc)
{
        TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;

中断服务函数呢？

灵魂的重量

frankzhan 发表于 2016-3-9 20:17
中断服务函数呢？

void TIM3_IRQHandler(void)
{
        if(TIM_GetITStatus(TIM3,TIM_IT_Update)==SET)
        {
    T3_cnt++;
        }
        TIM_ClearITPendingBit(TIM3,TIM_IT_Update);  
}
这是中断服务函数，也就是说计数值超过65535才会进入中断，否则这个中断是进不来的，里面的T3_cnt是防止计数超过65535进行的次数统计，最终的计数值是counter =TIM_GetCounter(TIM3)+(T3_cnt*0xFFFF);我之前在测试时误差很小，但是如果主函数任务较多的话误差可能会增大。我在项目上主函数任务执行时间较长，最终误差大概在5%以内。