STC32使用内部晶振与编码器冲突，编码器采集不到数值。..

只看该作者 · 2016-8-12 20:40

我是一名大二学生，请各位前辈帮帮忙。void SystemInit (void)
{
   /* Set HSION bit */
            RCC->CR |= (uint32_t)0x00000001;

            // select HSI as PLL source
            RCC->CFGR |= (uint32_t)RCC_CFGR_PLLSRC_HSI_Div2;

            RCC->CFGR |= (uint32_t)RCC_CFGR_PLLMULL9;

               /* HCLK = SYSCLK/1    */
         RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;

            /* Enable PLL */
         RCC->CR |= RCC_CR_PLLON;

         /* Wait till PLL is ready */
         while((RCC->CR & RCC_CR_PLLRDY) == 0)
         {
         }
         /* Select PLL as system clock source */
         RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
         RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;

            /* Wait till PLL is used as system clock source */
         while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)
         {
         }

这是使用内部晶振ＨＳＩ的代码

void TIM3_Configuration(void)                   //±àÂëÆ÷½Ó¿ÚÉèÖÃ£¨TIM3£©/PA6-AÏà  PA7-BÏà
{
  GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_ICInitTypeDef  TIM_ICInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);  //Ê¹ÄÜGPIOAÍâÉèÊ±ÖÓ

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;          //ÉèÖÃÎªÉÏÀÊäÈëÄ£Ê½
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;       //IO¿ÚµÄËÙÂÊÎª50M
GPIO_Init(GPIOA, &GPIO_InitStructure);             //IO¿ÚÅäÖÃº¯Êý
GPIO_WriteBit(GPIOA, GPIO_Pin_6,Bit_SET);
GPIO_WriteBit(GPIOA, GPIO_Pin_7,Bit_SET);

  TIM_TimeBaseStructure.TIM_Period = ECDPeriod;          //ÉèÖÃÔÚÏÂÒ»¸ö¸üÐÂÊÂ¼þ×°Èë»î¶¯µÄ×Ô¶¯ÖØ×°ÔØ¼Ä´æÆ÷ÖÜÆÚµÄÖµ
TIM_TimeBaseStructure.TIM_Prescaler = 0;             //ÉèÖÃÓÃÀ´×÷ÎªTIMxÊ±ÖÓÆµÂÊ³ýÊýµÄÔ¤·ÖÆµÖµ  ²»·ÖÆµ
TIM_TimeBaseStructure.TIM_ClockDivision = 0;          //ÉèÖÃÊ±ÖÓ·Ö¸î
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòÉÏ¼ÆÊýÄ£Ê½
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

//ÉèÖÃ¶¨Ê±Æ÷3Îª±àÂëÆ÷Ä£Ê½  IT1 IT2ÎªÉÏÉýÑØ¼ÆÊý
TIM_EncoderInterfaceConfig(TIM3, TIM_EncoderMode_TI12,TIM_ICPolarity_BothEdge,TIM_ICPolarity_BothEdge);
TIM_ICStructInit(&TIM_ICInitStructure);
  TIM_ICInitStructure.TIM_ICFilter = 6;    //ÊäÈëÂË²¨Æ÷
  TIM_ICInit(TIM3, &TIM_ICInitStructure);
  TIM_ClearFlag(TIM3, TIM_FLAG_Update);    //Çå³ýËùÓÐ±êÖ¾Î»
  TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE); //ÔÊÐíÖÐ¶Ï¸üÐÂ
  TIM3->CNT = 0;
TIM_Cmd(TIM3, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

  TIM_TimeBaseStructure.TIM_Period = TIMPeriod-1;
  TIM_TimeBaseStructure.TIM_Prescaler =48-1;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_RepetitionCounter=0;
  TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure);

  TIM_UpdateRequestConfig(TIM4,TIM_UpdateSource_Regular);
  TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE);
  TIM_Cmd(TIM4,ENABLE);

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 15;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

}

EncoderType GetEncoder;

double Get_Encoder_TWO(void)
{
  s32 CNT3_temp,CNT3_last;////////////////////////////!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  GetEncoder.cnt3 = TIM3 -> CNT;
  CNT3_last = GetEncoder.CNT3;
  CNT3_temp = GetEncoder.rcnt3 * prd + GetEncoder.cnt3;
  GetEncoder.V3 = CNT3_temp - CNT3_last;

  while ((s32)(GetEncoder.V3)>Vbreak)
  {
GetEncoder.rcnt3--;
CNT3_temp = GetEncoder.rcnt3 * prd + GetEncoder.cnt3;
GetEncoder.V3 = CNT3_temp - CNT3_last;
  }
  while ((s32)(GetEncoder.V3)<-Vbreak)
  {
GetEncoder.rcnt3++;
CNT3_temp = GetEncoder.rcnt3 * prd + GetEncoder.cnt3;
GetEncoder.V3 = CNT3_temp - CNT3_last;
  }

  GetEncoder.CNT3 = CNT3_temp;

  return CNT3_temp;
}
/*********************************************END OF FILE**********************/

这是编码器的配置，为什么电机能转，定时也准确，就是采集不到编码器的值。