STM32L073 AD转换

只看该作者 · 2017-5-18 21:07

本帖最后由 songxu125400 于 2017-5-18 21:09 编辑

大神们好，我刚接触STM32L0系列芯片，现在搞AD转换，用HAL库，可以正常转换，但是转换时间太长了，效率很低。不知道是我程序有问题还是什么望大神们指点，谢谢。下面是我用库写的
void vInitAdc(void)
{

  AdcHandle.Instance = ADC1;

  AdcHandle.Init.OversamplingMode    = DISABLE;

  AdcHandle.Init.ClockPrescaler       = ADC_CLOCK_SYNC_PCLK_DIV1;
  AdcHandle.Init.LowPowerAutoPowerOff  = DISABLE;
  AdcHandle.Init.LowPowerFrequencyMode = ENABLE;
  AdcHandle.Init.LowPowerAutoWait    = DISABLE;

  AdcHandle.Init.Resolution          = ADC_RESOLUTION_12B;
  AdcHandle.Init.SamplingTime       = ADC_SAMPLETIME_7CYCLES_5;
  AdcHandle.Init.ScanConvMode       = ADC_SCAN_DIRECTION_FORWARD;
  AdcHandle.Init.DataAlign          = ADC_DATAALIGN_RIGHT;
  AdcHandle.Init.ContinuousConvMode = DISABLE;//ENABLE;
  AdcHandle.Init.DiscontinuousConvMode = DISABLE;
  AdcHandle.Init.ExternalTrigConvEdge  = ADC_EXTERNALTRIGCONVEDGE_NONE;
  AdcHandle.Init.EOCSelection       = ADC_EOC_SINGLE_CONV;
  AdcHandle.Init.DMAContinuousRequests = DISABLE;

  /* Initialize ADC peripheral according to the passed parameters */
  if (HAL_ADC_Init(&AdcHandle) != HAL_OK)
  {
;//Error_Handler();
  }

  /* ### - 2 - Start calibration ############################################ */
  if (HAL_ADCEx_Calibration_Start(&AdcHandle, ADC_SINGLE_ENDED) != HAL_OK)
  {
;//Error_Handler();
  }
}

unsigned int uiADC_Result(unsigned char ucChannel)
{
      unsigned char i;
      unsigned int uiMaxResult = 0, uiMinResult = 0xFFFF;
      unsigned int j,uiResult = 0;
   ADC_ChannelConfTypeDef          sConfig;
   ADC1->CHSELR=0;
   ADC1->CHSELR=ucChannel;//sConfig.Channel;
   HAL_ADC_Start(&AdcHandle);

   for (i = 0;i < 6;i++)
      {
      HAL_ADC_PollForConversion(&AdcHandle, 10);
      /* Check if the continous conversion of regular channel is finished */
      if ((HAL_ADC_GetState(&AdcHandle) & HAL_ADC_STATE_REG_EOC) == HAL_ADC_STATE_REG_EOC)
      {
            j = HAL_ADC_GetValue(&AdcHandle);
      }
      if (j > uiMaxResult)
            {
                     uiMaxResult = j;
            }
            if (j < uiMinResult)
            {
                     uiMinResult = j;
            }
            uiResult += j;
         }

         uiResult -= uiMaxResult;
      uiResult -= uiMinResult;
   uiResult /= 4;
return uiResult;
}