采集电池电压不准

1万 · 2020-1-18 14:50

stm32l471

1万 · 2020-1-18 14:53

你得上程序啊

1万 · 2020-1-18 14:58

static void MX_ADC1_Init(void)
{
  ADC_ChannelConfTypeDef sConfig;

/**Common config
*/
  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc1.Init.LowPowerAutoWait = DISABLE;
  hadc1.Init.ContinuousConvMode = DISABLE;
  hadc1.Init.NbrOfConversion = 1;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.NbrOfDiscConversion = 1;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc1.Init.DMAContinuousRequests = DISABLE;
  hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
  hadc1.Init.OversamplingMode = DISABLE;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
_Error_Handler(__FILE__, __LINE__);
  }

/**Configure Regular Channel
*/
  sConfig.Channel = ADC_CHANNEL_VBAT;  //ADC_CHANNEL_TEMPSENSOR  ADC_CHANNEL_VBAT ADC_CHANNEL_VREFINT
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_2CYCLES_5;
  sConfig.SingleDiff = ADC_SINGLE_ENDED;
  sConfig.OffsetNumber = ADC_OFFSET_NONE;
  sConfig.Offset = 0;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
_Error_Handler(__FILE__, __LINE__);
  }

}
float GetVbat11(void)
{
      volatile uint32_t ad;
      float v;
      HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED);
      MyDelay(10000);
      HAL_ADC_Start(&hadc1);
      MyDelay(10000);
      ad = HAL_ADC_GetValue(&hadc1);
      MyDelay(10000);
      ad = HAL_ADC_GetValue(&hadc1);
      //HAL_Delay(10);
      HAL_ADC_Stop(&hadc1);
      v = ad / 4096.0 * 3 * 3 * 1000;
      return v;
}