ADC

ADC校准

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HAL_ADCEx_Calibration_Start(ADC_HandleTypeDef* hadc); //先校准ADC
  * @param  hadc: This parameter can be 
            1  &hadc1
            2  &hadc2
  * @retval HAL status
  例子:
  HAL_ADCEx_Calibration_Start(&hadc1);

软件开启一次转换

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uint16_t ADC_IN_1(void) //ADC采集程序
{
   HAL_ADC_Start(&hadc1); //开始ADC采集
   HAL_ADC_PollForConversion(&hadc1,500); //等待采集结束
   if(HAL_IS_BIT_SET(HAL_ADC_GetState(&hadc1), HAL_ADC_STATE_REG_EOC)) //读取ADC完成标志位
   {
     return HAL_ADC_GetValue(&hadc1); //读出ADC数值
   }
     return 0;
}

DMA连续转换

1 开启ADC 连续转换模式(不然转换一次就关闭了)
2 循坏模式 半字数据

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HAL_ADC_Start_DMA(ADC_HandleTypeDef* hadc, uint32_t* pData, uint32_t Length)

  * @param  hadc: ADC handle
  * @param  pData: The destination Buffer address.
  * @param  Length: The length of data to be transferred from ADC peripheral to memory.
  * @retval None

  DMA must be configured to transfer size: half word.
例子:
 HAL_ADC_Start_DMA(&hadc1, (uint32_t *) & a1, 1); 
 adc1   转入a1中  每次连续转换1个