stm32f030的AD问题

Ring

想设置一个单次转换

用cubemx生成的AD配置代码：
static void MX_ADC_Init(void)
{

  ADC_ChannelConfTypeDef sConfig;

    /**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
    */
  hadc.Instance = ADC1;
  hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
  hadc.Init.Resolution = ADC_RESOLUTION_8B;
  hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
  hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc.Init.LowPowerAutoWait = DISABLE;
  hadc.Init.LowPowerAutoPowerOff = DISABLE;
  hadc.Init.ContinuousConvMode = DISABLE;
  hadc.Init.DiscontinuousConvMode = DISABLE;
  hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc.Init.DMAContinuousRequests = DISABLE;
  hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
  if (HAL_ADC_Init(&hadc) != HAL_OK)
  {
    Error_Handler();
  }
}



自己写的读AD值代码：
  uint16_t        adresult;

  ADC_ChannelConfTypeDef sConfig;
               
  sConfig.Channel      = ADC_CHANNEL_7;
  sConfig.Rank         = ADC_RANK_CHANNEL_NUMBER;
  sConfig.SamplingTime = ADC_SAMPLETIME_55CYCLES_5;
  HAL_ADC_ConfigChannel(&hadc, &sConfig);
       
        if (HAL_ADCEx_Calibration_Start(&hadc) != HAL_OK)
  {
    Error_Handler();
  }

        HAL_ADC_Start(&hadc);  
        HAL_ADC_PollForConversion(&hadc,10);
       
        adresult=HAL_ADC_GetValue(&hadc);


PA7(ADC_CHANNEL_7)接3.3V，调试查看adresult的值每次都不同，很乱！！！！！！




求大神赐教一下问题所在！！！！！

正点原子

不对