很多論壇提到STM32H723 ADC不準的問題，在安富萊的論壇上很多。實測STM32Cube FW_H7 V1.9.1這個庫生成的ADC的驅動程式碼可以實現ADC的精確測量。
需要注意的是在ADC的初始化後，要對ADC進行校準，如果不進行校準ADC1 ADC2會有50個ADC左右的誤差，ADC3 有接近130個ADC值得誤差。
`void MX_ADC3_Init(void)
{
/* USER CODE BEGIN ADC3_Init 0 */
/* USER CODE END ADC3_Init 0 */
ADC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN ADC3_Init 1 */
/* USER CODE END ADC3_Init 1 /
/* Common config
/
hadc3.Instance = ADC3;
hadc3.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc3.Init.DataAlign = ADC3_DATAALIGN_RIGHT;
hadc3.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc3.Init.EOCSelection = ADC_EOC_SEQ_CONV;
hadc3.Init.LowPowerAutoWait = DISABLE;
hadc3.Init.ContinuousConvMode = ENABLE;
hadc3.Init.NbrOfConversion = 5;
hadc3.Init.DiscontinuousConvMode = DISABLE;
hadc3.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc3.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc3.Init.DMAContinuousRequests = ENABLE;
hadc3.Init.SamplingMode = ADC_SAMPLING_MODE_NORMAL;
hadc3.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DMA_CIRCULAR;
hadc3.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
hadc3.Init.LeftBitShift = ADC_LEFTBITSHIFT_NONE;
hadc3.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc3) != HAL_OK)
{
Error_Handler();
}
/* Configure Regular Channel
/
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC3_SAMPLETIME_640CYCLES_5;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
sConfig.OffsetSign = ADC3_OFFSET_SIGN_NEGATIVE;
sConfig.OffsetSaturation = DISABLE;
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* Configure Regular Channel
/
sConfig.Channel = ADC_CHANNEL_6;
sConfig.Rank = ADC_REGULAR_RANK_2;
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* Configure Regular Channel
/
sConfig.Channel = ADC_CHANNEL_7;
sConfig.Rank = ADC_REGULAR_RANK_3;
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* Configure Regular Channel
/
sConfig.Channel = ADC_CHANNEL_9;
sConfig.Rank = ADC_REGULAR_RANK_4;
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* Configure Regular Channel
/
sConfig.Channel = ADC_CHANNEL_10;
sConfig.Rank = ADC_REGULAR_RANK_5;
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
{
Error_Handler();
}
/ USER CODE BEGIN ADC3_Init 2 /
HAL_ADCEx_Calibration_Start(&hadc3,ADC_CALIB_OFFSET,ADC_SINGLE_ENDED);
/ USER CODE END ADC3_Init 2 */
}`
HAL_ADCEx_Calibration_Start 的第一個引數是使用的ADC的控制代碼，第二個參數列示使用偏移校準模式 第三個參數列示單端模式(ADC3的幾個通道都是使用的單端模式)