STM32 LL库下ADC + DMA多通道连续扫描采集通道错乱问题记录

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         cubemx配置ADC+DMA转换后，代码在 adc.c 中将ADC_REG_InitStruct.DMATransfer 属性设置为：

        LL_ADC_REG_DMA_TRANSFER_UNLIMITED 或者

        LL_ADC_REG_DMA_TRANSFER_LIMITED（在MX中配置时只有这两选项）

，都会在初始化ADC时同时使能DMA。

/* ADC init function */
void MX_ADC_Init(void)
{/* USER CODE BEGIN ADC_Init 0 *//* USER CODE END ADC_Init 0 */LL_ADC_InitTypeDef ADC_InitStruct = {0};LL_ADC_REG_InitTypeDef ADC_REG_InitStruct = {0};LL_GPIO_InitTypeDef GPIO_InitStruct = {0};/* Peripheral clock enable */LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_ADC1);LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOB);/**ADC GPIO ConfigurationPA0   ------> ADC_IN0PA5   ------> ADC_IN5PA6   ------> ADC_IN6PA7   ------> ADC_IN7PB0   ------> ADC_IN8PB1   ------> ADC_IN9*/GPIO_InitStruct.Pin = OTP_Pin;GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;LL_GPIO_Init(OTP_GPIO_Port, &GPIO_InitStruct);GPIO_InitStruct.Pin = VSENSE_Pin;GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;LL_GPIO_Init(VSENSE_GPIO_Port, &GPIO_InitStruct);GPIO_InitStruct.Pin = OVP1_Pin;GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;LL_GPIO_Init(OVP1_GPIO_Port, &GPIO_InitStruct);GPIO_InitStruct.Pin = OVP2_Pin;GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;LL_GPIO_Init(OVP2_GPIO_Port, &GPIO_InitStruct);GPIO_InitStruct.Pin = SIGNAL1_Pin;GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;LL_GPIO_Init(SIGNAL1_GPIO_Port, &GPIO_InitStruct);GPIO_InitStruct.Pin = SIGNAL2_Pin;GPIO_InitStruct.Mode = LL_GPIO_MODE_ANALOG;GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;LL_GPIO_Init(SIGNAL2_GPIO_Port, &GPIO_InitStruct);/* ADC DMA Init *//* ADC Init */LL_DMA_SetDataTransferDirection(DMA1, LL_DMA_CHANNEL_1, LL_DMA_DIRECTION_PERIPH_TO_MEMORY);LL_DMA_SetChannelPriorityLevel(DMA1, LL_DMA_CHANNEL_1, LL_DMA_PRIORITY_LOW);LL_DMA_SetMode(DMA1, LL_DMA_CHANNEL_1, LL_DMA_MODE_CIRCULAR);LL_DMA_SetPeriphIncMode(DMA1, LL_DMA_CHANNEL_1, LL_DMA_PERIPH_NOINCREMENT);LL_DMA_SetMemoryIncMode(DMA1, LL_DMA_CHANNEL_1, LL_DMA_MEMORY_INCREMENT);LL_DMA_SetPeriphSize(DMA1, LL_DMA_CHANNEL_1, LL_DMA_PDATAALIGN_HALFWORD);LL_DMA_SetMemorySize(DMA1, LL_DMA_CHANNEL_1, LL_DMA_MDATAALIGN_HALFWORD);/* USER CODE BEGIN ADC_Init 1 *//* USER CODE END ADC_Init 1 *//** Configure Regular Channel*/LL_ADC_REG_SetSequencerChAdd(ADC1, LL_ADC_CHANNEL_0);/** Configure Regular Channel*/LL_ADC_REG_SetSequencerChAdd(ADC1, LL_ADC_CHANNEL_5);/** Configure Regular Channel*/LL_ADC_REG_SetSequencerChAdd(ADC1, LL_ADC_CHANNEL_6);/** Configure Regular Channel*/LL_ADC_REG_SetSequencerChAdd(ADC1, LL_ADC_CHANNEL_7);/** Configure Regular Channel*/LL_ADC_REG_SetSequencerChAdd(ADC1, LL_ADC_CHANNEL_8);/** Configure Regular Channel*/LL_ADC_REG_SetSequencerChAdd(ADC1, LL_ADC_CHANNEL_9);/** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)*/ADC_InitStruct.Clock = LL_ADC_CLOCK_ASYNC;ADC_InitStruct.Resolution = LL_ADC_RESOLUTION_12B;ADC_InitStruct.DataAlignment = LL_ADC_DATA_ALIGN_RIGHT;ADC_InitStruct.LowPowerMode = LL_ADC_LP_MODE_NONE;LL_ADC_Init(ADC1, &ADC_InitStruct);ADC_REG_InitStruct.TriggerSource = LL_ADC_REG_TRIG_SOFTWARE;ADC_REG_InitStruct.SequencerDiscont = LL_ADC_REG_SEQ_DISCONT_DISABLE;ADC_REG_InitStruct.ContinuousMode = LL_ADC_REG_CONV_CONTINUOUS;ADC_REG_InitStruct.DMATransfer = LL_ADC_REG_DMA_TRANSFER_UNLIMITED;ADC_REG_InitStruct.Overrun = LL_ADC_REG_OVR_DATA_PRESERVED;LL_ADC_REG_Init(ADC1, &ADC_REG_InitStruct);LL_ADC_REG_SetSequencerScanDirection(ADC1, LL_ADC_REG_SEQ_SCAN_DIR_FORWARD);LL_ADC_SetSamplingTimeCommonChannels(ADC1, LL_ADC_SAMPLINGTIME_239CYCLES_5);/* USER CODE BEGIN ADC_Init 2 *//* USER CODE END ADC_Init 2 */}

开启通道转换前，如果调用了 LL_ADC_StartCalibration 开启ADC校准，ADC的DMA转换通道顺序会错乱（比如原本通道0的数据会跑掉其他通道去），在该函数的表述中就有 

        In case of usage of ADC with DMA transfer:
  *         On this STM32 serie, ADC DMA transfer request should be disabled
  *         during calibration:  * @note   In case of usage of ADC with DMA transfer:
  *         On this STM32 serie, ADC DMA transfer request should be disabled
  *         during calibration:
  *         Calibration factor is available in data register
  *         and also transfered by DMA.
  *         To not insert ADC calibration factor among ADC conversion data
  *         in array variable, DMA transfer must be disabled during
  *         calibration.
  *         (DMA transfer setting backup and disable before calibration,
  *         DMA transfer setting restore after calibration.
  *         Refer to functions @ref LL_ADC_REG_GetDMATransfer(),
  *         @ref LL_ADC_REG_SetDMATransfer() ).

/*** @brief  Start ADC calibration in the mode single-ended*         or differential (for devices with differential mode available).* @note   On this STM32 serie, a minimum number of ADC clock cycles*         are required between ADC end of calibration and ADC enable.*         Refer to literal @ref LL_ADC_DELAY_CALIB_ENABLE_ADC_CYCLES.* @note   In case of usage of ADC with DMA transfer:*         On this STM32 serie, ADC DMA transfer request should be disabled*         during calibration:*         Calibration factor is available in data register*         and also transfered by DMA.*         To not insert ADC calibration factor among ADC conversion data*         in array variable, DMA transfer must be disabled during*         calibration.*         (DMA transfer setting backup and disable before calibration,*         DMA transfer setting restore after calibration.*         Refer to functions @ref LL_ADC_REG_GetDMATransfer(),*         @ref LL_ADC_REG_SetDMATransfer() ).* @note   On this STM32 serie, setting of this feature is conditioned to*         ADC state:*         ADC must be ADC disabled.* @rmtoll CR       ADCAL          LL_ADC_StartCalibration* @param  ADCx ADC instance* @retval None*/
__STATIC_INLINE void LL_ADC_StartCalibration(ADC_TypeDef *ADCx)
{/* Note: Write register with some additional bits forced to state reset     *//*       instead of modifying only the selected bit for this function,      *//*       to not interfere with bits with HW property "rs".                  */MODIFY_REG(ADCx->CR,ADC_CR_BITS_PROPERTY_RS,ADC_CR_ADCAL);
}

 由于在初始化时开启了DMA使能，会导致ADC在校准时产生的数据也被DMA搬运；应在 LL_ADC_StartCalibration 前 ADC_REG_InitStruct.DMATransfer 设置为 LL_ADC_REG_DMA_TRANSFER_NONE

LL_ADC_REG_SetDMATransfer(ADC1, LL_ADC_REG_DMA_TRANSFER_NONE);

关闭ADCDMA转换使能;

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