Posted by nimishjain1000 on 2018-05-19 07:16

Hi all,
I am struggling with ADC3 in DMA mode( actually BDMA mode) in STM32H743II.

I have tested ADC channels in polling and interrupt mode, everything is working fine. This proves my ADC is running properly.I have also worked on other controller like stm32F767ZI and on that ADC in DMA mode is working properly . Same way I am trying to configure on STM32H743II but struggle to get things done.

Here is the code snippet of the configuration which I setting :
void MX_ADC3_Init(void)
{
ADC_ChannelConfTypeDef sConfig;

/**Common config
*/
hadc3.Instance = ADC3;
hadc3.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV2;
hadc3.Init.Resolution = ADC_RESOLUTION_16B;
hadc3.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc3.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc3.Init.LowPowerAutoWait = DISABLE;
hadc3.Init.ContinuousConvMode = ENABLE;
hadc3.Init.NbrOfConversion = 1;
hadc3.Init.DiscontinuousConvMode = DISABLE;
hadc3.Init.NbrOfDiscConversion = 1;
hadc3.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc3.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc3.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DMA_ONESHOT;
hadc3.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
hadc3.Init.LeftBitShift = ADC_LEFTBITSHIFT_NONE;
hadc3.Init.BoostMode = DISABLE;
hadc3.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc3) != HAL_OK)
{
_Error_Handler(FILE, LINE);
}

/**Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_3;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
{
_Error_Handler(FILE, LINE);
}

}

void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{

GPIO_InitTypeDef GPIO_InitStruct;
if(adcHandle->Instance==ADC3)
{
/* USER CODE BEGIN ADC3_MspInit 0 */

/* USER CODE END ADC3_MspInit 0 */
/* ADC3 clock enable */
__HAL_RCC_ADC3_CLK_ENABLE();

/**ADC3 GPIO Configuration
PF7 --> ADC3_INP3
*/
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);

/* ADC3 DMA Init */
/* ADC3 Init */
hdma_adc3.Instance = BDMA_Channel5;
hdma_adc3.Init.Request = BDMA_REQUEST_ADC3;
hdma_adc3.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_adc3.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_adc3.Init.MemInc = DMA_MINC_ENABLE;
hdma_adc3.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
hdma_adc3.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
hdma_adc3.Init.Mode = DMA_NORMAL;
hdma_adc3.Init.Priority = DMA_PRIORITY_VERY_HIGH;
if (HAL_DMA_Init(&hdma_adc3) != HAL_OK)
{
_Error_Handler(FILE, LINE);
}

__HAL_LINKDMA(adcHandle,DMA_Handle,hdma_adc3);

/* USER CODE BEGIN ADC3_MspInit 1 */

/* USER CODE END ADC3_MspInit 1 */
}
}

After this I wrote my callback functions, Instead of getting in complete conversion or half conversion callback method, the interrupt occur at error callback method.

I have tried with all BDMA channel but still got no positive result .I am badly stuck on this. Please provide any solution to this.

Thanks,
Nimish Jain