DCMI in JPEG mode DMA configuration?

[BStud.1]

Hello there.

On my board I've setup DCMI to read some arbitrary data from ADC. I've planed to use JPEG mode to just capture all the raw data from ADC while HSYNC is in LOW state. There is my timing diagram:The thing is I do not get FRAME interrupt nor any data in my destination buffer. The LINE and VSYNC Interrupts got triggered, but FRAME and ERROR or any of the DMA interrupts just never happening. For me it looks like pixclk is just ignored somehow, but is definately there. I've tryed setup DCMI by bare registers or by CUBEide.

Is there some common thing I've missed?

Initialization code:

static void MX_DMA_Init(void)
{
 
  /* DMA controller clock enable */
  __HAL_RCC_DMA1_CLK_ENABLE();
 
  /* DMA interrupt init */
  /* DMA1_Stream3_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Stream3_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Stream3_IRQn);
 
}
static void MX_DCMI_Init(void)
{
  hdcmi.Instance = DCMI;
  hdcmi.Init.SynchroMode = DCMI_SYNCHRO_HARDWARE;
  hdcmi.Init.PCKPolarity = DCMI_PCKPOLARITY_FALLING;
  hdcmi.Init.VSPolarity = DCMI_VSPOLARITY_LOW;
  hdcmi.Init.HSPolarity = DCMI_HSPOLARITY_LOW;
  hdcmi.Init.CaptureRate = DCMI_CR_ALL_FRAME;
  hdcmi.Init.ExtendedDataMode = DCMI_EXTEND_DATA_14B;
  hdcmi.Init.JPEGMode = DCMI_JPEG_ENABLE;
  hdcmi.Init.ByteSelectMode = DCMI_BSM_ALL;
  hdcmi.Init.ByteSelectStart = DCMI_OEBS_ODD;
  hdcmi.Init.LineSelectMode = DCMI_LSM_ALL;
  hdcmi.Init.LineSelectStart = DCMI_OELS_ODD;
  if (HAL_DCMI_Init(&hdcmi) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN DCMI_Init 2 */
 
  HAL_DCMI_RegisterCallback(&hdcmi, HAL_DCMI_FRAME_EVENT_CB_ID, dcmi_callback);
  HAL_DCMI_RegisterCallback(&hdcmi, HAL_DCMI_ERROR_CB_ID, dcmi_callback_err);
 
  /* USER CODE END DCMI_Init 2 */
 
}
 
void HAL_DCMI_MspInit(DCMI_HandleTypeDef* hdcmi)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(hdcmi->Instance==DCMI)
  {
  /* USER CODE BEGIN DCMI_MspInit 0 */
 
  /* USER CODE END DCMI_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_DCMI_CLK_ENABLE();
 
    __HAL_RCC_GPIOI_CLK_ENABLE();
    __HAL_RCC_GPIOG_CLK_ENABLE();
    __HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOE_CLK_ENABLE();
    __HAL_RCC_GPIOD_CLK_ENABLE();
    __HAL_RCC_GPIOH_CLK_ENABLE();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**DCMI GPIO Configuration
    PI6     ------> DCMI_D6
    PI5     ------> DCMI_VSYNC
    PI4     ------> DCMI_D5
    PG10     ------> DCMI_D2
    PC10     ------> DCMI_D8
    PI0     ------> DCMI_D13
    PI7     ------> DCMI_D7
    PE1     ------> DCMI_D3
    PD6     ------> DCMI_D10
    PC11     ------> DCMI_D4
    PI2     ------> DCMI_D9
    PH15     ------> DCMI_D11
    PA10     ------> DCMI_D1
    PA9     ------> DCMI_D0
    PG6     ------> DCMI_D12
    PA6     ------> DCMI_PIXCLK
    PH8     ------> DCMI_HSYNC
    */
    
//Pin setup ommited//
 
    /* DCMI DMA Init */
    /* DCMI Init */
    hdma_dcmi.Instance = DMA1_Stream3;
    hdma_dcmi.Init.Request = DMA_REQUEST_DCMI;
    hdma_dcmi.Init.Direction = DMA_PERIPH_TO_MEMORY;
    hdma_dcmi.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_dcmi.Init.MemInc = DMA_MINC_ENABLE;
    hdma_dcmi.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
    hdma_dcmi.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
    hdma_dcmi.Init.Mode = DMA_NORMAL;
    hdma_dcmi.Init.Priority = DMA_PRIORITY_VERY_HIGH;
    hdma_dcmi.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
    if (HAL_DMA_Init(&hdma_dcmi) != HAL_OK)
    {
      Error_Handler();
    }
 
    __HAL_LINKDMA(hdcmi,DMA_Handle,hdma_dcmi);
 
    /* DCMI interrupt Init */
    HAL_NVIC_SetPriority(DCMI_IRQn, 5, 0);
    HAL_NVIC_EnableIRQ(DCMI_IRQn);
  /* USER CODE BEGIN DCMI_MspInit 1 */
 
  /* USER CODE END DCMI_MspInit 1 */
  }
 
}
 
// Start DMA
HAL_DCMI_Start_DMA(&hdcmi, DCMI_MODE_SNAPSHOT, (uint32_t)(ADCData), 64);

Thanks

UPD:

Found in HAL Init() function flowing line:

/* Enable the Line, Vsync, Error and Overrun interrupts */
  __HAL_DCMI_ENABLE_IT(hdcmi, DCMI_IT_LINE | DCMI_IT_VSYNC | DCMI_IT_ERR | DCMI_IT_OVR);

For some reason FRAME_IF is simply not enabled. Hmm.... okay. Anyway, DMA is still does not seem to work.

UPD:

I've disconnected PIXCLK from MCU, but kept V/HSYNC signal inplace. LINE/VSYNC Interrupts stopped generation. Looks like PIXCLK going through DCMI.

UPD:

Tried to poll FNE bit of DCMI->SR register. It always stays at zero. This is all very stange. PIXCLK seems to work, but no data captured.