DCMI with DMA interface to AXI_SRAM results in TRANSFER ERROR

Hello

My setup contains an STM32H743 with a camera attached via DCMI interface.

I am trying to acquire single snapshot, but unfortunately experiencing errors.

I declared the following variable on my SRAM

#define BUFF_SIZE (160*120)
ALIGN_32BYTES(uint8_t frame_buff[BUFF_SIZE]);

the variable is allocated in the AXI_SRAM region (0x240....)

i also defined the MPU

 MPU_InitStruct.Enable = MPU_REGION_ENABLE;
 MPU_InitStruct.Number = MPU_REGION_NUMBER0;
 MPU_InitStruct.BaseAddress = D1_AXISRAM_BASE; // (0x24000000)
 MPU_InitStruct.Size = MPU_REGION_SIZE_512KB;
 MPU_InitStruct.SubRegionDisable = 0x0;
 MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
 MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
 MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
 MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
 MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
 MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;

and the DCMI's DMA intialized with

 /* DCMI Init */
 hdma_dcmi.Instance = DMA2_Stream1;
 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_HIGH;
 hdma_dcmi.Init.FIFOMode = DMA_FIFOMODE_ENABLE;
 hdma_dcmi.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
 hdma_dcmi.Init.MemBurst = DMA_MBURST_INC4;
 hdma_dcmi.Init.PeriphBurst = DMA_PBURST_SINGLE;
 if (HAL_DMA_Init(&hdma_dcmi) != HAL_OK)
 {
 Error_Handler();
 }
 
 __HAL_LINKDMA(dcmiHandle,DMA_Handle,hdma_dcmi);
 
 /* DCMI interrupt Init */
 HAL_NVIC_SetPriority(DCMI_IRQn, 15, 0);
 HAL_NVIC_EnableIRQ(DCMI_IRQn);

then, starting the function

HAL_DCMI_Start_DMA(&hdcmi, DCMI_MODE_SNAPSHOT, (uint32_t)frame_buff, BUFF_SIZE);

I found out that my `frame_buff` is empty, and after debugging a while, found out that I keep getting a DMA IRQ which results with the error code

HAL_DMA_ERROR_TE

Please, help me find out the reason for the problem with the data transfer.

Sincerely

Dan