I am working on converting projects from STM32F745VET to STM32U575VGT. Part of the startup routine of the projects is checking for flash errors using the CRC peripheral. The STM32F7 projects initialize a DMA channel in the following way:
void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA1_CLK_ENABLE();
__HAL_RCC_DMA2_CLK_ENABLE();
/* Configure DMA request hdma_memtomem_dma2_stream1 on DMA2_Stream1 */
hdma_memtomem_dma2_stream1.Instance = DMA2_Stream1;
hdma_memtomem_dma2_stream1.Init.Channel = DMA_CHANNEL_0;
hdma_memtomem_dma2_stream1.Init.Direction = DMA_MEMORY_TO_MEMORY;
hdma_memtomem_dma2_stream1.Init.PeriphInc = DMA_PINC_ENABLE;
hdma_memtomem_dma2_stream1.Init.MemInc = DMA_MINC_DISABLE;
hdma_memtomem_dma2_stream1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_memtomem_dma2_stream1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_memtomem_dma2_stream1.Init.Mode = DMA_NORMAL;
hdma_memtomem_dma2_stream1.Init.Priority = DMA_PRIORITY_LOW;
hdma_memtomem_dma2_stream1.Init.FIFOMode = DMA_FIFOMODE_ENABLE;
hdma_memtomem_dma2_stream1.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
hdma_memtomem_dma2_stream1.Init.MemBurst = DMA_MBURST_SINGLE;
hdma_memtomem_dma2_stream1.Init.PeriphBurst = DMA_PBURST_SINGLE;
if (HAL_DMA_Init(&hdma_memtomem_dma2_stream1) != HAL_OK)
{
Error_Handler();
}
}
And then in the code:
__HAL_CRC_DR_RESET(&hcrc);
HAL_DMA_Start_IT(&handle_GPDMA1_Channel12, checkstart, CRC_BASE, checkrange);
where checkstart is defined as 0x08000000 and checkrange is 0x0000FFFC
I tried to use a GPDMA channel on the STM32U5 in the same way, but the calculated checksum does not match. Using the HAL_CRC_Calculate function does result in a checksum match, but this uses the CPU instead of offloading it to DMA.
Is there a way to feed the flash into the CRC peripheral through a DMA channel on the STM32U5?
