/**
* @brief Reads block(s) from a specified address in an SD card, in DMA mode.
* @param pData: Pointer to the buffer that will contain the data to transmit
* @param ReadAddr: Address from where data is to be read
* @param NumOfBlocks: Number of SD blocks to read
* @retval SD status
*/
uint8_t BSP_SD_ReadBlocks_DMA(uint32_t *pData, uint32_t ReadAddr, uint32_t NumOfBlocks)
{
HAL_StatusTypeDef sd_state = HAL_OK;
/* Invalidate the dma tx handle*/
uSdHandle.hdmatx = NULL;
/* Prepare the dma channel for a read operation */
sd_state = SD_DMAConfigRx(&uSdHandle);
if (sd_state == HAL_OK)
{
/* Read block(s) in DMA transfer mode */
sd_state = HAL_SD_ReadBlocks_DMA(&uSdHandle, (uint8_t *)pData, ReadAddr, NumOfBlocks);
}
if (sd_state == HAL_OK)
{
return MSD_OK;
}
else
{
return MSD_ERROR;
}
}
/**
* @brief Reads block(s) from a specified address in an SD card, in DMA mode.
* @param pData: Pointer to the buffer that will contain the data to transmit
* @param ReadAddr: Address from where data is to be read
* @param BlockSize: SD card data block size, that should be 512
* @param NumOfBlocks: Number of SD blocks to read
* @retval SD status
*/
uint8_t BSP_SD_ReadBlocks_DMA(uint32_t *pData, uint64_t ReadAddr, uint32_t BlockSize, uint32_t NumOfBlocks)
{
uint8_t state = MSD_OK;
/* Invalidate the dma tx handle*/
uSdHandle.hdmatx = NULL;
/* Prepare the dma channel for a read operation */
state = ((SD_DMAConfigRx(&uSdHandle) == SD_OK) ? MSD_OK : MSD_ERROR);
if(state == MSD_OK)
{
/* Read block(s) in DMA transfer mode */
state = ((HAL_SD_ReadBlocks_DMA(&uSdHandle, pData, ReadAddr, BlockSize, NumOfBlocks) == SD_OK) ? MSD_OK : MSD_ERROR);
/* Wait until transfer is complete */
if(state == MSD_OK)
{
state = ((HAL_SD_CheckReadOperation(&uSdHandle, (uint32_t)SD_DATATIMEOUT) == SD_OK) ? MSD_OK : MSD_ERROR);
}
}
return state;
}
