کد:
HAL_StatusTypeDef HAL_SD_ReadBlocks(SD_HandleTypeDef *hsd, uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks, uint32_t Timeout)
{
SDIO_DataInitTypeDef config;
uint32_t errorstate = HAL_SD_ERROR_NONE;
uint32_t tickstart = HAL_GetTick();
uint32_t count = 0U, *tempbuff = (uint32_t *)pData;
if(NULL == pData)
{
hsd->ErrorCode |= HAL_SD_ERROR_PARAM;
return HAL_ERROR;
}
if(hsd->State == HAL_SD_STATE_READY)
{
hsd->ErrorCode = HAL_DMA_ERROR_NONE;
if((BlockAdd + NumberOfBlocks) > (hsd->SdCard.LogBlockNbr))
{
hsd->ErrorCode |= HAL_SD_ERROR_ADDR_OUT_OF_RANGE;
return HAL_ERROR;
}
hsd->State = HAL_SD_STATE_BUSY;
/* Initialize data control register */
hsd->Instance->DCTRL = 0U;
if(hsd->SdCard.CardType != CARD_SDHC_SDXC)
{
BlockAdd *= 512U;
}
/* Set Block Size for Card */
errorstate = SDMMC_CmdBlockLength(hsd->Instance, BLOCKSIZE);
if(errorstate != HAL_SD_ERROR_NONE)
{
/* Clear all the static flags */
__HAL_SD_CLEAR_FLAG(hsd, SDIO_STATIC_FLAGS);
hsd->ErrorCode |= errorstate;
hsd->State = HAL_SD_STATE_READY;
return HAL_ERROR;
}
/* Configure the SD DPSM (Data Path State Machine) */
config.DataTimeOut = SDMMC_DATATIMEOUT;
config.DataLength = NumberOfBlocks * BLOCKSIZE;
config.DataBlockSize = SDIO_DATABLOCK_SIZE_512B;
config.TransferDir = SDIO_TRANSFER_DIR_TO_SDIO;
config.TransferMode = SDIO_TRANSFER_MODE_BLOCK;
config.DPSM = SDIO_DPSM_ENABLE;
SDIO_ConfigData(hsd->Instance, &config);
/* Read block(s) in polling mode */
if(NumberOfBlocks > 1U)
{
hsd->Context = SD_CONTEXT_READ_MULTIPLE_BLOCK;
/* Read Multi Block command */
errorstate = SDMMC_CmdReadMultiBlock(hsd->Instance, BlockAdd);
}
else
{
hsd->Context = SD_CONTEXT_READ_SINGLE_BLOCK;
/* Read Single Block command */
errorstate = SDMMC_CmdReadSingleBlock(hsd->Instance, BlockAdd);
}
if(errorstate != HAL_SD_ERROR_NONE)
{
/* Clear all the static flags */
__HAL_SD_CLEAR_FLAG(hsd, SDIO_STATIC_FLAGS);
hsd->ErrorCode |= errorstate;
hsd->State = HAL_SD_STATE_READY;
return HAL_ERROR;
}
/* Poll on SDIO flags */
#ifdef SDIO_STA_STBITERR
while(!__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_RXOVERR | SDIO_FLAG_DCRCFAIL | SDIO_FLAG_DTIMEOUT | SDIO_FLAG_DATAEND | SDIO_STA_STBITERR))
#else /* SDIO_STA_STBITERR not defined */
while(!__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_RXOVERR | SDIO_FLAG_DCRCFAIL | SDIO_FLAG_DTIMEOUT | SDIO_FLAG_DATAEND))
#endif /* SDIO_STA_STBITERR */
{
if(__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_RXFIFOHF))
{
/* Read data from SDIO Rx FIFO */
for(count = 0U; count < 8U; count++)
{
*(tempbuff + count) = SDIO_ReadFIFO(hsd->Instance);
}
tempbuff += 8U;
}
if((Timeout == 0U)||((HAL_GetTick()-tickstart) >= Timeout))
{
/* Clear all the static flags */
__HAL_SD_CLEAR_FLAG(hsd, SDIO_STATIC_FLAGS);
hsd->ErrorCode |= HAL_SD_ERROR_TIMEOUT;
hsd->State= HAL_SD_STATE_READY;
return HAL_TIMEOUT;
}
}
/* Send stop transmission command in case of multiblock read */
if(__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_DATAEND) && (NumberOfBlocks > 1U))
{
if(hsd->SdCard.CardType != CARD_SECURED)
{
/* Send stop transmission command */
errorstate = SDMMC_CmdStopTransfer(hsd->Instance);
if(errorstate != HAL_SD_ERROR_NONE)
{
/* Clear all the static flags */
__HAL_SD_CLEAR_FLAG(hsd, SDIO_STATIC_FLAGS);
hsd->ErrorCode |= errorstate;
hsd->State = HAL_SD_STATE_READY;
return HAL_ERROR;
}
}
}
/* Get error state */
if(__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_DTIMEOUT))
{
/* Clear all the static flags */
__HAL_SD_CLEAR_FLAG(hsd, SDIO_STATIC_FLAGS);
hsd->ErrorCode |= HAL_SD_ERROR_DATA_TIMEOUT;
hsd->State = HAL_SD_STATE_READY;
return HAL_ERROR;
}
else if(__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_DCRCFAIL))
{
/* Clear all the static flags */
__HAL_SD_CLEAR_FLAG(hsd, SDIO_STATIC_FLAGS);
hsd->ErrorCode |= HAL_SD_ERROR_DATA_CRC_FAIL;
hsd->State = HAL_SD_STATE_READY;
return HAL_ERROR;
}
else if(__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_RXOVERR))
{
/* Clear all the static flags */
__HAL_SD_CLEAR_FLAG(hsd, SDIO_STATIC_FLAGS);
hsd->ErrorCode |= HAL_SD_ERROR_RX_OVERRUN;
hsd->State = HAL_SD_STATE_READY;
return HAL_ERROR;
}
/* Empty FIFO if there is still any data */
while ((__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_RXDAVL)))
{
*tempbuff = SDIO_ReadFIFO(hsd->Instance);
tempbuff++;
if((Timeout == 0U)||((HAL_GetTick()-tickstart) >= Timeout))
{
/* Clear all the static flags */
__HAL_SD_CLEAR_FLAG(hsd, SDIO_STATIC_FLAGS);
hsd->ErrorCode |= HAL_SD_ERROR_TIMEOUT;
hsd->State= HAL_SD_STATE_READY;
return HAL_ERROR;
}
}
/* Clear all the static flags */
__HAL_SD_CLEAR_FLAG(hsd, SDIO_STATIC_FLAGS);
hsd->State = HAL_SD_STATE_READY;
return HAL_OK;
}
else
{
hsd->ErrorCode |= HAL_SD_ERROR_BUSY;
return HAL_ERROR;
}
}