1、执行读写操作时,对于标准卡的地址为什么要乘以512,高容量的卡就不用?
例如函数HAL_StatusTypeDef HAL_SD_WriteBlocks(SD_HandleTypeDef *hsd, uint8_t *pData, uint32_t BlockAdd, uint32_t NumberOfBlocks, uint32_t Timeout)
[C] 纯文本查看 复制代码 if(hsd->SdCard.CardType != CARD_SDHC_SDXC)
{
[color=#ff0000] add *= 512U;[/color]
}
2、函数HAL_StatusTypeDef HAL_SD_ConfigWideBusOperation(SD_HandleTypeDef *hsd, uint32_t WideMode)
调用SD_FindSCR为什么要配置块大小为8byte?
[C] 纯文本查看 复制代码 static uint32_t SD_FindSCR(SD_HandleTypeDef *hsd, uint32_t *pSCR)
{
SDIO_DataInitTypeDef config;
uint32_t errorstate;
uint32_t tickstart = HAL_GetTick();
uint32_t index = 0U;
uint32_t tempscr[2U] = {0U, 0U};
uint32_t *scr = pSCR;
/* Set Block Size To 8 Bytes */
errorstate = [color=#ff0000]SDMMC_CmdBlockLength(hsd->Instance, 8U);[/color]
if(errorstate != HAL_SD_ERROR_NONE)
{
return errorstate;
}
/* Send CMD55 APP_CMD with argument as card's RCA */
errorstate = SDMMC_CmdAppCommand(hsd->Instance, (uint32_t)((hsd->SdCard.RelCardAdd) << 16U));
if(errorstate != HAL_SD_ERROR_NONE)
{
return errorstate;
}
config.DataTimeOut = SDMMC_DATATIMEOUT;
[color=#ff0000] config.DataLength = 8U;[/color]
[color=#ff0000] config.DataBlockSize = SDIO_DATABLOCK_SIZE_8B[/color];
config.TransferDir = SDIO_TRANSFER_DIR_TO_SDIO;
config.TransferMode = SDIO_TRANSFER_MODE_BLOCK;
config.DPSM = SDIO_DPSM_ENABLE;
(void)SDIO_ConfigData(hsd->Instance, &config);
/* Send ACMD51 SD_APP_SEND_SCR with argument as 0 */
errorstate = SDMMC_CmdSendSCR(hsd->Instance);
if(errorstate != HAL_SD_ERROR_NONE)
{
return errorstate;
}
while(!__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_RXOVERR | SDIO_FLAG_DCRCFAIL | SDIO_FLAG_DTIMEOUT))
{
if(__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_RXDAVL))
{
*(tempscr + index) = SDIO_ReadFIFO(hsd->Instance);
index++;
}
else if(!__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_RXACT))
{
break;
}
if((HAL_GetTick() - tickstart) >= SDMMC_DATATIMEOUT)
{
return HAL_SD_ERROR_TIMEOUT;
}
}
if(__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_DTIMEOUT))
{
__HAL_SD_CLEAR_FLAG(hsd, SDIO_FLAG_DTIMEOUT);
return HAL_SD_ERROR_DATA_TIMEOUT;
}
else if(__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_DCRCFAIL))
{
__HAL_SD_CLEAR_FLAG(hsd, SDIO_FLAG_DCRCFAIL);
return HAL_SD_ERROR_DATA_CRC_FAIL;
}
else if(__HAL_SD_GET_FLAG(hsd, SDIO_FLAG_RXOVERR))
{
__HAL_SD_CLEAR_FLAG(hsd, SDIO_FLAG_RXOVERR);
return HAL_SD_ERROR_RX_OVERRUN;
}
else
{
/* No error flag set */
/* Clear all the static flags */
__HAL_SD_CLEAR_FLAG(hsd, SDIO_STATIC_DATA_FLAGS);
*scr = (((tempscr[1] & SDMMC_0TO7BITS) << 24) | ((tempscr[1] & SDMMC_8TO15BITS) << 8) |\
((tempscr[1] & SDMMC_16TO23BITS) >> 8) | ((tempscr[1] & SDMMC_24TO31BITS) >> 24));
scr++;
*scr = (((tempscr[0] & SDMMC_0TO7BITS) << 24) | ((tempscr[0] & SDMMC_8TO15BITS) << 8) |\
((tempscr[0] & SDMMC_16TO23BITS) >> 8) | ((tempscr[0] & SDMMC_24TO31BITS) >> 24));
}
return HAL_SD_ERROR_NONE;
}
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