FATFS文件系统的SD卡移植

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电梯直达

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楼主 | 2020-4-23 07:07 | 只看该作者回帖奖励

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移植, SD卡, fatfs文件系统, TE, WRITE

FATFS文件系统的底层接口，disk_write中添加SD卡扇区写操作时为什么没有像spi flash移植FATFS那样先进行擦除操作？？？

spi flash的disk_write
DRESULT TM_FATFS_FLASH_SPI_disk_write(BYTE *buff, DWORD sector, UINT count)
{
      uint32_t write_addr;
      FLASH_DEBUG_FUNC();
      sector+=512;
      write_addr = sector<<12;
      SPI_FLASH_SectorErase(write_addr);//进行擦除
      SPI_FLASH_BufferWrite(buff,write_addr,4096);
      return RES_OK;
}

SD的disk_write
DRESULT TM_FATFS_SD_SDIO_disk_write(BYTE *buff, DWORD sector, UINT count)
{
      SD_Error Status = SD_OK;

      if (!TM_FATFS_SDIO_WriteEnabled()) {
            return RES_WRPRT;
      }

      if (SD_Detect() != SD_PRESENT) {
            return RES_NOTRDY;
      }

      if ((DWORD)buff & 3) {
            DRESULT res = RES_OK;
            DWORD scratch[BLOCK_SIZE / 4];

            while (count--) {
                     memcpy(scratch, buff, BLOCK_SIZE);
                     res = TM_FATFS_SD_SDIO_disk_write((void *)scratch, sector++, 1);

                     if (res != RES_OK) {
                              break;
                     }

                     buff += BLOCK_SIZE;
            }

            return(res);
      }

      Status = SD_WriteMultiBlocks((uint8_t *)buff, (uint64_t)sector << 9, BLOCK_SIZE, count); // 4GB Compliant

      if (Status == SD_OK) {
            SDTransferState State;

            Status = SD_WaitWriteOperation(); // Check if the Transfer is finished

            while ((State = SD_GetStatus()) == SD_TRANSFER_BUSY); // BUSY, OK (DONE), ERROR (FAIL)

            if ((State == SD_TRANSFER_ERROR) || (Status != SD_OK)) {
                     return RES_ERROR;
            } else {
                     return RES_OK;
            }
      } else {
            return RES_ERROR;
      }
}

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FATFS文件系统的SD卡移植

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