STM32-移植FATFS的NANDFLASH驱动（2） 接口

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5，媒介控制接口：
  
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• DRESULT disk_ioctl (BYTE drv,BYTE ctrl, void *buff)  
•   {  
•    DRESULT res = RES_OK;  
•    uint32_t result;  
• 
  
•       if (drv){ return RES_PARERR;}  
• 
  
•       switch(ctrl)  
•       {  
•        case CTRL_SYNC:  
•            break;  
•     case GET_BLOCK_SIZE:  
•            <span style="color:#000099;">*(DWORD*)buff = NAND_BLOCK_SIZE</span>;  
•            break;  
•     case GET_SECTOR_COUNT:  
•            <span style="color:#000099;">*(DWORD*)buff = (((NAND_MAX_ZONE/2) * NAND_ZONE_SIZE) * NAND_BLOCK_SIZE);  
• </span>           break;  
•     case GET_SECTOR_SIZE:  
•            <span style="color:#000099;">*(WORD*)buff = NAND_PAGE_SIZE;  
• </span>           break;  
•        default:  
•           <span style="color:#000099;"> res = RES_PARERR;  
• </span>           break;  
•    }  
•       return res;  
•   }  
• 
  

6，媒介多扇区读接口：
  
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• DRESULT disk_read (BYTE drv,BYTE *buff,DWORD sector,BYTE count)  
•   {  
•    uint32_t result;  
• 
  
•       if (drv || !count){  return RES_PARERR;}  
•    result = FSMC_NAND_ReadSmallPage(buff, sector, count);                                                
•       if(result & NAND_READY){  return RES_OK; }  
•       else { return RES_ERROR;  }  
•   }  

7，媒介多扇区写接口：

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• #if _READONLY == 0
  
• DRESULT disk_write (BYTE drv,const
  BYTE *buff,DWORD sector,BYTE count)  
• {  
•   uint32_t result;  
•   uint32_t BackupBlockAddr;  
•   uint32_t WriteBlockAddr;  
•   uint16_t IndexTmp = 0;  
•   uint16_t OffsetPage;  
• 
  
•   /* NAND memory write page at block address*/
  
•   WriteBlockAddr = (sector/NAND_BLOCK_SIZE);  
•   /* NAND memory backup block address*/
  
•   BackupBlockAddr = (WriteBlockAddr + (NAND_MAX_ZONE/2)*NAND_ZONE_SIZE);  
•   OffsetPage = sector%NAND_BLOCK_SIZE;  
• 
  
•      if (drv || !count){  return RES_PARERR;}  
• 
  
•   /* Erase the NAND backup Block */
  
•      result = FSMC_NAND_EraseBlock(BackupBlockAddr*NAND_BLOCK_SIZE);  
• 
  
•      /* Backup the NAND Write Block to High zone*/
  
• 
  
•   for (IndexTmp = 0; IndexTmp < NAND_BLOCK_SIZE; IndexTmp++ )  
•   {  
•    FSMC_NAND_MoveSmallPage (WriteBlockAddr*NAND_BLOCK_SIZE+IndexTmp,BackupBlockAddr*NAND_BLOCK_SIZE+IndexTmp);  
•   }  
• 
  
•   /* Erase the NAND Write Block */
  
•   result = FSMC_NAND_EraseBlock(WriteBlockAddr*NAND_BLOCK_SIZE);  
• 
  
•      /*return write the block  with modify*/
  
•   for (IndexTmp = 0; IndexTmp < NAND_BLOCK_SIZE; IndexTmp++ )  
•   {  
•    if((IndexTmp>=OffsetPage)&&(IndexTmp < (OffsetPage+count)))  
•    {  
•     FSMC_NAND_WriteSmallPage((uint8_t *)buff, WriteBlockAddr*NAND_BLOCK_SIZE+IndexTmp, 1);  
•     buff = (uint8_t *)buff + NAND_PAGE_SIZE;  
•       }  
•    else
  
•    {  
•          FSMC_NAND_MoveSmallPage (BackupBlockAddr*NAND_BLOCK_SIZE+IndexTmp,WriteBlockAddr*NAND_BLOCK_SIZE+IndexTmp);  
•       }  
•   }     
• 
  
•      if(result == NAND_READY){   return RES_OK;}  
•      else {   return RES_ERROR;}  
• }  
• #endif /* _READONLY */
  

五，调用接口及测试代码
1，调用接口，先初始化FSMC和NANDFLASH：
  
[cpp] view plaincopy

• //NANDFLASH HY27UF081G2A-TPCB
  
•   #define NAND_HY_MakerID     0xAD
  
•   #define NAND_HY_DeviceID    0xF1
  
• 
  
•   /* Configure the NAND FLASH */
  
•   void NAND_Configuration(void)  
•   {  
•    NAND_IDTypeDef NAND_ID;  
• 
  
•    /* Enable the FSMC Clock */
  
•    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);  
• 
  
•       /* FSMC Initialization */
  
•    FSMC_NAND_Init();  
• 
  
•    /* NAND read ID command */
  
•    FSMC_NAND_ReadID(&NAND_ID);  
• 
  
•    /* Verify the NAND ID */
  
•    if((NAND_ID.Maker_ID == NAND_ST_MakerID) && (NAND_ID.Device_ID == NAND_ST_DeviceID))  
•    {  
•           printf("ST NANDFLASH");  
•    }  
•       else
  
•       if((NAND_ID.Maker_ID == NAND_HY_MakerID) && (NAND_ID.Device_ID == NAND_HY_DeviceID))  
•    {  
•           printf("HY27UF081G2A-TPCB");  
•    }  
•    printf(" ID = 0x%x%x%x%x \n\r",NAND_ID.Maker_ID,NAND_ID.Device_ID,NAND_ID.Third_ID,NAND_ID.Fourth_ID);  
•   }