STM32 USB NAND Flash模擬U盤無法格式化問題的解決
前幾天，一直在尋找NAND Flash模擬U盤程序無法格式化的問題。在中秋月圓之夜，還苦逼地在實驗室調代碼，也許是杭州大圓月的原因，今晚感覺整人特別亢奮，效率也特別高，靈感也多。終于，在不懈的努力下，找到代碼中的害群之馬，把無法格式的問題解決掉了。下面就來說說。
這幾天一直在想問題出在哪里，不知道自己的代碼跟官方的例程對照了多少次，把不一樣的地方全都改了一遍，最終未果。今晚思路特別清晰，于是在想到格式化實際上就是向存儲器寫數(shù)據(jù)而已，而設計到寫數(shù)據(jù)部分的代碼就只在mass_mal.c、memory.c以及存儲器的驅動文件。于是反復檢查這幾個文件，終于發(fā)現(xiàn)一點端倪了，問題出在memroy.c這個文件里。
memory.c這個文件只有兩個函數(shù)：Read_Memory()和Write_Memory()。先貼下代碼吧：
void Read_Memory(uint8_t lun, uint32_t Memory_Offset, uint32_t Transfer_Length)
{
static uint32_t Offset, Length;
if (TransferState == TXFR_IDLE )
{
Offset = Memory_Offset * Mass_Block_Size[lun];
Length = Transfer_Length * Mass_Block_Size[lun];
TransferState = TXFR_ONGOING;
}
if (TransferState == TXFR_ONGOING )
{
if (!Block_Read_count)
{
MAL_Read(lun ,
Offset ,
Data_Buffer,
Mass_Block_Size[lun]);
USB_SIL_Write(EP1_IN, (uint8_t *)Data_Buffer, BULK_MAX_PACKET_SIZE);
Block_Read_count = Mass_Block_Size[lun] - BULK_MAX_PACKET_SIZE;
Block_offset = BULK_MAX_PACKET_SIZE;
}
else
{
USB_SIL_Write(EP1_IN, (uint8_t *)Data_Buffer + Block_offset, BULK_MAX_PACKET_SIZE);
Block_Read_count -= BULK_MAX_PACKET_SIZE;
Block_offset += BULK_MAX_PACKET_SIZE;
}
SetEPTxCount(ENDP1, BULK_MAX_PACKET_SIZE);
#ifndef USE_STM3210C_EVAL
SetEPTxStatus(ENDP1, EP_TX_VALID);
#endif
Offset += BULK_MAX_PACKET_SIZE;
Length -= BULK_MAX_PACKET_SIZE;
CSW.dDataResidue -= BULK_MAX_PACKET_SIZE;
Led_RW_ON();
}
if (Length == 0)
{
Block_Read_count = 0;
Block_offset = 0;
Offset = 0;
Bot_State = BOT_DATA_IN_LAST;
TransferState = TXFR_IDLE;
Led_RW_OFF();
}
}
void Write_Memory (uint8_t lun, uint32_t Memory_Offset, uint32_t Transfer_Length)
{
static uint32_t W_Offset, W_Length;
uint32_t temp = Counter + 64;
if (TransferState == TXFR_IDLE )
{
W_Offset = Memory_Offset * Mass_Block_Size[lun];
W_Length = Transfer_Length * Mass_Block_Size[lun];
TransferState = TXFR_ONGOING;
}
if (TransferState == TXFR_ONGOING )
{
for (Idx = 0 ; Counter < temp; Counter++)
{
*((uint8_t *)Data_Buffer + Counter) = Bulk_Data_Buff[Idx++];
}
W_Offset += Data_Len;
W_Length -= Data_Len;
if (!(W_Length % Mass_Block_Size[lun]))
{
Counter = 0;
MAL_Write(lun ,
W_Offset - Mass_Block_Size[lun],
Data_Buffer,
Mass_Block_Size[lun]);
}
CSW.dDataResidue -= Data_Len;
#ifndef STM32F10X_CL
SetEPRxStatus(ENDP2, EP_RX_VALID); /* enable the next transaction*/
#endif /* STM32F10X_CL */
Led_RW_ON();
}
if ((W_Length == 0) || (Bot_State == BOT_CSW_Send))
{
Counter = 0;
Set_CSW (CSW_CMD_PASSED, SEND_CSW_ENABLE);
TransferState = TXFR_IDLE;
Led_RW_OFF();
}
}
在我的工程（我的工程使用NAND的驅動代碼是網(wǎng)上流行的圈圈寫的驅動）：
我們講下數(shù)據(jù)的傳遞過程，以讀為例子：
1、如果是讀的話會調用Mass_Storage_In()函數(shù)
2、接著Mass_Storage_In會調用SCSI_Write10_Cmd()函數(shù)
void SCSI_Read10_Cmd(uint8_t lun , uint32_t LBA , uint32_t BlockNbr)；
3、SCSI_Read10_Cmd則會調用 Read_Memory(lun, LBA , BlockNbr);
void Read_Memory(uint8_t lun, uint32_t Memory_Offset, uint32_t Transfer_Length)；
4、Read_Memory調用MAL_Read(lun ,Offset ,Data_Buffer,Mass_Block_Size[lun]);
5、MAL_Read還會調用FlashReadOneSector()函數(shù)，該函數(shù)里又有一句：
uint32 FlashReadOneSector(uint32 Addr, uint8 *pBuf, uint32 Remain)
看看FlashReadOneSector()這個函數(shù)：
uint32 FlashReadOneSector(uint32 Addr, uint8 *pBuf, uint32 Remain)
{
uint32 i;
if(Addr>FLASH_MAX_SECTOR_ADDR)return 1; //如果地址超出范圍，則返回失敗代碼1，越界
Addr=FlashAddrRemap(Addr); //重新影射地址
if((Addr&(~(FLASH_PAGE_SIZE-1)))
!=(FlashCurrentReadSectorAddr&(~(FLASH_PAGE_SIZE-1)))) //如果跨page
{
//如果跨頁的，則寫讀數(shù)據(jù)命令
FlashWriteCommand(0x00);
FlashWriteAddr4Byte(Addr);
FlashWriteCommand(0x30);
FlashWait(); //等待數(shù)據(jù)讀回
}
else
{
//如果沒有跨頁，則可以直接讀
FlashWriteCommand(0x05);
FlashWriteAddr2Byte(Addr);
FlashWriteCommand(0xE0);
FlashWait(); //等待數(shù)據(jù)讀回
}
for(i=0;i { pBuf[i]=FlashReadDataByte(); //讀一字節(jié)數(shù)據(jù) } FlashCurrentReadSectorAddr=Addr; //保存當前操作的地址 if(Remain==0) //如果不會接著讀，那么就設置當前讀過的地址為無效值 { FlashCurrentReadSectorAddr=~0; } return 0; } MAL_Read(lun ,Offset ,Data_Buffer,Mass_Block_Size[lun]);將Mass_Block_Size[lun]作為第三個參數(shù)傳遞給FlashReadOneSector()，這個函數(shù)第三個參數(shù)是Remain，在這個代碼中Remain只有在程序最后if(Remain==0)出現(xiàn)過，而我們調用是傳遞Mass_Block_Size[lun]這是個常數(shù)，永遠不會滿足if(Remain==0)這個條件，也就是說程序會一直讀不會停止。 對于寫函數(shù)也一樣：Write_Memory()會調用MAL_Write(lun ,W_Offset - Mass_Block_Size[lun],Data_Buffer,Mass_Block_Size[lun]),MAL_Write()調用FlashWriteOneSector()，這個函數(shù)的代碼如下： uint32 FlashWriteOneSector(uint32 Addr, uint8 * pBuf, uint32 Remain) { uint32 i; uint32 SwapPageAddr; // printf("Addr = 0x%xrn",Addr); // printf("Remain = 0x%xrn",Remain); if(Addr>FLASH_MAX_SECTOR_ADDR)return 1; //如果地址超出范圍，則返回失敗代碼1，越界 Addr=FlashAddrRemap(Addr); //重新影射地址 if((Addr&(~(FLASH_PAGE_SIZE-1)))!=(FlashCurrentWriteSectorAddr&(~(FLASH_PAGE_SIZE-1)))) //如果跨page { // printf("跨頁rn"); if(FlashNeedWriteBack) //如果前面寫了數(shù)據(jù)，則需要將當前讀出的page寫回 { if(FlashWritePage()&0x01) //寫入失敗 { Addr=FlashDealBadBlock(Addr-FLASH_PAGE_SIZE,3)+FLASH_PAGE_SIZE; //壞塊處理 } } if((Addr&(~(FLASH_BLOCK_SIZE-1)))!=(FlashCurrentWriteSectorAddr&(~(FLASH_BLOCK_SIZE-1)))) //如果跨block，則需要擦除新的塊， { //在擦除之前，要先將原來的塊復制到交換區(qū)，并且將該塊前面部分數(shù)據(jù)寫回 //該函數(shù)除了將整塊數(shù)據(jù)復制到交換區(qū)以外，并且還將擦除掉原來的塊，然后將前面部分復制回原來的塊 // printf("跨塊rn"); Addr=FlashCopyBlockToSwap(Addr); } //從交換區(qū)中讀出對應的一頁 FlashWriteCommand(0x00); FlashWriteAddr4Byte(FlashGetCurrentSwapBlock()+(Addr&(FLASH_BLOCK_SIZE-1))); FlashWriteCommand(0x35); FlashWait(); //隨機寫 FlashWriteCommand(0x85); FlashWriteAddr4Byte(Addr); //寫4字節(jié)地址 for(i=0;i { FlashWriteDataByte(pBuf[i]); } FlashNeedWriteBack=1; //需要寫回 } else //沒有超過一頁地址，則直接寫數(shù)據(jù) { //隨機寫 // printf("直接寫rn"); FlashWriteCommand(0x85); FlashWriteAddr2Byte(Addr); for(i=0;i { FlashWriteDataByte(pBuf[i]); } FlashNeedWriteBack=1; //需要寫回 } FlashCurrentWriteSectorAddr=Addr; //保存本次地址 if(Remain==0) //剩余扇區(qū)數(shù)為0，不會再寫了，需要寫回 { if(FlashNeedWriteBack) //如果前面寫了數(shù)據(jù)，則需要將當前讀出的page寫回 { if(FlashWritePage()&0x01) //寫入失敗 { Addr=FlashDealBadBlock(Addr,3); //壞塊處理 } } //計算剩余頁數(shù) Remain=(((Addr+FLASH_BLOCK_SIZE)&(~(FLASH_BLOCK_SIZE-1)))-(Addr&(~(FLASH_PAGE_SIZE-1))))/FLASH_PAGE_SIZE-1; //計算在交換塊中的起始頁地址 SwapPageAddr=FlashGetCurrentSwapBlock()+(Addr&(FLASH_BLOCK_SIZE-1)); for(i=0;i { Addr+=FLASH_PAGE_SIZE; //從下一頁開始寫 SwapPageAddr+=FLASH_PAGE_SIZE; if(0x01==(FlashCopyPage(SwapPageAddr,Addr)&0x01)) //如果復制失敗 { Addr=FlashDealBadBlock(Addr,2); //處理壞塊 } } Fla
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