STM32 USB SD卡读卡器和NAND FLASH模拟U盘

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本次工程是要同时实现SD卡读卡器和NAND Flash模拟U盘的功能。结合之前的两个工程，稍稍修改下就可以了。

既然要实现两个盘，当然在usb_prop.c中的Max_Lun变量赋值为1，在USB_User组中同时添加fsmc_nand.c和sdio_sdcard.c这两个文件，在外设库中挺尸添加stm32f10x_sdio.c和stm32f10x_fsmc.c两个文件。

添加完之后，可能会有些许的错误，解决完后，我们就要修改下mass_mal.c文件了，这个文件本次要同时实现SD卡和NAND Flash的相关驱动代码的挂接，代码如下：

uint32_t Mass_Memory_Size[2];
uint32_t Mass_Block_Size[2];
uint32_t Mass_Block_Count[2];
__IO uint32_t Status = 0;

uint16_t MAL_Init(uint8_t lun)
{
  	u16 status = MAL_OK;  	switch (lun)
  	{
  		case 0:
			Status = SD_Init();  //调用SD初始化函数
			break;
		case 1:  
			FlashInit();
			break;
    	default:
            return MAL_FAIL;
  }
  return status;
}


uint16_t MAL_Write(uint8_t lun, uint32_t Memory_Offset, uint32_t *Writebuff, uint16_t Transfer_Length)
{
	switch (lun)
  	{
    	case 0:
			Status = SD_WriteBlock((uint8_t*)Writebuff, Memory_Offset, Transfer_Length);
			SD_WaitWriteOperation();	   				//等待dma传输结束
	  		while(SD_GetStatus() != SD_TRANSFER_OK); 	//等待sdio到sd卡传输结束
      		if ( Status != SD_OK )
      		{
        		return MAL_FAIL;
      		}  
			break;  
		case 1: 		  
			FlashWriteOneSector(Memory_Offset,(u8*)Writebuff, Transfer_Length);
      			break;
    default:
      return MAL_FAIL;
  }
  return MAL_OK;
}


uint16_t MAL_Read(uint8_t lun, uint32_t Memory_Offset, uint32_t *Readbuff, uint16_t Transfer_Length)
{  switch (lun)
  {
    case 0:  
		Status = SD_ReadBlock((uint8_t*)Readbuff, Memory_Offset, Transfer_Length);
		SD_WaitReadOperation();	   				//等待dma传输结束
	  	while(SD_GetStatus() != SD_TRANSFER_OK); 	//等待sdio到sd卡传输结束
      	if ( Status != SD_OK )
      	{
        	return MAL_FAIL;
      	}  
		break;
	case 1:
		FlashReadOneSector(Memory_Offset, (u8*)Readbuff, Transfer_Length);
        break;
    default:
      return MAL_FAIL;
  }
  return MAL_OK;
}

uint16_t MAL_GetStatus (uint8_t lun)
{
   	uint32_t DeviceSizeMul = 0, NumberOfBlocks = 0;
   	if (lun == 0)
   	{
		if (SD_Init() == SD_OK)
		{
			SD_GetCardInfo(&SDCardInfo);
			SD_SelectDeselect((uint32_t) (SDCardInfo.RCA << 16));
			DeviceSizeMul = (SDCardInfo.SD_csd.DeviceSizeMul + 2);
			
			if(SDCardInfo.CardType == SDIO_HIGH_CAPACITY_SD_CARD)
			{
				Mass_Block_Count[0] = (SDCardInfo.SD_csd.DeviceSize + 1) * 1024;
			}
			else
			{
				NumberOfBlocks  = ((1 << (SDCardInfo.SD_csd.RdBlockLen)) / 512);
				Mass_Block_Count[0] = ((SDCardInfo.SD_csd.DeviceSize + 1) * (1 << DeviceSizeMul) << (NumberOfBlocks/2));
			}
			Mass_Block_Size[0]  = 512;
			
			Status = SD_SelectDeselect((uint32_t) (SDCardInfo.RCA << 16)); 
			Status = SD_EnableWideBusOperation(SDIO_BusWide_4b); 
			if ( Status != SD_OK )
			{
				return MAL_FAIL;
			}
			LED2_ON();
			return MAL_OK;
		}
		else
		{
			LED2_OFF();
		}
	}
	else
	{
		Mass_Block_Count[1] =  FLASH_MAX_SECTOR_ADDR/FLASH_SECTOR_SIZE;  //NAND_ZONE_SIZE * NAND_BLOCK_SIZE * NAND_MAX_ZONE ;
		Mass_Block_Size[1]  =  FLASH_SECTOR_SIZE;                        //NAND_PAGE_SIZE;
		Mass_Memory_Size[1] = (Mass_Block_Count[1] * Mass_Block_Size[1]);//这里的NAND要选择Mass_Block_Count[1]和Mass_Block_Size[1]
		LED4_ON();														 //因为SD的的是Mass_Block_Count[0]和Mass_Block_Size[0]
		return MAL_OK;
	}
  	return MAL_FAIL;
}

这样就可以在电脑上同时出现两个盘，分别是SD卡和NAND模拟出来的。

STM32 USB SD卡读卡器和NAND FLASH模拟U盘 - ziye334 - ziye334的博客

在调是这个代码之前，曾经粗心，把MAL_GetStatus()l里的NAND相关代码的下成如下：

Mass_Block_Count[0] = FLASH_MAX_SECTOR_ADDR/FLASH_SECTOR_SIZE;
Mass_Block_Size[0] = FLASH_SECTOR_SIZE;
Mass_Memory_Size[0] = (Mass_Block_Count[0] * Mass_Block_Size[0]);

数组元素都是0，与SD卡冲突，导致两个盘都显示不出来，但是你屏蔽掉SD相关的代码是可以的，或则屏蔽掉NAND相关代码也是可以的，偏偏两个代码一起的时候不行，检查了半天，才发现问题出在这里。

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