fsmc_nand.c

STM32所有外设例子程序（需自己修改）

* Return         : New status of the NAND operation. This parameter can be:
*                   - NAND_TIMEOUT_ERROR: when the previous operation generate 
*                     a Timeout error
*                   - NAND_READY: when memory is ready for the next operation 
*                  And the new status of the increment address operation. It can be:
*                  - NAND_VALID_ADDRESS: When the new address is valid address
*                  - NAND_INVALID_ADDRESS: When the new address is invalid address
*******************************************************************************/
u32 FSMC_NAND_WriteSpareArea(u8 *pBuffer, NAND_ADDRESS Address, u32 NumSpareAreaTowrite)
{
  u32 index = 0x00, numsparesreawritten = 0x00, addressstatus = NAND_VALID_ADDRESS;
  u32 status = NAND_READY, size = 0x00; 

  while((NumSpareAreaTowrite != 0x00) && (addressstatus == NAND_VALID_ADDRESS) && (status == NAND_READY))
  {
    /* Page write Spare area command and address */
    *(vu8 *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_AREA_C;
    *(vu8 *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_WRITE0;

    *(vu8 *)(Bank_NAND_ADDR | ADDR_AREA) = 0x00; 
    *(vu8 *)(Bank_NAND_ADDR | ADDR_AREA) = ADDR_1st_CYCLE(ROW_ADDRESS); 
    *(vu8 *)(Bank_NAND_ADDR | ADDR_AREA) = ADDR_2nd_CYCLE(ROW_ADDRESS); 
    *(vu8 *)(Bank_NAND_ADDR | ADDR_AREA) = ADDR_3rd_CYCLE(ROW_ADDRESS); 

    /* Calculate the size */ 
    size = NAND_SPARE_AREA_SIZE + (NAND_SPARE_AREA_SIZE * numsparesreawritten);

    /* Write the data */ 
    for(; index < size; index++)
    {
      *(vu8 *)(Bank_NAND_ADDR | DATA_AREA) = pBuffer[index];
    }
    
    *(vu8 *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_WRITE_TRUE1;

    /* Check status for successful operation */
    status = FSMC_NAND_GetStatus();

    if(status == NAND_READY)
    {
      numsparesreawritten++;      

      NumSpareAreaTowrite--;  
    
      /* Calculate Next page Address */
      addressstatus = FSMC_NAND_AddressIncrement(&Address);
    }       
  }
  
  return (status | addressstatus);
}

/******************************************************************************
* Function Name  : FSMC_NAND_ReadSpareArea
* Description    : This routine read the spare area information from the specified
*                  pages addresses.
* Input          : - pBuffer: pointer on the Buffer to fill  
*                  - Address: First page address
*                  - NumSpareAreaToRead: Number of Spare Area to read
* Output         : None
* Return         : New status of the NAND operation. This parameter can be:
*                   - NAND_TIMEOUT_ERROR: when the previous operation generate 
*                     a Timeout error
*                   - NAND_READY: when memory is ready for the next operation 
*                  And the new status of the increment address operation. It can be:
*                  - NAND_VALID_ADDRESS: When the new address is valid address
*                  - NAND_INVALID_ADDRESS: When the new address is invalid address
*******************************************************************************/
u32 FSMC_NAND_ReadSpareArea(u8 *pBuffer, NAND_ADDRESS Address, u32 NumSpareAreaToRead)
{
  u32 numsparearearead = 0x00, index = 0x00, addressstatus = NAND_VALID_ADDRESS;
  u32 status = NAND_READY, size = 0x00;

  while((NumSpareAreaToRead != 0x0) && (addressstatus == NAND_VALID_ADDRESS))
  {     
    /* Page Read command and page address */     
    *(vu8 *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_AREA_C;

    *(vu8 *)(Bank_NAND_ADDR | ADDR_AREA) = 0x00; 
    *(vu8 *)(Bank_NAND_ADDR | ADDR_AREA) = ADDR_1st_CYCLE(ROW_ADDRESS);     
    *(vu8 *)(Bank_NAND_ADDR | ADDR_AREA) = ADDR_2nd_CYCLE(ROW_ADDRESS);     
    *(vu8 *)(Bank_NAND_ADDR | ADDR_AREA) = ADDR_3rd_CYCLE(ROW_ADDRESS);    

    *(vu8 *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_AREA_TRUE1;

    /* Data Read */
    size = NAND_SPARE_AREA_SIZE +  (NAND_SPARE_AREA_SIZE * numsparearearead);
	
    /* Get Data into Buffer */
    for ( ;index < size; index++)
    {
      pBuffer[index] = *(vu8 *)(Bank_NAND_ADDR | DATA_AREA);
    }
    
    numsparearearead++;
    
    NumSpareAreaToRead--;

    /* Calculate page address */           			 
    addressstatus = FSMC_NAND_AddressIncrement(&Address);
  }

  status = FSMC_NAND_GetStatus();

  return (status | addressstatus);
}

/******************************************************************************
* Function Name  : FSMC_NAND_EraseBlock
* Description    : This routine erase complete block from NAND FLASH
* Input          : - Address: Any address into block to be erased
* Output         : None
* Return         : New status of the NAND operation. This parameter can be:
*                   - NAND_TIMEOUT_ERROR: when the previous operation generate 
*                     a Timeout error
*                   - NAND_READY: when memory is ready for the next operation 
*******************************************************************************/
u32 FSMC_NAND_EraseBlock(NAND_ADDRESS Address)
{
  *(vu8 *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_ERASE0;

  *(vu8 *)(Bank_NAND_ADDR | ADDR_AREA) = ADDR_1st_CYCLE(ROW_ADDRESS);
  *(vu8 *)(Bank_NAND_ADDR | ADDR_AREA) = ADDR_2nd_CYCLE(ROW_ADDRESS);
  *(vu8 *)(Bank_NAND_ADDR | ADDR_AREA) = ADDR_3rd_CYCLE(ROW_ADDRESS);
		
  *(vu8 *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_ERASE1; 

  return (FSMC_NAND_GetStatus());
}

/******************************************************************************
* Function Name  : FSMC_NAND_Reset
* Description    : This routine reset the NAND FLASH
* Input          : None
* Output         : None
* Return         : NAND_READY
*******************************************************************************/
u32 FSMC_NAND_Reset(void)
{
  *(vu8 *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_RESET;

  return (NAND_READY);
}

/******************************************************************************
* Function Name  : FSMC_NAND_GetStatus
* Description    : Get the NAND operation status
* Input          : None
* Output         : None
* Return         : New status of the NAND operation. This parameter can be:
*                   - NAND_TIMEOUT_ERROR: when the previous operation generate 
*                     a Timeout error
*                   - NAND_READY: when memory is ready for the next operation    
*******************************************************************************/
u32 FSMC_NAND_GetStatus(void)
{
  u32 timeout = 0x1000000, status = NAND_READY;

  status = FSMC_NAND_ReadStatus(); 

  /* Wait for a NAND operation to complete or a TIMEOUT to occur */
  while ((status != NAND_READY) &&( timeout != 0x00))
  {
     status = FSMC_NAND_ReadStatus();
     timeout --;      
  }

  if(timeout == 0x00)
  {          
    status =  NAND_TIMEOUT_ERROR;      
  } 

  /* Return the operation status */
  return (status);      
}
/******************************************************************************
* Function Name  : FSMC_NAND_ReadStatus
* Description    : Reads the NAND memory status using the Read status command 
* Input          : None
* Output         : None
* Return         : The status of the NAND memory. This parameter can be:
*                   - NAND_BUSY: when memory is busy
*                   - NAND_READY: when memory is ready for the next operation    
*                   - NAND_ERROR: when the previous operation gererates error   
*******************************************************************************/
u32 FSMC_NAND_ReadStatus(void)
{
  u32 data = 0x00, status = NAND_BUSY;

  /* Read status operation ------------------------------------ */
  *(vu8 *)(Bank_NAND_ADDR | CMD_AREA) = NAND_CMD_STATUS;
  data = *(vu8 *)(Bank_NAND_ADDR);

  if((data & NAND_ERROR) == NAND_ERROR)
  {
    status = NAND_ERROR;
  } 
  else if((data & NAND_READY) == NAND_READY)
  {
    status = NAND_READY;
  }
  else
  {
    status = NAND_BUSY; 
  }
  
  return (status);
}

/******************************************************************************
* Function Name  : NAND_AddressIncrement
* Description    : Increment the NAND memory address
* Input          : - Address: address to be incremented.
* Output         : None
* Return         : The new status of the increment address operation. It can be:
*                  - NAND_VALID_ADDRESS: When the new address is valid address
*                  - NAND_INVALID_ADDRESS: When the new address is invalid address
*******************************************************************************/
u32 FSMC_NAND_AddressIncrement(NAND_ADDRESS* Address)
{
  u32 status = NAND_VALID_ADDRESS;
 
  Address->Page++;

  if(Address->Page == NAND_BLOCK_SIZE)
  {
    Address->Page = 0;
    Address->Block++;
    
    if(Address->Block == NAND_ZONE_SIZE)
    {
      Address->Block = 0;
      Address->Zone++;

      if(Address->Zone == NAND_MAX_ZONE)
      {
        status = NAND_INVALID_ADDRESS;
      }
    }
  } 
  
  return (status);
}

/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/