fsmc_nor.c

STM32所有外设例子程序（需自己修改）

*                  or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_WriteBuffer(u16* pBuffer, u32 WriteAddr, u32 NumHalfwordToWrite)
{
  NOR_Status status = NOR_ONGOING; 

  do
  {
    /* Transfer data to the memory */
    status = FSMC_NOR_WriteHalfWord(WriteAddr, *pBuffer++);
    WriteAddr = WriteAddr + 2;
    NumHalfwordToWrite--;
  }
  while((status == NOR_SUCCESS) && (NumHalfwordToWrite != 0));
  
  return (status); 
}

/*******************************************************************************
* Function Name  : FSMC_NOR_ProgramBuffer
* Description    : Writes a half-word buffer to the FSMC NOR memory. This function 
*                  must be used only with S29GL128P NOR memory.
* Input          : - pBuffer : pointer to buffer. 
*                  - WriteAddr: NOR memory internal address from which the data 
*                    will be written.
*                  - NumHalfwordToWrite: number of Half words to write.
*                    The maximum allowed value is 32 Half words (64 bytes).
* Output         : None
* Return         : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
*                  or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_ProgramBuffer(u16* pBuffer, u32 WriteAddr, u32 NumHalfwordToWrite)
{       
  u32 lastloadedaddress = 0x00;
  u32 currentaddress = 0x00;
  u32 endaddress = 0x00;

  /* Initialize variables */
  currentaddress = WriteAddr;
  endaddress = WriteAddr + NumHalfwordToWrite - 1;
  lastloadedaddress = WriteAddr;

  /* Issue unlock command sequence */
  NOR_WRITE(ADDR_SHIFT(0x00555), 0x00AA);

  NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055);  

  /* Write Write Buffer Load Command */
  NOR_WRITE(ADDR_SHIFT(WriteAddr), 0x0025);
  NOR_WRITE(ADDR_SHIFT(WriteAddr), (NumHalfwordToWrite - 1));

  /* Load Data into NOR Buffer */
  while(currentaddress <= endaddress)
  {
    /* Store last loaded address & data value (for polling) */
    lastloadedaddress = currentaddress;
 
    NOR_WRITE(ADDR_SHIFT(currentaddress), *pBuffer++);
    currentaddress += 1; 
  }

  NOR_WRITE(ADDR_SHIFT(lastloadedaddress), 0x29);
  
  return(FSMC_NOR_GetStatus(Program_Timeout));
}

/******************************************************************************
* Function Name  : FSMC_NOR_ReadHalfWord
* Description    : Reads a half-word from the NOR memory. 
* Input          : - ReadAddr : NOR memory internal address to read from.
* Output         : None
* Return         : Half-word read from the NOR memory
*******************************************************************************/
u16 FSMC_NOR_ReadHalfWord(u32 ReadAddr)
{
  NOR_WRITE(ADDR_SHIFT(0x00555), 0x00AA); 
  NOR_WRITE(ADDR_SHIFT(0x002AA), 0x0055);  
  NOR_WRITE((Bank1_NOR2_ADDR + ReadAddr), 0x00F0 );

  return (*(vu16 *)((Bank1_NOR2_ADDR + ReadAddr)));
}

/*******************************************************************************
* Function Name  : FSMC_NOR_ReadBuffer
* Description    : Reads a block of data from the FSMC NOR memory.
* Input          : - pBuffer : pointer to the buffer that receives the data read 
*                    from the NOR memory.
*                  - ReadAddr : NOR memory internal address to read from.
*                  - NumHalfwordToRead : number of Half word to read.
* Output         : None
* Return         : None
*******************************************************************************/
void FSMC_NOR_ReadBuffer(u16* pBuffer, u32 ReadAddr, u32 NumHalfwordToRead)
{
  NOR_WRITE(ADDR_SHIFT(0x0555), 0x00AA);
  NOR_WRITE(ADDR_SHIFT(0x02AA), 0x0055);
  NOR_WRITE((Bank1_NOR2_ADDR + ReadAddr), 0x00F0);

  for(; NumHalfwordToRead != 0x00; NumHalfwordToRead--) /* while there is data to read */
  {
    /* Read a Halfword from the NOR */
    *pBuffer++ = *(vu16 *)((Bank1_NOR2_ADDR + ReadAddr));
    ReadAddr = ReadAddr + 2; 
  }  
}

/******************************************************************************
* Function Name  : FSMC_NOR_ReturnToReadMode
* Description    : Returns the NOR memory to Read mode.
* Input          : None
* Output         : None
* Return         : NOR_SUCCESS
*******************************************************************************/
NOR_Status FSMC_NOR_ReturnToReadMode(void)
{
  NOR_WRITE(Bank1_NOR2_ADDR, 0x00F0);

  return (NOR_SUCCESS);
}

/******************************************************************************
* Function Name  : FSMC_NOR_Reset
* Description    : Returns the NOR memory to Read mode and resets the errors in
*                  the NOR memory Status Register.
* Input          : None
* Output         : None
* Return         : NOR_SUCCESS
*******************************************************************************/
NOR_Status FSMC_NOR_Reset(void)
{
  NOR_WRITE(ADDR_SHIFT(0x00555), 0x00AA); 
  NOR_WRITE(ADDR_SHIFT(0x002AA), 0x0055); 
  NOR_WRITE(Bank1_NOR2_ADDR, 0x00F0); 

  return (NOR_SUCCESS);
}

/******************************************************************************
* Function Name  : FSMC_NOR_GetStatus
* Description    : Returns the NOR operation status.
* Input          : - Timeout: NOR progamming Timeout
* Output         : None
* Return         : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
*                  or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_GetStatus(u32 Timeout)
{ 
  u16 val1 = 0x00, val2 = 0x00;
  NOR_Status status = NOR_ONGOING; 
  u32 timeout = Timeout;

  /* Poll on NOR memory Ready/Busy signal ------------------------------------*/
  while((GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_6) != RESET) && (timeout > 0)) 
  {
    timeout--;
  }

  timeout = Timeout;
  
  while((GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_6) == RESET) && (timeout > 0))   
  {
    timeout--;
  }
  
  /* Get the NOR memory operation status -------------------------------------*/
  while((Timeout != 0x00) && (status != NOR_SUCCESS))
  {
    Timeout--;

	  /* Read DQ6 and DQ5 */
    val1 = *(vu16 *)(Bank1_NOR2_ADDR);
    val2 = *(vu16 *)(Bank1_NOR2_ADDR);

    /* If DQ6 did not toggle between the two reads then return NOR_Success */
    if((val1 & 0x0040) == (val2 & 0x0040)) 
    {
      return NOR_SUCCESS;
    }

    if((val1 & 0x0020) != 0x0020)
    {
      status = NOR_ONGOING;
    }

    val1 = *(vu16 *)(Bank1_NOR2_ADDR);
    val2 = *(vu16 *)(Bank1_NOR2_ADDR);
    
    if((val1 & 0x0040) == (val2 & 0x0040)) 
    {
      return NOR_SUCCESS;
    }
    else if((val1 & 0x0020) == 0x0020)
    {
      return NOR_ERROR;
    }
  }

  if(Timeout == 0x00)
  {
    status = NOR_TIMEOUT;
  } 

  /* Return the operation status */
  return (status);
}

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