STM32使用fsmc控制NOR flash 例程（4） flash, entire

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/*******************************************************************************
* Function Name  : FSMC_NOR_EraseChip
* Description    : Erases the entire chip.
* Input          : None                     
* Output         : None
* Return         : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
*                  or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_EraseChip(void)
{
  NOR_WRITE(ADDR_SHIFT(0x05555), 0x00AA);
  NOR_WRITE(ADDR_SHIFT(0x02AAA), 0x0055);
  NOR_WRITE(ADDR_SHIFT(0x05555), 0x0080);
  NOR_WRITE(ADDR_SHIFT(0x05555), 0x00AA);
  NOR_WRITE(ADDR_SHIFT(0x02AAA), 0x0055);
  NOR_WRITE(ADDR_SHIFT(0x05555), 0x0010);
  return (FSMC_NOR_GetStatus(ChipErase_Timeout));
}
/******************************************************************************
* Function Name  : FSMC_NOR_WriteHalfWord
* Description    : Writes a half-word to the NOR memory.
* Input          : - WriteAddr : NOR memory internal address to write to.
*                  - Data : Data to write.
* Output         : None
* Return         : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
*                  or NOR_TIMEOUT
*******************************************************************************/
NOR_Status FSMC_NOR_WriteHalfWord(u32 WriteAddr, u16 Data)
{
  NOR_WRITE(ADDR_SHIFT(0x05555), 0x00AA);
  NOR_WRITE(ADDR_SHIFT(0x02AAA), 0x0055);
  NOR_WRITE(ADDR_SHIFT(0x05555), 0x00A0);
  NOR_WRITE((Bank1_NOR2_ADDR + WriteAddr), Data);
  return (FSMC_NOR_GetStatus(Program_Timeout));
}
/*******************************************************************************
* Function Name  : FSMC_NOR_WriteBuffer
* Description    : Writes a half-word buffer to the FSMC 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.
* Output         : None
* Return         : NOR_Status:The returned value can be: NOR_SUCCESS, NOR_ERROR
*                  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(0x005555), 0x00AA);
  NOR_WRITE(ADDR_SHIFT(0x02AAA), 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));
}