C8051F 内部Flash读写

#include "Head.h"


//-----------------------------------------------------------------------------
// FLASH_ByteWrite
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   :
//   1) FLADDR addr - address of the byte to write to
//                    valid range is 0x0000 to 0xFBFF for 64K Flash devices
//                    valid range is 0x0000 to 0x7FFF for 32K Flash devices
//   2) U8 byte - byte to write to Flash.
//
// This routine writes <byte> to the linear FLASH address <addr>.
//-----------------------------------------------------------------------------
U8 Flash_data[30];


void FLASH_ByteWrite (FLADDR addr, U8 byte)
{
   bit EA_SAVE = EA;                   // Preserve EA
   U8 xdata * data pwrite;             // FLASH write pointer


   U8 SFRPAGE_save = SFRPAGE;
   SFRPAGE = ACTIVE_PAGE;


   EA = 0;                             // Disable interrupts


   VDM0CN = 0xA0;                      // Enable VDD monitor and high threshold


   RSTSRC = 0x02;                      // Enable VDD monitor as a reset source


   pwrite = (U8 xdata *) addr;


   FLKEY  = 0xA5;                      // Key Sequence 1
   FLKEY  = 0xF1;                      // Key Sequence 2
   PSCTL |= 0x01;                      // PSWE = 1 which enables writes


   VDM0CN = 0xA0;                      // Enable VDD monitor and high threshold


   RSTSRC = 0x02;                      // Enable VDD monitor as a reset source


   *pwrite = byte;                     // Write the byte


   PSCTL &= ~0x01;                     // PSWE = 0 which disable writes


   EA = EA_SAVE;                       // Restore interrupts


   SFRPAGE = SFRPAGE_save;
}


//-----------------------------------------------------------------------------
// FLASH_ByteRead
//-----------------------------------------------------------------------------
//
// Return Value :
//      U8 - byte read from Flash
// Parameters   :
//   1) FLADDR addr - address of the byte to read to
//                    valid range is 0x0000 to 0xFBFF for 64K Flash devices
//                    valid range is 0x0000 to 0x7FFF for 32K Flash devices
//
// This routine reads a <byte> from the linear FLASH address <addr>.
//-----------------------------------------------------------------------------


U8 FLASH_ByteRead (FLADDR addr)
{
   bit EA_SAVE = EA;                   // Preserve EA
   U8 code * data pread;               // FLASH read pointer
   U8 byte;


   EA = 0;                             // Disable interrupts


   pread = (U8 code *) addr;


   byte = *pread;                      // Read the byte


   EA = EA_SAVE;                       // Restore interrupts


   return byte;
}


//-----------------------------------------------------------------------------
// FLASH_PageErase
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   :
//   1) FLADDR addr - address of any byte in the page to erase
//                    valid range is 0x0000 to 0xF9FF for 64K Flash devices
//                    valid range is 0x0000 to 0x7DFF for 32K Flash devices
//
// This routine erases the FLASH page containing the linear FLASH address
// <addr>.  Note that the page of Flash containing the Lock Byte cannot be
// erased from application code.
//-----------------------------------------------------------------------------


void FLASH_PageErase (FLADDR addr)
{
   bit EA_SAVE = EA;                   // Preserve EA
   U8 xdata * data pwrite;             // FLASH write pointer


   U8 SFRPAGE_save = SFRPAGE;
   SFRPAGE = ACTIVE_PAGE;


   EA = 0;                             // Disable interrupts


   VDM0CN = 0xA0;                      // Enable VDD monitor and high threshold


   RSTSRC = 0x02;                      // Enable VDD monitor as a reset source


   pwrite = (U8 xdata *) addr;


   FLKEY  = 0xA5;                      // Key Sequence 1
   FLKEY  = 0xF1;                      // Key Sequence 2
   PSCTL |= 0x03;                      // PSWE = 1; PSEE = 1


   VDM0CN = 0xA0;                      // Enable VDD monitor and high threshold


   RSTSRC = 0x02;                      // Enable VDD monitor as a reset source


   *pwrite = 0;                        // Initiate page erase


   PSCTL &= ~0x03;                     // PSWE = 0; PSEE = 0


   EA = EA_SAVE;                       // Restore interrupts


   SFRPAGE = SFRPAGE_save;
}


void FLASH_ReadData(U8 *buffer,U8 length) 
{
   U8 i;
   for(i = 0; i < length ; i++){
    buffer[i] = FLASH_ByteRead (start_address + i);
   }
   
}


void FLASH_WriteData(U8 *buffer,U8 length) 
{
   U8 i;
   for(i = 0; i < length; i ++){
    FLASH_PageErase(start_address + i);
   }
   for(i = 0; i < length; i ++){  
    FLASH_ByteWrite (start_address + i, buffer[i]);
   }
}


void Flash_data_init()
{
   U8 i;
   for(i = 0; i < 30; i++){
    Flash_data[i] = 0x00;
   }
}