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C8051F 内部Flash读写

2014-01-12 13:13 246 查看
#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;

   }

}
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