Writing to flash

I recommend this application note and library for the beginning. The dsPIC30F chips have dedicated EEPROM which can be used in a more straightforward way than emulation.There are special builtin functions in C30 which simpify the Flash read/write handling - __builtin_tblrdX(), __builtin_tblwtX(). They are documented in C30 User's Manual.

Hello,
Before using the emulation library, i would like to understand what is wrong in my code since i simply copied what i found either in C30 guide or in PIC24F Datasheets

PROG_Read is fine and works !
PROG_Write and PROG_Erase do not ?!

Any body to help me ? thank's a lot in advance
Philippe


int   __attribute__ (( aligned (4), space (prog) )) FailSafe1 = 1;

/*---------------------------------------------------------------------------*/
void     PROG_Write(int data)
{
int offset;
int i ;


   // Set up NVMCON to write one word of data EEPROM
   NVMCON = 0x4003;

   // Set up a pointer to the EEPROM location to be written
   __builtin_tblpage(&FailSafe1);
   offset = __builtin_tbloffset(&FailSafe1);

   // Write Data Value To Holding Latch
   __builtin_tblwtl(offset, data);

   // Disable Interrupts For 5 Instructions
   asm volatile ("disi #5");

   // Issue Unlock Sequence & Start Write Cycle
   __builtin_write_NVM();
}
/*---------------------------------------------------------------------------*/
void     PROG_Erase()
{
int offset;


   // Set up NVMCON to erase one word of data EEPROM
   NVMCON = 0x4043;

   // Set up a pointer to the EEPROM location to be erased
   __builtin_tblpage(&FailSafe1);
   offset = __builtin_tbloffset(&FailSafe1);

   __builtin_tblwtl(offset, 0XFFFF);

   // Disable Interrupts For 5 Instructions
   asm volatile ("disi #5");
   // Issue Unlock Sequence & Start Write Cycle
   __builtin_write_NVM();
}
/*---------------------------------------------------------------------------*/
void     PROG_Read()
{
int offset;
int data,i ;

   // Set up a pointer to the EEPROM location to be read
   __builtin_tblpage(&FailSafe1);
   offset = __builtin_tbloffset(&FailSafe1);

   // Read the EEPROM data
   data = __builtin_tblrdl(offset);

}

Hello,
i gave a complete new working code on C30 compiler forum for writing to flash on PIC24F
Philippe