Hi

I try to read the flash ROM of my PIC16F916 to calculate a checksum.
I use the MPLAB and the PICC v9.83 Compiler.

I tried this c function:

unsigned int ReadFlash( unsigned int address ) {
   EEADRL =3D address%256;
   EEADRH =3D address/256;
   EEPGD =3D 1; // program memory
   RD =3D 1;    // read
   ;
   ;
   return EEDATH*256 + EEDATL;
}

and everything in assembler:

unsigned char low3;
unsigned char high3;

unsigned int dataFlash;

void main() {

   #asm
      BCF        _STATUS, 5
      BCF        _STATUS, 6
      MOVF       _low3, W
      BSF        _STATUS, 6
      MOVWF      _EEADR
      BCF        _STATUS, 6
      MOVF       _high3, W
      BSF        _STATUS, 6
      MOVWF      _EEADRH
      BSF        _STATUS, 5
      BSF        _EECON1, 7
      BSF        _EECON1, 0
      NOP
      NOP
      BCF        _STATUS, 5
      MOVF       _EEDATH, W
      MOVWF      _dataFlash+1
      CLRF       _dataFlash
      MOVF       _EEDATA, W
      IORWF      _dataFlash, F
      MOVLW      0=20
      IORWF      _dataFlash+1, F
   #endasm
}

But both are not working, if I debug it most of the time the register EEDAT=
A
and EEDATH have the right value. But if I copy it to the variable dataFlash
it is 0.

With the mikroC compiler is a function to read the flash that works. But I
can not use this compiler because the build hex file is much bigger and has
no space on the PIC.

Any idea what is wrong or how I can read the flash ROM?

thanks

Adrian
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