Hello,

    I've implemented these two functions in CCS:

----- START of CCS code

#define RP0   5
#define RP1   6
#define EEPGD 7
#define WRERR 3
#define WREN  2
#define WR    1
#define RD    0
#define GIE   7

uns16 program_address;
uns16 program_data;

void write_program(void)
{
#ASM
 BSF   STATUS, RP1
 BCF   STATUS, RP0 // Bank 2

 MOVF  &program_address, W
 MOVWF EEADR
 MOVF  &program_address + 1, W
 MOVWF EEADRH  // move address

 MOVF  &program_data, W
 MOVWF EEDATA
 MOVF  &program_data + 1, W
 MOVWF EEDATAH  // move data

 BSF   STATUS, RP0 // Bank 3

 BSF   EECON1, EEPGD // Point to PROGRAM memory
 BSF   EECON1, WREN // Enable writes
 BCF   INTCON, GIE // Disable interrupts

 MOVLW 0x55
 MOVWF EECON2  // Write 55h

 MOVLW 0xAA
 MOVWF EECON2  // Write AAh

 BSF   EECON1, WR // Set WR bit to begin write
 NOP     // Instruction here is ignored
 NOP     // Instruction here is ignored

 BSF   INTCON, GIE // Enable interrupts
 BCF   EECON1, WREN  // Disables writes
#ENDASM
}

void read_program(void)
{
#ASM
 BSF   STATUS, RP1
 BCF   STATUS, RP0 // Bank 2

 MOVF  &program_address, W
 MOVWF EEADR
 MOVF  &program_address + 1, W
 MOVWF EEADRH  // move address

 BSF   STATUS, RP0 // Bank 3

 BSF   EECON1, EEPGD // Point to PROGRAM memory
 BSF   EECON1, WR // Set RD bit to begin read

 NOP     // Instruction here is ignored
 NOP     // Instruction here is ignored

 BCF   STATUS, RP0 // Bank 2

 MOVF  EEDATA, W
 MOVWF &program_data
 MOVF  EEDATAH, W
 MOVWF (&program_data + 1) // move data
#ENDASM
}

----- END of CCS code

    Anyone can help me find out why this isn't working?

    To write, put ADDRESS in 'program_address' variable and put DATA in
'program_data' variable, then execute 'write_program()'.

    To read, put ADDRESS in 'program_address', execute 'read_program()' and
data will be load in 'program_data' variable.

    Well, it's supposed to work this way... :(

    Best regards and thanks,

    Brusque




____________________________________________________________________
Get free email and a permanent address at http://www.netaddress.com/?N=1