PIC16F677 and READ/WRITE

Hi all,
I've been using both 16F677 and 16f685 chips as availability allowed with same program without any problems until I introduced the READ and WRITE functions on the 16F677.
I get the error: Error[113]: Symbol not previously defined (EEPGD)
The data sheet shows:

Quote:

10.1.1 EECON1 AND EECON2 REGISTERS EECON1 is the control register for EE memory accesses. Control bit EEPGD (PIC16F685/PIC16F689/PIC16F690) determines if the access will be a program or data memory access.

And also when referring to EECON1.7:

Quote:

Note 1: PIC16F685/PIC16F689/PIC16F690 only.

I stripped the code down to a minimum to compile with READ and WRITE commented out or not to see if it compiles without error using PICBasic Pro 2.47 and MPASM.

This is only a sample routine to demo the compilation error. I hope that someone can shed some light on this.

Code:

'************************************************************************* @ __config _INTRC_OSC_NOCLKOUT & _WDT_OFF & _MCLRE_OFF & _CP_ON & _BOR_OFF OSCCON = %01001000 ' Oscillator set to 1MHz PORTA = %00000000 ' Turn off all PORTA ANSEL = 0 ' Sets all PORTA inputs to digital inputs TRISA = %00011111 ' Sets all PORTA pins as inputs except RA5 PORTB = %00000000 ' Turn off all PORTB ANSELH = 0 ' Sets analog inputs 8 ~ 11 to digital inputs TRISB = %10000000 ' Sets RB4~6 as outputs and RB7 as input PORTC = %00000000 ' Turn off all PORTC TRISC = %00000000 ' Sets all PORTC pins as outputs CM1CON0.7 = 0 ' Analog comparator #1 off CM1CON0.5 = 0 ' Comparator #1 output disabled CM2CON0.7 = 0 ' Analog comparator #2 off CM2CON0.5 = 0 ' Comparator #0 output disabled ADCON0 = 0 ' A/D OFF OPTION_REG.7 = 1 ' Global weak pull-up enable bit enabled WPUA = %00010111 ' Weak pull-ups enable on PORTA inputs WPUB = %00000000 ' Weak pull-ups disabled on PORTB inputs '========================================================================= ' Variables '========================================================================= x VAR BYTE '========================================================================= ' Set EEPROM default value at location 2 for 2 Modes at initial program ' then this value is user selectable via Mode button. '========================================================================= EEPROM 2, [2] PAUSE 10 '========================================================================= ' Test loop '========================================================================= x = 7 loop: READ 2, x PAUSE 10 ' WRITE 2, x PAUSE 10 GOTO loop END

Thank you all for your input...

Problem solved?

I guess this was a tough one and don't feel so bad now. After researching and more searching it became obvious.
Even though the PIC16F677 has 256 bytes of EEPROM availble but I can't use it because it seems the compiler is trying to use EEPGD that is only used in the rest of the series... Don't use it!
The PIC16F685, 687, 689 & 690 are only around $0.25 more. Problem solved. :rolleyes:

The need was sure to come back...

Well as it turns out, just avoiding the problem did not solve it.:rolleyes:
The PIC16F685 does not provide the SSP hardware I'll be needing now so more searching found Darrel's guidance (thanks again Darrel!) http://www.picbasic.co.uk/forum/showthread.php?t=12424
So comparing both INC files shows that the PIC16F677 was missing the EEPGD in the BANK 3 Register:

portion of PIC16F685 INC file:

Code:

;----- BANK 3 REGISTER DEFINITIONS ---------------------------------------- ;----- EECON1 ------------------------------------------------------------- EEPGD EQU H'0007' WRERR EQU H'0003' WREN EQU H'0002' WR EQU H'0001' RD EQU H'0000'

same section of PIC16F677 INC file:

Code:

;----- BANK 3 REGISTER DEFINITIONS ---------------------------------------- ;----- EECON1 ------------------------------------------------------------- WRERR EQU H'0003' WREN EQU H'0002' WR EQU H'0001' RD EQU H'0000'

Updated to:

Code:

;----- BANK 3 REGISTER DEFINITIONS ---------------------------------------- ;----- EECON1 ------------------------------------------------------------- EEPGD EQU H'0007' ; Added 11/8/2010 WRERR EQU H'0003' WREN EQU H'0002' WR EQU H'0001' RD EQU H'0000'

Compiled without errors and I can now use the EEPROM in the PIC16F677!

A big Thank You! to all who contribute their expertise and time to help others along.

Hi Louie,

I'm glad you got it working, although I'm not sure how my other post helped. :o

Would it help if I mentioned that 2.47 was the first time that family was included in PBP.
And the 677 EEPROM issue was fixed in PBP version 2.50?

OK, probably not ... :)
________________
DT
http://www.pbpgroup.com/files/SIGIMG/Upgrade.gif

Quote:

Would it help if I mentioned that 2.47 was the first time that family was included in PBP.
And the 677 EEPROM issue was fixed in PBP version 2.50?

Actually it does...
It confirms I need to stop dragging my feet and dig out my receipt for Bruce so I can update!