assembler errors

hi,m learning pic basic pro programming and i developed code which will turn on 8 LEDs which are connected to PORTB of a PIC microcontroller.When the project is started (or when reset), the LEDs scroll to the right with a 250ms delay between each output. The sample code developed is as follows

j var byte 'define variable jam as byte type
trisb=0 'set port direction
mwanzo: 'start of the loop
j=128 'initialize counter
while j<1
PORTB=j 'send the counter value to the port
pause 250 'delay for 250ms
j=j>>1 'shift right once
wend
goto mwanzo 'repeat once again
end

when i compiled the program on MCS IDE i with pic16f877 selected i get the following errors:

Error LED_SC~1.ASM 48:[255] undifined symbol 'chk?rp'
Error LED_SC~1.ASM 48:[255] undifined symbol 'move?cb'
Error LED_SC~1.ASM 52:[231] attempt to redifine 'label?l'
Error LED_SC~1.ASM 51:[255] undifined symbol 'chk?rp'
Error LED_SC~1.ASM 51:[255] undifined symbol 'move?cb'
Error LED_SC~1.ASM 52:[231] attempt to redifine 'label?l'
Error LED_SC~1.ASM 53:[255] undifined symbol 'cpmge?bcl'
Fatal LED_SC~1.ASM 53:[300] to many errors

when i change the pic selection to 16f628 the program run successful!!but development board im using have pic16f877 and i got the same type of errors in other programs i developed although some other program compiled secessfully. I need help on this

Those are the standard Library macro's.
Have you edited your 16F877.bas file for any reason?
Were there any other errors BEFORE those?

Make sure your c:\pbp\16f877.bas file looks like this ...

Code:

---

'****************************************************************
'*  16F877.BAS                                                  *
'*                                                              *
'*  By        : Leonard Zerman, Jeff Schmoyer                  *
'*  Notice    : Copyright (c) 1998 microEngineering Labs, Inc.  *
'*              All Rights Reserved                            *
'*  Date      : 10/23/98                                        *
'*  Version  : 2.11                                            *
'*  Notes    :                                                *
'****************************************************************

BANK0  $0020, $007F
BANK1  $00A0, $00EF
BANK2  $0110, $016F
BANK3  $0190, $01EF
EEPROM  $2100, $21FF
LIBRARY "PBPPIC14"
DEFINE  CODE_SIZE 8

        include "PIC14EXT.BAS"

PORTL  VAR    PORTB
PORTH  VAR    PORTC
TRISL  VAR    TRISB
TRISH  VAR    TRISC

        include "PBPPIC14.RAM"

'*-----------------------* EOF 16F877.BAS *---------------------*

---

And your program won't work, because j will never be less than 1 and the WHILE won't execute.

Thanx Darren, I've not changed the 16f877.bas file and i had only syntax error before the assembler errors occurred. The 16f877.bas looks the same as yours.i have changed the loop but still the same errors occur. the code is

j var byte 'define variable j as byte type
trisb=0 'set portb direction
mwanzo: 'start of the main program
j=128 'initialize counter
again: 'start of the loop
PORTB=j 'send the counter value to the port
pause 250 'delay for 250ms
if j=1 then mwanzo
j=j>>1 'shift right once
goto again 'repeat once again
end

i wonder why the same errors still persist...i need more help on this

Could you email the .LST file after a failed compile?

[email protected]