16F1829 - when compliled/program error!

[Anobium]

I am now building my robot and I have found an issue in the compiler.

I am controlling a L293d but it was not working. Ports on the PortC device are staying HIGH.  I have simplied the code to reproduce the error.

In the code below Portc.1 is turned on, and should not turn off but when programmed it does.  The ASM is below.

#chip 16F1829, 4
#config osc = xt, MCLRE_OFF
dir PORTC.0 out
dir PORTC.1 out
dir PORTC.3 out
Dir PORTC.4 out
    set PORTC.3 ON
  Set PORTC.4 ON
  wait 1 s
do
    SET PORTC.4 OFF
  SET PORTC.3 ON
  SET PORTC.1 ON
'  PORTC.0 = 0
  wait 1 s
    SET PORTC.4 ON
  SET PORTC.3 ON
    'PORTC.1 = 0
'  PORTC.0 = 1
  Wait 1 s
loop

ASM

;Program compiled by Great Cow BASIC (0.9 5/11/2012)
;Need help? See the GCBASIC forums at http://sourceforge.net/projects/gcbasic/forums,
;check the documentation or email w_cholmondeley at users dot sourceforge dot net.
;********************************************************************************
;Set up the assembler options (Chip type, clock source, other bits and pieces)
 LIST p=16F1829, r=DEC
#include <P16F1829.inc>
 __CONFIG _CONFIG1, _MCLRE_OFF & _WDTE_OFF & _FOSC_XT
 __CONFIG _CONFIG2, _LVP_OFF & _PLLEN_OFF
;********************************************************************************
;Set aside memory locations for variables
DELAYTEMP   EQU 112
DELAYTEMP2  EQU 113
SysWaitTempMS   EQU 114
SysWaitTempMS_H EQU 115
SysWaitTempS    EQU 116
;********************************************************************************
;Vectors
    ORG 0
    goto    BASPROGRAMSTART
    ORG 4
    retfie
;********************************************************************************
;Start of program memory page 0
    ORG 5
BASPROGRAMSTART
;Call initialisation routines
    call    INITSYS
;Start of the main program
;dir PORTC.0 out
    banksel TRISC
    bcf TRISC,0
;dir PORTC.1 out
    bcf TRISC,1
;dir PORTC.3 out
    bcf TRISC,3
;Dir PORTC.4 out
    bcf TRISC,4
;set PORTC.3 ON
    banksel PORTC
    bsf PORTC,3
;Set PORTC.4 ON
    bsf PORTC,4
;wait 1a s
    movlw   1
    movwf   SysWaitTempS
    call    Delay_S
;do
SysDoLoop_S1
;SET PORTC.4 OFF
    bcf PORTC,4
;SET PORTC.3 ON
    bsf PORTC,3
;SET PORTC.1 ON
    bsf PORTC,1
;PORTC.0 = 0
;wait 1 s
    movlw   1
    movwf   SysWaitTempS
    call    Delay_S
;SET PORTC.4 ON
    bsf PORTC,4
;SET PORTC.3 ON
    bsf PORTC,3
;PORTC.0 = 1
;Wait 1 s
    movlw   1
    movwf   SysWaitTempS
    call    Delay_S
;loop
    goto    SysDoLoop_S1
SysDoLoop_E1
BASPROGRAMEND
    sleep
    goto    BASPROGRAMEND
;********************************************************************************
Delay_MS
    incf    SysWaitTempMS_H, F
DMS_START
    movlw   142
    movwf   DELAYTEMP2
DMS_OUTER
    movlw   1
    movwf   DELAYTEMP
DMS_INNER
    decfsz  DELAYTEMP, F
    goto    DMS_INNER
    decfsz  DELAYTEMP2, F
    goto    DMS_OUTER
    decfsz  SysWaitTempMS, F
    goto    DMS_START
    decfsz  SysWaitTempMS_H, F
    goto    DMS_START
    return
;********************************************************************************
Delay_S
DS_START
    movlw   232
    movwf   SysWaitTempMS
    movlw   3
    movwf   SysWaitTempMS_H
    call    Delay_MS
    decfsz  SysWaitTempS, F
    goto    DS_START
    return
;********************************************************************************
INITSYS
;OSCCON = OSCCON AND b'10000111'
    movlw   135
    banksel OSCCON
    andwf   OSCCON,F
;OSCCON = OSCCON OR b'01101000'
    movlw   104
    iorwf   OSCCON,F
;SET ADCON0.ADON OFF
    bcf ADCON0,ADON
;SET ADFM OFF
    bcf ADCON1,ADFM
;ANSELA = 0
    banksel ANSELA
    clrf    ANSELA
;ANSELB = 0
    clrf    ANSELB
;C2ON = 0
    banksel CM2CON0
    bcf CM2CON0,C2ON
;C1ON = 0
    bcf CM1CON0,C1ON
;PORTA = 0
    banksel PORTA
    clrf    PORTA
;PORTB = 0
    clrf    PORTB
;PORTC = 0
    clrf    PORTC
    return
;********************************************************************************
;Start of program memory page 1
    ORG 2048
;Start of program memory page 2
    ORG 4096
;Start of program memory page 3
    ORG 6144
 END

[Chuck Hellebuyck]

You may be experiencing the Read Modify Write issue. Instead of writing to PORTC write to LATC.
i.e.
set LATC.3 ON

[Anobium]

I will give this a try and test.