Paul C wrote:
>Hi everybody,
>I have problem with recalling the value of the registers.  For example,
>ihave this  initial part code
>
>  list p=16f877
>  include "p16f877.inc"
>
>  __CONFIG _CP_OFF & _WDT_OFF & _BODEN_ON & _PWRTE_ON & _HS_OSC &
> _WRT_ENABLE_ON & _LVP_ON & _DEBUG_OFF & _CPD_OFF
>         clr_desplay     equ       H'26'
>         curs_home      equ      H'27'
>         set_mode        equ      H'28'
>         display_on      equ      H'29'     ; I am reading this value
> b'00101001'
>         curser_shft      equ      H'2A'
>         func_set          equ      H'2B'
>         org       0x0000
>         nop
>
>start
>         movlw       b'00000001'   ;put 1 in register clr_desplay
>         movwf      clr_desplay
>         movlw       b'00000011'   ;
>         movwf       curs_home
>         movlw       b'00000111'   ;
>         movwf      set_mode
>         movlw      b'00001111'   ;
>         movwf      display_on
>         movlw      b'00011111'    ;
>   &nbs
>p;     movwf      curser_shft
>         movlw      b'00111000'    ;
>         movwf      func_set
>
>  clrf  PORTA
>  clrf  PORTB
>  clrf  PORTC
>  clrf  PORTD
>  clrf  PORTE
>  bsf  STATUS,5  ; RAM Page 1
>  clrf  TRISA
>  clrf  TRISB
>  clrf  TRISC
>  clrf  TRISD
>  clrf  TRISE
>;
>; -------------------------
>; SET ANALOG/DIGITAL INPUTS
>; -------------------------
>;
>  movlw       b'00000110' ; = all digital
>  movwf      ADCON1
>  bcf            STATUS,5
>; i removed all the delays needed
>main
>              call       pic_init
>              call       lcd_cmd
>pic_init
>               nop
>               bcf       STATUS,5
>               clrf       PORTA
>               clrf       PORTD
>               clrf       PORTB
>               bsf       STATUS,5
>               movlw      00h                      ; set PORTD all
>     &
>
>nbsp;         movwf     TRISD                 ; output
>               movlw      B'11111100'         ; set RA0 and RA1
>               movwf     TRISA                 ; output
>               movlw      B'11111111'         ; set PORTB all
>               movwf     TRISB               &nbs
>p; ; input
>               bcf           STATUS,5          ;
>               return
>pic_cmd
>         nop
>(1)             movlw       display_on           ; send 00001111

You are moving the *location* of the ram into w by doing the above!
Use "movf display_on,f" to move the *value* of it into w.

>(2)            movwf       PORTD              ; to port d
>(3)             call            com_set
>
>(4)             movlw       func_set              ; send 001110000

Same here!

>  (5)            movwf       PORTD      &
>
>nbsp;       ; to port d
>  (6)            call            com_set
>
>  (7)            movlw       clr_desplay          ; send 000000001

And again!

>(8)             movwf       PORTD              ; to port d
>(9)             call             com_set
>              return
>com_set
>              bcf             PORTA,1           ; comand mode
>; call lcd_delay2
>              bsf             PORTA,0           ; set enable high
>; call lcd_delay2
>             bcf             PORTA,0            ; set enable low
>; call lcd_delay2
>             return
>
>the problem here is that i am reading the register number or its place in
>the memory not its value.
>Line (1) for example should put the value of register desplay_on which is
>00001111 to w register and then to port D.  However, I am reading 00101001
>instead which i don't have any idea why.

I haven't checked anything else to see if it all makes sense but this is a
start.
BTW Paul, please don't post in html as it makes if a lot harder to read. :-(
Hope this helps you with your project.
Regards...

___________________________________________
David Duffy        Audio Visual Devices P/L
U8, 9-11 Trade St, Cleveland 4163 Australia
Ph: +61 7 38210362   Fax: +61 7 38210281
New Web: www.audiovisualdevices.com.au
New email: avd@audiovisualdevices.com.au
___________________________________________

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