Koh Teik Siong wrote:
>
> Hi Guys:
>         Thanks for the info you gave me. It help me to solve my problem. I
> managed to get the program working in the simulator.
>         However, when I burn in the program into the PIC17C44, I could not get
> the output from PORTD when I changed the input of PORTC!!! Strange! I
> wonder if there's anything to do with my way of writing my program. I've
> attached my program as a text file and another one is the error text.
>         Also when I contact up the cct, I grounded both Vss, Vdd to 5V and a
> external clock source(programmable one) to osc1. That's all. And, for
> the input, it's to the switches.....the output, it's to the LEDS.
>         That's all...
>
> ....."The journey of a thousand miles begins with a
> small step in the right direction.".......
>
> ----------------------------
> Name    : Koh Teik Siong
> Email   : tsk196@soton.ac.uk
> Tel     : +44 (01703) 766255
> Address : Flat 4 Rm 19
>           Beechmount House
>           Beechmount Rd
>           Bassett
>           Southampton
>           SO16 3JD
> -----------------------------
>
>     ---------------------------------------------------------------
> ;***********************************************************
> ;               DIGITAL TO ANALOG CONVERTER
> ;
> ;       This program converts the digital signal -128 to 127
> ;to give a output voltage of -10V to 10V. This is to control
> ;the voltage of the motor so that it can rotate the motor to
> ;the desire speed and position.
> ;
> ;***********************************************************
>
>         list    P=17C44, r=hex
>
>
>
> ddrc    equ     0x0110 ; I've also tried to use address 0x10
> portc   equ     0x0111 ; I've also tried to use address 0x10
> ddrd    equ     0x0112 ; I've also tried to use address 0x10
> portd   equ     0x0113; I've also tried to use address 0x10
> w       equ     0x000A
> count   equ     0x0020
>
>         ORG     0x0000
>         GOTO    START
>
> START
> DELAY   macro   count
>         VARIABLE I
> I = 0
>         WHILE I < count
> I += 1
>         ENDW
>         ENDM
>
>         CALL    INIT
>
> LOOP    MOVLB   1
>         movpf   portc,portd     ;GET DATA
>         DELAY   100             ;O/P TO PORTD
>         GOTO    LOOP            ;
>
> INIT    MOVLB   1       ;MOVE TO BANK 1
>         CLRF    portc,1 ;INIT PORTC
>         setf    ddrc,1  ;PORTC IS I/P
>
>         clrF    portd,1 ;INIT PORTD
>         clrf    ddrd,1  ;PORTD IS O/P
>         MOVLB   0       ;MOVE TO BANK 0
>         RETURN
>         END
>
>     ---------------------------------------------------------------
> Warning[202] C:\MPLAB\TUTOR\DAC.ASM 37 : Argument out of range.  Least
 significant bits used.
> Message[302] C:\MPLAB\TUTOR\DAC.ASM 37 : Register in operand not in bank 0.
 Ensure that bank bits are correct.
> Message[302] C:\MPLAB\TUTOR\DAC.ASM 42 : Register in operand not in bank 0.
 Ensure that bank bits are correct.
> Message[302] C:\MPLAB\TUTOR\DAC.ASM 43 : Register in operand not in bank 0.
 Ensure that bank bits are correct.
> Message[302] C:\MPLAB\TUTOR\DAC.ASM 45 : Register in operand not in bank 0.
 Ensure that bank bits are correct.
> Message[302] C:\MPLAB\TUTOR\DAC.ASM 46 : Register in operand not in bank 0.
 Ensure that bank bits are correct.

--
....."The journey of a thousand miles begins with a
small step in the right direction.".......

----------------------------
Name    : Koh Teik Siong
Email   : tsk196@soton.ac.uk
Tel     : +44 (01703) 766255
Address : Flat 4 Rm 19
          Beechmount House
          Beechmount Rd
          Bassett
          Southampton
          SO16 3JD
-----------------------------

;***********************************************************
;               DIGITAL TO ANALOG CONVERTER
;
;       This program converts the digital signal -128 to 127
;to give a output voltage of -10V to 10V. This is to control
;the voltage of the motor so that it can rotate the motor to
;the desire speed and position.
;
;***********************************************************

        list    P=17C44, r=hex



ddrc    equ     0x0110 ; I've also tried to use address 0x10
portc   equ     0x0111 ; I've also tried to use address 0x11
ddrd    equ     0x0112 ; I've also tried to use address 0x12
portd   equ     0x0113 ; I've also tried to use address 0x13
w       equ     0x000A
count   equ     0x0020

        ORG     0x0000
        GOTO    START

START
DELAY   macro   count
        VARIABLE I
I = 0
        WHILE I < count
I += 1
        ENDW
        ENDM

        CALL    INIT

LOOP    MOVLB   1
        movpf   portc,portd     ;GET DATA
        DELAY   100             ;O/P TO PORTD
        GOTO    LOOP            ;

INIT    MOVLB   1       ;MOVE TO BANK 1
        CLRF    portc,1 ;INIT PORTC
        setf    ddrc,1  ;PORTC IS I/P

        clrF    portd,1 ;INIT PORTD
        clrf    ddrd,1  ;PORTD IS O/P
        MOVLB   0       ;MOVE TO BANK 0
        RETURN
        END

Warning[202] C:\MPLAB\TUTOR\DAC.ASM 37 : Argument out of range.  Least
 significant bits used.
Message[302] C:\MPLAB\TUTOR\DAC.ASM 37 : Register in operand not in bank 0.
 Ensure that bank bits are correct.
Message[302] C:\MPLAB\TUTOR\DAC.ASM 42 : Register in operand not in bank 0.
 Ensure that bank bits are correct.
Message[302] C:\MPLAB\TUTOR\DAC.ASM 43 : Register in operand not in bank 0.
 Ensure that bank bits are correct.
Message[302] C:\MPLAB\TUTOR\DAC.ASM 45 : Register in operand not in bank 0.
 Ensure that bank bits are correct.
Message[302] C:\MPLAB\TUTOR\DAC.ASM 46 : Register in operand not in bank 0.
 Ensure that bank bits are correct.