Patrick,

It may be working, but your indicator may not show it. Replace the 470K
resistor with a 470 Ohm resistor. Then you may be able to see the LED
light.

Vern Jones, Sound Research

Patrick Plattes wrote:
>
> hello :-)
>
> the last days i have started to work with the pic microcontrolers. i'm
> using the epic programmer with a linux enviroment. but i have a
> difficult problem (for me).
>
> i have created a little demoboard:
>
>        -----------------------------|
>        |                            |
> + ------        |---|470K|---<LED---|
>        |  ------|
>      14|  |1    |->-|
>   -----------       |
>   |         |       |
>   |         |       |
>   -----------       |
>       5|            |
>        |            |
> - -------------------
>
> and i'm using this pogramm (or any other pogramm) it dosn't work:
>
> ;************************************************************
> ; Processor: PIC16F628 at 4 MHz using internal RC oscillator
> ; Function:  Flash a LED connected to RA2
> ; Hardware:  Testboard K4
> ; Filename:  628LED.asm
> ; Author:    Lars Petersen, oz1bxm@qsl.net
> ; Website:   www.qsl.net/oz1bxm/PIC/pic.htm
> ; Credit:    Tony Nixon's LED flasher
> ;************************************************************
>
>         LIST P=16F627, R=DEC    ; Use the PIC16F628 and decimal system
>
>         #include "p16f627.inc"  ; Include header file
>
>         __config  _INTRC_OSC_CLKOUT & _WDT_OFF & _PWRTE_ON
>
>         CBLOCK 0x20             ; Declare variable addresses starting at 0x20
>           Loop1,Loop2
>         ENDC
> ;
> ; -----------
> ; INITIALIZE
> ; -----------
> ;
>         ORG    0x000           ; Program starts at 0x000
>
>         CLRF   PORTA           ; Initialize port A
>         CLRF   PORTB           ; Initialize port B
>
>         BSF    STATUS,RP0      ; RAM bank 1
>
>         CLRF   TRISA           ; All pins port A output
>         CLRF   TRISB           ; All pins port B output
>
>         BCF    STATUS,RP0      ; RAM bank 0
> ;
> ; ------------------------
> ; FUNCTION OF PORT A PINS
> ; ------------------------
> ;
>         MOVLW    7
>         MOVWF    CMCON         ; Comparators off, all pins digital I/O
> ;
> ; ----------
> ; MAIN LOOP
> ; ----------
> ;
> Main    BSF     PORTA,2        ; Turn on LED connected to RA2
>         CALL    delay
>         BCF     PORTA,2        ; Turn off LED connected to RA2
>         CALL    delay
>         GOTO    Main
> ;
> ; ---------------
> ; DELAY 250 MSEC
> ; ---------------
> ;
> delay   MOVLW   250
>         MOVWF   Loop1
> Outer   MOVLW   200
>         MOVWF   Loop2
> Inner   NOP
>         NOP
>         DECFSZ  Loop2,F
>         GOTO    Inner          ; Inner loop = 5 usec.
>         DECFSZ  Loop1,F
>         GOTO    Outer
>         RETURN
>
>         END
>
> to compile the pogramm i do a:
> gpasm -a inhx16 file.asm
>
> than i write the pic:
> prog84 -T 16628 -y file.hex
>
> (the hex file with -x work with gpsim)
>
> then i verify the pic and it looks correct, but it dont work in the demo board.
>
> the file i get with "dump84 -x -a -T 16628 > dumpfile.hex" works also with the gpsim.
>
> and now: where is the problem, why does it not work with demo board??
>
> thanks
> patrick
>
> ps. i'm sorry about my terrible english, i'm from germany
>
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