----- Original Message -----
From: "Scott Pierce" <piclist@CALCLINKS.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, August 25, 2002 7:54 PM
Subject: [PIC]:Newbie's first attempt


> Hi all,
>
> I finally got my PIC programmer (El Cheapo) working so I thought I would

Scott:

You may think your El Cheapo is working, maby it is, maby it's not!!!  I
built and re-built an
El Cheapo,  it passes "ALL" the specified tests in the build/test section,
programms and verifies
just like Myke says it should but the simple fact is "It just don't work".
You should verify it with
a working programmer to make sure.  This newbie has been through every thing
you describe,
so think about the El Cheapo!!!   I sent Myke eight (8) different e-mails
concerning the
El Cheapo and have yet to receive my first reply!  I built somebody's KIT81,
a P16Pro and
invested in a PS+ and all work very well, just like to tinker I guess.

Charlie R.



> try my hand at a simple program.  I wrote a program to count from 0 to 255
> and display the contents of the count register on portb.  I have a 10 LED
> dip package connected to portb, two of the LEDs are not connected.  The
> pause routine I put in is simply to allow me some time to view the
contents
> of portb.  I realize that the tris command is obsolete and not recommended
> but I'm learning from a couple different books (Myke Predko's, and Easy
> Pic'n) and using the tris command seemed to be the easiest solution for my
> first program.  In MPLAB I set up the PIC using XT for the resonator, 4Mhz
> for the speed, WDT disabled.  The program compiles and burn into memory
> just fine but when I plug the chip into the circuit, nothing seems to
> happen.  I am 99% sure I set up the circuit properly as I have checked and
> re-checked all the connections at least 10 times.  I also stepped through
> the program listed below in MPLAB and it seemed to execute properly.
Using
> watch windows in MPLAB everything checked out.  As for the circuit, I
> started out using a 330 Ohm dip package in series with the anode pins of
> the LED dip package.  Next I tried tying the cathode pins of the LED
> package to portb and the anode pins of the LEDs to 330 Ohm resistors.  No
> LEDs turned on in either configurations.  Any help is greatly appreciated.
>
> Sincerely,
> Scott Pierce
>
>
>
> ;== Scott Pierce ================================================
8/24/2002 ===
> ;
> ; Counts from 0 to 255 and displays contents on portb
> ;
> ;
>
;===========================================================================
===
> ;
>         list    p=16f84a
>         radix   hex
> ;
>
;===========================================================================
===
> ;
> portb   equ     0x06
> count   equ     0x0c
> counti  equ     0x0d
> countj  equ     0x0e
> ;
>
;===========================================================================
===
> ;
>         org     0x00
> ;
>
;===========================================================================
===
> ;
> start   movlw   0x00
>         tris    portb   ;set portb to all outputs
>         movlw   0xff    ;set portb high
>         movwf   portb   ;set portb to all 0's
>         clrf    counti  ;set counti to 0
>         clrf    countj  ;set countj to 0
>         clrf    count   ;set count  to 0
> ;
>
;===========================================================================
===
> ;
> dispcnt movf    count,w ;move contents of count into work register
>         movwf   portb   ;output contents of count to portb
>         call    pause
>         incf    count,f ;increment count by one, results stored in file
reg
>         goto    dispcnt ;start loop over again
> ;
>
;===========================================================================
===
> ;
> pause   movlw   0x0f    ;set counter to 254
>         movwf   counti  ;move work register to counti file register
> loadj   movlw   0x0f    ;set countj to 255
>         movwf   countj  ;move work register to countj file register
> decj    decfsz  countj,f;decrement countj, if zero skip next instruction
>         goto    decj    ;loop decj again until countj = 0
>         decfsz  counti,f;decrement counti, if zero skip next instruction
>         goto    loadj   ;loop loadj again until counti = 0
>         return          ;when nested loops are done, return to dispcnt
loop
> ;
>
;===========================================================================
===
> ;
>         end
> ;
>
;===========================================================================
===
>
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>
>

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