Hello,


> What is the date code on the SX52? Some older versions are not
> supported with the SX-Key Rev E.
> http://www.sxlist.com/techref/ubicom/sx48-52.htm

The datecode is AB0022AT so it should be ok, i guess.

> Is the failure reliable? If not, it may be a communications
> failure between the SX-Key and the PC or excessive noise or bad
> connection between the key and 52. I've seen a lot of "strange"
> things with SX-Keys.

The failure is reliable but it doesn't seem to give exactly the same
results when single stepping, running with the debugger or running without
the debugger.

Here is a program that does fail, both single stepped with the debugger and
run without the debugger. When run with the debugger it reports 'Sleeping'
and doesn't lit either the red or green led, though:

        DEVICE  OSCXT2,BOR42,DRT18MS

        FREQ    10_000_000
        RESET   Startup

        r_LED_GREEN     equ     re
        b_LED_GREEN     equ     0
        f_LED_GREEN     equ     r_LED_GREEN.b_LED_GREEN
        m_LED_GREEN     equ     1<<b_LED_GREEN

        r_LED_RED       equ     re
        b_LED_RED       equ     1
        f_LED_RED       equ     r_LED_RED.b_LED_RED
        m_LED_RED       equ     1<<b_LED_RED

        E_INPUTS        equ     ~(m_LED_RED | m_LED_GREEN)
        E_DEFAULT       equ     m_LED_RED | m_LED_GREEN

        org     $0a

        ROM_L           DS      1
        ROM_H           DS      1
        REF             DS      1

        org     0
_iread_
        jmp             @_iread_doit

Startup
string_test
        mov             w,#$1f
        mov             m,w
        mov             !re,#E_INPUTS
        mov             re,#E_DEFAULT

        mov             ROM_L,#(string & $ff)
        mov             ROM_H,#(string >> 8)
        mov             REF,#'A'
loop
        mov             w,ROM_H
        mov             m,w
        mov             w,ROM_L
        call            _iread_
        test            w
        snz
        jmp             success
        xor             w,REF
        sz
        jmp             fail
        inc             REF
        inc             ROM_L
        snz
        inc             ROM_H
        jmp             loop
fail
        clrb            f_LED_RED
        skip
success
        clrb            f_LED_GREEN
        jmp             $

        org     $300
_iread_doit
        iread
        retp

        org     $b00
string
        dw              'ABCDEFGHIJKLMNOPQRSTUVWXYZ',0

I have had a lot of other problems when doing the software for my current
project; Doing a retp without setting the page bits, reading from a
register to w but w isn't correct after the read, rtcc rollover interrupt
not triggered and now this. Some of these errors I have discovered without
the debugger and could verify with the debugger, some only seems to exist
with the debugger or act differently with the debugger. Most of the errors
have disappeared when moving the code around to other banks or just within
the same bank.

Is there something I can do to reduce the amount of 'strange' things with
the SX-Key, except replacing it?

The original program I posted did succeed without the debugger but the
program I have here more resembles my real program that does fail without
(and with) the debugger.

These 'strange' things are beginning to take up too much time from real
programming work and changing IDE might work to some extent but not
entirely since some errors still appear without the IDE.

>
> Try a test program that counts up a register from "A" and
> compairs it with the data from the IREAD and turns on an LED if
> they don't match, then run it off the SX-Key. If it works,
> consider replaceing the SX-Key with rev F (latest) from Parallax
> Inc or switch to the SX-DEV.
> http://www.sxlist.com/techref/ubicom/debuggers.htm
>
> ---
> James Newton: PICList.com webmaster, former Admin #3
> mailto:jamesnewton@piclist.com  1-619-652-0593 phone
> http://www.piclist.com/member/JMN-EFP-786
> PIC/PICList FAQ: http://www.piclist.com

==============================
Ruben Jvnsson
AB Liros Electronic
Box 9124, 200 39 Malmv, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
==============================

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