OK Morgan,
Here is a working parser.  it assumes WDT is on, but dont do
anything to clear it till after the parser is finished.  i
get a lot of race loops if i forget.  dont initialize
anything either. just parse out the various flags and figure
out why the reset occurred.  This one traps WDT, MCLR, Cold
boot, warm boot, deliberate timeouts, sleep, and other things.

Reqires a flag register called mflag here.
This router dumps all mystery states to the wmbt routine
which initializes everything and puts selected registers on
the rs232 output line for analysis.

alice


> Somebody have probably already written a routine to run after reset to d=
ecode what coused th routine, like:
>
> If it was Watchdog reset goto WatchdogRecoveryHandler
> If it was power on...
> If it was brown out reset...
> If it was....
>
> Such routine might be time consuming to validate, so if somebody have te=
sted working code i would appreciate that.
>
> It might be in an archive somewhere i have not found?
>
> And then there are those things to think about, i beliave, like not go a=
head to load setup from EEPROM if it was a reset during EEPROM write and i=
s still writing...
>
> Hmm... i should have checksum handling for EEPROM...
>
> /Morgan
> Morgan Olsson                   morgans.rt@telia.com
> Morgans Reglerteknik, H=E4llek=E5s, 277 35 KIVIK, SWEDEN
>     tel +46(0)414-446620, fax +46(0)414-672324
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.



;;
 org     0
 nop
;       goto    top
;       org     0x004
top
 call   init
 CLRF   PORTA
 CLRF   PORTC
 clrf   PORTB
;       clrf    mflag   ;for debugging purposes especially simulator
;parse the big guys
 btfsc   status,TO      ;status,4
 GOTO    TO1            ;to=3D1 wmbt or startup
 GOTO    TO0            ;to=3D0 wdt in sleep or wdt

TO0    btfss   status,PD      ;this actually is used
 goto    wmbt           ;to=3D0 pd=3D0 reset+clrwdt
 goto    wozat            ;to=3D0 pd=3D1 wdt

TO1    btfss   status,PD      ;hello? hello?
 goto    main            ;to=3D1 pd=3D1 powerup
 goto    wmbt            ;to=3D1 pd=3D0 sleeeeeeeep

;parse out the flags next
;sort of a state machine i guess
wotrst  btfsc   mflag,0         ;mclr+sleeping? not done, dump
        goto    wmbt;zzz           ;decrement lsb of sleep or
continue

t_6      btfsc   mflag,6         ;err goes to dump
        goto    wmbt            ;dont clear this in wmbt
t_7      btfsc   mflag,7         ;decrement sleep loop
        goto    woof
t_0      btfsc   mflag,0         ;main sleep
        goto    zzzz
t_2      btfsc   mflag,2          ; during readout
        goto    mopup            ;restore old address and goto
readlp
t_1      btfsc    mflag,1         ;flag for end of write loop
        goto    disp
t_4      btfsc   mflag,4                ;setup area
        goto    loopw
t_5     btfsc   mflag,5
        goto    loopw
dunno   goto    wmbt    ;dont know why were here

;))))))))main starts((((((((

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