[sdcc-devel] [ sdcc-Bugs-1690893 ] Unpredictable behavior when Power-on Reset

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Bugs item #1690893, was opened at 2007-03-29 20:49
Message generated for change (Comment added) made by tecodev
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Category: pic14 target
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: labolida (labolida)
Assigned to: Nobody/Anonymous (nobody)
Summary: Unpredictable behavior when Power-on Reset

Initial Comment:
The control flow assumes different behavior, at least two.
In the main function, the case instruction for time-slice (voic.c line 74) some times is reached, some times not.
I’ve looking for a program bug and have rewrited this logic many times in different ways, sorry but is possible there are a program bug that I can’t see. 
Compiler version is 
SDCC : mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08 2.6.3 #4543 (Dec 31 2006) (MINGW32)
With Bug #1683515 fixed by program code (FSR saving).


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>Comment By: Raphael Neider (tecodev)
Date: 2007-04-23 13:59

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I just fixed item #1704666 (Do "PAGESEL _main" prior to "GOTO _main") in
SDCC r4767, could you try whether this also fixes this problem? At least
the code should run again with the current svn revision, probably with the
same bug as before.


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Comment By: Nobody/Anonymous (nobody)
Date: 2007-03-30 21:00

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Compiled with the new version (20070330-4720) and the program don't run at
all.
Goback with 2.6.3 and everything run again, with the same bug of course.

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Comment By: labolida (labolida)
Date: 2007-03-30 17:39

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- How did ypu find out, that the case is reached sometimes? When not 
reached, the procedures portamento(), ringmodulator() and wave_sel() 
didn't respond to voltage control changes.

- What symptoms do you observe? Idem above.

- Does Timer0 cause unwanted interrupts? No, only via software.

- Is the watchdog disabled? Yes

config word (setting through IC-Prog)
__code unsigned __at(0x2007) foobar = _WDT_OFF & _BODEN_OFF & _PWRTE_OFF
&
_RC_OSC; 
Ok for the fuses, but oscillator is set to HS because the fosc is 20 Mhz.

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Comment By: Raphael Neider (tecodev)
Date: 2007-03-30 16:22

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The archive you submitted contains an old libsdcc.lib, which does neither
include the __sdcc_gsinit_startup routine nor __saved_fsr --> the code does
not compile with a current SDCC. OK, these are not required (introduced on
2007-01-22)...

Hmm, can you give more details?
- How did ypu find out, that the case is reached sometimes?
- What symptoms do you observe?
- Does Timer0 cause unwanted interrupts?
- Is the watchdog disabled?

You might need to define some config word a la
__code unsigned __at(0x2007) foobar = _WDT_OFF & _BODEN_OFF & _PWRTE_OFF &
_RC_OSC;

HTH,
Raphael


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