Hi Paul,
Its hard to say what is going on without seeing some code. However, if
your 148 is pretty old it might be a hardware bug. There was a problem
with nested interrupts in old chips. Recent revisions should be OK. The
problem I had with these older chips is the ADC interrupts disappear.
You said you are actually using a timer A interrupt to read the ADC,
which should avoid that (it did for me - I have never lost ADC data
when reading it in a timer A or B interrupt). I think the same bug shows
up in other nested interrupt situations, though. Could this be your problem?
Regards,
Steve
Paul Burke wrote:
Friends, Russians and Countrymen!
I have a problem which is seriously weird. (no, not that one, I've seen
the doctor about that).
This doesn't seem to be a GCC bug, so relax..
I have an F148 program in which a fair amount is going on: interrupts
for Timer_A0 and Port 2 edge (for a TimerA uart), Timer_A1 CCR1 and
CCR2, and receive interrupts for both hardware uarts.
All interrupt routines are enablenested, and the right code seems to be
generated. So far so good.
Now the problem: I am using the ADC in sequence mode, for a sequence of
six channels. I've tested this in a standalone program, it's fine. The
problem is, when I integrate it with my real program, the TimerA uart
hangs.
The ADC conversion is called from the CCR1/2 interrupt. CCR2 is the 1ms
timebase.
The odd part is, that if I jimmy the check for ADC ready test to always
return 1, everything works OK (except of course for the ADC). With the
ADC test in place, the CCR2 interrupt completes (so the ADC isn't
hanging), but the uart runs (sometimes for one or two characters,
sometimes for a couple of dozen) then hangs.
The ADC ready test (ADC12CTL0 & ADC12SC) seems to produce the right
code, and there's nothing else in that routine apart from the pushes and
pops. There are no extra pushes compared to when I make the routine
return TRUE, so I'm not running out of stack.
I'm baffled. Can I put it to your combined almost infinite brain power
to come up with an explanation?
Regards
Paul Burke
