SV: [Icc-avr] Stack problems

[Bengt Ragnemalm]

Sorry, this was of course the same reason that before, the big local array.
After changing into one global this problem disappeared. But maybe someone
could describe this a little so I understand what happened? The stack
checking bytes was not overwritten.

/Bengt

> -----Ursprungligt meddelande-----
> Från: icc-avr-bounces at imagecraft.com [mailto:icc-avr-
> bounces at imagecraft.com] För Bengt Ragnemalm
> Skickat: den 15 augusti 2008 13:03
> Till: benra at imt.liu.se; 'Discussion list for ICCAVR and ICCtiny Users. You
> do NOT needtosubscribeto icc-announce if you are a member of this.'
> Ämne: [Icc-avr] Stack problems
> 
> I am beginning to get a hold on my problems now. Of course it was several
> problems as it usual are if you don't find the error quickly. First I have
> increased the hardware stack to 20 as it was overflowing. But know I have
> noticed that at entering a timer overflow interrupt, the interrupt routine
> is writing in my registers.
> 
> Here is the first line, copied from Studio so you can see C and assembler:
> @0000080E: SampleRateTimerOverflowInt
> 329:      void SampleRateTimerOverflowInt(void)
> +0000080E:   D48F        RCALL   PC+0x0490        Relative call subroutine
> 
> The RCALL goes here:
> +00000C9E:   920A        ST      -Y,R0            Store indirect and
> predecrement
> +00000C9F:   921A        ST      -Y,R1            Store indirect and
> predecrement
> +00000CA0:   922A        ST      -Y,R2            Store indirect and
> predecrement
> +00000CA1:   923A        ST      -Y,R3            Store indirect and
> predecrement
> +00000CA2:   924A        ST      -Y,R4            Store indirect and
> predecrement
> +00000CA3:   925A        ST      -Y,R5            Store indirect and
> predecrement
> +00000CA4:   926A        ST      -Y,R6            Store indirect and
> predecrement
> +00000CA5:   927A        ST      -Y,R7            Store indirect and
> predecrement
> +00000CA6:   928A        ST      -Y,R8            Store indirect and
> predecrement
> +00000CA7:   929A        ST      -Y,R9            Store indirect and
> predecrement
> +00000CA8:   930A        ST      -Y,R16           Store indirect and
> predecrement
> +00000CA9:   931A        ST      -Y,R17           Store indirect and
> predecrement
> +00000CAA:   932A        ST      -Y,R18           Store indirect and
> predecrement
> +00000CAB:   933A        ST      -Y,R19           Store indirect and
> predecrement
> +00000CAC:   938A        ST      -Y,R24           Store indirect and
> predecrement
> +00000CAD:   939A        ST      -Y,R25           Store indirect and
> predecrement
> +00000CAE:   93AA        ST      -Y,R26           Store indirect and
> predecrement
> +00000CAF:   93BA        ST      -Y,R27           Store indirect and
> predecrement
> +00000CB0:   93EA        ST      -Y,R30           Store indirect and
> predecrement
> +00000CB1:   93FA        ST      -Y,R31           Store indirect and
> predecrement
> +00000CB2:   B60F        IN      R0,0x3F          In from I/O location
> +00000CB3:   920A        ST      -Y,R0            Store indirect and
> predecrement
> +00000CB4:   9508        RET                      Subroutine return
> 
> The subroutine is obviously saving all registers. The question is there? Y
> is 0xBE, counting down for each save. And yes, 0xBE are right into my
> registers.
> 
> What should I look for to solve this?
> 
> /Bengt
> 
> 
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