Illegal Instruction (TRAP)

samuele^_^

Hi!.....

Here is a problem that is boring me a lot...

I've done a simple V/Hz control for an induction machine, but when I launch the execution through debugger, the code stops immediately on the instruction "interrupt void ILLEGAL_ISR(void)"

this is the code of the main ADC interrupt.....if I try to remove some lines, for example if I comment "ADC_converter.read();" then the program flows normally!!.....

interrupt void ADCInterrupt(void)
{

   ADC_converter.read();
   ADC_converter.ImeasA -= (int16)offset1;
   ADC_converter.ImeasB -= (int16)offset2;

    clarke.As = _IQ15toIQ((int32)ADC_converter.ImeasA);
   clarke.Bs = _IQ15toIQ((int32)ADC_converter.ImeasB);
   clarke.calc(&clarke);

   VHz_profile.Freq = _IQ15toIQ((int32)ADC_converter.Ref_Pot);
   VHz_profile.calc();


   modulator_MF.Gain = VHz_profile.VoltOut;
   modulator_MF.Freq = VHz_profile.Freq;
   modulator_MF.Offset = 0;
   modulator_MF.calc();

    pwm1.MfuncC1 = (int16)_IQtoIQ15(modulatore_MF.Ta);
    pwm1.MfuncC2 = (int16)_IQtoIQ15(modulatore_MF.Tb);
    pwm1.MfuncC3 = (int16)_IQtoIQ15(modulatore_MF.Tc);
   pwm1.update(&pwm1);

    PwmDacCh1 = (int16)_IQtoIQ15(modulatore_MF.Alpha);
    PwmDacCh2 = (int16)_IQtoIQ15(modulatore_MF.Ta);
    PwmDacCh3 = (int16)_IQtoIQ15(modulatore_MF.Tb);
   pwmdac1.update(&pwmdac1);

   t_fir_filter = 1;
   flag_interrupt = 1;
   f_1msec = 1;

   // Enable more interrupts from this timer
   EPwm1Regs.ETCLR.bit.INT = 1;

   // Acknowledge interrupt to receive more interrupts from PIE group 3
   PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;

}

Does anybody have any clue on what is happening? Maybe some stack overflow? (Anyway stack size is 0x200 and I tried also 0x400 with no result...)

thank U.....!.......

samuele

over 12 years ago

0 Thirumoorthy R over 12 years ago

Expert 1460 points

Hi samuele,

Take a look into these post.

http://e2e.ti.com/support/microcontrollers/c2000/f/171/p/40471/144406.aspx#144406

http://e2e.ti.com/support/microcontrollers/c2000/f/171/p/139589/503092.aspx#503092

http://e2e.ti.com/support/microcontrollers/c2000/f/171/p/140669/510823.aspx#510823

Regard,s

Thirumoorthy.R

If my reply answers your question please click on the green button "Verify Answer"

0 samuele^_^ over 12 years ago in reply to Thirumoorthy R

Prodigy 170 points

Thank you Thirumoorthy

I tried some tricks that I found in the posts you suggested, anyway I cannot solve the issue...

case1) I put a breakpoint on the first instruction of the ADC interrupt (I have only 1 interrupt) and run: program stops with illegal trap (so, ADC interrupt is never serviced);

case2) I set the program counter to the last instruction of the main() before the idle loop: no problem, then I can go in single step forever. I can even put a breakpoint inside the ADC interrupt code and run: the program stops correctly on that instruction, and I can repeat this forever. But If I remove the breakpoint and run the program, it stops instantly on the illegal trap.

case3)I remove the breakpoint and reset CPU, than I set the PC on the first instruction of the ADC interrupt: program stops with illegal trap and this message is output: "Trouble removing breakpoint with the action "Terminate Gel_Go()" at 0x80CE".

To be honest, I cannot understand!!

ps, when the execution stops with illegal trap, stack pointer is 0x34, so I think I can exclude a problem concerning stack overflow (stack size is 0x200)

I'm a "little" confused :-)

any suggestion is welcome!

samuele

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Illegal Instruction (TRAP)