Code going into Illegal ISR

Hi Bhuvaneshwar,

I faced to this issue many times and, in my case, the ILLEGAL_ISR was caused by a bad organization in my Linker cmd file so, when the software was running, some part of the code was deleted by new data and then, causing the ISR... 

That wasn't even producing errors/warnings during compilation.

But obviously, this error can be caused by many things... I hope it helps

Regards,

Alex

Hi Alex,

 But how to find it out which portion of the code is giving problem and tackle it ?

Thank You

Hi Bhuvan,

Use breakpoints/ use the step into option while debugging and check closely where you are going wrong.

Regards,

Gautam

Hi Gautam,

                 Due to safety reasons i cant put break points in running code.

or cant do step into.

Thank You

Hello Bhuvaneshwar!

Do you use DSP/BIOS at your project?

Regards,

Igor

Hi Igor,

       No i dont use DSP/BIOS in my project.

Why is it realted to it or something ?

because i don't have  idea about it.

Thank You

Hi!

In general, the DSP/BIOS has no special relationship to this issue...But there are some features when debugger is used and there are some bugs that are not immediately obvious . I would recommend you these posts:

http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/256102.aspx

http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/143012.aspx

http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/104980.aspx

 http://e2e.ti.com/support/microcontrollers/c2000/f/171/p/270115/945759.aspx#945759. 

I'm not sure that it will be useful to you exactly. But maybe...

Regards,

Igor

Every time I can recall this happening to me, it was because I had a problem with a structure. I would add or delete a variable and not adjust the initializer that pointed to a function. So, when the processor needed to execute that function, it wouldn't go to it and instead go to the ILLEGAL_ISR.