MCU going into FaultISR when initializin the buffer with zero.

Sanchit Mehra

Expert 1360 points

Hello,

when I write the code as :

unsigned int verify_buff[115] = {0,}; => it goes into FaultISR routine.

but when I initialize the code as

unsigned int verify_buff[115] ; => it works fine.

I am using TIVA C Series 129 model,

Please suggest about this behaviour .

Thanks,

Sanchit Mehra

over 11 years ago

0 Leo Hendrawan over 11 years ago

TI__Guru 56650 points

Hi,

you can refer to the following document: http://www.ti.com/lit/an/spma043/spma043.pdf for diagnosing the fault cause.

0 Randy Ott over 11 years ago

Intellectual 750 points

Sanchit,

Where is verify_buff being declared? Is it a local automatic variable? If so, you might not have enough stack space for it. You are using 460 bytes of ram for this one array writing to it might cause stack crash.

Randy Ott

0 Sanchit Mehra over 11 years ago in reply to Randy Ott

Expert 1360 points

Hi Randy,

Yes, it is local automatic variable , decalred and defined in the function .

I will check it out this point.

Thanks.

Sanchit

0 Leo Hendrawan over 11 years ago in reply to Randy Ott

TI__Guru 56650 points

Hi,

Randy is right. Forgot to mention that most of the times, the cause of entering FaultISR unexpectedly is stack overflow. You can try to increase the stack as described here:

http://processors.wiki.ti.com/index.php/Stellaris_FAQ#How_to_increase_stack_size_for_Stellaris_projects.3F

It was written for Stellaris, but should be very similar for Tiva projects on CCS.

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MCU going into FaultISR when initializin the buffer with zero.