CCS/C2000WARE: interrupts

Hi,

1. How is NMI handler works, do we need to write code for NMI handler or it will be taken care by the controller itself.

Yes, you need to write NMI handler just like any other interrupt handler.

2. Is NMI watchdog period used for the NMI recovery ?

Yes but that recovery is done by user NMI handler not in hardware. Inside handler user need to check the error condition and take appropriate action based on their usecase. If appropriate action is not taken and NMI flag is not cleared by SW within NMI watchdog period then a reset will be issued by hardware.

Regards,

Vivek Singh

Hello Vivek,

Thanks for the reply.

1. In my source code i set watch dog period and I made clockfail signal high, then watch dog counter started incremented but the NMI Interrupt is not triggered. as per my understanding when clockfail occurs control should jump to NMI interrupt routine and when watch dog counter overflows watch dog period reset should be triggered (XRSn pin should go high).

if my understanding is correct, let me know the procedure to execute NMI interrupt routine.

PS : NMI interrupt routine is configured in pievector table.

2. By default watchdog period is set to max value, can i configure to different time periods based on the type of NMI sources.
Is it valid to do so?

Regards,
Sharath Choudary.