TMS320F280037C: F280037C Watchdog Reset Behavior - main() Not Executing After Reset and GPIO4/75 Going High

Part Number: TMS320F280037C

Hi,

I have configured the watchdog timer on the C2000 F280037C with a timeout of approximately 1.6 seconds. While testing it by enabling the watchdog and intentionally not servicing it (using an infinite while loop), I am seeing two unexpected behaviors.

1. Watchdog timeout and reset behavior

   • The watchdog is timing out after approximately 1.67 seconds, which is close to the expected timeout.

   • However, after the watchdog reset occurs, I expect the device to restart and execute the main() function again. This is not happening in my application.

2. GPIO behavior after watchdog reset

   • After the watchdog reset, GPIO4/75 is going HIGH unexpectedly.

I have another standalone project with the same watchdog configuration, and in that project:

• The watchdog timeout occurs as expected.

• The device resets correctly.

• The main() function executes after every hardware watchdog reset.

Because the same watchdog configuration works correctly in the standalone project, I suspect there may be some application-specific configuration or initialization causing this issue.

Has anyone encountered similar behavior? What could cause:

• main() not to execute after a watchdog reset?

• GPIO4/75 to go HIGH immediately after the watchdog reset?

Any suggestions on what to check would be greatly appreciated.

Thank you.