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RTOS/CC2640R2F: Question about the watchdog example on CC2640R2F_SDK

Part Number: CC2640R2F
Other Parts Discussed in Thread: CC2640

Tool/software: TI-RTOS

Hello, every one.  I test the watchdog example, I make sure it's just like what the example descripted: after I pressed button1, the button1 isr triggerd and turned off the function of clear wdt, and the wdt expires and the LED_read turn on 5S and offf.

My question is that the program don't restart from the main function after wdt expired. Can you tell me why?

According to my test result, I think the WDT don't make use in case program fall in infinite loop, and can't reset the device cc2640

BTW, my hardware is CC2640_launchpad,  my software is CCS8.2.0, my sdk is CC2640_SDK_1_40_00_45