Prevent hang on watchdog reset with DUE Platform #27803
Merged
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An unusual condition was observed with Archim2 boards where the watchdog would trigger during long operations, such as USB reads, and the board would freeze and not reset. The issue was partially mitigated by moving off the UHS2 USB library back to SD, however the issue still occasionally poked out.
CDSmith at Lulzbot began digging into D100 and observed it would hang and stop execution but the board did not reset, so we looked into the watchdog flags. We added code to report the watchdog state and monitored the output inside D100
We found the MCU did attempt a reset but did not fully load back to the user program. From there, we looked at the registers and saw we were performing a CPU only reset and not to PIO state, so we cleared this register and found we could consistently reboot following a watchdog trip.