Closed heywalker closed 1 year ago
Marking as critical as boards are bricked by simple bootloading.
It is not unexpected that reset will not work without bootloading, see section 8.8.2.4 (numbering based on 64dd14/20 datasheet), default from factory is that reset is input, not reset.
However, when bootloading, instead of putting the UPDI and Reset pin config bits into bit 3 and 4, it's putting them into bits 2 and 3, so bootloading always disables UPDI. I will get a fix for this out ASAP. Bugs that ruin people's hardware (especially when the DD's can't use the same HV programmers that were designed for tinyAVR - tinyAVR gets the HV pulse on the UPDI/Reset pin, while the DD's need the HV pulse on the reset pin, while the UPDI pin isn't HV tolerant) definitely qualify as critical.
Ahh, that make sense. Do you have a datasheet for DD, where the maximum voltage of the Reset is correct shown? All ones I found shows: "-0.3 to + 9.0)", that would not be compatible, with the 12V pulse of the HV-programmers, too.
Happy Days! Reset now works, and no more bricked DD chips. Thanks!
Grounding the Reset Pin, PF6, fails to reset the device. Tested on 5 AVR32DD14 and 1 each AVR16DD20 and AVR32DD20. Attempt to burn bootloader in case of a fuse problem, but doing so bricked 2 boards. I don't see a way to configure at boot time. Am I missing something absurdly simple? Any suggestions? DxCore 1.5.2, Arduino 1.8.13, Linuxmint, CP2102.