Optiboot bootloader does not work on UART2 default pins

MCUdude / MegaCoreX

An Arduino hardware package for ATmega4809, ATmega4808, ATmega3209, ATmega3208, ATmega1609, ATmega1608, ATmega809 and ATmega808

GNU Lesser General Public License v2.1

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Optiboot bootloader does not work on UART2 default pins #186

Closed i-g-g-y closed 1 year ago

i-g-g-y commented 1 year ago

Config and programmed via UPDI and bootloader does not respond on pin 20, 21 for Atmega4808, TQFP32.

i-g-g-y commented 1 year ago

This should be moved to discussion, probably HW issue.

MCUdude commented 1 year ago

Well, you didn't provide any error messages, so I don't know what's going on.

I designed a board for 32-pin parts when I first developed this core, and the on-board USB connector is connected to UART2 default pins (PF0 and PF1) through a USB to serial adapter. And this board works perfectly fine with Optiboot. So check your hardware. I'm sure that's where the problem is.

i-g-g-y commented 1 year ago

I am also 99% sure it is HW related, namely I think the reset circuit does not work properly, thus the bootloader is not even entered.

Thanks for feedback!