First let me say XIAO is a nice product. However from within the Arduino IDE, I uploaded some code which directly modifies some TCC0 control registers and interrupt ISR (as defined within Microchip’s TCC0.h component header file, as also seemingly used by Seeed’s TimerTCC0 XIAO driver); I can no lo…

I’m stuck with this same problem; any more info on how to flash a new bootloader? I’m not quite understanding how to pull that off.

The J-Link EDU mini can be had for < $20 for non-commercial use, and can be used to re-flash the boot-loader if necessary; you’ll need to either solder wires to the SWD pads on back of the XAIO, or construct some sort of a jig; but I’d try rebooting your host computer first, as it appears sometimes …

I’ve seen a few places mention using a Raspberry Pi as a SWD programmer, might give that a shot. Once that’s setup how do you actually flash the firmware? I already tried multiple computers, pretty sure it’s the XIAO. The reset pins don’t do anything on either machine. I already managed to fry my …

Sorry I don’t know about use of the Raspberry Pi as an SWD programmer, but Segger offers free basic SW for use with their J-Link product, capable of re-flashing the XIAO boot-loader. Maybe some one else can answer your question.

Oh no that’s actually helpful thank you. I was thinking there was going to be some standard SWD commands or something I’d need to learn. Looks like this OpenOCD library for Raspberry Pi can do it. I’ll just need to learn how OpenOCD does the flashing process.

Hi, Is the bootloader code publicly available? Also, can i upload a different bootloader? like optiboot?

our bootloader is open source. Just checked out optiboot, and it seems only support AVR chips?

hey, thanks to you i came across openocd and was able to repair my xiao bootloader - here is how [image] How to unbrick a dead xiao using raspberry pi [ GUIDE ][openocd] XIAO So guys, finally, i was able to revive my dead XIAO after hours of research on google. It can be …

Hi, I was able to repair the bootloader using the cheap Chinese ST-LINK V2 and OpenOCD for Windows.

Possible Reset Boot Loader Problem?

Products & Technology XIAO

John_Doe September 2, 2020, 5:08pm 11

hey, thanks to you i came across openocd and was able to repair my xiao bootloader - here is how