SAMD21G15 Bootloader

[rdevries]

Hello,
Is there a bootloader which can be used on the SAMD21G15 microcontroller?
I have tried the Feather M0 bootloader but it doesn't seem to work for me.
Understanding that the flash and ram are smaller.

Thanks,

[84ace]

I am in the same position. Did you figure anything out?

[Franklin97355]

Are you using Adafruit boards?

[westfw]

Is there a bootloader which can be used on the SAMD21G15 microcontroller?
I have tried the Feather M0 bootloader but it doesn't seem to work for me.

1. The G15 variant only has 4k of RAM, while the existing bootloader binaries assume a chip with 32k of RAM. At a minimum, you'd need to recompile the bootloader from source with options set to match the G15.
2. The current bootloader makefiles do not support the G15.
3. The current bootloader makefiles seem to assume a very particular version of tools in a particular place. I don't know if that's out of caution, or because there are known problems with other versions.
4. (The Atmel spec for SAM-BA that I found seems to require the IAR compiler.)
5. Adafruit doesn't have any products based on the G15, so they certainly don't support a bootloader for it.
6. The existing bootloaders use 8k of flash. The G15 only has 32k; that means you'd be using a full 1/4 of your memory space for the bootloader.

All that seems a bit depressing.

You might want to take a look at Mattair Tech's software. They've implemented a couple of Arduino-compatible bootloaders for smaller SAMD chips (including SAMD11!), and seem to have at least substantially re-written the makefile to be less fussy.
https://github.com/mattairtech/ArduinoC ... aders/zero