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mmoskal / uf2-stm32f

UF2 bootloader for STM32F4
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How small could this firmware go? #1

Closed mithro closed 5 years ago

mithro commented 5 years ago

I was wondering how small you could make a UF2 compatible firmware? Could you fit it into a M0+ class device? Could you combined it with something like @xobs' https://github.com/xobs/grainuum stack?

xobs commented 5 years ago

I have an example of Grainuum running on an M0+ bootloader at https://github.com/xobs/joyboot however it's using HID and not U2F. If I were to redo joyboot (to actually produce the boards) I would use U2F now.

mithro commented 5 years ago

By that I assume you mean DFU rather than U2F?

mithro commented 5 years ago

Or UF2?

xobs commented 5 years ago

...yes, sorry. I hadn't heard of UF2 before, but I suppose the joyboot firmware could be easily adapted to UF2.

mmoskal commented 5 years ago

sorry for late reply, here's one for STM32F1 (which is M3, but small) https://github.com/mmoskal/uf2-stm32f103; here's one for SAMD21 (which is M0+) https://github.com/Microsoft/uf2-samdx1

I even had it running on the atmega usb interface chip of uno.

For full list see here https://github.com/Microsoft/uf2#bootloaders