Add bossa firmware update

[mattvenn]

Dygma Raise uses the SAMD21 chip from Atmel. The bootloader is based on the Arduino Zero, which uses bossa to upload new hex files.

Currently this is the line in the makefile that updates the firmware:

bossac -i -d --port=${DEVICE_PORT} -e -w ${BUILD_PATH}/${FIRMWARE}.bin -R

bossac will need to be packaged for windows, linux and mac.

Added complication: The SAMD21 doesn't have EEPROM, it does "emulated EEPROM". Which means that before flashing new firmware, the settings need to be read out of EEPROM and stored. Then after flashing the new firmware, restoring the settings.

[mattvenn]

found a pure javascript implementation of sam-ba here: https://github.com/synthetos/node-sam-ba/blob/master/sam_ba.js will test on the Raise

[obra]

(license for this is GPL3. @algernon - how does that play with the license regime for chrysalis?) ᐧ

On Tue, Jun 4, 2019 at 7:16 PM matt venn notifications@github.com wrote:

found a pure javascript implementation of sam-ba here: https://github.com/synthetos/node-sam-ba/blob/master/sam_ba.js will test on the Raise

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[algernon]

chrysalis-api (and Chrysalis itself) is GPL-3-only, that plays nice with GPL3+, so as far as licensing is concerned, node-sam-ba is fine.

[mattvenn]

we are now testing a fix for this - will submit a PR once we're happy

[algernon]

We have recently removed Raise support from Chrysalis, so this issue is moot now. If/when we re-introduce support for the Raise (or any other keyboard that uses Bossa), we'll add the appropriate flasher too.