Add ability to update firmware via I2C

riban-bw / I2C-Hardware-Controller

A hardware controller providing rotary encoders, switches and potentiometer values via I2C

GNU General Public License v3.0

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Add ability to update firmware via I2C #10

Open riban-bw opened 5 years ago

riban-bw commented 5 years ago

It may be advantageous for the host machine to be able to update the firmware of the I2C HWC. There is already an I2C connection and all other pins are currently utilised. Could we add the ability for firmware update via I2C?

riban-bw commented 5 years ago

This would require:

New messaging schema (already in progress)
Method of writing to flash program memory
Dual firmware locations within program memory to allow update and switch whilst running firmware
Bootloader capable of switching between firmware locations
Robust validation of firmware, ideally with rollback ability in case of bad update

Alternative may be to use existing firmware update methods and switch serial port via host driven signalling e.g. GPI to gate serial port connection.