Commits on Jul 14, 2020

1. firmware/i2c: rewrite I2C implementation …

   * Never drive SDL or SDA high. They are specified to be open
     collector/drain and pulled up by resistive pullups. Driving
     high fails miserably in a multi-master topology (e.g. with
     a USB I2C interface). It would only ever be implemented to
     speed up the bus actively but that's tricky and completely
     unnecessary here.
   * Make the handover states between the I2C protocol phases (start, stop,
     restart, write, read) well defined. Add comments stressing those
     pre/postconditions.
   * Add checks for SDA arbitration failures and stuck SCL.
   * Remove wrong, misleading or redundant comments.

   

   jordens committed Jul 14, 2020
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