[GitHub] andrzej-kaczmarek opened a new pull request #1533: hw/mcu/nordic: Rework workaround for unresponsive TWI

[GitBox <gi...@apache.org>]

andrzej-kaczmarek opened a new pull request #1533: hw/mcu/nordic: Rework workaround for unresponsive TWI
URL: https://github.com/apache/mynewt-core/pull/1533
 
 
   Current workaround for unresponsive TWI will be triggered every time
   there is operation timeout which has some drawbacks: it will be
   applied to every operation that times out, it takes entire operation
   time to recover and it will make operation fail so caller needs to
   retry.
   
   It is possible to detect this condition and apply workaround quicker
   without making operation fail by using simple hack: after triggering
   START task SCL line should be pulled low to make START condition and
   also when address is written. We can just wait a moment to see if SCL
   is pulled low during this time - if not, restart controller and try
   again.
   
   This seems to work fine with LP5523 on the bus which can be used to
   easily trigger this condition by sending reset command.

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