On Sun, 24 Nov 2019 18:00:25 +0100, "R.Wieser" 
wrote:

>> On test, it failed (but recovered) more than once per hour. On
>> reverting to the bit-banged driver we had already supplied, they
>> saw no failures in more than two weeks.
>
>Ever found out what the problem was ?  A too-high transmission speed ?

I2C is an edge-triggered protocol by design. Very small but fast
glitches can upset the hardware peripherals. Designing I2C interfaces
with good noise immunity is well beyond the scope of very
cost-sensitive devices including the Raspberry Pi.

Stephen


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