Re: Errant readings on LM81 with T2080 SoC

On 9/03/21 9:27 am, Chris Packham wrote:

On 8/03/21 5:59 pm, Guenter Roeck wrote:

quoted

Other than that, the only other real idea I have would be to monitor
the i2c bus.

I am in the fortunate position of being able to go into the office and 
even happen to have the expensive scope at the moment. Now I just need 
to find a tame HW engineer so I don't burn myself trying to attach the 
probes.

One thing I see on the scope is that when there is a CPU load there 
appears to be some clock stretching going on (SCL is held low some 
times). I don't see it without the CPU load. It's hard to correlate a 
clock stretching event with a bad read or error but it is one area where 
the SMBUS spec has a maximum that might cause the device to give up waiting.