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Do the two I2C buses have on board pull-up resistors?
(07-26-2017, 02:33 PM)stephen fleming Wrote: [ -> ]Do the two I2C buses have on board pull-up resistors?

Yes, the pads have programmable pullups and pulldowns;  whether they are active for I2C is another question.  You will need to check. This depends on the driver and the software being used;
do a search on i2c because unless they have incorporated a setup file one of the devs created a good while back you will need to execute this script in order to get i2c to function. here ya go, but not sure if still relevant,
https://forum.pine64.org/showthread.php?...1#pid16661