btashton commented on pull request #3646:
URL: https://github.com/apache/incubator-nuttx/pull/3646#issuecomment-831180931
> This is the result.
> ```
> nsh> i2c dev -b 1 0x00 0x7f
> 0 1 2 3 4 5 6 7 8 9 a b c d e f
> 00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> ```
This would indicate no I2C device at all was found on the bus (It tried
addresses 0x00-0x7f).
I would double check that everything is wired correctly and has power /
enabled. Until the device shows up as it did in my example, the driver will not
be able to register it.
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