About problem of Rrk3399's I2C being not able to driven up

penguin

@wizama

I2C4_SDA & I2C4_CLK are pulled up by the VCC_3V0 regulator.
Plz describe your problem more specifically.
It might be the same error message, but might not be the same reason.

penguin

You need to have the hardware guy check that.  SDA and SCL are pulled up to 3V. If no communication is in place, the voltage should be both 3V.
While communicating, there should be a square clock/signal.

penguin

Thanks ballsystemlord , for attaching a clear picture and tutorial link.