You might want to try delaying a bit before sending the signal in setup. If you are powering on the master and slave at the same time, the slave may need a bit more time to get through its own setup before being ready to receive I2C signals.
You might want to try delaying a bit before sending the signal in setup. If you are powering on the master and slave at the same time, the slave may need a bit more time to get through its own setup before being ready to receive I2C signals.