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I2C communication

Question asked by McC.Joe on Dec 16, 2016
Latest reply on Mar 21, 2017 by Simoes.Andre

Hello, I am using an F0 nucleo board and i am trying to talk to a RTC on an expansion board. I can bit-bang the thing and communicate but would like to use the hardware.  I am not getting a TXIS flag or a TXE flag to go high after the first byte.

I am thinking I am not getting an ack back from the RTC.  How is the reading of the ack done by the master. Looking at

the manual and the block diagrams it seems like it is done behind the scenes because the flow chart doesnt show the

reading of the ack just the setting of the TXIS flag which prompts the next byte into the xmit reg.

Anybody have a clue. I don't.