Hi Arnd, thanks for looking into this, but I don't get your point yet. > The slave_cb callback function is supposed to set the 'value' > here, Only if a master wants to READ from us. > but it might return an error not assign the pointer, An error is only returned if a WRITE from a master was not accepted by the slave backend. > It might be best to change the callback to return 'void' and not > allow it to fail. We need that because in case of an errno, the slave should send NACK to the master instead of ACK. > At least the eeprom slave cannot fail anyway, and it is the only > implementation we have at the moment. True. But giving a slave the possibility to NACK a write should be present IMO. > Alternatively, the inline could return an error, and both bus > drivers check for the error before using 'value'. Hum, it does return an error? return client->slave_cb(client, event, val); You probably mean something else? Regards, Wolfram
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