I2C Slave with a PIC

[Darrel Taylor]

Thanks for the files tacbanon.

Well, this code for the slaves will allow it to read from both devices.

main:  
    IF SSPCON1.6 THEN SSPCON1.6 = 0
goto main 

i2c_int_handler:
    IF i2c_read then
        IF i2c_buffer_full=0 THEN
            SSPBUF=i2c_data[i2c_data_index]
            i2c_data_index=i2c_data_index+1
        ELSE
            dummy = SSPBUF
        ENDIF
    ELSE
        i2c_data_index=0
    ENDIF
    i2c_release_scl=1 
@ INT_RETURN

But it's still not right. And is not a complete slave.

According to AN734 there are 5 states to maintain. 6 including the ERROR state.
Your original code only handles 1 state, and this modification only does 2 states.

I think by adding the other 4 states, it will get rid of the buffer overflows, but I'm not absolutely sure.
I'm going to convert AN734 state machine to PBP and see what happens.
May take me awhile.