I2C Slave with a PIC

[mister_e]

by e-mail
http://melabs.com/contact.htm?source=sidebar

[tacbanon]

Thanks mister_e

[Demon]

Or you can stuff it in a ZIP file and post it here. The forum accepts ZIPs as attachments.

Some RAR programs can also save as ZIP format.

Robert

[tacbanon]

Thanks for the info Robert...
and here is the zip file.

Regards,
tacbanon

[tacbanon]

Oops here are the codes I'm using for the master, Slave1 and Slave 2.

[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.

[tacbanon]

Thank you for the code, and thanks in advance DT for your valuable time...looking forward for the end result(I wish and pray that things goes well). I've been reading about I2C on net, trying to understand and the applications that might be done(particularly on Master-(multi-Slave/Multi-master)) are very interesting...

Regards,
tacbanon