[sdiy] (OT) Help with uart

[Rainer Buchty]

> Does anyone have experience using a SCC2692 DUART??

No, but a 2681 which is quite similar, IIRC. Here's how it works for the
UART#1 of the 2681 DUART:

First, reset the thing: 0x40 to BASE+2 (reset error status), 0x50 to
BASE+2 (reset break change irq), 0x20 to BASE+2 (reset receiver), 0x02 to
BASE+2 (disable receiver), 0x30 to BASE+2 (reset transmitter), 0x08 to
BASE+2 (disable transmitter).

Then reset the MR pointer (0x10 to BASE+2), apply 8n1 by writing 0x13
to BASE+0 and 0x07 to BASE+0 and set the proper timing based on the used
inport line (port 4, 16x mode in my case -> 0xee) by writing the desired
value into BASE+2. Finally, enable rx by writing 0x01 to BASE+2.

Hope that helps,
	Rainer

-- 

Dr. Rainer Buchty, LRR, Technical University of Munich @ Garching
Phone: +49 (89) 289-18477, Fax +49 (89) 289-17662, Room 01.06.061