[PARPORT] 5V TTL serial communication through parport/duart setup

Jon Burford (jburford@xsilogy.com)
Wed, 15 Sep 1999 20:14:13 -0700

I am using a board through which I would like to communicate with two 5V TTL serial devices concurrently, both at 9600bps. My initial plan is to use the following hardware setup:

PARPORT -> DUART => 2 serial devices

I was hoping to connect the parallel port control pins to the 3 address lines on the duart. Then use the 8 data pins with the 8 data pins of the duart. Since data must be bi-directional, the parallel port must be in ECP/EPP mode. The motivation behind this is to save the board's 2 serial ports for other peripherals which require serial as well. I would like some suggestions on the following:

1) Must my code live in kernel space in order to service the two devices running async at 9600bps each?
2) Can I use the control pins for the duart's address lines if the parport is in ECP/EPP mode?
3) Has anyone attempted this or seen code or other helpful resources out there?

Your comments and suggestions are much appreciated!

Jon Burford

This archive was generated by hypermail 2.0b3 on Wed 15 Sep 1999 - 23:19:11 EDT