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From: cheong@uiucdcs.UUCP
Newsgroups: net.unix-wizards
Subject: A/D Driver on 4.2bsd
Message-ID: <13700097@uiucdcs.UUCP>
Date: Wed, 30-Jan-85 17:42:00 EST
Article-I.D.: uiucdcs.13700097
Posted: Wed Jan 30 17:42:00 1985
Date-Received: Sat, 2-Feb-85 00:16:16 EST
Lines: 30
Nf-ID: #N:uiucdcs:13700097:000:1025
Nf-From: uiucdcs!cheong    Jan 30 16:42:00 1985


I am writing a driver for an Analog to Digital converter, DT1711
series from Data Translation, Inc. The driver is written on Unix 4.2bsd
on a VAX 11/750. I am having a TIME OUT problem when I start the convertion
process. According to the manual for the series, the TIME OUT bit in the
control status register is set because non-existant memory was addressed.
I get the buffer address by doing the following:

/********* /sys/vaxuba/ad.c ******/
struct buf *bp;
int sc_ubinfo[2];
short dmacar; /* dma current address register, it needs a memory 
                 location to put the data in*/
*************/

         bp = geteblk(512);
         sc_ubinfo[0] = ubasetup(ubanum,bp,UBA_NEEDBDP);
    ==>  dmacar = sc_ubinfo[0]; 

Am I doing this right? Or what address should I give to dmacar? I would
appreciate very much if someone could give me some help. Thanks in advance.


-----------------

			Infan Cheong
                        University of Illinois at Urbana-Champaign
                        cheong@uiuc.ARPA