Steve Sutphen (steve@cs.ualberta.ca)
Mon, 6 Dec 1999 01:31:49 -0700
Hi,
I am trying to develop a custom hardware device and am interfacing
it to the parallel port. I am running RHL 6.1 on the machine that
I am using for development. It is running the 2.2.12-20 kernel.
I applied the patch-2.2.13-ppdev4 to it (with a little hand work),
and the new kernel compiles and runs just fine with the ppdev included
(as a static part of the kernel, I am not using modules). First I
tried to read using BYTE_MODE, and when that failed I switched to
EPP. It failed in that the data read was always the same - namely
what ever was last written to the device. With EPP (after changing
the hardware handshake) I got a similar result. The program that
I am using is:
----------------------read.c----------------
/*
* Simple parallel port input program for Linux. At this stage it is
* intended to test out basic functionality of read operations.
* Written Steve Sutphen, University of Alberta, 1999
* (e-mail: steve@cs.ualberta.ca)
*
* The program uses the user-space parallel port driver (ppdev) for Linux.
* Currently it is wired to read from the standard port /dev/parport0
*
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <linux/parport.h>
#include <linux/ppdev.h>
#define EPP
main(int argc, char **argv)
{
int fd, val;
unsigned char buf[8];
if ((fd = open ("/dev/parport0", O_RDONLY)) < 0){
fprintf(stderr, "cannot open /dev/parport0\n");
exit(1);
}
if (ioctl (fd, PPCLAIM) < 0) {
perror ("Cannot claim");
exit(1);
}
#ifdef EPP
val = IEEE1284_MODE_EPP;
#else
val = IEEE1284_MODE_BYTE;
#endif
if (ioctl (fd, PPSETMODE, &val) < 0) {
perror ("Cannot setmode");
exit(1);
}
if (ioctl (fd, PPRCONTROL, &val) < 0) {
perror ("Cannot read Control");
exit(1);
}
printf ("Control: 0x%x\n", val);
/* reset the counter */
val &= ~PARPORT_CONTROL_INIT;
if (ioctl (fd, PPWCONTROL, &val) < 0) {
perror ("Cannot write Control");
exit(1);
}
(void) sleep (1);
val |= PARPORT_CONTROL_INIT;
if (ioctl (fd, PPWCONTROL, &val) < 0) {
perror ("Cannot write Control");
exit(1);
}
if (ioctl (fd, PPRCONTROL, &val) < 0) {
perror ("Cannot read Control");
exit(1);
}
printf ("Control: 0x%x\n", val);
/*while (1) /*uncomment to scope interface signals*/
if ((val = read (fd, buf, 8)) < 0) {
perror ("read failed");
exit(1);
}
printf ("read %d bytes: %x, %x, %x, %x, %x, %x, %x, %x\n", val,
buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
buf[6], buf[7]);
if (ioctl (fd, PPRELEASE) < 0) {
perror ("Cannot release");
exit(1);
}
}
-----------------end read.c-----------------
I looked at the hardware with a scope, and it seems to be doing the
right thing (putting data on the data lines when pin 14 is low and pin 1
is high), but all I get is the last thing written.
I am including a PostScript file with the schematic (I hope that the 22K
is not too big for this mailing list). It is quite simple.
Any ideas where I have gone wrong? Was it in trying to wedge the
2.2.13 patch into a 2.2.12 kernel?
Thank you,
steve@cs.ualberta.ca
--------------test_epp.ps------------------------
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-------------end test_epp.ps--------------------
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This archive was generated by hypermail 2.0b3 on Mon 06 Dec 1999 - 06:36:00 EST