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Date:      Sun, 27 Oct 2002 16:31:46 -0800 (PST)
From:      David Nicholas Kayal <davek@saturn5.com>
To:        freebsd-hackers@freebsd.org
Subject:   Programming the Parallel Port using ppi.
Message-ID:  <Pine.BSF.4.44.0210271631090.1093-100000@blackbox.yayproductions.com>
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I've updated the program to read as thus:

#include <stdio.h>
#include <dev/ppbus/ppi.h>
#include <dev/ppbus/ppbconf.h>
#include <fcntl.h>

int main()
{
  int             fd;
  u_int8_t        val;

  fd = open("/dev/ppi0", O_RDWR);
  val = 0xff;
  while(1)
    {
      ioctl(fd, PPISDATA, &val);
      ioctl(fd, PPIGCTRL, &val);
      val |= STROBE;
      ioctl(fd, PPISCTRL, &val);
      val &= ~STROBE;
      ioctl(fd, PPISCTRL, &val);
    }
}

I have tried to test the output of pins 2 through 9, with a voltmeter, using pin 25 as the ground pin.

Nothing registered.

I tried again to use the LED, but that did not register anything as well.

I am thinking of putting a 1k ohm resister on the positive side of the LED.



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