Test code for the PCI DAS08 counter

Hi All!

I attached a test program that I used to test my patch that adds support 
for the 8254 found in PCI DAS08 boards.
I´m sending it so the mailing list archive gets a copy and people 
looking for an example can try it.
I added some comments explaining the external connections needed to run 
the test and what should you get.

Regards, SET

-- 
Salvador Eduardo Tropea (SET). (Electronics Engineer)
Visit my home page: http://welcome.to/SetSoft or
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Address: Curapaligue 2124, Caseros, 3 de Febrero
Buenos Aires, (1678), ARGENTINA Phone: +(5411) 4759 0013

/*
 * Test example to test the 8254 support for the PCI DAS08 board.
 * Coded by Salvador Eduardo Tropea.
 * Based on "Tutorial example #1" that's part of Comedilib:
 *
 * Copyright (c) 1999,2000 David A. Schleef <ds_at_schleef.org>
 *
 * This file may be freely modified, distributed, and combined with
 * other software, as long as proper attribution is given in the
 * source code.
 *
 * Notes: You have to connect any of the digital outputs (the program
 * drives all at the same time ;-) to the channel 0 clock. That's pin
 * 2 (CTR1 CLK) for my board.
 * You also have to provide a logic level 1 in the gate of this
 * channel (pin 21 CTR1 GATE) in order to enable the channel.
 *
 * Compile with: gcc -o 8254test 8254test.c -lcomedi
 *
 * How to use:
 * After doing the above mentioned connection run this program passing
 * one argument in the command line. It will program channel 0 in Mode
 * 0 and set the initial count to 6.
 * Then run the program again without an argument. It will decrement
 * the counter and show 0x30 as status.
 * Run it again and again until you reach 0, in this run the status
 * will become 0xB0. It indicates the output for this channel is 1 and
 * that's what should happend in mode 0.
 *
 */

#include <stdio.h>	/* for printf() */
#include <comedilib.h>

int subdev = 5;		/* change this to your input subdevice */
int chan = 0;		/* change this to your channel */
int range = 0;		/* more on this later */
int aref = AREF_GROUND;	/* more on this later */

int main(int argc,char *argv[])
{
	comedi_t *it;
	int chan=0;
	lsampl_t data[5];
        comedi_insn insn;
	
	it=comedi_open("/dev/comedi0");
        
	comedi_data_read(it,subdev,chan,range,aref,data);
        /* If the counter is 0 or we want to force it: */
        if (!data[0] || argc>1)
          {/* Set channel 0 as mode 0 and binary counter */
           memset(&insn,0,sizeof(insn));
           insn.insn = INSN_CONFIG;
           insn.n = 2;
           insn.data = data;
           insn.subdev = subdev;
           insn.chanspec = CR_PACK(chan,0,0);
           data[0]=INSN_CONFIG_8254_SET_MODE;
           data[1]=I8254_MODE0 | I8254_BINARY;
           comedi_do_insn(it,&insn);

           /* Set the channel 0 counter to 6 */
           comedi_data_write(it,subdev,chan,range,aref,0x6);
          }

        /* Generate a pulse in the digital outputs */
	comedi_data_write(it,3,0,range,aref,0);
	comedi_data_write(it,3,0,range,aref,0xFF);
	comedi_data_write(it,3,0,range,aref,0);

        /* Read the channel 0 of the counter */
        comedi_data_read(it,subdev,chan,range,aref,data);
	printf("Counter %X\n",data[0]);

        /* Read the status for channel 0 counter */
        memset(&insn,0,sizeof(insn));
        insn.insn = INSN_CONFIG;
        insn.n = 2;
        insn.data = data;
        insn.subdev = subdev;
        insn.chanspec = CR_PACK(chan,0,0);
        data[0]=INSN_CONFIG_8254_READ_STATUS;
        comedi_do_insn(it,&insn);

        printf("Status %X\n",data[1]);
	return 0;
}