do_1753.c

安装comedi板卡驱动之后的测试程序

//*************************************************************************
//				
//	         Copyright (c) 2001 IAG Software Team, 
//
//		           Beijing R&D Center 
//	
//		           Advantech Co., Ltd.
//
//	      User program for Linux comedi device driver
//
// This is An Unpublished Work Containing Confidential  And Proprietary
//    Information Which Is The Property Of Advantech  Automation Corp.
//
// Any Disclosure, Use, Or Reproduction, Without Written Authorization From
//           Advantech Automation Corp., Is Strictly Prohibit.
//
//
//*************************************************************************
// Program :    do_1753.c
// Revision:    1.0                                        
// Author  :    Luosheng Li                                             
// Date    :    10/20/01                                              
//
// Description:  Perform digital output testing of 1753
//-------------------------------------------------------------------------

#include <stdio.h>      //standard input output library
#include <stdlib.h>
#include <comedilib.h>  //comedilib library
#include <fcntl.h>      //file control library
#include <unistd.h>     //standard symbolic constants and types library
#include <errno.h>      //error codes report library 
#include <getopt.h>     //argument analyse function library
#include <ctype.h>      //c languge type library

char *filename="/dev/comedi0";  //comedi device file name
comedi_t *device;               //comedi device

int subdevice = 3;             //subdevice number,3 = digital output subdevice

int main(int argc, char *argv[])
{
        int stype;   //subdevice type number
        lsampl_t data ;
	   
        device=comedi_open(filename);  //open comedi device
        if(!device){
                comedi_perror(filename);
                exit(0);
        }
	    data = 0;
        stype = comedi_get_subdevice_type(device,subdevice); //get subdevice number
        if(stype!=COMEDI_SUBD_DO){
                printf("%d is not a digital I/O subdevice\n",subdevice);
                exit(0);
        }


	   printf("\nSubdevice  %d  channels  %d\n",subdevice, comedi_get_n_channels(device,subdevice));

	comedi_data_write(device,3,0,0,0,0);//
	comedi_data_write(device,3,16,0,0,0x8b);//write the pattern match value

	comedi_data_write(device,3,20,0,0,1);//write the pattern match value
	usleep(10000);
	comedi_data_write(device,3,24,0,0,1);//write the pattern match enable value
	usleep(10000);

	usleep(1000000);

    return 0;
}