do_loop.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// This is An Unpublished Work Containing Confidential  And Proprietary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_loop.c
// Revision:    1.0                                        
// Author  :    Edwin                                             
// Date    :    10/17/02                                              
//
// Description:  Perform analog input of comedi driver with insn mode.                             
// 		 This program reads N_SAMPLES samples from an analog
//		 input each time and return the time it's used.
//                                                  
//-------------------------------------------------------------------------

#include <stdio.h>
#include <stdlib.h>
#include <comedilib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <getopt.h>
#include <ctype.h>
#include <math.h>
#include <sys/time.h>
#include <string.h>

#define N_SAMPLE 2

char *filename="/dev/comedi0";
int verbose_flag;
comedi_t *device;

int channel =1;
int range = 0;
int subdev = 3;

int main(void)
{
        lsampl_t data[N_SAMPLE];
        int save_errno;
        int ret,n_channels;
	comedi_insn insn;
	long count=1;
	
	printf("************** do_insn.c****************\n");
        printf("\n     Comedi driver test program\n\n");
        printf("****************************************\n");
        device = comedi_open(filename);
        if(!device){
                printf("E: comedi_open(\"%s\"): %s\n",filename,strerror(errno));
		return 1;
        }
        memset(&insn,0,sizeof(insn));

        n_channels = comedi_get_n_channels(device, subdev);

	insn.subdev = subdev;
        insn.insn = INSN_BITS;
        insn.n = N_SAMPLE;
        insn.data = data;
        while(1) {
	  count *= 2;
	  if (count >= 0xff) count = 1;
	  //mask:
	  data[0] = count;
	  //value:
	  data[1] = 0xff;	  
	  ret = comedi_do_insn(device,&insn);     //sample data
	  usleep(300000);
	  save_errno = errno;
	  if(ret<0){
	    comedi_perror(filename);
	    exit(0);
	  }

	  data[1] = 0;	//clear up
	  ret = comedi_do_insn(device,&insn);
	  save_errno = errno;
          if(ret<0){
            comedi_perror(filename);
            exit(0);
          }
	  usleep(300000);
        }
	comedi_close(device);	


	return 1;
}