ao_insn.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// This is An Unpublished Work Containing Confidential  And Proprietary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 :    ao_insn.c
// Revision:    1.0                                        
// Author  :    jingang                                             
// Date    :    09/20/01                                              
//
// Description:  Perform analog output 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 256 

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

int subdevice = 1;
int channel = 3;
int aref;
int range = 0;

int main(void)
{
        lsampl_t data[N_SAMPLE];
        int save_errno;
        int ret, i, n_channels;
	comedi_insn insn;
	comedi_range *srange;
	float v;
	char inputchar[10], argument;
	
	printf("************** ao_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, subdevice);
        
	insn.subdev = 1;
        insn.insn = INSN_WRITE;
        insn.n = N_SAMPLE;
//        insn.chanspec = CR_PACK(channel, range, 0);
        insn.data = data;

	while(1) {
		printf("subdevice: %d\n", subdevice);
		
		while(1) {
			printf("Please key in the Channel number:");
			scanf("%s",inputchar);
			channel = atoi(inputchar);
			if(channel >= 0 && channel <= n_channels)
				break;
			printf("Bad channel number!\n");
		}
		
		while(1) {
			srange = comedi_get_range(device, subdevice, channel, 0);
			printf("Please key in the Voltage [%f, %f]:", srange->min, srange->max);
			scanf("%s",inputchar);
			v = atof(inputchar);
			if(v >= srange->min && v <= srange->max) {
				for(i=0; i<N_SAMPLE; i++)
					data[i] = v/srange->max*4095;	
				break;
			}
			printf("Bad Voltage!\n");
		}	
		
		
		insn.chanspec = CR_PACK(channel, range, 0);

        	ret = comedi_do_insn(device, &insn);	//sample data
		save_errno = errno;

	        if(ret<0){
	        	comedi_perror(filename);
			exit(0);
        	}
   		 
        	printf("the voltage output!\n");

                printf("Press 'Q' to quit,  press other key to continue...\n");
                argument=getchar();
                if(argument == 'Q' || argument == 'q')
                	break;
	}
	return 1;
}