dig.c

来自「rt 7520采集卡 linux驱动源代码」· C语言 代码 · 共 47 行

/*
	FILE NAME: dig.c

	FILE DESCRIPTION:

		Example program which demonstrates writing to digital I/O port
		zero.

	PROJECT NAME: Linux DM7520 Driver, Library, and Example Programs

	PROJECT VERSION: (Defined in README.TXT)

	Copyright 2004 RTD Embedded Technologies, Inc.  All Rights Reserved.
*/

#include <stdio.h>	//printf
#include <stdlib.h> //exit
#include <unistd.h> //usleep
#include <errno.h>	//errno
#include "dm7520_library.h"

int main(int argc, char * argv[])
{
 FILE * infile;
 int i;

 if (argc<2) {fprintf(stderr, "Usage: %s <device>\n", argv[0]);exit(1);}
 if (NULL==(infile=fopen(argv[1],"r"))) 
   {
    fprintf(stderr,"Cannot open file, errno=%d\n",errno);
    perror("Error is");
    exit(2);
   }

 InitBoard7520(fileno(infile));

 SetDIO0Direction7520(fileno(infile),255); // set direction to output
 for (i=0;i<256;i++)
   {
    WriteDIO07520(fileno(infile),i); 
    usleep(100000);
   }
 fclose(infile);
 return(0); 
}