dadrv_test.c

来自「Linux环境下AD和DA驱动源码」· C语言 代码 · 共 63 行

#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>

int main(void)
{
    int fd,count;
    char CH;
    int v0=0xffff0000,v10P=0x7fff0000, v10N=0x80000000,v5P=0x3fff0000;     

    if((fd=open("/dev/da",O_RDWR))==-1)
                {
                perror("open error");
                exit(1);
                }
      
   
      
      printf("Please Input Channel Number For Testing[0/1]:");
      CH = getchar();
      if((count=write(fd,(char *)&CH,1))!=1)
                        {
                        perror("write error");
                        exit(1);
                        }
      printf("\n\rConvting ...");
      if((count=write(fd,(char*)&v0,4))!=4)
                        {
			perror("write error");
			exit(1);
                        }
      if((count=write(fd,(char*)&v10P,4))!=4)
                        {
                        perror("write error");
                        exit(1);
                        }
      if((count=write(fd,(char*)&v10N,4))!=4)
                        {
                        perror("write error");
                        exit(1);
                        }
      if((count=write(fd,(char*)&v5P,4))!=4)
                        {
                        perror("write error");
                        exit(1);
                        }
      if((count=write(fd,(char*)&v0,4))!=4)
                        {
                        perror("write error");
                        exit(1);
                        }
      printf("Ok!\n\r");
         
close(fd);
return 0;
}