?? addrv_test.c
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#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; int CH; short result; if((fd=open("/dev/ad",O_RDWR))==-1) { perror("open error"); exit(1); } while(1) { Loop: printf("\n\rPlease Input Channel Number For Testing[0-7]:"); while ((CH = getchar()) != '\n') if(CH>'7') { printf("\n\rError,The Channel Number Must between 0 ~ 7\n\r"); goto Loop; } if((count=write(fd,(char *)&CH,1))!=1) { perror("write error"); exit(1); } if((count=read(fd,(char*)&result,2))!=2) { perror("read error"); exit(1); } printf("\n\rThe Input Voltage = %.2fv\n\r",result*10.0/4096.0); } close(fd); return 0; }
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