readnrf2401.c

来自「组网协议设计中」· C语言 代码 · 共 41 行

#include<stdio.h>
#include<sys/types.h>
#include<fcntl.h>
#include<sys/stat.h>
#include<unistd.h>
#include<sys/select.h>
#include<errno.h>

#define DEVICE_NAME "nRF2401"
#define DEV_PATH    "/dev/nRF2401/nRF2401"

int main(int argc,char **argv)
{
	int nRF2401_fd;
	ssize_t len;
	int ret,i;
	fd_set rds;
	unsigned char value[22];
	nRF2401_fd=open(DEV_PATH,O_RDWR);
	if(nRF2401_fd<0){
		perror(DEVICE_NAME" open");
		exit(1);
		}
   while(1){
	FD_ZERO(&rds);
	FD_SET(nRF2401_fd,&rds);
	ret=select(nRF2401_fd+1,&rds,NULL,NULL,NULL);
	if(ret<0){	
		perror("select");
		exit(1);
	 	}
	if(FD_ISSET(nRF2401_fd,&rds)){
		ret=read(nRF2401_fd,value,22);
		if(ret!=22)printf("read error");
		for(i=0;i<22;i++)printf("%d ",value[i]);
		printf("\n");	
		}
	}	
  	close(nRF2401_fd);  	
}