#include <stdlib.h> 
#include <sys/ioctl.h> 
#include <sys/stat.h> 
#include <fcntl.h> 
#include <unistd.h> 

#define SPIDEVICE "/dev/spi" 

int main() 
{ 
int fd; 
int i=1; 
int *buf; 
printf("now,spi test program begining!\n"); 
buf=&i; 
fd=open(SPIDEVICE,O_RDWR|O_NONBLOCK); 
if(fd<0) 
{ 
perror(SPIDEVICE); 
exit(-1); 
} 

while(1) 
{ 
getchar(); 
write(fd,buf,0); 
} 
}