test.c

来自「基于AT91RM9200 板卡的OLED Linux 驱动程序」· C语言 代码 · 共 19 行

#include <stdio.h>
#include <fcntl.h>
int fd;

int main()
{
	int key[1];
	fd=open("/dev/key", O_RDWR );         //| O_NOCTTY | O_NDELAY	
	if (fd==-1)	
	{
		printf("led device file open failed\n");
		return -1;	
	}
	while(1)
	{
		if(read(fd, key, 4)>0)
		printf("key = %x\n",key[0]);
	}
}