getinfo.c

来自「Xilinx ISE&EDK 8.2平台的快速点餐系统设计」· C语言 代码 · 共 24 行

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>

#define LEDFILE "/dev/xup_v2pro_led"
#define DIPFILE "/dev/xup_v2pro_dip"

int main()
{
	unsigned char c2;
	int diphandle = open(DIPFILE, O_RDWR);
	printf("Content-type: text/plain\n\n");
	if(read (diphandle, &c2, 1, 0) < 0)
	        printf("error\n");
	else
	        printf("%d\n",c2);
	close(diphandle);
	fflush(stdout);
	return 0;


}