testkey.c

来自「这个源码相信对很多用arm开发板开发的人会有用的」· C语言 代码 · 共 57 行

#include <stdio.h>
#include <stdlib.h>	//system
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <linux/delay.h>
#include <sys/ioctl.h>


static unsigned int keysnd[16] = {900,  1000, 1100, 1200,
				  1300, 1400, 1500, 1600,
				  1700, 1800, 1900, 2000,
				  2100, 2200, 2300, 2400};

int main(int argc, char *argv[])
{
	char *devname[] = { "/dev/keypad/0",
			    NULL };
	char cmd[32];
	int i, fd = -1;
	char buf;
	
	for(i=0; devname[i]; i++) {
		fd = open(devname[i], O_RDONLY);
		if(fd<0)
			fprintf(stderr, "Open %s fail!\n", devname[i]);
		else {
			fprintf(stdout, "Open %s success\n", devname[i]);
			break;
		}
	}
	if(fd<0) {
		fprintf(stderr, "Can't find any keypad device!\n");
		return -1;
	}
	
	//getchar();

	while(1) {
		int i;

		i = read(fd, (char *)&buf, 1);
		if(i<0) {
			fprintf(stderr, "read fail! %d\n", i);
			break;
		}
		sprintf(cmd, "echo -ne '\033[10;%d]' > /dev/tty1", 
				keysnd[buf&0xf] + ((buf&0x80)?50:0));
		system(cmd);
		system("echo -ne '\a' > /dev/tty1");
		fprintf(stdout, "key 0x%x %s\n", 
			buf&0x7f, (buf&0x80) ? "up" : "down");
	}
	close(fd);
	return 0;
}