kb_read.c

ARM9200+嵌入式linux下键盘驱动

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <pthread.h>
#include "kb_read.h"
#define KEYBOARD "/dev/keyboard/0raw"

int fd_kb;

/**********************************************************/
int kb_open(void)
{
	fd_kb = open(KEYBOARD, O_RDONLY ); //| O_NONBLOCK);
	if (fd_kb < 0) {
		printf("%s - Can't open keyboard!\n", __FUNCTION__);
		return -1;
	}
	return 0;
}
/**********************************************************/
int kb_close(void)
{
	close(fd_kb);
	return 0;
}
/**********************************************************/
static char kb_map(char scancode)
{
	int i,j;
	int key_count=16;
	char keymap[16]={
		'1','2','3','4',
		'5','6','7','8',
		'9','0','A','B',
		'C','D','E','F'
	};
	char scode[16]={
		4,5,6,7,
		0x14,0x15,0x16,0x17,
		0x24,0x25,0x26,0x27,
		0x34,0x35,0x36,0x37
	};
	for(i=0; i<key_count; i++){
		if(scancode==scode[i]){
			//printf("i=%d\n",i,keymap[i]);
			return keymap[i];
		}
	}
	return -1;
}
/**********************************************************/
char kb_read(void)
{
	int keydown=0,old_keydown;
	char  key=0; 
	char scancode;
	int cc;
	
	while(1){
		cc = read(fd_kb, &scancode, 1);
		if(cc <0){
			printf("read keyboard fail!\n");
			return -1;
		}
		if(scancode &0x80)keydown =1;
		if(keydown==1){// 2: key up
			key = scancode & 0x70 | (scancode & 0xf -1)>>1;
			//printf("key=%x\n",key);
			break;
		}
		//else printf("key up: %x\n",scancode);
	}
	return kb_map(key);
}
/**********************************************************/
#define ENTER 'F'
int kb_get_line(char *cmd)
{
	
	int i=0;
	while(1){
		cmd[i]=kb_read();
		if(cmd[i] == ENTER){
			cmd[i]=0;
			break;
		}
		printf("%c",cmd[i]);
		fflush(stdout);
		i++;
	}
	return 0;
}