keyboard.c,v

一个小型的操作系统,采用gcc进行开发,几千行的代码,方便初学者学习

head	1.3;
access;
symbols;
locks
	root:1.3; strict;
comment	@ * @;


1.3
date	2004.06.11.22.42.56;	author root;	state Exp;
branches;
next	1.2;

1.2
date	2004.04.06.12.33.16;	author oracle;	state Exp;
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next	1.1;

1.1
date	2004.03.01.12.37.18;	author oracle;	state Exp;
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desc
@rewrite keyboard handler in C, ported from int.asm ,remove the counterpart in asm code
@


1.3
log
@add new function:
moveHead(): advance dequeue pointer
moveTail(): advance enqueue pointer
keyEmpty(): if keyborad buffer emtpy then return 1, else return 0
getKey()  : return asciiKey if called when keyboard buffer is not empty
getScan() : return scancode  if called when keyboard buffer is not empty
readKeybd(char *ascii, char *scan): both function of getKey() and getScan()
@
text
@/*

  Snixos Project version 1.0, 2003.6
  (C) Copyright 2003-2004 Snallie Jockeyson <Snallie@@tom.com>
  All Rights Reserved.
  Distributed under the terms of the GNU General Public License.

  keyboard.c: keyboard interrupt handler in C
  Author  : snallie@@tom.com
  Time    : 2004.3
  $Id: keyboard.c,v 1.32 2004/06/07 10:51:32 root Exp $
  built   : $Date: 2004/06/07 10:51:32 $
  $Revision: 1.32 $
*/

#include "keyboard.h"
#include "io.h"
#include "stdio.h"

unsigned char ascTab[] = {
    /*0xff */ ' ', 0x1b, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
    '-',
    '=', 0x08, 0x09, 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[',
    ']', 0x0a, ' ', 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';',
    '\'', ' ', ' ', ' ', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.',
    '/', ' ', ' ', ' ', ' '
};

typedef struct kbuf {
    char scan;
    char ascii;
} keybuf;

keybuf keyBufs[KBSIZE];

int keyHead = 0;
int keyTail = 0;

#define keybdTail (keyBufs+keyTail)
#define keybdHead (keyBufs+keyHead)

static void moveHead();
static void moveTail();

/*
keyBdHandle()
convert scancode to ascii, store scancode/asciicode to buffer queue, adjust enque
pointer, then return.
*/
void keyBdHandle()
{
    unsigned char scanCode;

    scanCode = inb(KBDATAPORT);
    if (scanCode >= 0x80)	//released or pressed (bit7=0 means pressed)
	goto bye;

    if ((keyTail + 1) % KBSIZE == keyHead) {
	printf("keyboard buffer full\n");
	goto bye;
    }

    keybdTail->scan = scanCode;
    keybdTail->ascii = ascTab[scanCode];
    moveTail();

  bye:
    // send reset signal to keyboard
    scanCode = inb(KBCTRLPORT);
    scanCode || 0x80;
    outb(KBCTRLPORT, scanCode);
    scanCode = inb(KBCTRLPORT);
    scanCode && 0x7f;
    outb(KBCTRLPORT, scanCode);

    // send EOI to 8259 
    outb(0x20, 0x20);		//EOI
}


static void moveHead()
{
    keyHead = (keyHead + 1) % KBSIZE;
}

static void moveTail()
{
    keyTail = (keyTail + 1) % KBSIZE;
}

// if keyborad buffer emtpy then return 1, else return 0
int keyEmpty()
{
    return ((keyHead % KBSIZE) == keyTail ? 1 : 0);
}

char getKey()
{
    char a;
    while (1) {
	if (!keyEmpty())
	    break;
    }
    a = keybdHead->ascii;
    moveHead();
    return a;
}

char getScan()
{
    char a;
    while (1) {
	if (!keyEmpty())
	    break;
    }
    a = keybdHead->scan;
    moveHead();
    return a;
}


void readKeybd(char *ascii, char *scan ){
  while (1) {
    if (!keyEmpty())
      break;
  }
  *ascii = keybdHead->ascii;
  *scan = keybdHead->scan;
  moveHead();
}




@


1.2
log
@correct the syntax error for character constant definition '10' in array char ascTab[]
@
text
@d11 3
a13 3
  $Id: keyboard.c,v 1.1 2004/03/01 12:37:18 oracle Exp oracle $
  built   : $Date: 2004/03/01 12:37:18 $
  $Revision: 1.1 $
d21 6
a26 5
  /*0xff*/' ', 0x1b, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0','-',
  '=', 0x08, 0x09, 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[',
  ']', 0x0a, ' ', 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';',
  '\'', ' ', ' ', ' ', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.',
  '/', ' ', ' ', ' ', ' '
d28 16
a43 8
/*
char keyBufs[KBSIZE];
int keyHeads = 0;
int keyTails = 0;
*/
char *keyBuf;
int *keyHead;
int *keyTail;
d58 1
a58 1
    if ((*keyTail + 2) % KBSIZE == *keyHead) {
d63 3
a65 4
    keyBuf[*keyTail % KBSIZE + 1] = ascTab[scanCode];
    keyBuf[*keyTail % KBSIZE + 0] = scanCode;
    *keyTail = (*keyTail + 2) % KBSIZE;
//    printf("@@%x(%x)@@",ascTab[scanCode],scanCode);
d79 56
@


1.1
log
@Initial revision
@
text
@d8 1
a8 1
  keyboard.c: keyboard handler 
d11 3
a13 3
  $Id: kernel.c,v 1.5 2004/02/14 10:39:34 oracle Exp oracle $
  built   : $Date: 2004/02/14 10:39:34 $
  $Revision: 1.5 $
d18 1
d21 5
a25 6
    /*0xff */ ' ', 0x1b, '1', '2', '3', '4', '5', '6', '7', '8', '9', '10',
	'-',
    '=', 0x08, 0x09, 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[',
    ']', 0x0a, ' ', 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';',
    '\'', ' ', ' ', ' ', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.',
    '/'
d27 14
a40 4
char keyBuf[KBSIZE];
int keyHead = 0;
int keyTail = 0;

d49 1
a49 1
    if ((keyTail + 2) % KBSIZE == keyHead) {
d54 4
a57 3
    keyBuf[keyTail % KBSIZE + 1] = ascTab[scanCode];
    keyBuf[keyTail % KBSIZE + 0] = scanCode;
    keyTail = (keyTail + 2) % KBSIZE;
d59 1
a59 1
  bye: 
d69 1
a69 1
    outb(0x20, 0x20); //EOI
@