keyboard.c

AT91RM9200的完整启动代码：包括loader, boot及U-boot三部分均已编译通过！欢迎下载使用！

/****************************************************************************
*
*                   SciTech OS Portability Manager Library
*
*  ========================================================================
*
*    The contents of this file are subject to the SciTech MGL Public
*    License Version 1.0 (the "License"); you may not use this file
*    except in compliance with the License. You may obtain a copy of
*    the License at http://www.scitechsoft.com/mgl-license.txt
*
*    Software distributed under the License is distributed on an
*    "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
*    implied. See the License for the specific language governing
*    rights and limitations under the License.
*
*    The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc.
*
*    The Initial Developer of the Original Code is SciTech Software, Inc.
*    All Rights Reserved.
*
*  ========================================================================
*
* Language:     ANSI C
* Environment:  Any
*
* Description:  Direct keyboard event handling module. This module contains
*               code to process raw scan code information, convert it to
*               virtual scan codes and do code page translation to ASCII
*               for different international keyboard layouts.
*
****************************************************************************/

/*---------------------------- Implementation -----------------------------*/

/****************************************************************************
PARAMETERS:
scanCode    - Keyboard scan code to translate
table       - Code page table to search
count       - Number of entries in the code page table

REMARKS:
This function translates the scan codes from keyboard scan codes to ASCII
codes using a binary search on the code page table.
****************************************************************************/
static uchar translateScan(
    uchar scanCode,
    codepage_entry_t *table,
    int count)
{
    codepage_entry_t    *test;
    int                 n,pivot,val;

    for (n = count; n > 0; ) {
        pivot = n >> 1;
        test = table + pivot;
        val = scanCode - test->scanCode;
        if (val < 0)
            n = pivot;
        else if (val == 0)
            return test->asciiCode;
        else {
            table = test + 1;
            n -= pivot + 1;
            }
        }
    return 0;
}

/****************************************************************************
REMARKS:
This macro/function is used to converts the scan codes reported by the
keyboard to our event libraries normalised format. We only have one scan
code for the 'A' key, and use shift modifiers to determine if it is a
Ctrl-F1, Alt-F1 etc. The raw scan codes from the keyboard work this way,
but the OS gives us 'cooked' scan codes, we have to translate them back
to the raw format.
{secret}
****************************************************************************/
void _EVT_maskKeyCode(
    event_t *evt)
{
    int ascii,scan = EVT_scanCode(evt->message);

    evt->message &= ~0xFF;
    if (evt->modifiers & EVT_NUMLOCK) {
        if ((ascii = translateScan(scan,EVT.codePage->numPad,EVT.codePage->numPadLen)) != 0) {
            evt->message |= ascii;
            return;
            }
        }
    if (evt->modifiers & EVT_CTRLSTATE) {
        evt->message |= translateScan(scan,EVT.codePage->ctrl,EVT.codePage->ctrlLen);
        return;
        }
    if (evt->modifiers & EVT_CAPSLOCK) {
        if (evt->modifiers & EVT_SHIFTKEY) {
            if ((ascii = translateScan(scan,EVT.codePage->shiftCaps,EVT.codePage->shiftCapsLen)) != 0) {
                evt->message |= ascii;
                return;
                }
            }
        else {
            if ((ascii = translateScan(scan,EVT.codePage->caps,EVT.codePage->capsLen)) != 0) {
                evt->message |= ascii;
                return;
                }
            }
        }
    if (evt->modifiers & EVT_SHIFTKEY) {
        if ((ascii = translateScan(scan,EVT.codePage->shift,EVT.codePage->shiftLen)) != 0) {
            evt->message |= ascii;
            return;
            }
        }
    evt->message |= translateScan(scan,EVT.codePage->normal,EVT.codePage->normalLen);
}

/****************************************************************************
REMARKS:
Returns true if the key with the specified scan code is being held down.
****************************************************************************/
static ibool _EVT_isKeyDown(
    uchar scanCode)
{
    if (scanCode > 0x7F)
        return false;
    else
        return EVT.keyTable[scanCode] != 0;
}

/****************************************************************************
PARAMETERS:
what        - Event code
message     - Event message (ASCII code and scan code)

REMARKS:
Adds a new keyboard event to the event queue. This routine is called from
within the keyboard interrupt subroutine!

NOTE:   Interrupts are OFF when this routine is called by the keyboard ISR,
        and we leave them OFF the entire time.
****************************************************************************/
static void addKeyEvent(
    uint what,
    uint message)
{
    event_t evt;

    if (EVT.count < EVENTQSIZE) {
        /* Save information in event record */
        evt.when = _EVT_getTicks();
        evt.what = what;
        evt.message = message | 0x10000UL;
        evt.where_x = 0;
        evt.where_y = 0;
        evt.relative_x = 0;
        evt.relative_y = 0;
        evt.modifiers = EVT.keyModifiers;
        if (evt.what == EVT_KEYREPEAT) {
            if (EVT.oldKey != -1)
                EVT.evtq[EVT.oldKey].message += 0x10000UL;
            else {
                EVT.oldKey = EVT.freeHead;
                addEvent(&evt);         /* Add to tail of event queue   */
                }
            }
        else {
#ifdef __QNX__
            _EVT_maskKeyCode(&evt);
#endif
            addEvent(&evt);             /* Add to tail of event queue   */
            }
        EVT.oldMove = -1;
        }
}

/****************************************************************************
REMARKS:
This function waits for the keyboard controller to set the ready-for-write
bit.
****************************************************************************/
static int kbWaitForWriteReady(void)
{
    int timeout = 8192;
    while ((timeout > 0) && (PM_inpb(0x64) & 0x02))
        timeout--;
    return (timeout > 0);
}

/****************************************************************************
REMARKS:
This function waits for the keyboard controller to set the ready-for-read
bit.
****************************************************************************/
static int kbWaitForReadReady(void)
{
    int timeout = 8192;
    while ((timeout > 0) && (!(PM_inpb(0x64) & 0x01)))
        timeout--;
    return (timeout > 0);
}

/****************************************************************************
PARAMETERS:
data    - Data to send to the keyboard

REMARKS:
This function sends a data byte to the keyboard controller.
****************************************************************************/
static int kbSendData(
    uchar data)
{
    int resends = 4;
    int timeout, temp;

    do {
        if (!kbWaitForWriteReady())
            return 0;
        PM_outpb(0x60,data);
        timeout = 8192;
        while (--timeout > 0) {
            if (!kbWaitForReadReady())
                return 0;
            temp = PM_inpb(0x60);
            if (temp == 0xFA)