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/*! \file dkey.c
\brief Implementation: debounced key driver
\author Markus L. Noga <markus@noga.de>
*/
/*
* The contents of this file are subject to the Mozilla 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.mozilla.org/MPL/
*
* 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 legOS code, released October 17, 1999.
*
* The Initial Developer of the Original Code is Markus L. Noga.
* Portions created by Markus L. Noga are Copyright (C) 1999
* Markus L. Noga. All Rights Reserved.
*
* Contributor(s): Markus L. Noga <markus@noga.de>
*/
#include <dkey.h>
#ifdef CONF_DKEY
#include <unistd.h>
#include <sys/tm.h>
#ifdef CONF_AUTOSHUTOFF
#include <sys/timeout.h>
#endif
///////////////////////////////////////////////////////////////////////////////
//
// Global Variables
//
///////////////////////////////////////////////////////////////////////////////
volatile unsigned char dkey_multi; //! multi-key state
volatile unsigned char dkey; //! single key state
///////////////////////////////////////////////////////////////////////////////
//
// Internal Variables
//
///////////////////////////////////////////////////////////////////////////////
char dkey_timer __attribute__ ((unused)); //! debouncing timer
///////////////////////////////////////////////////////////////////////////////
//
// Functions
//
///////////////////////////////////////////////////////////////////////////////
#ifndef DOXYGEN_SHOULD_SKIP_THIS
__asm__("\n\
.text\n\
.align 1\n\
.global _dkey_handler\n\
_dkey_handler:\n\
mov.b @_dkey_timer,r6l ; check debouncing timer==0\n\
beq dkey_check\n\
\n\
dec r6l\n\
mov.b r6l,@_dkey_timer\n\
rts\n\
\n\
dkey_check:\n\
sub.b r6l,r6l ; generate button codes\n\
; from PORT4/PORT7 in r6l\n\
mov.b @_PORT4,r6h\n\
bld #1,r6h\n\
bist #0,r6l\n\
bld #2,r6h\n\
bist #1,r6l\n\
\n\
mov.b @_PORT7,r6h\n\
bld #6,r6h\n\
bist #2,r6l\n\
bld #7,r6h\n\
bist #3,r6l\n\
\n\
mov.b @_dkey_multi,r6h\n\
xor.b r6l,r6h ; create mask of changed positions in r6h\n\
beq dkey_same\n\
\n\
mov.b r6l,@_dkey_multi\n\
\n\
and.b r6h,r6l ; mask out unchanged positions\n\
mov.b r6l,@_dkey\n\
\n\
mov.b #100,r6l ; set debouncing timer\n\
mov.b r6l,@_dkey_timer\n\
\n\
dkey_same:\n\
rts\n\
");
#endif // DOXYGEN_SHOULD_SKIP_THIS
//! wakeup if any of the given keys is pressed.
//
wakeup_t dkey_pressed(wakeup_t data) {
#ifdef CONF_AUTOSHUTOFF
if (idle_powerdown) { // if idle too long, say the OFF key was pressed
dkey = KEY_ONOFF;
return KEY_ONOFF;
}
#endif
return (dkey & (unsigned char)data);
}
//! wakeup if all of the given keys are released.
//
wakeup_t dkey_released(wakeup_t data) {
return ! (dkey & (unsigned char)data);
}
//! get and return a single key press, after waiting for it to arrive
//
int getchar(void) {
wait_event(dkey_released,KEY_ANY);
#ifdef CONF_AUTOSHUTOFF
shutoff_restart();
#endif
wait_event(dkey_pressed ,KEY_ANY);
return dkey;
}
#endif // CONF_DKEY
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