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/*! \file dsound.c
\brief Implementation: direct sound control
\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>
* Michael Nielsen <mic@daimi.aau.dk>
* Kyosuke Ishikawa <kyosuke@da2.so-net.ne.jp>
* Martin Cornelius <Martin.Cornelius@t-online.de>
*/
#include <sys/dsound.h>
#ifdef CONF_DSOUND
#include <sys/bitops.h>
#include <sys/h8.h>
#include <sys/irq.h>
#include <conio.h>
#include <sys/tm.h>
///////////////////////////////////////////////////////////////////////////////
//
// Variables
//
///////////////////////////////////////////////////////////////////////////////
//! note pitch -> frequency generator lookup table, index 0 ^= A0
static const unsigned pitch2freq[]={
0x8d03, 0x8603, 0x7d03, 0x7703, 0x7003, 0x6a03, 0x6303, 0x5e03,
0x5903, 0x5403, 0x4f03, 0x4a03, 0x4603, 0x4203, 0xfd83, 0xee83,
0xe083, 0xd483, 0xc783, 0xbc83, 0xb283, 0xa883, 0x9e83, 0x9583,
0x8d83, 0x8583, 0x7e83, 0x7683, 0x7083, 0x6983, 0x6383, 0x5e83,
0x5983, 0x5383, 0x4f83, 0x4a83, 0x4683, 0x4283, 0xfc02, 0xee02,
0xe102, 0xd402, 0xc802, 0xbd02, 0xb202, 0xa802, 0x9e02, 0x9502,
0x8d02, 0x8502, 0xfc82, 0xee82, 0xe082, 0xd482, 0xc882, 0xbd82,
0xb282, 0xa882, 0x9e82, 0x9682, 0x8d82, 0x8582, 0x7e82, 0x7682,
0x7082, 0x6982, 0x6382, 0x5e82, 0x5882, 0x5382, 0x4f82, 0x4a82,
0x4682, 0x4282, 0xfc01, 0xee01, 0xe001, 0xd401, 0xc801, 0xbd01,
0xb201, 0xa801, 0x9e01, 0x9501, 0x8d01, 0x8501, 0x7e01, 0x7601,
0x7001, 0x6901, 0x6301, 0x5e01, 0x5801, 0x5301, 0x4f01, 0x4a01,
0x4601
};
//! single beep
static const note_t sys_beep[]={
{PITCH_A4 , 1}, {PITCH_END, 0}
};
//! system sound data
const note_t *dsound_system_sounds[]={
sys_beep
};
unsigned dsound_16th_ms; //!< length of 1/16 note in ms
unsigned dsound_internote_ms; //!< length of internote spacing in ms
volatile note_t *dsound_next_note; //!< pointer to current note
volatile time_t dsound_next_time; //!< when to play next note
static volatile int internote; //!< internote delay flag
//////////////////////////////////////////////////////////////////////////////
//
// Internal Functions
//
///////////////////////////////////////////////////////////////////////////////
//! start playing a given frequency
static inline void play_freq(unsigned freq) {
unsigned char CKSmask = freq & 0xff;
unsigned char match = freq >> 8;
T0_CR = 0x00; // timer off
T0_CNT = 0x00; // counter reset
#if 0
bit_load(CKSmask,0x7); // set ICKS0
bit_store(&STCR,0x0);
#else
if (CKSmask & 0x80)
STCR |= 0x01; // ICKS0 = 1
else
STCR &= ~0x01; // ICKS0 = 0
#endif
T0_CORA = match; // set compare match A
T0_CR = CR_CLEAR_ON_A | (CKSmask &0x3);
}
//! start playing a pause (aka stop playing freq)
static inline void play_pause() {
T0_CR = 0x00; // timer 0 off
}
//////////////////////////////////////////////////////////////////////////////
//
// System functions
//
///////////////////////////////////////////////////////////////////////////////
//! sound handler, called from system timer interrupt
#ifdef CONF_RCX_COMPILER
void dsound_handler(void) {
#else
HANDLER_WRAPPER("dsound_handler","dsound_core");
//! sound core, called from ????
void dsound_core(void) {
#endif
if (get_system_up_time() >= dsound_next_time) {
if(internote) {
play_pause();
dsound_next_time = get_system_up_time() + dsound_internote_ms;
internote=0;
return;
}
if(dsound_next_note) {
unsigned char pitch =dsound_next_note->pitch;
if(pitch<PITCH_MAX) {
if(pitch!=PITCH_PAUSE)
play_freq(pitch2freq[pitch]);
else
play_pause();
dsound_next_time = get_system_up_time() + dsound_16th_ms * dsound_next_note->length
- dsound_internote_ms;
dsound_next_note++;
internote=1;
return;
}
}
dsound_stop();
}
}
//! initialize sound driver
void dsound_init() {
dsound_16th_ms=DSOUND_DEFAULT_16th_ms;
dsound_internote_ms=DSOUND_DEFAULT_internote_ms;
dsound_stop();
T0_CSR = CSR_TOGGLE_ON_A; // Output toggles on compare Match A
}
//! shutdown sound driver
void dsound_shutdown() {
dsound_stop();
}
//////////////////////////////////////////////////////////////////////////////
//
// User functions
//
///////////////////////////////////////////////////////////////////////////////
//! stop playing sound
void dsound_stop(void) {
play_pause();
dsound_next_note=0;
dsound_next_time=0xffffffff;
internote=0;
}
//! sound finished event wakeup function
wakeup_t dsound_finished(wakeup_t data) {
return !dsound_playing();
}
#endif // CONF_DSOUND
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