69 lines
1.7 KiB
C++
69 lines
1.7 KiB
C++
/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along
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with Sortix. If not, see <http://www.gnu.org/licenses/>.
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sound.h
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Implements a simple sound system.
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******************************************************************************/
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#include <sortix/kernel/platform.h>
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#include "sound.h"
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#include "syscall.h"
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namespace Sortix
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{
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namespace Sound
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{
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void Mute()
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{
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uint8_t TMP = (CPU::InPortB(0x61)) & 0xFC;
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CPU::OutPortB(0x61, TMP);
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}
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void Play(nat Frequency)
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{
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//Set the PIT to the desired frequency
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uint32_t Div = 1193180 / Frequency;
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CPU::OutPortB(0x43, 0xB6);
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CPU::OutPortB(0x42, (uint8_t) (Div) );
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CPU::OutPortB(0x42, (uint8_t) (Div >> 8));
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// And play the sound using the PC speaker
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uint8_t TMP = CPU::InPortB(0x61);
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if ( TMP != (TMP | 3) )
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{
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CPU::OutPortB(0x61, TMP | 3);
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}
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}
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void SysSetFrequency(unsigned frequency)
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{
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if ( frequency == 0 ) { Mute(); } else { Play(frequency); }
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}
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void Init()
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{
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Syscall::Register(SYSCALL_SET_FREQUENCY, (void*) SysSetFrequency);
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}
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}
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}
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