61 lines
2.5 KiB
C
61 lines
2.5 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: Speaker functions //
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// //
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// //
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// Copyright © 2018-2019 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 3 of the License, or //
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// any later version. //
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// //
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// OS/K is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY//without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <kernel/speaker.h>
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#include <kernel/iomisc.h>
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#include <kernel/time.h>
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void IoStartSpeaker(int freq)
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{
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char temp;
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int pitf = 1193180 / freq;
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IoWriteByteOnPort(0x43, 0xB6);
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IoWriteByteOnPort(0x42, (char)pitf);
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IoWriteByteOnPort(0x42, (char)(pitf >> 8));
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temp = IoReadByteFromPort(0x61);
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if (temp != (temp | 3)) {
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IoWriteByteOnPort(0x61, temp | 3);
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}
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}
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void IoQuietSpeaker(void)
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{
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IoWriteByteOnPort(0x61, IoReadByteFromPort(0x61) & 0xFC);
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}
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void IoDoBeep(void)
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{
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IoStartSpeaker(1000);
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// Worst possible way of waiting
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// We need actual timers
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ulong ticks = IoGetRtcTicks();
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while (IoGetRtcTicks() < ticks + 1024);
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IoQuietSpeaker();
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}
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