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SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
27 lines
608 B
C++
27 lines
608 B
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Arch/x86/CPU.h>
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#include <Kernel/Devices/PCSpeaker.h>
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#include <Kernel/IO.h>
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#include <Kernel/Time/PIT.h>
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void PCSpeaker::tone_on(int frequency)
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{
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IO::out8(PIT_CTL, TIMER2_SELECT | WRITE_WORD | MODE_SQUARE_WAVE);
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u16 timer_reload = BASE_FREQUENCY / frequency;
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IO::out8(TIMER2_CTL, LSB(timer_reload));
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IO::out8(TIMER2_CTL, MSB(timer_reload));
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IO::out8(0x61, IO::in8(0x61) | 3);
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}
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void PCSpeaker::tone_off()
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{
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IO::out8(0x61, IO::in8(0x61) & ~3);
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}
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