mirror of
https://github.com/RGBCube/serenity
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27f699ef0c
These types can be picked up by including <AK/Types.h>: * u8, u16, u32, u64 (unsigned) * i8, i16, i32, i64 (signed)
20 lines
489 B
C++
20 lines
489 B
C++
#include <Kernel/Arch/i386/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/i8253.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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