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54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/*
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* PROJECT: NEC PC-98 series HAL
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* LICENSE: GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
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* PURPOSE: Speaker support (beeping)
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* COPYRIGHT: Copyright 2020 Dmitry Borisov (di.sean@protonmail.com)
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*/
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/* INCLUDES ******************************************************************/
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#include <hal.h>
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#define NDEBUG
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#include <debug.h>
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/* FUNCTIONS *****************************************************************/
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BOOLEAN
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NTAPI
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HalMakeBeep(
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_In_ ULONG Frequency)
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{
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TIMER_CONTROL_PORT_REGISTER TimerControl;
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ULONG Divider;
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BOOLEAN Success = FALSE;
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HalpAcquireCmosSpinLock();
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__outbyte(PPI_IO_o_CONTROL, PPI_TIMER_1_UNGATE_TO_SPEAKER);
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if (Frequency)
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{
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Divider = PIT_FREQUENCY / Frequency;
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if (Divider <= 0x10000)
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{
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TimerControl.BcdMode = FALSE;
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TimerControl.OperatingMode = PitOperatingMode3;
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TimerControl.Channel = PitChannel1;
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TimerControl.AccessMode = PitAccessModeLowHigh;
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__outbyte(TIMER_CONTROL_PORT, TimerControl.Bits);
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__outbyte(TIMER_CHANNEL1_DATA_PORT, FIRSTBYTE(Divider));
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__outbyte(TIMER_CHANNEL1_DATA_PORT, SECONDBYTE(Divider));
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__outbyte(PPI_IO_o_CONTROL, PPI_TIMER_1_GATE_TO_SPEAKER);
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Success = TRUE;
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}
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}
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HalpReleaseCmosSpinLock();
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return Success;
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}
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