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Eric's beep driver and changes for same

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svn path=/trunk/; revision=286
This commit is contained in:
Rex Jolliff 1999-03-10 06:39:59 +00:00
parent 3a2897ef52
commit 275be13b58
2 changed files with 85 additions and 0 deletions
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15
reactos/include/ddk/ntddbeep.h Normal file
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#ifndef _BEEP_H_INCLUDED_
#define _BEEP_H_INCLUDED_
#define IOCTL_BEEP_SET CTL_CODE(FILE_DEVICE_BEEP,0,METHOD_BUFFERED,FILE_ANY_ACCESS)
typedef struct tagBEEP_SET_PARAMETERS
{
ULONG Frequency;
ULONG Duration;
} BEEP_SET_PARAMETERS, *PBEEP_SET_PARAMETERS;
#define BEEP_FREQUENCY_MINIMUM 0x25
#define BEEP_FREQUENCY_MAXIMUM 0x7FFF
#endif /* _BEEP_H_INCLUDED_ */

70
reactos/ntoskrnl/hal/x86/beep.c Normal file
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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/hal/x86/beep.c
* PURPOSE: Speaker function (it's only one)
* PROGRAMMER: Eric Kohl (ekohl@abo.rhein-zeitung.de)
* UPDATE HISTORY:
* Created 31/01/99
*/
/* INCLUDES *****************************************************************/
#include <ddk/ntddk.h>
//#include <internal/debug.h>
#include <internal/i386/io.h>
/* CONSTANTS *****************************************************************/
#define TIMER2 0x42
#define TIMER3 0x43
#define PORT_B 0x61
#define CLOCKFREQ 1193167
/* FUNCTIONS *****************************************************************/
/*
* FUNCTION: Beeps the speaker.
* ARGUMENTS:
* Frequency = If 0, the speaker will be switched off, otherwise
* the speaker beeps with the specified frequency.
*/
BOOLEAN
HalMakeBeep(ULONG Frequency)
{
/* save flags and disable interrupts */
__asm__("pushf\n\t" \
"cli\n\t");
/* speaker off */
outb_p(PORT_B, inb_p(PORT_B) & 0xFC);
if (Frequency)
{
DWORD Divider = CLOCKFREQ / Frequency;
if (Divider > 0x10000)
{
/* restore flags */
__asm__("popf\n\t");
return FALSE;
}
/* set timer divider */
outb_p(TIMER3, 0xB6);
outb_p(TIMER2, (UCHAR)(Divider & 0xFF));
outb_p(TIMER2, (UCHAR)((Divider>>8) & 0xFF));
/* speaker on */
outb_p(PORT_B, inb_p(PORT_B) | 0x03);
}
/* restore flags */
__asm__("popf\n\t");
return TRUE;
}