pwm.h

SM501基于ARMV4/ARMV4I平台

//-----------------------------------------------------------------------------
//
//  THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
//  ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
//  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
//  PARTICULAR PURPOSE.
//  Copyright (c) 2003 Silicon Motion, Inc.
//
//  Module Name:	pwm.cpp
//
//  Abstract:		Pulse Width Modulation API
//
//-----------------------------------------------------------------------------

#ifndef _PWM_H_
#define _PWM_H_


///////////////////////////////////////////////////////////////////////////////
// PWM Interrupt Event Names.

#define PWM0_INT_EVENT_NAME TEXT("VGX-PWM0-INT-70D34510-CEEE-42a2-BA7E-66045FEA170C")
#define PWM1_INT_EVENT_NAME TEXT("VGX-PWM1-INT-70D34510-CEEE-42a2-BA7E-66045FEA170C")
#define PWM2_INT_EVENT_NAME TEXT("VGX-PWM2-INT-70D34510-CEEE-42a2-BA7E-66045FEA170C")


///////////////////////////////////////////////////////////////////////////////
// PWM return results.

typedef enum _VGXPWM_RESULTS
{
	VGXPWM_SUCCESS				= 1,
	VGXPWM_INVALID_PARAMETER	= -1,
	VGXPWM_EVENT_FAILED			= -2,
	VGXPWM_INT_NOT_SUPPORTED	= -3
}
VGXPWM_RESULTS, *PVGXPWM_RESULTS;


///////////////////////////////////////////////////////////////////////////////
// PWM index constants to access PWM0, PWM1 and PWM2.

typedef enum _VGXPWM_INDEX
{
	VGXPWM0,
	VGXPWM1,
	VGXPWM2,

	VGXPWMCOUNT
}
VGXPWM_INDEX, *PVGXPWM_INDEX;


///////////////////////////////////////////////////////////////////////////////
// PWM Management internal structure.

typedef struct
{
	BOOL   bPWMEnabled;			// Enabled flag
	DWORD  PWMAddress;			// I/O Port
	HANDLE hIntEvent;			// Interrupt Event handle
	LPTSTR lpszIntEventName;	// Event name
	WORD   wLowCounter;			// Low counter
	WORD   wHighCounter;		// High counter
	BYTE   byClockDivider;		// Clock divider
	BOOL   bIntEnable;			// Interrupt enable
}
PWM_STRUCT;


///////////////////////////////////////////////////////////////////////////////
// Command constants for use with VGXPWM_STRUCT.

typedef enum _VGXPWM_COMMANDS
{
	VGXPWMCMD_INIT,
	VGXPWMCMD_START,
	VGXPWMCMD_STOP
}
VGXPWM_COMMANDS, *PVGXPWM_COMMANDS;


///////////////////////////////////////////////////////////////////////////////
// Structure used in ExtEscape calls to access PWM API.

typedef struct _VGXPWM_STRUCT
{
	VGXPWM_COMMANDS Command;	// One of VGXPWM_COMMANDS
	VGXPWM_INDEX PWMIndex;		// VGXPWM0, VGXPWM1 or VGXPWM2

	// VGXPWMCMD_INIT parameters
	WORD wLowCounter;			// Low counter
	WORD wHighCounter;			// High counter
	BYTE byClockDivider;		// Clock divider
	BOOL bIntEnable;			// Interrupt flag
}
VGXPWM_STRUCT, *PVGXPWM_STRUCT;


#endif