bsppwm.c

Freescale ARM11系列CPU MX31的WINCE 5.0下的BSP

//-----------------------------------------------------------------------------
//
//  Copyright (C) 2004, Motorola Inc. All Rights Reserved
//
//------------------------------------------------------------------------------
//
// Copyright (C) 2006, Freescale Semiconductor, Inc. All Rights Reserved.
// THIS SOURCE CODE, AND ITS USE AND DISTRIBUTION, IS SUBJECT TO THE TERMS
// AND CONDITIONS OF THE APPLICABLE LICENSE AGREEMENT
//
//------------------------------------------------------------------------------

//-----------------------------------------------------------------------------
//
//  File:  bsppwm.c
//
//   This file implements the BSP specific functions for PWM.
//
//-----------------------------------------------------------------------------
#include <windows.h>
#include "bsp.h"

//-----------------------------------------------------------------------------
// External Variables

//-----------------------------------------------------------------------------
// Defines
//------------------------------------------------------------------------------

// This will define the choice of clock source in PWMCR register
#define PWM_CLKSRC_VAL    PWM_PWMCR_CLKSRC_IPG_CLK_32K

//------------------------------------------------------------------------------
// Types

//------------------------------------------------------------------------------
// Global Variables

//------------------------------------------------------------------------------
// Local Variables

//------------------------------------------------------------------------------
// Local Functions

//------------------------------------------------------------------------------
//
// Function: BSPSetClockSource
//
// This function returns the BSP-specific clock
// source selection value for the PWM.
//
// Parameters:
//      None
//
// Returns:
//      The clock source for the PWM.
//
//------------------------------------------------------------------------------
UINT32 BSPSetPWMClockSource(void)
{
     return PWM_CLKSRC_VAL;
}

//------------------------------------------------------------------------------
//
// Function: BSPPwmSetClockGatingMode
//
// This function enable or disable CRM clock for PWM.
//
// Parameters:
//      startClocks
//          [in] boolean variable to enable or disable CRM clock
//
// Returns:
//      Return TRUE.
//
//------------------------------------------------------------------------------
BOOL BSPPwmSetClockGatingMode(BOOL startClocks)
{
    BOOL rc;

    if (startClocks)
    {
        rc = DDKClockSetGatingMode(DDK_CLOCK_GATE_INDEX_PWM, 
            DDK_CLOCK_GATE_MODE_ENABLED_ALL);
    }
    else
    {
        rc = DDKClockSetGatingMode(DDK_CLOCK_GATE_INDEX_PWM, 
            DDK_CLOCK_GATE_MODE_DISABLED);
    }
    return rc;

}

//------------------------------------------------------------------------------
//
// Function: BSPPwmGetClockGatingMode
//
// This function reads the value of CRM clock for PWM.
//
// Parameters:
//      None
//
// Returns:
//      Return TRUE if clock is not disabled, else return FALSE.
//
//------------------------------------------------------------------------------
BOOL BSPPwmGetClockGatingMode()
{
    DDK_CLOCK_GATE_MODE ClockState;
    DDKClockGetGatingMode(DDK_CLOCK_GATE_INDEX_PWM,	&ClockState);

    if (ClockState != DDK_CLOCK_GATE_MODE_DISABLED)
	{
		return TRUE;
	}
	else
	{
		return FALSE;
	}
}

//------------------------------------------------------------------------------
//
// Function: BSPPwmIomuxSetPin
//
// This function configures the IOMUX pin for PWM.
//
// Parameters:
//      None
//
// Returns:
//      None.
//
//------------------------------------------------------------------------------
void BSPPwmIomuxSetPin(void)
{
    DDKIomuxSetPinMux(DDK_IOMUX_PIN_PWMO,  DDK_IOMUX_OUT_FUNC, DDK_IOMUX_IN_FUNC);
}