bspowire.c

IMX31开发板

//------------------------------------------------------------------------------
//
// Copyright (C) 2006, 2007 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:  bspowire.c
//
//  Provides BSP-specific configuration routines for the OWIRE peripheral.
//
//------------------------------------------------------------------------------
#include <windows.h>
#include "owire_priv.h"
#include "bsp.h"

//------------------------------------------------------------------------------
// External Functions


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


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


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


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


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


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

//------------------------------------------------------------------------------
//
// Function: BSPGetDivider
//
// Determine the appropriate time divider value for the one-wire module.
// The divider value is chosen based on the clock so as to arrive at
// a divided clock closest to 1MHz.
//
// Parameters:
//      None.
//
// Returns:
//      The value to go into the OWIRE time divider register.
//
//------------------------------------------------------------------------------
UINT16 BSPGetDivider()
{
    UINT16 div, rem;
    UINT32 freq;

    DDKClockGetFreq(DDK_CLOCK_SIGNAL_PER, &freq);
    div = freq / 1000000;
	rem = (UINT16)(freq % 1000000);

    if (rem >= 500000)
        div++;

    return div;
}

//------------------------------------------------------------------------------
//
// Function: BSPOwireCrmSetClockGatingMode
//
// This function calls to the CRM module to
// set the clock gating mode, turning on or off
// clocks to the OWIRE.
//
// Parameters:
//      startClocks
//          [in] If TRUE, turn clocks to OWIRE on.
//                If FALSE, turn clocks to OWIRE off
//
// Returns:
//      TRUE if success.
//      FALSE if failure.
//
//------------------------------------------------------------------------------
BOOL BSPOwireSetClockGatingMode(BOOL startClocks)
{
    if (startClocks)
    {
        // Turn OWIRE clocks on
        if (!DDKClockSetGatingMode(DDK_CLOCK_GATE_INDEX_OWIRE, 
            DDK_CLOCK_GATE_MODE_ENABLED_ALL))
        {
            DEBUGMSG(ZONE_ERROR, (TEXT("%s: Failed to set CRM clock gating mode!\r\n"), __WFUNCTION__));
            return FALSE;
        }
    }
    else
    {
        // Turn OWIRE clocks off
        if (!DDKClockSetGatingMode(DDK_CLOCK_GATE_INDEX_OWIRE, 
            DDK_CLOCK_GATE_MODE_DISABLED))
        {
            DEBUGMSG(ZONE_ERROR, (TEXT("%s: Failed to set CRM clock gating mode!\r\n"), __WFUNCTION__));
            return FALSE;
        }
    }

    return TRUE;
}

void BSPOwireIomuxSetPin(void)
{
     DDKIomuxSetPinMux(DDK_IOMUX_PIN_BATT_LINE,  DDK_IOMUX_OUT_FUNC, DDK_IOMUX_IN_FUNC);
}