i2c.c

Windows CE 6.0 BSP for the Beagle Board.

//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
//
// Use of this sample source code is subject to the terms of the Microsoft
// license agreement under which you licensed this sample source code. If
// you did not accept the terms of the license agreement, you are not
// authorized to use this sample source code. For the terms of the license,
// please see the license agreement between you and Microsoft or, if applicable,
// see the LICENSE.RTF on your install media or the root of your tools installation.
// THE SAMPLE SOURCE CODE IS PROVIDED "AS IS", WITH NO WARRANTIES.
//
//------------------------------------------------------------------------------
//
//  File:  i2c.c
//
#include <windows.h>
#include <oal.h>
#include <omap2420.h>
#include <ceddkex.h>
#include "kerneli2c.h"

//------------------------------------------------------------------------------

#define I2C_TRANS_ADDRESS           0x2C

//------------------------------------------------------------------------------

BOOL WriteUcharI2C(UCHAR reg, UCHAR data)
{
    I2CTRANS trans;

    ZeroMemory(&trans,sizeof(trans));

    trans.mClk_HL_Divisor = I2C_CLOCK_100Khz;

    trans.mOpCode[0] = I2C_OPCODE_WRITE;
    trans.mTransLen[0] = 2;
    trans.mBufferOffset[0] = 0;
    trans.mBuffer[0] = reg;
    trans.mBuffer[1] = data;

    KERNELI2C_PreemptibleSubmit(I2C_TRANS_ADDRESS, 7, &trans);

    if (trans.mErrorCode)
        return FALSE;

    return TRUE;
}

//------------------------------------------------------------------------------

BOOL ReadUshortI2C( UCHAR reg, USHORT *pData )
{
    I2CTRANS trans;
    
    ZeroMemory(&trans,sizeof(trans));

    trans.mClk_HL_Divisor = I2C_CLOCK_100Khz;

    /* write the register offset to read from */
    trans.mOpCode[0] = I2C_OPCODE_WRITE;
    trans.mTransLen[0] = 1;
    trans.mBufferOffset[0] = 0;
    trans.mBuffer[0] = reg;
    /* read the 2 bytes from that location */
    trans.mOpCode[1] = I2C_OPCODE_READ;
    trans.mTransLen[1] = 2;
    trans.mBufferOffset[1] = 0;

    KERNELI2C_PreemptibleSubmit(I2C_TRANS_ADDRESS, 7, &trans);

    if (trans.mErrorCode)
        return FALSE;

    *pData = *(USHORT *)trans.mBuffer;

    return TRUE;
}

//------------------------------------------------------------------------------

BOOL InitI2cController()
{
    return TRUE;
}

//------------------------------------------------------------------------------