davincievm_eeprom.c

开发环境CCS3.2,为TI最新处理器TMS320DM6446的网卡驱动程序源码

/*
 *  Copyright 2005 by Spectrum Digital Incorporated.
 *  All rights reserved. Property of Spectrum Digital Incorporated.
 *
 *  Not for distribution.
 */

/*
 *  EEPROM implementation
 *
 */

#include "davincievm_eeprom.h"

/* ------------------------------------------------------------------------ *
 *                                                                          *
 *  DAVINCIEVM_EEPROM_init( )                                               *
 *                                                                          *
 *      Initialize the I2C EEPROM                                           *
 *                                                                          *
 * ------------------------------------------------------------------------ */
Int16 DAVINCIEVM_EEPROM_init( )
{
    return 0;
}

/* ------------------------------------------------------------------------ *
 *                                                                          *
 *  DAVINCIEVM_EEPROM_read( src, dst, length )                              *
 *                                                                          *
 *      Read from the I2C EEPROM                                            *
 *                                                                          *
 * ------------------------------------------------------------------------ */
Int16 DAVINCIEVM_EEPROM_read( Uint32 src, Uint32 dst, Uint32 length )
{
    Int16 retcode = 0;
    Uint8 addr[2];

    addr[0] = src >> 8;         // HIGH address
    addr[1] = src & 0xFF;       // LOW address

    /* Send 16-bit address */
    retcode |= DAVINCIEVM_I2C_write( EEPROM_I2C_ADDR, addr, 2 );

    /* Wait for EEPROM to process */
    DAVINCIEVM_waitusec( 1000 );

    /* Read data */
    retcode |= DAVINCIEVM_I2C_read ( EEPROM_I2C_ADDR, ( Uint8* )dst, length );

    return retcode;
}

/* ------------------------------------------------------------------------ *
 *                                                                          *
 *  DAVINCIEVM_EEPROM_write( src, dst, length )                             *
 *                                                                          *
 *      Write to the I2C EEPROM                                             *
 *                                                                          *
 * ------------------------------------------------------------------------ */
Int16 DAVINCIEVM_EEPROM_write( Uint32 src, Uint32 dst, Uint32 length )
{
    Int16 retcode = 0;
    Uint16 i;
    Uint8 buffer[64 + 2];
    Uint8* psrc8 = ( Uint8* )src;
    Uint8* pdst8 = &buffer[2];

    buffer[0] = dst >> 8;       // HIGH address
    buffer[1] = dst & 0xFF;     // LOW address

    /* Fill in data */
    for ( i = 0 ; i < length ; i++ )
        *pdst8++ = *psrc8++;

    /* Send 16-bit address and data */
    retcode |= DAVINCIEVM_I2C_write( EEPROM_I2C_ADDR, buffer, 2 + length );

    return retcode;
}