eeprom.c

Bitek 公司 bit1611b模拟屏驱动芯片外接MCU驱动DEMO源码

/* **********************************************************************

         Copyright (c) 2002-2006 Beyond Innovation Technology Co., Ltd

        All rights are reserved. Reproduction in whole or in parts is
    prohibited without the prior written consent of the copyright owner.
   ----------------------------------------------------------------------

    Module: EEPROM.C

    Purpose: Implementation of EEPROM module.

    Version: 0.01                                   07:24PM  2005/05/13

    Compiler: Keil 8051 C Compiler v8.01

    Reference:
    [1] AN709 System Level Design Considerations When Using I2C Serial EEPROM
        Devices, 1999 Microchip Technology Inc.

   ----------------------------------------------------------------------
    Modification:

    R0.01 07:24PM  2005/05/13 Jeffrey Chang
    Reason:
        1. Original.
    Solution:
 
   ********************************************************************** */

#define _EEPROM_C_

/* ------------------------------------
    Header Files
   ------------------------------------ */

#include "eeprom.h"
#include "i2c.h"
#include "platform.h"
#include "timer.h"


/* ------------------------------------
    Macro Definitions
   ------------------------------------ */


/* ------------------------------------
    Type Definitions
   ------------------------------------ */


/* ------------------------------------
    Variables Definitions
   ------------------------------------ */

/* ------------------------------------
    Function Prototypes
   ------------------------------------ */


/* -------------------------------------------------------------------
    Name: EEPROM_Default -
    Purpose:
        This function writes default values of data structures to 
        specific address of EEPROM block.
    Passed: None.
    Returns: None.
    Notes:
   ------------------------------------------------------------------- */
void EEPROM_Default (void)
{
    EEPROM_TxBurst(EGD_ADDR,
                   sizeof(tsEGD_Default),
                   (UB8 *)&tsEGD_Default);

    EEPROM_TxBurst(EYD_ADDR,
                   sizeof(tsEYD_Default),
                   (UB8 *)&tsEYD_Default);
} /* EEPROM_Default */


/* -------------------------------------------------------------------
    Name: EEPROM_Init -
    Purpose: To initialize the EEPROM module.
    Passed: None.
    Returns: None.
    Notes:
   ------------------------------------------------------------------- */
void EEPROM_Init (void)
{
    // ++++++++++++++++++++++++++++++++
    // [JC011] Added by JC 03:15PM  2006/04/26
    // [1]2 Forcing EEPROM internal reset via software
    I2C_Start();

    I2C_TxData(0xFF);
    I2C_SetNAK();

    I2C_Start();
    I2C_Stop();
    // ++++++++++++++++++++++++++++++++
} /* EEPROM_Init */


#if (EEPROM_RX_BURST)
/* -------------------------------------------------------------------
    Name: EEPROM_RxBurst -
    Purpose: To receive bulk data from I2C EEPROM.
    Passed:
        UW16 wAddr  = EEPROM address.
        UB8  bCnt   = The number of data which will be received
                    excluding EEPROM address (bCnt: 1..255).
        UB8  *pbData    = The pointer which points to the first data item.
    Returns: None.
    Notes:
        The EEPROM_MAD should be the slave device's 'WRITE' module addres,
        not 'READ' one.
   ------------------------------------------------------------------- */
void EEPROM_RxBurst (
UW16 wAddr,         /* EEPROM address */
UB8  bCnt,          /* The number of data which will be transmitted */
UB8  *pbData        /* Point to the first DATA item */
)
{
    UB8     bIdx;



    I2C_Start();

    /* --------------------------------
        Write
       -------------------------------- */
    I2C_TxData(EEPROM_MAD | ((wAddr >> 8) << 1));
    I2C_GetACK();

    I2C_TxData(wAddr & 0x00FF);
    I2C_GetACK();

    /* --------------------------------
        Read
       -------------------------------- */
    I2C_Start();
    I2C_TxData(EEPROM_MAD | ((wAddr >> 8) << 1) | 0x01);
    I2C_GetACK();


    for (bIdx = 0; bIdx < (bCnt - 1); bIdx++)
    {
        *pbData++ = I2C_RxData();

        I2C_SetACK();
    } /* for */


    /* --------------------------------
        Last Read
       -------------------------------- */
    *pbData = I2C_RxData();
    I2C_SetNAK();

    I2C_Stop();

} /* EEPROM_RxBurst */
#endif


#if (EEPROM_RX_BYTE)
/* -------------------------------------------------------------------
    Name: EEPROM_RxByte -
    Purpose:
        To receive one byte data from I2C slave device.

    Passed:
        wAddr = EEPROM address.

    Returns:
        The one byte data.

    Notes:
        The bSLA should be the slave device's 'WRITE' module addres,
        not 'READ' one.
   ------------------------------------------------------------------- */
UB8 EEPROM_RxByte (UW16 wAddr)
{
    UB8 bData;


    I2C_Start();

    /* --------------------------------
        Write
       -------------------------------- */
    /* 'WRITE' MAD and High byte of address */
    I2C_TxData(EEPROM_MAD | ((wAddr >> 8) << 1));
    I2C_GetACK();

    /* Low byte of address */
    I2C_TxData(wAddr & 0x00FF);
    I2C_GetACK();

    /* --------------------------------
        Read
       -------------------------------- */
    I2C_Start();
    I2C_TxData(EEPROM_MAD | ((wAddr >> 8) << 1) | 0x01);
    I2C_GetACK();

    /* --------------------------------
        Last Read
       -------------------------------- */
    bData = I2C_RxData();
    I2C_SetNAK();

    I2C_Stop();

    return( bData );

} /* EEPROM_RxByte */
#endif


#if (EEPROM_TX_BURST)
/* -------------------------------------------------------------------
    Name: EEPROM_TxBurst -
    Purpose:
        To transmit bulk data to I2C EEPROM.

    Passed:
        UW16 wAddr  = EEPROM address.
        UB8  bCnt   = The number of data which will be transmitted
                    excluding EEPROM address (bCnt: 1..255).
        UB8  *pbData    = The pointer which points to the first data item.

    Returns: None.
    Notes:
   ------------------------------------------------------------------- */
void EEPROM_TxBurst (
UW16 wAddr,         /* EEPROM address */
UB8  bCnt,          /* The number of data which will be transmitted */
UB8  *pbData        /* Point to the first DATA item */
)
{
    for (   ; bCnt; bCnt--)
    {
        I2C_TxByte(EEPROM_MAD | ((wAddr >> 8) << 1), wAddr++, *pbData++);

        TIMER_DelayMS(EEPROM_WRITE_CYCLE_TIME);
    } // for
} /* EEPROM_TxBurst */
#endif


#if (EEPROM_TX_BYTE)
/* -------------------------------------------------------------------
    Name: EEPROM_TxByte -
    Purpose:
        To transmit one byte data to I2C slave device.

    Passed:
    Returns: None.
    Notes:
        The bSLA should be the slave device's 'WRITE' module addres,
        not 'READ' one.
   ------------------------------------------------------------------- */
void EEPROM_TxByte (
UW16    wAddr,         /* I2C sub-address */
UB8     bData          /* Data item */
)
{
    I2C_Start();

    I2C_TxData(EEPROM_MAD | ((wAddr >> 8) << 1));
    I2C_GetACK();

    I2C_TxData(wAddr & 0x00FF);
    I2C_GetACK();

    I2C_TxData(bData);
    I2C_GetACK();

    I2C_Stop();

    TIMER_DelayMS(EEPROM_WRITE_CYCLE_TIME);
} /* EEPROM_TxByte */
#endif



/* -------------------------------------------------------------------
    Name:  -
    Purpose: .
    Passed: None.
    Returns: None.
    Notes:
   ------------------------------------------------------------------- */


/* **********************************************************************

    Description:


   ********************************************************************** */

/* %% End Of File %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% */