i2c.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: I2C.C

    Purpose: Implementation of I2C module.

    Version: 0.02                                   11:15AM  2005/12/09

    Compiler: Keil 8051 C Compiler v8.01

    Reference:
    [1] I2C Peripherals data handbook IC12, 1996 Philips Semiconductors
    [2] Display Driver and I2C-bus Peripherals data handbook IC12, 2000
        Philips Semiconductors

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

    R0.01 05:19PM  2004/10/25 Jeffrey Chang
    Reason:
        1. Original.
    Solution:

   ----------------------------------------------------------------------
    R0.02 11:14AM  2005/12/09 Jeffrey Chang
    Reason:
        1. Revised timing.
    Solution:

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

#define _I2C_C_


/* ------------------------------------
    Header Files
   ------------------------------------ */
#include <intrins.h>

#include "common.h"
#include "i2c.h"

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

#define NOP_24  { _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_();}
#define NOP_20  { _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); }
#define NOP_18  { _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); }
#define NOP_15  { _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_();  }
#define NOP_12  { _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_();   }
#define NOP_10  { _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_();                     }
#define NOP_3   { _nop_(); _nop_(); _nop_(); }
#define NOP_2   { _nop_(); _nop_(); }
#define NOP_1   { _nop_(); }
#define NOP_0   {  }

// 6 / 14.318MHz = 419 ns !

#if (I2C_MODE_CFG  == I2C_MODE_SLOW)
    // 100 kHz

    // [10]165 Standard Mode Start Set-up Time:             Tsu,sta = 4.7 us
    // [11]72  Standard Mode Start Set-up Time:             Tsu,sta = 4.7 us
    #define I2C_SU_STA      NOP_24

    // [10]165 Standard Mode Start Hold Time:               Thd,dat = 4.0 us
    // [11]72  Standard Mode Start Hold Time:               Thd,dat = 4.0 us
    #define I2C_HD_STA      NOP_20

    // [10]165 Standard Mode Data Set-Up Time:              Tsu,dat = 250 ns
    // [11]72  Standard Mode Data Set-Up Time:              Tsu,dat = 250 ns
    #define I2C_SU_DAT      NOP_2

    // [10]165 Standard Mode Data Hold Time:                Thd,dat = 0 us
    // [11]72  Standard Mode Data Hold Time:                Thd,dat = 0 us
    #define I2C_HD_DAT      NOP_0

    // [10]165 Standard Mode HIGH period of the SCL clock:  Thigh = 4.0 us
    // [11]72  Standard Mode HIGH period of the SCL clock:  Thigh = 4.0 us
    #define I2C_HIGH        NOP_20

    // [10]165 Standard Mode LOW period of the SCL clock:   Tlow = 4.7 us
    // [11]72  Standard Mode LOW period of the SCL clock:   Tlow = 4.7 us
    #define I2C_LOW         NOP_24

    // [10]165 Standard Mode Stop Set-up Time:              Tsu,sto = 4.0 us
    // [11]72  Standard Mode Stop Set-up Time:              Tsu,sto = 4.0 us
    #define I2C_SU_STO      NOP_20

#elif (I2C_MODE_CFG  == I2C_MODE_STANDARD)
    // 100 kHz

    // [10]165 Standard Mode Start Set-up Time:             Tsu,sta = 4.7 us
    // [11]72  Standard Mode Start Set-up Time:             Tsu,sta = 4.7 us
    #define I2C_SU_STA      NOP_12

    // [10]165 Standard Mode Start Hold Time:               Thd,dat = 4.0 us
    // [11]72  Standard Mode Start Hold Time:               Thd,dat = 4.0 us
    #define I2C_HD_STA      NOP_10

    // [10]165 Standard Mode Data Set-Up Time:              Tsu,dat = 250 ns
    // [11]72  Standard Mode Data Set-Up Time:              Tsu,dat = 250 ns
    #define I2C_SU_DAT      NOP_1

    // [10]165 Standard Mode Data Hold Time:                Thd,dat = 0 us
    // [11]72  Standard Mode Data Hold Time:                Thd,dat = 0 us
    #define I2C_HD_DAT      NOP_0

    // [10]165 Standard Mode HIGH period of the SCL clock:  Thigh = 4.0 us
    // [11]72  Standard Mode HIGH period of the SCL clock:  Thigh = 4.0 us
    #define I2C_HIGH        NOP_10

    // [10]165 Standard Mode LOW period of the SCL clock:   Tlow = 4.7 us
    // [11]72  Standard Mode LOW period of the SCL clock:   Tlow = 4.7 us
    #define I2C_LOW         NOP_12

    // [10]165 Standard Mode Stop Set-up Time:              Tsu,sto = 4.0 us
    // [11]72  Standard Mode Stop Set-up Time:              Tsu,sto = 4.0 us
    #define I2C_SU_STO      NOP_10


#elif (I2C_MODE_CFG  == I2C_MODE_FAST)
    // 400 kHz

    // [10]165 Fast Mode Start Set-up Time:                 Tsu,sta = 0.6 us
    #define I2C_SU_STA      NOP_2

    // [10]165 Fast Mode Start Hold Time:                   Thd,dat = 0.6 us
    #define I2C_HD_STA      NOP_2

    // [10]165 Fast Mode Data Set-Up Time:                  Tsu,dat = 100 ns
    #define I2C_SU_DAT      NOP_1

    // [10]165 Fast Mode Data Hold Time:                    Thd,dat = 0 us
    #define I2C_HD_DAT      NOP_0

    // [10]165 Fast Mode HIGH period of the SCL clock:      Thigh = 0.6 us
    #define I2C_HIGH        NOP_2

    // [10]165 Fast Mode LOW period of the SCL clock:       Tlow = 1.3 us
    #define I2C_LOW         NOP_3

    // [10]165 Fast Mode Stop Set-up Time:                  Tsu,sto = 0.6 us
    #define I2C_SU_STO      NOP_2

#elif (I2C_MODE_CFG  == I2C_MODE_HIGHSPEED)
    // 3.4 MHz

    // [10]165 Highspeed Mode Start Set-up Time:            Tsu,sta = 4.7 us
    #define I2C_SU_STA      NOP_0

    // [10]165 Highspeed Mode Start Hold Time:              Thd,dat = 4.0 us
    #define I2C_HD_STA      NOP_0

    // [10]165 Highspeed Mode Data Set-Up Time:             Tsu,dat = 250 ns
    #define I2C_SU_DAT      NOP_0

    // [10]165 Highspeed Mode Data Hold Time:               Thd,dat = 0 us
    #define I2C_HD_DAT      NOP_0

    // [10]165 Highspeed Mode HIGH period of the SCL clock: Thigh = 4.0 us
    #define I2C_HIGH        NOP_0

    // [10]165 Highspeed Mode LOW period of the SCL clock:  Tlow = 4.7 us
    #define I2C_LOW         NOP_0

    // [10]165 Highspeed Mode Stop Set-up Time:             Tsu,sto = 4.0 us
    #define I2C_SU_STO      NOP_0

#else
    #error I2C.C - Invalid I2C_MODE_CFG !
#endif // I2C_MODE_CFG


#define     I2C_GET_DAT_HIGH        (   I2C_ioSDA == HIGH   )

#define     I2C_SET_CLK(HiLo)       {   I2C_ioSCL = (HiLo) ? HIGH : LOW;    }
#define     I2C_SET_DAT(HiLo)       {   I2C_ioSDA = (HiLo) ? HIGH : LOW;    }


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


/* ------------------------------------
    Variables Definitions
   ------------------------------------ */
sbit I2C_ioSCL  = P1 ^ 6;
sbit I2C_ioSDA  = P1 ^ 7;


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



/* -------------------------------------------------------------------
    Name: I2C_GetACK -
    Purpose: .
    Passed: None.
    Returns: LOW if OK
    Notes:
  ------------------------------------------------------------------- */
BOOL I2C_GetACK (void)
{
    BOOL    fResult;


    //I2C_SET_DAT(HIGH);        // Removed by JC 01:48PM  2005/11/23
    I2C_SU_DAT;                 // Added by JC 01:51PM  2005/11/23

    I2C_SET_CLK(HIGH);
    I2C_HIGH;

    fResult = I2C_GET_DAT_HIGH;

    I2C_SET_CLK(LOW);
    I2C_LOW;

    return( fResult );
} /* I2C_GetACK */


/* -------------------------------------------------------------------
    Name: I2C_Init -
    Purpose: .
    Passed: None.
    Returns: None.
    Notes:
  ------------------------------------------------------------------- */
void I2C_Init (void)
{
    I2C_SET_DAT(HIGH);
    I2C_SET_CLK(HIGH);
} /* I2C_Init */


#if (I2C_RX_BURST)
/* -------------------------------------------------------------------
    Name: I2C_RxBurst -
    Purpose: To receive bulk data from I2C slave device.
    Passed:
        bIdx: 1..255. (Excludes slave address and sub-address)
    Returns: None.
    Notes:
        The bSLA should be the slave device's 'WRITE' module addres,
        not 'READ' one.
   ------------------------------------------------------------------- */
void I2C_RxBurst (
UB8  bSLA,          /* I2C slave address */
UB8  bREG,          /* I2C sub-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(bSLA);                 
    I2C_GetACK();                     

    I2C_TxData(bREG);                 
    I2C_GetACK();


    /* --------------------------------
        Read
       -------------------------------- */
    I2C_Start();                       
    I2C_TxData(bSLA | 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();
} /* I2C_RxBurst */
#endif


#if (I2C_RX_BYTE)
/* -------------------------------------------------------------------
    Name: I2C_RxByte -
    Purpose: To receive one byte data from I2C slave device.
    Passed:
        UB8 bSLA,          I2C slave address
        UB8 bREG           I2C sub-address

    Returns:
        One byte received data.
    Notes:
        The bSLA should be the slave device's 'WRITE' mode address,
        not 'READ' one.
   ------------------------------------------------------------------- */
UB8 I2C_RxByte (
UB8 bSLA,          /* I2C slave address */
UB8 bREG           /* I2C sub-address */
)
{
    UB8    bDATA;


    I2C_Start();

    /* --------------------------------
        Write
       -------------------------------- */
    I2C_TxData(bSLA);                   
    I2C_GetACK();                       

    I2C_TxData(bREG);
    I2C_GetACK();


    /* --------------------------------
        Read
       -------------------------------- */
    I2C_Start();
    I2C_TxData(bSLA | 0x01);