i2c_drv.c

PLL的资料文档,包括资料

/*C**************************************************************************
* NAME:         I2C_drv.c
*----------------------------------------------------------------------------
* Copyright (c) 2006 Atmel.
*----------------------------------------------------------------------------
* RELEASE:      C51 Sample      
* REVISION:     1.00     
*----------------------------------------------------------------------------
*
*****************************************************************************/
#include "system\reg51.h"
#include "system\compiler.h"
#include "system\config.h"
#include "Driver\io_def.h"
#include "Driver\i2c_drv.h"

/*F**************************************************************************
* NAME: I2c_ReadByte
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE: 从24c02的地址address中读取一个字节数据
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
Byte I2c_ReadByte (Byte address)
{
	Byte bTemp = 0x00;

	I2c_start();
	I2c_getLSB(I2C_ID0);
	I2c_getLSB(address);
	I2c_start();
	I2c_getLSB(I2C_ID1);
	bTemp = I2c_scanLSB();
	I2c_ack();
	I2c_stop();
	return(bTemp);
}

/*F**************************************************************************
* NAME: I2c_WriteByte
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE: 向24c02的address地址中写入一字节数据info
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
void I2c_WriteByte (Byte address, Byte bByte)
{
	 I2c_start();
	 I2c_getLSB(address);
	 I2c_getLSB(bByte);
	 I2c_stop();
}

/*F**************************************************************************
* NAME: I2c_scanLSB
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE: 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
Byte I2c_scanLSB (void)
{
	Byte i;
	char bByte = 0x00,temp;

	for (i=0; i<8; i++){
		ISCL = High;
		I2c_wait();
       	if (DTS_DIN){
			temp = 0x01;
   			temp <<= i;
       		bByte |= temp;
			}
		ISCL = Low;
		I2c_wait();
		}
	return (bByte);

}

/*F**************************************************************************
* NAME: I2c_getLSB
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE: 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
void I2c_getLSB (Byte bByte)
{
	Byte i;

	for (i=0; i<8; i++) 
	{
        if (bByte & 0x80) ISDA = High;
        else ISDA = Low;
        bByte <<= 1;
		I2c_wait();
      	ISCL = High;
		I2c_wait();
		ISCL = Low;
		I2c_wait();
	}
	ISDA = High;
	I2c_wait();
	ISCL = High;
	I2c_wait();
	I2c_wait();
	ISCL = Low;
	I2c_wait();
}

/*F**************************************************************************
* NAME: I2c_start
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE: 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
void I2c_start (void)
{
	ISDA = High;
	ISCL = High;
	I2c_wait();
	ISDA = Low;
	I2c_wait();
	ISCL = Low;
}

/*F**************************************************************************
* NAME: I2c_stop
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE: 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
void I2c_stop (void)
{
	ISDA = Low;
	I2c_wait();
	ISCL = High;
	I2c_wait();
	ISDA = High;
	I2c_wait();
}

/*F**************************************************************************
* NAME: I2c_ack
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE: 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
void I2c_ack (void)
{
	ISDA = Low;
	I2c_wait();
	ISDA = High;
	I2c_wait();
}

/*F**************************************************************************
* NAME: I2c_init
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE: 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
void I2c_init (void)
{
	ISDA = High;
	I2c_wait();
	ISCL = High;
	I2c_wait();
}

/*F**************************************************************************
* NAME: I2c_wait
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE: 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
void I2c_wait (void)
{
	char i;
	for(i=0; i<2; i++){
		i = i;
		}
}