/*
****************************************************************************************
*?????Coder?:?????????Ashang
*?????MCU?:???????????STC89C51
*?????OSC?:???????????12MHz||exterior
*?????Compiler?:??????KEIL
*?????File?Name:??????AD7745.c
*?????VER:						1.0
*?????Function:									
****************************************************************************************
*/
#include?
#include?“Public.h“

volatile?BYTE?I2C_Flag=0;

DWORDUnion?TempResult;
DWORDUnion?CapResult;

#define?ERR?0
#define?NOACK?1



//AD7745Delay5?:?Short?delay?（5?machine?cycles?incl?CALL?time）?for?the?main?signals（SCLOCK??SDATA）
void?AD7745Delay5（void）		
{
	BYTE?i;
	for（?i=0;?i<200?;?i++?）;
}

//AD7745I2CStart?:?Sends?the?start?bit?to?initiate?an?I2C?communication
void?AD7745I2CStart（void）	
{
	I2C_Flag?=?0;
	I2CDat?=?1;
	I2CSCL?=?1;
	I2CDat?=?0;			//low?O/P?on?SDATA?
	AD7745Delay5（）;			//delay?5?Machine?cycles
	I2CSCL?=?0;			//start?bit
}

//AD7745I2CStop?:?Sends?the?stop?bit?to?end?an?I2C?transmission
void?AD7745I2CStop（void）	
{
	I2CDat?=?0;			//get?SDATA?ready?for?stop
	I2CSCL?=?1;			//set?clock?for?stop
	AD7745Delay5（）;
	I2CDat?=?1;			//this?is?the?stop?bit
}

//AD7745I2CSendByte?:?Send?8-bits?in?ch?to?the?slave
void?AD7745I2CSendByte（BYTE?ch）
{
	BYTE?i;
	I2CSCL?=?0;			//make?sure?that?the?clock?line?is?low
	for（i=0;i<8;i++）
	{
		I2CDat?=?0;		//put?data?bit?on?SDATA?line
		if（ch&0x80）
			I2CDat?=?1;
		I2CSCL?=?1;		//clock?to?send?bit
		I2CSCL?=?0;		//clear?clock?
		ch?=?ch<<1;		//move?ch‘s?bit
	}
	I2CSCL?=?1;			//send?clock?for?acknowledge
	AD7745Delay5（）;
	if（I2CDat）				//no?acknowledge?set?flag
		I2C_Flag?|=?1<	I2CSCL?=?0;			//clear?clock?
}

//AD7745I2CReceiveByte?:?receives?one?byte?of?data?from?an?I2C?slave?device.
//ak?refers?to?ackonwledge?bit
BYTE?AD7745I2CReceiveByte（BYTE?ak）	
{
	BYTE?irr=0;
	I2CSCL?=?0;			//make?sure?the?clock?line?is?low
	for（i=0;i<8;i++）
	{
		I2CSCL?=?1;		//clock?to?recieve?bit
		rr?=?rr<<1;		//read?data?bit
		rr?|=?I2CDat;
		I2CSCL?=?0;		//clear?clock
	}
	I2CDat?=?ak;			//Send?（no）?acknowledge?bit
	I2CSCL?=?1;
	AD7745Delay5（）;
	I2CSCL?=?0;			//clear?clock
	return?rr;
}

//AD7745Reset?:?Reset?the?CDC?after?send?SLAVEADD?send?AD7745Reset_B（0xBF）
void?AD7745Reset（）	
{
	BYTE?i;
	AD7745I2CStart（）;
	AD7745I2CSendByte（SLAVEADD）;
	if（!（I2C_Flag&（1<		AD7745I2CSendByte（AD7745Reset_ADDR）;
	else
		I2C_Flag?|=?1<	AD7745I2CStop（）;
	
	for（i=0;i<254;i++）;	//wait?for?CDC?reset
}

//AD7745WriteRegistor?:?write?reg?to?CDC‘s?addr?register
void?AD7745WriteRegistor（BYTE?addr?BYTE?reg）	
{
	AD7745I2CStart（）;
	AD7745I2CSendByte（SLAVEADD）;
	if（!（I2C_Flag&（1<		AD7745I2CSendByte（addr）;
	if（!（I2C_Flag&（1<		AD7745I2CSendByte（reg）;
	AD7745I2CStop（）;
	if（I2C_Flag&（1<		I2C_Flag?|=?1<}
#if?0
//AD7745ReadRegistor?:?read?CDC‘s?addr?register
BYTE?AD7745ReadRegistor（BYTE?add

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????5345??2011-07-05?21:04??AD7745.c

?????文件???????1284??2011-07-05?21:06??AD7745.h

-----------?---------??----------?-----??----

?????????????????6629????????????????????2