//THIS?CODE?WAS?DESIGNED?TO?DEMONSTRATE?HOW?THE?FM24C04/FM24C04A?SERIAL?FRAM?COULD?
//BE?INTERFACED?TO?THE?8051?MICROCONTROLLER.?THE?INTERFACE?USES?2?LINES?
//FROM?PORT?2?（P2.7?AND?P2.6）?TO?COMMUNICATE.?
//THE?CODE?SHOWN?DEMONSTRATES?A?‘RANDOM?READ‘?AND?‘BYTE?WRITE‘.?THE?OTHER?*
//MODES?OF?OPERATION?CAN?BE?CREATED?BY?EXPANDING?UPON?THESE?ROUTINES.
//深圳市華胄科技有限公司
//the?first?date?writed:2003-06-28
//email:ms@huazhoucn.com
//=============================
#include
#include
#define?uchar?unsigned?char
#define?uint?unsigned?int
#define?IIC_READ?0XA1????//定義讀指令
#define?IIC_WRITE?0XA0???//定義寫指令
#define?NOP?_nop_（）
//==============================
uchar?idata?buff[32];	//save?the?byte?read?out??form?iic?device?in?test?operation
uchar?idata?readbuff[32];//測試數(shù)組，暫存寫入讀出數(shù)據(jù)
//uchar?writebuff[32];
//===============================
sbit?SDA=P1^4;//P1^1;//P1^2;//P1^1;//P1^2;//P2^7;	//THE?SDA?BIT?IS?PORT?2?BIT?7
sbit?SCL=P1^7;//P1^0;//P3^5;//P1^3;//P2^6;	//THE?SCL?BIT?IS?PORT?2?BIT?6
//sbit?SDA=P2^7;	//THE?SDA?BIT?IS?PORT?2?BIT?7
//sbit?SCL=P2^6;	//THE?SCL?BIT?IS?PORT?2?BIT?6
sbit?WP=P2^5;
sbit?test=P1^0;
//===============================
//define?a?bit_operation?byte?to?use?in?shift?operation
//use?this?mode?can?achieve?high?operation?speed?
uchar?bdata?bbyte;//定義位操作用數(shù)組，采用此方法可提高位操作速度
sbit?a0=bbyte^0;
sbit?a1=bbyte^1;
sbit?a2=bbyte^2;
sbit?a3=bbyte^3;
sbit?a4=bbyte^4;
sbit?a5=bbyte^5;
sbit?a6=bbyte^6;
sbit?a7=bbyte^7;
//========================================
bit?IFACK;	//record?the?SDA?state?to?confirn?if?ACK?has?happened?
bit?NO_ACK;	//no?ack?flag
bit?BUS_FAULT;	//bus?fault?flag
//========================================
//FUNCTION:ROUTES?TO?PROVIDE?A?START?SIGNAL
void?start（void）
{
	SCL=0;SDA=1;SCL=1;SDA=0;SCL=0;
}
//=======================================
//FUNCTION:ROUTES?TO?PROVIDE?A?STOP?SIGNAL
void?stop（void）
{
	SCL=0;SDA=0;SCL=1;SDA=1;SCL=0;
}
//=====================================
//FUNCTION:ROUTES?TO?PROVIDE?ACK?SINGAL
void?ack（void）
{
	SCL=0;SDA=0;SCL=1;SCL=0;
}
//=====================================
//FUNCTION:ROUTES?TO?RELEASE?THE?SDA?TO?RECEIVE?A?ACK?SIGNAL?
//	?????????????OR?TO?PROVIDE?A?NO_ACK?SIGNAL
//type=1等待應(yīng)答信號
//type=0?產(chǎn)生無應(yīng)答信號
void?nack（uchar?type）
{
	SCL=0;SDA=1;SCL=1;IFACK=SDA;?SCL=0;
	if（type）
	{
		if（IFACK）//如果無應(yīng)答信號，則置標志位NO_ACK程序中止
		{	
			NO_ACK=1;//用戶可以加入自己的異常處理程序
			//while（1）;
		}
		else?NO_ACK=0;
	}
}
//=======================================================
//FUNCTION:THE?IIC?DEVICE?SHIFT?OUT?A?BYTE??TO?THE?MASTER
uchar??inbyte（void）?{//從IIC器件中讀出數(shù)據(jù)
	SDA=1;
	SCL=1;a7=SDA;SCL=0;
	SCL=1;a6=SDA;SCL=0;
	SCL=1;a5=SDA;SCL=0;
	SCL=1;a4=SDA;SCL=0;
	SCL=1;a3=SDA;SCL=0;
	SCL=1;a2=SDA;SCL=0;
	SCL=1;a1=SDA;SCL=0;
	SCL=1;a0=SDA;SCL=0;
	return（bbyte）;
}
//=======================================================
//FUNCTION:THE?IIC?DEVICE?SHIFT?IN?A?BYTE?FROM?THE?MASTER?
void?outbyte（uchar?outdata）?{//將數(shù)據(jù)寫放IIC器件
	bbyte=outdata;
	SD

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

?????文件???????5573??2008-08-13?14:08??FM24c04的控制軟件（8052）C.c

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

?????????????????5573????????????????????1