;=================================================
; 24C02存儲(chǔ)器I2C總線實(shí)驗(yàn)      
;=================================================
;
;	zsMCU51實(shí)驗(yàn)板配套學(xué)習(xí)例程
;
;	中山單片機(jī)學(xué)習(xí)網(wǎng)	智佳科技
;
;	作者：逸風(fēng)	QQ:105558851
;
;	http://www.zsmcu.com
;	E-mail:info@zsmcu.com
;=================================================
SDA	EQU	P2.0
SCL	EQU	P2.1
Address	EQU	08H
I2CData	EQU	09H	

ORG 0000H 
LJMP START;轉(zhuǎn)入主程序
ORG 0010H ;外部中斷P3.2腳INT0入口地址
START:
	MOV	SP,#60H

	MOV	Address,#00H
	MOV	I2CData,#55H
	CALL	I2C_WRITE	;寫入數(shù)據(jù)

	MOV	I2CDATA,#0AAH   ;


	MOV	Address,#00H
	CALL	I2C_READ
	MOV	I2CData,A	;讀出數(shù)據(jù)
	NOP
	NOP

MAIN:




/*------------------------------------------------------
寫一個(gè)字節(jié)	Address地址	I2CDatata寫入的數(shù)據(jù)
------------------------------------------------------*/
I2C_WRITE:
    I2C_WRITE_A:
	LCALL	I2C_START
	MOV	A,#10100000B
	LCALL	I2C_SEND8BIT
	LCALL	I2C_ACK
	JC	I2C_WRITE_A	;=1，表示無(wú)確認(rèn)，再次發(fā)送
	
	MOV	A,Address
	LCALL	I2C_SEND8BIT
	LCALL	I2C_ACK	

	MOV	A,I2CData
	LCALL	I2C_SEND8BIT
	LCALL	I2C_ACK	
	LCALL	I2C_STOP
RET	



/*------------------------------------------------------
讀一個(gè)字節(jié)	Address地址	Data讀出的數(shù)據(jù)
------------------------------------------------------*/

I2C_READ:
    I2C_READ_A:
	LCALL	I2C_START
	MOV	A,#10100000B
	LCALL	I2C_SEND8BIT
	LCALL	I2C_ACK
	JC	I2C_READ_A	;=1，表示無(wú)確認(rèn)，再次發(fā)送

	MOV	A,Address
	LCALL	I2C_SEND8BIT
	LCALL	I2C_ACK	

    I2C_READ_B:
	LCALL	I2C_START
	MOV	A,#10100001B
	LCALL	I2C_SEND8BIT
	LCALL	I2C_ACK
	JC	I2C_READ_B

	LCALL	I2C_RECEIVE8BIT
	MOV	I2CData,A
	LCALL	I2C_ACK
	LCALL	I2C_STOP
RET



;發(fā)送開(kāi)始信號(hào)
I2C_START:
	SETB	SCL
	SETB	SDA
	NOP
	NOP
	CLR	SDA
	NOP
	NOP
	CLR	SCL
RET
;發(fā)送結(jié)束信號(hào)
I2C_STOP:
	CLR	SDA
	NOP
	NOP
	SETB	SCL
	NOP
	NOP
	SETB	SDA
RET

;發(fā)送接收確認(rèn)信號(hào)
I2C_ACk:
	SETB	SDA
	SETB	SCL
	NOP
	NOP
	JB	SDA,I2C_ACK0
	CLR	C	
	SJMP	I2C_ACK_END
    I2C_ACK0:
	SETB	C
    I2C_ACK_END:
	CLR	SCL
RET

;送八位數(shù)據(jù)
I2C_SEND8BIT:
	MOV	B,#08H
I2C_SEND8BIT_A:	
	RLC	A
	
	MOV	SDA,C
	SETB	SCL
	NOP
	NOP
	CLR	SCL
	DJNZ	B,I2C_SEND8BIT_A
RET


;接收八位數(shù)據(jù)
I2C_RECEIVE8BIT:
	MOV	B,#08H
	CLR	A
	SETB	SDA
I2C_RECEIVE8IT_A:
	SETB	SCL
	NOP
	NOP
	MOV	C,SDA
	RLC	A
	CLR	SCL
	DJNZ	B,I2C_RECEIVE8IT_A

RET