应广单片机读写24C02程序代码Word格式文档下载.docx

应广单片机读写24C02程序代码Word格式文档下载.docx

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I2C_SCLequpb.0

I2C_SDA_DIRequpbc.2

I2C_SCL_DIRequpbc.0

I2C_L0NG_DLYequ50

I2C_SH0RT_DLYequ20

I2C_SDA_HIGHequsetlI2C.SDAI2C_SDA_L0WequsetOI2C.SDA

I2C_SCL_HIGHequsetlI2C.SCLI2C_SCL_L0WequsetOI2C.SCL

I2CSDAOUTPUTequsetlI2CSDADIRI2CSDAINPUTequsetOI2CSDADIR

I2CSCLOUTPUTequsetlI2CSCLDIRI2CSCLINPUTequsetOI2CSCLDIR//?

aA?

uchari2c_rw_addr;

//?

AD?

M0O?

uchari2c_rw_byte;

fiy?

Yuchari2c_rw_cmd;

MAJ£

t）M0O?

uchari2c_rw_temp;

y?

10D?

a?

uchari2c_rw_cnt;

tOD?

//

////?

u£

uSTARTDA°

A

i2c_start:

I2CSDAOUTPUT

I2C_SCL_0UTPUT

I2C_SDA_HIGH

delayI2C_L0NG_DLY

I2C_SCL_HIGH

I2C_SDA_L0W

I2C_SCL_L0W

delayI2C_L0NG_DLYret

//

ufiiiSTOPDA0A

i2c_stop：

1?

QSALVEACKDAoA//

i2c_slave_ack：

//don'

tcheckACK

I2C_SDA_INPUT

delayI2C_SH0RT_DLY

I2C_SCL_LOW

I2C_SDA_0UTPUT

ret

//餡?

6MASTERACKDA°

A//

i2c_master_ack：

//骼?

6MASTERNACKDAoA//

i2c_master_nack:

delayI2C_SH0RT_DLYret

//D?

oXO?

//Input:

i2c_rw_temp

//Used:

i2c__rw_cnt

i2c_write_8bit：

i2crwent=8;

i2c_write_8bit_loop:

sici2c_rw_temp

swapcI2C_SDA

delayI2C_SHORT_DLY

I2CSCLLOW

dzsni2c_rw_cnt

gotoi2c_write_8bit_loop

A0?

dxo?

//Output:

i2c_rw_temp//

i2c_read_8bit：

i2c_rw_temp=0;

i2c_read_8bit_loop:

gotoi2c_read_8bit_loop

i2c_rw_addr//i2c_rw_cmd

//i2c_rw_temp//Output:

i2c_rw_byte

i2c_read_byte：

//start

calli2c_start

//writedeviceaddress（write）i2c_rw_temp=i2c_rw_cmd;

calli2c_write_8bit

//slaveack

cal1i2c_slave_ack

//writeregisteraddressi2c_rw_temp=i2c_rw_addr;

calli2c_write_8bit

//startrepeat

//writedeviceaddress（read）i2c_rw_temp=i2c_rw_cmd;

i2c_rw_temp・0二1;

delayI2C_SHORT_DLY//OaAi?

10fia（；

6?

dI2C_SDA?

6Axa?

fia?

d

//readdata

calli2c_read_8bit

i2c_rw_byte=i2c_rw_temp;

//storedata

//masternack

calli2c_master_nack

//stop

calli2c_stop

//retune

delayI2C_LONG_DLY

wdreset

i2c_rw_addr//i2c_rw_byte//i2c_rw_cmd//Used:

i2c_rw_cnt

//i2c_rw_temp//

i2c_write_byte:

//writedeviceaddressi2c_rw_temp=i2c_rw_cmd;

calli2c_slave_ack

//writedata

i2c_rw_temp=i2c_rw_byte;

EEPRONLRW.CN©

equOxAO

////°

CyAu:

eeprom_read_byte//Input:

i2c_rw_addr

i2c._rw_cnt

//i2c_rw_temp

//eeprom_read_byte:

i2c_rw_cmd=EEPROM_RW_CMD;

gotoi2c_read_byte//X?

0a0aA16AmA£

（^10Xa

£

yAu:

eeprom_write_byte//Input:

//i2c_rw_byte

//X?

0a?

°

M?

6Ai§

6D^da^?

y0?

ifi?

a0O?

O?

D?

0X?

te?

fi

//eeprom_write_byte:

gotoi2c_write_byte//X?

0a0aAi6ApAfi（pl0Xa