应广单片机读写24C02程序代码.docx
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应广单片机读写24C02程序代码
应广单片机读写24C02程序代码
#include"extern.h〃
#include，zmain.h"
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1/
tf^//?
?
0aI2C?
0?
0
I2C_SDAequpb.2
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//?
?
0aI2C?
aA?
uchari2c_rw_addr;//?
AD?
M0O?
uchari2c_rw_byte;//?
AD?
fiy?
Yuchari2c_rw_cmd;//?
AD?
MAJ£?
?
t）M0O?
uchari2c_rw_temp;//?
AD?
?
y?
10D?
a?
aA?
uchari2c_rw_cnt;//?
AD?
?
y?
tOD?
a?
aA?
//
////?
u£uSTARTDA°A
i2c_start:
I2CSDAOUTPUT
I2C_SCL_0UTPUT
I2C_SDA_HIGH
delayI2C_L0NG_DLY
I2C_SCL_HIGH
delayI2C_L0NG_DLY
I2C_SDA_L0W
delayI2C_L0NG_DLY
I2C_SCL_L0W
delayI2C_L0NG_DLYret
//
//?
ufiiiSTOPDA0A
//
i2c_stop：
I2C_SCL_L0W
delayI2C_L0NG_DLY
I2C_SDA_L0W
delayI2C_L0NG_DLY
I2C_SCL_HIGH
delayI2C_L0NG_DLY
I2C_SDA_HIGH
delayI2C_L0NG_DLYret
//
//?
1?
QSALVEACKDAoA//
i2c_slave_ack：
//don'tcheckACK
I2C_SDA_INPUT
delayI2C_SH0RT_DLY
I2C_SCL_HIGH
delayI2C_SH0RT_DLY
I2C_SCL_LOW
delayI2C_SH0RT_DLY
I2C_SDA_0UTPUT
I2C_SDA_L0W
delayI2C_SH0RT_DLY
ret
//
//餡?
6MASTERACKDA°A//
i2c_master_ack：
I2C_SDA_0UTPUT
I2C_SDA_L0W
delayI2C_SH0RT_DLY
I2C_SCL_HIGH
delayI2C_SH0RT_DLY
I2C_SCL_LOW
delayI2C_SH0RT_DLY
ret
//
//骼?
6MASTERNACKDAoA//
i2c_master_nack:
I2C_SDA_0UTPUT
I2C_SDA_HIGH
delayI2C_SH0RT_DLY
I2C_SCL_HIGH
delayI2C_SH0RT_DLY
I2C_SCL_L0W
delayI2C_SH0RT_DLYret
//
//D?
0?
?
oXO?
0
//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
I2C_SCL_HIGH
delayI2C_SHORT_DLY
I2CSCLLOW
delayI2C_SH0RT_DLY
dzsni2c_rw_cnt
gotoi2c_write_8bit_loop
ret
//
//?
A0?
?
dxo?
0
//Used:
i2c__rw_cnt
//Output:
i2c_rw_temp//
i2c_read_8bit：
i2c_rw_temp=0;
i2crwent=8;
delayI2C_SHORT_DLY
i2c_read_8bit_loop:
I2C_SCL_HIGH
delayI2C_SHORT_DLY
swapcI2C_SDA
sici2c_rw_temp
I2C_SCL_LOW
delayI2C_SHORT_DLY
dzsni2c_rw_cnt
gotoi2c_read_8bit_loop
ret
//
//Input:
i2c_rw_addr//i2c_rw_cmd
//Used:
i2c__rw_cnt
//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
//slaveack
//don'tcheckACK
cal1i2c_slave_ack
//startrepeat
calli2c_start
//writedeviceaddress（read）i2c_rw_temp=i2c_rw_cmd;i2c_rw_temp・0二1;
calli2c_write_8bit
//slaveack
//don'tcheckACK
I2C_SDA_INPUT
delayI2C_SHORT_DLY
I2C_SCL_HIGH
delayI2C_SHORT_DLY
I2C_SCL_LOW
delayI2C_SHORT_DLY//OaAi?
10fia（；6?
dI2C_SDA?
?
6Axa?
fia?
d
//readdata
i2c_rw_temp=0;
calli2c_read_8bit
i2c_rw_byte=i2c_rw_temp;//storedata
//masternack
calli2c_master_nack
//stop
calli2c_stop
//retune
delayI2C_LONG_DLY
wdreset
ret
//
//Input:
i2c_rw_addr//i2c_rw_byte//i2c_rw_cmd//Used:
i2c_rw_cnt
//i2c_rw_temp//
i2c_write_byte:
//start
calli2c_start
//writedeviceaddressi2c_rw_temp=i2c_rw_cmd;
calli2c_write_8bit
//slaveack
//don'tcheckACK
calli2c_slave_ack
//writeregisteraddressi2c_rw_temp=i2c_rw_addr;
calli2c_write_8bit
//slaveack
//don'tcheckACK
cal1i2c_slave_ack
//writedata
i2c_rw_temp=i2c_rw_byte;
calli2c_write_8bit
//slaveack
//don'tcheckACK
calli2c_slave_ack
//stop
calli2c_stop
//retune
delayI2C_L0NG_DLY
wdreset
ret
EEPRONLRW.CN©equOxAO
////°?
CyAu:
eeprom_read_byte//Input:
i2c_rw_addr
//Used:
i2c._rw_cnt
//i2c_rw_temp
//Output:
i2c_rw_byte
//eeprom_read_byte:
i2c_rw_cmd=EEPROM_RW_CMD;
gotoi2c_read_byte//X?
0a0aA16AmA£（^10Xa
////°?
£yAu:
eeprom_write_byte//Input:
i2c_rw_addr
//i2c_rw_byte
//Used:
i2c__rw_cnt
//i2c_rw_temp
//X?
0a?
°M?
6Ai§°6D^da^?
y0?
?
ifi?
?
a0O?
?
O?
D?
?
0X?
te?
fi
//eeprom_write_byte:
i2c_rw_cmd=EEPROM_RW_CMD;
gotoi2c_write_byte//X?
0a0aAi6ApAfi（pl0Xa
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