应广单片机系列——用I2C接口读写EEPROM

应广单片机系列——用I2C接口读写EEPROM

本例仅供参考，欢迎指正程序中的问题

//byteXmsbytems_cnt

//bytetest_addrbytetest_data

.romadr0x000gotomain0gotomain1

.romadr0x010isr_entry:pushafintrq = 0popafreti

//----------------------------//产生START信号//----------------------------i2c_start:I2C_SDA_OUTPUTI2C_SCL_OUTPUTI2C_SDA_HIGHdelayI2C_LONG_DLYI2C_SCL_HIGHdelayI2C_LONG_DLYI2C_SDA_LOWdelayI2C_LONG_DLYI2C_SCL_LOWdelayI2C_LONG_DLYret

//----------------------------//产生STOP信号//----------------------------i2c_stop:I2C_SCL_LOWdelayI2C_LONG_DLYI2C_SDA_LOWdelayI2C_LONG_DLYI2C_SCL_HIGHdelayI2C_LONG_DLYI2C_SDA_HIGHdelayI2C_LONG_DLY//I2C_SCL_INPUTI2C_SDA_INPUTret

//----------------------------//检查SALVE ACK信号//----------------------------i2c_slave_ack://don't check ACKI2C_SDA_INPUTdelayI2C_SHORT_DLYI2C_SCL_HIGHdelayI2C_SHORT_DLYI2C_SCL_LOWdelayI2C_SHORT_DLYI2C_SDA_OUTPUTI2C_SDA_LOWdelayI2C_SHORT_DLYret

//----------------------------//输出MASTER ACK信号//----------------------------i2c_master_ack:I2C_SDA_OUTPUTI2C_SDA_LOWdelayI2C_SHORT_DLYI2C_SCL_HIGHdelayI2C_SHORT_DLYI2C_SCL_LOWdelayI2C_SHORT_DLYret

//----------------------------//输出MASTER NACK信号//----------------------------i2c_master_nack:I2C_SDA_OUTPUTI2C_SDA_HIGHdelayI2C_SHORT_DLYI2C_SCL_HIGHdelayI2C_SHORT_DLYI2C_SCL_LOWdelayI2C_SHORT_DLYret

//------------------------------//写一个字节//Input: i2c_rw_temp//Used: i2c_rw_cnt//------------------------------i2c_write_8bit:i2c_rw_cnt = 8i2c_write_8bit_loop:slci2c_rw_tempswapcI2C_SDAdelayI2C_SHORT_DLYI2C_SCL_HIGHdelayI2C_SHORT_DLYI2C_SCL_LOWdelayI2C_SHORT_DLYdzsni2c_rw_cntgotoi2c_write_8bit_loopret

//------------------------------//读一个字节//Used: i2c_rw_cnt//Output: i2c_rw_temp//------------------------------i2c_read_8bit:i2c_rw_temp = 0i2c_rw_cnt = 8delayI2C_SHORT_DLYi2c_read_8bit_loop:I2C_SCL_HIGHdelayI2C_SHORT_DLYswapcI2C_SDAslci2c_rw_tempI2C_SCL_LOWdelayI2C_SHORT_DLYdzsni2c_rw_cntgotoi2c_read_8bit_loopret

//------------------------------//Input: i2c_rw_addr// i2c_rw_cmd//Used: i2c_rw_cnt// i2c_rw_temp//Output: i2c_rw_byte//------------------------------i2c_read_byte://startcalli2c_start

//write device address(write)i2c_rw_temp = i2c_rw_cmdcalli2c_write_8bit

//slave ackcalli2c_slave_ack

//write register addressi2c_rw_temp = i2c_rw_addrcalli2c_write_8bit

//slave ack//don't check ACKcalli2c_slave_ack

//start repeatcalli2c_start

//write device address(read)i2c_rw_temp = i2c_rw_cmdi2c_rw_temp.0 = 1calli2c_write_8bit

//slave ack//don't check ACKI2C_SDA_INPUTdelayI2C_SHORT_DLYI2C_SCL_HIGHdelayI2C_SHORT_DLYI2C_SCL_LOWdelayI2C_SHORT_DLY//这里为特殊情况I2C_SDA不用转为输出

//read datai2c_rw_temp = 0calli2c_read_8biti2c_rw_byte = i2c_rw_temp//store data

//master nackcalli2c_master_nack

//stopcalli2c_stop

//retunedelayI2C_LONG_DLYwdresetret

//------------------------------//Input: i2c_rw_addr// i2c_rw_byte// i2c_rw_cmd//Used: i2c_rw_cnt// i2c_rw_temp//------------------------------i2c_write_byte://startcalli2c_start

//write device addressi2c_rw_temp = i2c_rw_cmdcalli2c_write_8bit

//slave ack//don't check ACKcalli2c_slave_ack

//write register addressi2c_rw_temp = i2c_rw_addrcalli2c_write_8bit

//slave ack//don't check ACKcalli2c_slave_ack

//write datai2c_rw_temp = i2c_rw_bytecalli2c_write_8bit

//slave ack//don't check ACKcalli2c_slave_ack

//stopcalli2c_stop

//retunedelayI2C_LONG_DLYwdresetret

EEPROM_RW_CMDequ0xA0//------------------------------//函数名: 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_CMDgotoi2c_read_byte//注意这里用的是跳转//------------------------------//函数名: eeprom_write_byte//Input: i2c_rw_addr// i2c_rw_byte//Used: i2c_rw_cnt// i2c_rw_temp//注意： 调用完后需要等待一段时间以保证写操作完成//------------------------------eeprom_write_byte:i2c_rw_cmd = EEPROM_RW_CMDgotoi2c_write_byte//注意这里用的是跳转

disgintinten = 0

pa = 0b0000_0000paph = 0b1101_0000pac = 0b0000_0001pb = 0b0000_0000pbph = 0b0000_0000pbc = 0b1111_1111

I2C_SDA_INPUTI2C_SCL_INPUT

delay200

mova,0b100_11_111movt16m,a

clkmd.1 = 1//enable watch dogwdreset

Xms = 100calldelayXms

test_data = 0test_addr = 0

main0_loop:wdreset

//写E2EPROMi2c_rw_addr = test_addri2c_rw_byte = test_datacalleeprom_write_byte

//调用EEPROM写操作函数后要等待一段时间，以保证数据写操作完成Xms = 20calldelayXms

//读E2EPROMi2c_rw_addr = test_addrcalleeprom_read_byteif(i2c_rw_byte != test_data){//读回的数据比较出错，判断为读写E2PROM出错nop}

test_addr ++test_data --

gotomain0_loop

//----------------FPPA1-------------------main1:sp = 52main1_loop:gotomain1_loop

本例代码是从实际程序中移植而来，已编译，未做最终调试

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