单片机控制I2C读写串行EEPROM.doc

/* I2CEEPROM*KEVIN 2011-09-07*/#include#include#define uchar unsigned char#define uint unsigned intsbit scl=P15;sbit sda=P36;sbit key1=P32;sbit key2=P33;sbit key3=P34;uchar a10=0xff;/*10ms*del*/void Delay_10ms(uint del)uint i,j;for(i=0; idel; i+)for(j=0; j1827; j+);/*/void start()sda=1;_nop_();scl=1;_nop_();sda=0;_nop_();scl=0;_nop_();/*/void stop()sda=0;_nop_();scl=1;_nop_();sda=1;_nop_();scl=0;_nop_();/*/void nack()sda=1;_nop_();scl=1;_nop_();scl=0;_nop_();sda=0;/*/void ack()sda=0;_nop_();scl=1;_nop_();scl=0;_nop_();sda=1;/*/void ack_test()/uchar i;scl=1;_nop_();sda=1;while(1)if(sda=1);elsebreak;scl=0;_nop_();/*/void writebyte(uchar input)uchar i,temp;temp=input;for(i=0;i8;i+)temp=temp1;scl=0;_nop_();sda=CY;_nop_();scl=1;_nop_();scl=0;_nop_();/*/uchar readbyte()uchar i,rbyte;for(i=0;i8;i+)scl=1;_nop_();rbyte=(rbyte1)|sda;scl=0;_nop_();return rbyte;/*/void Page_write(uchar add,uchar ddata)uchar i;Delay_10ms(10);/stop()start()start();writebyte(0xa0);ack_test();writebyte(add);/ack_test();for(i=0;i10;i+)writebyte(ddata);ack_test();ddata=_cror_(ddata,1);/stop();/*/void Byte_write(uchar add,uchar ddata)Delay_10ms(10);/start();writebyte(0xa0);ack_test();writebyte(add);/ack_test();writebyte(ddata);/ack_test();stop();void main()uchar i;Byte_write(0x00,0x7e);/0x7e0x00Byte_write(0x01,0xe7);/0xe70x01Page_write(0x10,0x7f);/0x7f0x10while(1)while(key1=0)start();/writebyte(0xa0);/ack_test();writebyte(0x00);/ack_test();start();writebyte(0xa1);/ack_test();P0=readbyte();nack();while(key2=0)start();/writebyte(0xa0);/ack_test();writebyte(0x01);/ack_test();start();writebyte(0xa1);/ack_test();P0=readbyte();nack();while(key3=0)start();writebyte(0xa0);/ack_test();writebyte(0x10);/ack_test();start();writebyte(0xa1);ack_test