AT24C256完整程序

1、/* AT24C64C语言程序 copyrightlance */ #include "c8051F020.h"#include "24C256.h"#include "LCD_display.h" sbit ISCL = P14;sbit ISDA = P13; /* I2c Wait Wait for some time to get proper I2C timing */ void I2cWait(void) / unsigned int i=10; /24C64 unsigned int i=5;/24C256 while(

2、i-); /* i2c start condition SDA 1-0 while SCL=1 */ void I2cStart(void) ISDA=1; ISCL=1; I2cWait(); ISDA=0; I2cWait(); ISCL=0; I2cWait(); /* I2c sotp condition SDA=0-1 while SCL=1 */ void I2cStop(void) ISDA=0; I2cWait(); ISCL=1; I2cWait(); ISDA=1; I2cWait(); /* I2c Init Initialize I2C interface Releas

3、e I2c BUS * void I2cInit(void) ISDA=1; ISCL=1; I2cWait(); */ /* I2c SentByte master transfer data to slave and return acknowledge bit don't include<intrins.h> */ bit I2cSentByte(unsigned char bytedata) unsigned char i; bit ack; for(i=0;i<8;i+) if(bytedata & 0x80) ISDA=1; else ISDA=0

4、; bytedata<<=1; I2cWait(); ISCL=1; I2cWait(); ISCL=0; I2cWait(); ISDA=1; I2cWait(); ISCL=1; I2cWait(); ack=ISDA; ISCL=0; I2cWait(); return ack; /* I2c ReceiveByte slave trransfer data to master */ unsigned char I2cReceiveByte(void) unsigned char i; unsigned char bytedata=0; ISCL=0; I2cWait();

5、for(i=0;i<8;i+) ISCL=1; I2cWait(); bytedata=bytedata<<1; if(ISDA=1) bytedata = bytedata|0x01; I2cWait(); ISCL=0; I2cWait(); return bytedata; /* I2c SendAcknowledge Master send acknowledge bit to slave acknowledge="0",non-acknowledge="1" */ void SendAcknowledge(bit ack) I

6、SDA=ack; ISCL=1; I2cWait(); ISCL=0; /* 24c64 WriteByte addr:0-8192 value:数据 */ void _24c64WriteByte(unsigned int addr,unsigned char value) I2cStart(); I2cSentByte(0xA0); I2cSentByte(addr>>8); /送高位地址 I2cSentByte(addr&0xff); /送低位地址 I2cSentByte(value); I2cStop(); delay1ms(15); /* 24c64 WriteM

7、ulti page:0-255 count:要写入的数个数 */void _24c64WriteMulti(unsigned int page,unsigned char count,unsigned char *SenBuf) unsigned char i; unsigned int addr=page*32; I2cStart(); I2cSentByte(0xa0); I2cSentByte(addr>>8); /送高位地址 I2cSentByte(addr&0x00ff); /送低位地址 for(i=0;i<count;i+) I2cSentByte(Sen

8、Bufi); I2cStop(); delay1ms(15); /* 24c64 ReadByte addr:0-8192 */ unsigned char _24c64ReadByte(unsigned int addr) unsigned char temp; I2cStart(); I2cSentByte(0xa0); I2cSentByte(addr>>8); /送高位地址 I2cSentByte(addr&0x00ff); /送低位地址 I2cStart(); I2cSentByte(0xa1); temp=I2cReceiveByte(); SendAcknowledge(1); I2cStop(); return temp; /* 24c64 ReadMulti page:0-256,count0-32 count:要读出的数的个数 */ void _24c64ReadMulti(unsigned int page,unsigned char count,unsigned char *RedBuf)