24c02存储多个数据.doc

--------------------------校验:_____________-----------------------日期:_____________24c02存储多个数据24c02存储多个数据#include#include#defineuintunsignedint#defineucharunsignedcharsbitsda=P2^0;//IO口定义sbitscl=P2^1;//此为待写入24c02的数据。为了便于验证结果,数组的内容为周期重复的。charcodemusic[]={ 0x55,0xaa,0x0f,0xf0,0x55,0xaa,0x0f,0xf0,0x55,0xaa,0x0f,0xf0, 0x55,0xaa,0x0f,0xf0,0x55,0xaa,0x0f,0xf0,0x55,0xaa,0x0f,0xf0, 0x55,0xaa,0x0f,0xf0,0x55,0xaa,0x0f,0xf0,0x55,0xaa,0x0f,0xf0, 0x55,0xaa,0x0f,0xf0,0x55,0xaa,0x0f,0xf0,0x55,0xaa,0x0f,0xf0, 0x55,0xaa,0x0f,0xf0,0x55,0xaa,0x0f,0xf0,0x55,0xaa,0x0f,0xf0}; //由于最后还要讲这些数据读出送到P1口,故可发现P1口相连的led有规律地闪烁15个周期uchardatabuffer[100];//用于缓存从24c02中读取的数据。delay(unsignedintm){ unsignedintn,p; for(n=m;n>0;n--) for(p=125;p>0;p--);}voidnop(){ _nop_(); _nop_();}/////////24C02读写驱动程序////////////////////voiddelay1(unsignedintm){ unsignedintn; for(n=0;n<m;n++);}voidinit()//24c02初始化子程序{ scl=1; nop(); sda=1; nop();}voidstart()//启动I2C总线{ sda=1; nop(); scl=1; nop(); sda=0; nop(); scl=0; nop();}voidstop()//停止I2C总线{ sda=0; nop(); scl=1; nop(); sda=1; nop();}voidwritebyte(unsignedcharj)//写一个字节{ unsignedchari,temp; temp=j; for(i=0;i<8;i++) { temp=temp<<1; scl=0; nop(); sda=CY; //temp左移时,移出的值放入了CY中 nop(); scl=1; //待sda线上的数据稳定后,将scl拉高 nop(); } scl=0; nop(); sda=1; nop();}unsignedcharreadbyte()//读一个字节{ unsignedchari,j,k=0; scl=0;nop();sda=1; for(i=0;i<8;i++) { nop();scl=1;nop(); if(sda==1) j=1; else j=0; k=(k<<1)|j; scl=0; } nop(); return(k);}voidclock()//I2C总线时钟{ unsignedchari=0; scl=1; nop(); while((sda==1)&&(i<255)) i++; scl=0; nop();}////////从24c02的地址address中读取一个字节数据/////unsignedcharread24c02(unsignedcharaddress){ unsignedchari; start(); writebyte(0xa0); clock(); writebyte(address); clock(); start(); writebyte(0xa1); clock(); i=readbyte(); stop(); delay1(100); return(i);}//////向24c02的address地址中写入一字节数据info/////voidwrite24c02(unsignedcharaddress,unsignedcharinfo){ start(); writebyte(0xa0); clock(); writebyte(address); clock(); writebyte(info); clock(); stop(); delay1(5000);//这个延时一定要足够长,否则会出错。因为24c02在从sd