24c02存储多个数据

24c02存储多个数据

#include

#include

#define uint unsigned int

#define uchar unsigned char

sbit sda = P2 ^ 0; //IO口定义

sbit scl = 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。

char code music[] = {

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

uchar data buffer[100]; //用于缓存从24c02中读取的数据。

delay(unsigned int m)

{

unsigned int n, p;

for (n = m; n>0; n--)

for (p = 125; p>0; p--);

}

void nop()

{

_nop_();

_nop_();

}

/////////24C02读写驱动程序//////////////////// void delay1(unsigned int m)

{

unsigned int n;

for (n = 0; n

}

void init() //24c02初始化子程序

{

scl = 1;

nop();

sda = 1;

nop();

}

void start() //启动I2C总线

{

sda = 1;

nop();

scl = 1;

nop();

sda = 0;

nop();

scl = 0;

nop();

}

void stop() //停止I2C总线

{

sda = 0;

nop();

scl = 1;

nop();

sda = 1;

nop();

}

void writebyte(unsigned char j) //写一个字节{

unsigned char i, 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();

}

unsigned char readbyte() //读一个字节

{

unsigned char i, 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);

}

void clock() //I2C总线时钟

{

unsigned char i = 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///// unsigned char read24c02(unsigned char address)

{

unsigned char i;

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/////

void write24c02(unsigned char address, unsigned char info) {

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sda上取得数据后，还需要一定时间的烧录过程。

}

void main()

{

uchar add, i, j, m;

init(); //初始化24C02

P1 = 0X55;

while (add != sizeof(music))

{

write24c02(0x00 + add, music[add]);

add++;

if (add % 4 == 0)

P1 = ~P1;

}

P1 = 0X00;

//到此为止，向24C02中写入数据的过程均已结束。下面的程序为附加的。

//将已写入的数据再读出，送到P1口，通过观察led的亮灭来检验写入的数据是否正确。

while (m != add)

{

buffer[i] = read24c02(m);

i++;

m++;

}

while (j != add)

{

P1 = buffer[j];

j++;

delay(1000);

}

while (1);

}