如何向 AT24C02 存储大于 256 的数据 -

标题: 如何向 AT24C02 存储大于 256 的数据 [打印本页]

作者: liliwei5 时间: 2014-12-13 12:31
标题: 如何向 AT24C02 存储大于 256 的数据

如我要存储 98888，有办法吗？谢谢

作者: admin 时间: 2014-12-13 13:37
你可以分成5次来存储

作者: exv 时间: 2014-12-13 19:24
使用BCD码，每一位用4个bits，5个位建议用3个字节。

作者: mqwu 时间: 2014-12-15 11:26
用最通用的PIC16F877 硬件I2C 要分四次写入和读出这个数据，请看下面的source code
#define uint unsigned int
#define ulong unsigned long
uint Databuf1, Databuf2;
ulong Databuf;
void Write_AT24C02(uchar WriteAddr,uchar Databuf)
{
SEN=1;
while(SEN==1);
SSPIF=0;

SSPBUF=0xA0;
while(SSPIF==0);    //?¡à|ì?¡¤¡é?¨a¨a¨o¡à??a?1
SSPIF=0;

SSPBUF=WriteAddr;
while(SSPIF==0);
SSPIF=0;

SSPBUF=Databuf;
while(SSPIF==0);
SSPIF=0;

PEN=1;
while(PEN==1);
SSPIF=0;
}

unsigned Read_AT24C02(uchar Addr)
{
unsigned char buf;
SEN=1;
while(SEN==1);
SSPIF=0;

SSPBUF=0xA0;
while(SSPIF==0);
SSPIF=0;

SSPBUF=Addr;
while(SSPIF==0);
SSPIF=0;

RSEN=1;
while(SSPIF==0);
SSPIF=0;

SSPBUF=0xA1;          //¡¤¡é?¨aAT24C02|ì??¡Â?t|ì??¡¤o¨a?¨￠D?o?
while(SSPIF==0);    //?¡à|ì?¡¤¡é?¨a¨a¨o¡à??a?1
SSPIF=0;             //??SSPIF¡à¨o????

RCEN=1;             //¨|¨¨???¨￠?¨oD¨a
while(SSPIF==0);    //?¡à|ì?¡¤¡é¨a¨o?a?1
buf=SSPBUF;          //?¨￠3?¨oy?Y¡¤?¨¨?buf?D?Y¡ä?
ACKDT=1;             //?¡ä¨¨¡¤¨¨?¨oy?Y??
ACKEN=1;             //¡¤¡é?¨a¨®|¡äeD?o?
while(SSPIF==0);    //?¡à|ì?¡¤¡é?¨a¨a¨o¡à??a?1
SSPIF=0;             //??SSPIF¡à¨o????

PEN=1;                //2¨2¨|¨2IIC¨a¡ê?1D?o?
while(PEN==1);       //?¡à|ì?¨a¡ê?1?a?1
SSPIF=0;             //??SSPIF¡à¨o????

return(buf);          //???¨￠3?¨oy?Y¡¤|ì??
}

Write_AT24C02(0x00,0xff);
Write_AT24C02(0x01,0xff);
Write_AT24C02(0x03,(98888-65536)/256);
Write_AT24C02(0x04,(98888-65536)%256);

Databuf1=Read_AT24C08(0x00);
Databuf1=Databuf<<8|Read_AT24C02(0x01);
Databuf2=Read_AT24C08(0x03);
Databuf2=Databuf<<8|Read_AT24C02(0x04);
Databuf=Databuf1|Databuf2;

作者: mqwu 时间: 2014-12-15 11:29
掉了一句伪指令： #define uchar unsigned char

作者: mqwu 时间: 2014-12-15 11:37
笔误更正
Databuf1=Read_AT24C08(0x00);
Databuf1=Databuf1<<8|Read_AT24C02(0x01);
Databuf2=Read_AT24C08(0x03);
Databuf2=Databuf2<<8|Read_AT24C02(0x04);
Databuf=Databuf1|Databuf2;

作者: mqwu 时间: 2014-12-15 11:43
笔误更正
Databuf1=Read_AT24C02(0x00);
Databuf1=Databuf1<<8|Read_AT24C02(0x01);
Databuf2=Read_AT24C02(0x03);
Databuf2=Databuf2<<8|Read_AT24C02(0x04);
Databuf=Databuf1|Databuf2;

作者: Jodelin 时间: 2017-4-8 18:14
就是呀，可以拆开来存储的

欢迎光临 (http://www.51hei.com/bbs/)