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標題: 單片機+24c02c是怎么讀跟寫的呢? [打印本頁]

作者: 99334 時間: 2020-6-5 15:26
標題: 單片機+24c02c是怎么讀跟寫的呢?
定時器實現秒表，每一秒寫入24C02C一次，秒數可以用液晶1602第一行顯示。顯示格式為“miaoshu：**”，其中**代表具體的秒數。重新上電后，從上一次寫入的秒數開始計時。下面我自己寫的，讀和寫都沒有顯示出來
#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit sda=P3^1;
sbit scl=P3^0;
sbit dx=P2^6;
sbit wx=P2^7;
uchar  sec,tcnt;
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void delay()
{;;}
void delayms(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void start()
{
sda=1;
delay();
scl=1;
delay();
sda=0;
delay();
}
void stop()
{
sda=0;
delay();
scl=1;
delay();
sda=1;
delay();
}
void respons()
{
uchar i;
scl=1;
delay();
while((sda==1)&&(i<250))i++;
scl=0;
delay();
}
void init()
{
sda=1;
delay();
scl=1;
delay();
}
void write_byte(uchar date)
{
uchar i,temp;
temp=date;
for(i=0;i<8;i++)
{
   temp=temp<<1;
      scl=0;
      delay();
      sda=CY;
      delay();
      scl=1;
      delay();
}
scl=0;
delay();
sda=1;
delay();
}
uchar read_byte()
{
uchar i,k;
scl=0;
delay();
sda=1;
delay();
for(i=0;i<8;i++)
{
   scl=1;
      delay();
      k=(k<<1)|sda;
      scl=0;
      delay();
}
return k;
}
void write_add(uchar address,uchar date)
{
start();
write_byte(0xa0);
respons();
write_byte(address);
respons();
write_byte(date);
respons();
stop();
}
uchar read_add(uchar address)
{
uchar date;
start();
write_byte(0xa0);
respons();
write_byte(address);
respons();
start();
write_byte(0xa1);
respons();
date=read_byte();
stop();
return date;
}
void display(uchar shi,uchar ge)
{
P0=0xff;
delayms(1);
wx=1;
P0=0xfe;
wx=0;
P0=0xff;
delayms(1);
dx=1;
P0=table[shi];
dx=0;
P0=0xff;
delayms(1);
wx=1;
P0=0xfd;
wx=0;
P0=0xff;
delayms(1);
dx=1;
P0=table[ge];
dx=0;

}
void main()
  {
init();
sec=read_add(1);
if(sec>60)sec=0;

  TMOD=0x01;
  ET0=1;
  EA=1;
  TH0=(65536-50000)/256;
  TL0=(65536-50000)%256;
  TR0=1;
  while(1)
  {
display(sec/10,sec%10);

      if(tcnt==20)
{
write_add(1,sec);
tcnt=0;
      sec++;
      if(sec==60)
      sec=0;
}
  }

  }

  void t0()interrupt 1
  {
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
tcnt++;
  }

作者: hotpet 時間: 2020-6-6 01:25
用仿真里面的 I2C DEBUG 工具看一下一般都可以找到原因，還有兩根線都要加上拉電阻。

歡迎光臨 (http://m.raoushi.com/bbs/)