這個實驗中，我想通過串口給eeprom，然后通過讀eeprom在傳給P0口讓數碼管顯示相應的數字
在串口調試助手中顯示發(fā)送成功 但不能通過P0口給數碼管
另外剛開始是為啥數碼管不是全滅 （共陽極 ）
#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
// 共陽極數碼管字模 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e
sbit sclk=P2^0;
sbit sda=P2^1;
uchar flag,tem1,tem2,num;
void delay();
void init_uart();
void init_I2C();
void I2C_start();
void I2C_end();
void send_byte(uchar temp);
uchar read_byte();
void respond ();
void eeprom_write (uchar address,uchar dat);
uchar eeprom_read (uchar address );
void delay1(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=123;y>0;y--);
}
void main()
{
P1=0;
init_I2C();
init_uart();
while(1)
{
if(flag==1)
{
eeprom_write (23,num);
delay1(100);
P1=eeprom_read (23);
flag=0;
REN=1;
}
}
}
void delay()
{
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
}
void init_uart()
{
TMOD=0x20;
TH1=0xf3;
TL1=0xf3;
REN=1;
TR1=1;
EA=1;
ES=1;
}
void init_I2C()
{
sclk=1;
sda=1;
}
void I2C_start()
{
sclk=1;
delay();
sda=1;
delay();
sda=0;
delay();
sclk=0;
}
void I2C_end()
{
sclk=0;
delay();
sda=0;
delay();
sclk=1;
delay();
sda=1;
}
void send_byte(uchar date)
{
uchar temp,i;
temp=date;
for(i=0;i<8;i++)
{
temp=temp<<1;
sclk=0;
delay();
sda=CY;
delay();
sclk=1;
delay();
}
sclk=0;
delay();
sda=1;
delay();
}
uchar read_byte()
{
uchar temp,i;
temp=0x00;
for(i=0;i<8;i++)
{
sclk=0;
delay();
if(sda)
temp=temp|0x01;
temp<<=1;
}
return temp;
}
void respond ()
{
uchar i;
sclk=1;
delay();
while((sda==1)&&(i<250))i++;
sclk=0;
delay();
}
void eeprom_write (uchar address,uchar dat)
{
I2C_start();
send_byte(0xa0);
respond();
send_byte(address);
respond();
send_byte(dat);
respond();
I2C_end();
}
uchar eeprom_read (uchar address)
{
uchar num;
I2C_start();
send_byte(0xa0);
respond();
send_byte(address);
respond();
I2C_start();
send_byte(0xa1);
respond();
num=read_byte();
I2C_end();
return num;
}
void ser() interrupt 4
{
RI=0;
num=SBUF;
REN=0;
flag=1;
}
| 
