?? 24c16wrrd.txt
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#include <reg51.h>
#include<absacc.h>
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long
#define PA8155 XBYTE[0x7101]
#define PB8155 XBYTE[0x7102]
#define COM8155 XBYTE[0x7100]
#define WriteDeviceAddress 0xa0 //定義器件在IIC總線中的地址
#define ReadDviceAddress 0xa1
sbit SCL=P1^6;
sbit SDA=P1^7;
unsigned int tab[10]={0xfc,0x60,0xda,0xf2,0x66,0xb6,0xbe,0xe0,0xfe,0xf6};//0~9的段碼
//定時函數
void DelayMs(unsigned int number)
{
unsigned char temp;
for(;number!=0;number--)
{
for(temp=112;temp!=0;temp--) ;
}
}
void delay(uchar i) //延時函數
{
while(i--);
}
//開始總線
void Start()
{
SDA=1;
SCL=1;
SDA=0;
SCL=0;
}
//結束總線
void Stop()
{
SCL=0;
SDA=0;
SCL=1;
SDA=1;
}
//發ACK0
void NoAck()
{
SDA=1;
SCL=1;
SCL=0;
}
//測試ACK
bit TestAck()
{
bit ErrorBit;
SDA=1;
SCL=1;
ErrorBit=SDA;
SCL=0;
return(ErrorBit);
}
//寫入8個bit到24c16
Write8Bit(unsigned char input)
{
unsigned char temp;
for(temp=8;temp!=0;temp--)
{
SDA=(bit)(input&0x80);
SCL=1;
SCL=0;
input=input<<1;
}
}
//寫入一個字節到24c16中
void Write24c16(uchar ch,uchar address)
{
Start();
Write8Bit(WriteDeviceAddress);
TestAck();
Write8Bit(address);
TestAck();
Write8Bit(ch);
TestAck();
Stop();
DelayMs(10);
}
//從24c16中讀出8個bit
uchar Read8Bit()
{
unsigned char temp,rbyte=0;
for(temp=8;temp!=0;temp--)
{
SCL=1;
rbyte=rbyte<<1;
rbyte=rbyte|((unsigned char)(SDA));
SCL=0;
}
return(rbyte);
}
//從24c16中讀出1個字節
uchar Read24c16(uchar address)
{
uchar ch;
Start();
Write8Bit(WriteDeviceAddress);
TestAck();
Write8Bit(address);
TestAck();
Start();
Write8Bit(ReadDviceAddress);
TestAck();
ch=Read8Bit();
NoAck();
Stop();
return(ch);
}
void display(uchar t,uchar tt)
{
uint t1,t2,t3,t4;
uint m,z;
t1=t/10;
t2=t%10;
PA8155=0x10; //選中數碼管
PB8155=tab[t2]; //送段碼給數碼管顯示給
delay(300); //各個數碼管之間的延時
PA8155=0x20; //選中數碼管
PB8155=tab[t1]; //送段碼給數碼管顯示
delay(300);
t3=tt/10;
t4=tt%10;
PA8155=0x40; //選中數碼管
PB8155=tab[t4]; //送段碼給數碼管顯示給
delay(300); //各個數碼管之間的延時
PA8155=0x80; //選中數碼管
PB8155=tab[t3]; //送段碼給數碼管顯示
delay(300);
}
// 主程序
void main(void)
{
uchar c1,c2;
COM8155=0x03;
c1=0;
c2=0;
Write24c16(0x05,0x02); //向02H地址單元寫入05H
c1=Read24c16(0x02); //從地址02H中讀取數據
Write24c16(0x20,0x10); //向03H地址單元寫入10H
c2=Read24c16(0x10); //從地址03H中讀取數據
while(1)
{
display(c1,c2); //將讀取的兩個數顯示在數碼管上
}
}
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