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#include<reg51.h>
unsigned char i=1;
unsigned char ACK=1;
void delay() //延時(shí)函數(shù)
{
unsigned char i,j;
for(i=255;i>0;i--)
for(j=100;j>0;j--){}
}
unsigned char kbscan() //鍵盤掃描函數(shù)
{
unsigned char sccode,recode; //定義行、列
P1=0xf0; //高四位作為輸入先寫1
if((P1&0xf0)!=0xf0) //判斷是否按鍵按下
{
delay(); //延時(shí)消抖
if((P1&0xf0)!=0xf0) //再次判斷判斷有沒有按鍵按下
{
sccode=0xfe;
while((sccode&0x10)!=0)
{
P1=sccode;
if((P1&0xf0)!=0xf0) //判斷當(dāng)前行是否有按鍵按下
{
recode=P1&0xf0; //保留高四位輸入值
sccode=sccode&0x0f; //保留第低四位的值
return(recode+sccode);
}
else
sccode=(sccode<<1)|0x01;
}
}
}
return 0;
}
send()interrupt 4 //串行口通信中斷
{
if(TI==1&&ACK==1)
{
TI=0;
if(i==0||i==0x22||i==0x44||i==0x66||i==0x88||i==0xaa||i==0xcc||i==0xdd||i==0xee) //有按鍵按下，需要修改波特率
{
ACK=0;
SBUF=i; //發(fā)送數(shù)據(jù)
}
else if(i==11) //循環(huán)發(fā)送，發(fā)了十一個(gè)字符后重新發(fā)
{
i=1;
SBUF=1;
}
else
{
i++;
SBUF=i; //發(fā)送數(shù)據(jù)
}
}
else if(RI==1) //接收回應(yīng)的信號(hào)
{
RI=0;
ACK=SBUF; //接收回應(yīng)信號(hào) 修改初值觸發(fā)串口通信中斷
TI=1;
TH1=TL1=i;
i=1;
}
}
void main()
{
TMOD=0x20;
TH1=0x00;TL1=0x00; //置初值
TR1=1;EA=1;ES=1; //使T1開始工作；開總中斷、串行中斷
SCON=0x50; //使T1工作在工作方式1
SBUF=i;
while(1)
{
while(kbscan())
{
switch(kbscan()) //不同的按鍵對(duì)應(yīng)不同的波特率
{
case 0xeb:i=0x00;break;
case 0xdb:i=0x22;break;
case 0xbb:i=0x44;break;
case 0xed:i=0x66;break;
case 0xdd:i=0x88;break;
case 0xbd:i=0xaa;break;
case 0xee:i=0xcc;break;
case 0xde:i=0xdd;break;
case 0xbe:i=0xee;break;
}
}
}
}

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#include<reg51.h>
#define LCD_DATA P0
sbit LCD_BUSY=LCD_DATA^7;
sbit LCD_RW=P3^3;
sbit LCD_RS=P3^2;
sbit LCD_EN=P3^4;
sbit P20=P2^0;
sbit P21=P2^1;
sbit P22=P2^2;
sbit P23=P2^3;
sbit P24=P2^4;
sbit P25=P2^5;
sbit P26=P2^6;
sbit P27=P2^7;
sbit P30=P3^0;
sbit P31=P3^1;
sbit P32=P3^2;
sbit P33=P3^3;
sbit P34=P3^4;
sbit P35=P3^5;
sbit P36=P3^6;
sbit P37=P3^7;
unsigned char i=0;
void LCD_check_busy(void) //檢測(cè)LCD狀態(tài)
{
while(1)
{
LCD_RS=0;
LCD_RW=1;
LCD_EN=0;
LCD_DATA=0xff;
LCD_EN=1;
if(!LCD_BUSY)break;
LCD_EN=0;
}
}
void LCD_cls(void) //LCD清屏
{
LCD_check_busy();
LCD_EN=0;
LCD_RS=0;
LCD_RW=0;
LCD_DATA=0x01;
LCD_EN=1;
LCD_EN=0;
}
void LCD_write_instruction(unsigned char LCD_instruction)//寫指令到LCD
{
LCD_check_busy();
LCD_EN=0;
LCD_RS=0;
LCD_RW=0;
LCD_DATA=LCD_instruction;
LCD_EN=1;
LCD_EN=0;
}
void LCD_write_data(unsigned char LCD_data)//輸出一個(gè)字節(jié)數(shù)據(jù)到LCD
{
LCD_check_busy();
LCD_EN=0;
LCD_RS=1;
LCD_RW=0;
LCD_DATA=LCD_data;
LCD_EN=1;
LCD_EN=0;
}
void LCD_initial()
{
LCD_write_instruction(0x38); //兩行顯示
LCD_write_instruction(0x0C); //顯示開
LCD_write_instruction(0x06); //光標(biāo)加1
LCD_write_instruction(0x01); //清屏
}
re() interrupt 4 //串行口通信中斷
{
if(RI==1)
{
RI=0;
i=SBUF; // 接收數(shù)據(jù)
if(i==0||i==0x22||i==0x44||i==0x66||i==0x88||i==0xaa||i==0xcc||i==0xdd||i==0xee)
{
SBUF=1; //接收發(fā)過來要修改的初值
}
else //接收正常通信的數(shù)據(jù)
{
LCD_write_instruction(0x80+i);
LCD_write_data('0'+i);
if(i==11)LCD_initial();
}
}
else if(TI==1)
{
TI=0;
TH1=i;TL1=i; //發(fā)送確認(rèn)信號(hào)后修改初值
}
}
void main()
{
TMOD=0x20;
TH1=0x00;TL1=0x00; //置初值
TR1=1;EA=1;ES=1; //使T1開始工作；開總中斷、串行中斷
SCON=0x50; //使T1工作在工作方式1
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