LCD按键输入.docx

#include<reg51.h>
#include<intrins.h>
#defineucharunsignedchar
#definekeyportP1
sbitRS=P2^4;
sbitRW=P2^5;
sbitEN=P2^6;
ucharcodetab[16]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
bitkeyflag;
voiddelayus(uchart)
{
while(--t);
}

voiddelayms(uchart)
{
while(t--)
{
delayus(245);
delayus(245);
}
}

voidLCD_readbusy(void)
{
P0=0Xff;
RS=0;
RW=1;
EN=1;
while(P0&0x80);
_nop_();
EN=0;
}

voidLCD_write_com(ucharcom)
{
LCD_readbusy();
RS=0;
RW=0;
EN=1;
P0=com;
_nop_();
EN=0;
}

voidLCD_write_Data(ucharData)
{
LCD_readbusy();
RS=1;
RW=0;
EN=1;
P0=Data;
_nop_();
EN=0;
}

voidLCD_clear(void)
{
LCD_write_com(0x01);
delayms(5);
}

voidLCD_write_char(ucharx,uchary,ucharData)
{
if(y==0)
{
LCD_write_com(0x80+x);
}
else
{
LCD_write_com(0xc0+x);
}
LCD_write_Data(Data);
}

voidLCD_write_string(ucharx,uchary,uchar*p)
{
if(y==0)
{
LCD_write_com(0x80+x);
}
else
{
LCD_write_com(0xc0+x);
}
while(*p)
{
LCD_write_Data(*p);
p++;
}
}

voidLCD_init(void)
{
LCD_write_com(0x38);
delayms(5);
LCD_write_com(0x38);
delayms(5);
LCD_write_com(0x38);
delayms(5);
LCD_write_com(0x38);
LCD_write_com(0x08);
LCD_write_com(0x01);
LCD_write_com(0x06);
delayms(5);
LCD_write_com(0x0c);
}

ucharkeyscan(void)
{
ucharh,l;
P1=0xf0;
if(P1!=0xf0)
{
delayms(15);
if(P1!=0xf0)
{
P1=0x0f;
h=P1&0x0f;
P1=0xf0;
l=P1&0xf0;

while(P1!=0xf0);
return(h+l);
}
return(0xff);
}
}

ucharkeypro(void)
{
switch(keyscan())
{
case0x7e:return0;break;//0按下相应的键显示相对应的码值
case0xbe:return1;break;//1
case0xde:return2;break;//2
case0xee:return3;break;//3

case0x7d:return4;break;//4
case0xbd:return5;break;//5
case0xdd:return6;break;//6
case0xed:return7;break;//7

case0x7b:return8;break;//8
case0xbb:return9;break;//9
case0xdb:return10;break;//a
case0xeb:return11;break;//b

case0x77:return12;break;//c
case0xb7:return13;break;//d
case0xd7:return14;break;//e
case0xe7:return15;break;//f
default:return0xff;break;
}
}

voidp_INT0()interrupt0
{
keyflag=1;
}

voidmain()
{
ucharnum;
uchari=0,j=0;
LCD_init();
EA=1;//全局中断开
EX0=1;//外部中断0