#include?“d:\c51\reg51.h“
#include?“d:\c51\intrins.h“


sbit?LCM_RS=P3^0;
sbit?LCM_RW=P3^1;
sbit?LCM_EN=P3^7;

#define?BUSY??		0x80??????????????//常量定義
#define?DATAPORT?	P1
#define?uchar?		unsigned?char
#define?uint???		unsigned?int
#define?L			50

uchar?str0[16]str1[16]count;
uint?speed;
unsigned?long?time;

void?ddelay（uint）;
void?lcd_wait（void）;
void?display（）;
void?initLCM（）;
void?WriteCommandLCM（uchar?WCLCMuchar?BusyC）;
void?STR（）;
void?account（）;


/*********延時K*1ms12.000mhz**********/

void?int0_isr（void）?interrupt?0?????????/*遙控使用外部中斷0接P3.2口*/
{
????unsigned?int?temp;
	time=count;
????TR0=0;
	temp=TH0;
	temp=（（temp?<????TH0=0x3c;
????TL0=0xaf;
	count=0;
????TR0=1;
	time=time*50000+temp;
}

void?time0_isr（void）?interrupt?1????????/*遙控使用定時計數器1?*/
{
???TH0?=0x3c;
???TL0?=0xaf;
???count++;
}

void?main（void）
{
???	TMOD=0x01;???????????????????????/*TMOD?T0選用方式1（16位定時）?*/
????IP|=0x01;???????????????????????????/*INT0?中斷優先*/
????TCON|=0x11;?????????????????????????/*TCON??EX0下降沿觸發啟動T0*/
????IE|=0x83;??
????TH0=0x3c;
????TL0=0xaf;
??
	initLCM（）;
???	WriteCommandLCM（0x011）;		????//清顯示屏
	for（;;）
	{
		account（）;
		display（）;
	}
}

void?account（）
{
	unsigned?long?a;?
	if?（time!=0）
	{
		a=L*360000000/time;
	}
	speed=a;
}



void?STR（）
{
	str0[0]=‘S‘;
	str0[1]=‘p‘;
	str0[2]=‘e‘;
????str0[3]=‘e‘;
	str0[4]=‘d‘;
	str0[5]=‘?‘;	
	str0[6]=（speed%100000）/10000+0x30;
	str0[7]=（speed%10000）/1000+0x30;
	str0[8]=（speed%1000）/100+0x30;
	str0[9]=‘.‘;
	str0[10]=（speed%100）/10+0x30;
	str0[11]=speed%10+0x30;
	str0[12]=‘k‘;
	str0[13]=‘m‘;
	str0[14]=‘/‘;
	str0[15]=‘h‘;
}

void?ddelay（uint?k）
{
????uint?ij;
????for（i=0;i????{
????????for（j=0;j<60;j++）
????????	{;}
????}
}
/**********寫指令到LCD子函數************/

void?WriteCommandLCM（uchar?WCLCMuchar?BusyC）
{
????if（BusyC）lcd_wait（）;
	DATAPORT=WCLCM;
????LCM_RS=0;???????????????????/*?選中指令寄存器*/
????LCM_RW=0;???????????????	//?寫模式
????LCM_EN=1;
	_nop_（）;
	_nop_（）;
	_nop_（）;
????LCM_EN=0;

}

/**********寫數據到LCD子函數************/

void?WriteDataLCM（uchar?WDLCM）
{
????lcd_wait（?）;????????????//檢測忙信號
	DATAPORT=WDLCM;
????LCM_RS=1;???????????????/*?選中數據寄存器??*/
????LCM_RW=0;???????????	//?寫模式
????LCM_EN=1;
????_nop_（）;
	_nop_（）;
	_nop_（）;
????LCM_EN=0;
}

/***********lcd內部等待函數*************/

void?lcd_wait（void）
{
????DATAPORT=0xff;	?????//讀LCD前若單片機輸出低電平而讀出LCD為高電平則沖突Proteus仿真會有顯示邏輯黃色
	LCM_EN=1;
????LCM_RS=0;
????LCM_RW=1;
????_nop_（）;
????_nop_（）;
	_nop_（）;
????while（DATAPORT&BUSY）
	{??LCM_EN=0;
	???_nop_（）;
	???_nop_（）;
	???LCM_EN=1;
	???_nop_（）;
	???_nop_（）;
	}
???	LCM_EN=0;

}

/**********LCD初始化子函數***********/
void?initLCM（?）
{
	DATAPORT=0;
	ddelay（15）;
	WriteCommandLCM（0x380）;????//三次顯示模式設置，不檢測忙信號
????ddelay（5）;
????WriteCommandLCM（0x380）;
????ddelay（5）;
????WriteCommandLCM（0x380）;
????ddelay（5）;

????WriteCommandLCM（0x381

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????91704??2008-12-03?10:24??Speed\Last?Loaded?speed.DBK

?????文件??????10647??2007-04-25?10:41??Speed\Speed

?????文件???????4123??2007-04-25?10:37??Speed\Speed.c

?????文件??????91704??2008-12-03?10:24??Speed\speed.DSN

?????文件???????3630??2007-04-25?10:41??Speed\Speed.hex

?????文件?????????27??2007-04-25?10:41??Speed\Speed.lnp

?????文件???????8746??2007-04-25?10:41??Speed\Speed.LST

?????文件??????14264??2007-04-25?10:41??Speed\Speed.M51

?????文件??????12068??2007-04-25?10:41??Speed\Speed.OBJ

?????文件???????1283??2008-12-03?10:24??Speed\Speed.Opt

?????文件????????176??2008-12-03?10:22??Speed\Speed.plg

?????文件???????1277??2008-12-03?10:24??Speed\speed.PWI

?????文件???????2132??2008-12-03?10:24??Speed\Speed.Uv2

????.......??????1157??2007-04-26?15:52??Speed\Speed_Opt.Bak

????.......??????2166??2007-04-24?16:42??Speed\Speed_Uv2.Bak

?????目錄??????????0??2008-12-03?10:24??Speed

-----------?---------??----------?-----??----

???????????????245104????????????????????16