#include?“reg51.h“
#include?“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(shí)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(shí)計(jì)數(shù)器1?*/
{
???TH0?=0x3c;
???TL0?=0xaf;
???count++;
}

void?main（void）
{
???	TMOD=0x01;???????????????????????/*TMOD?T0選用方式1（16位定時(shí)）?*/
????IP|=0x01;???????????????????????????/*INT0?中斷優(yōu)先*/
????TCON|=0x11;?????????????????????????/*TCON??EX0下降沿觸發(fā)啟動(dòng)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(xiě)指令到LCD子函數(shù)************/

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(xiě)模式
????LCM_EN=1;
	_nop_（）;
	_nop_（）;
	_nop_（）;
????LCM_EN=0;

}

/**********寫(xiě)數(shù)據(jù)到LCD子函數(shù)************/

void?WriteDataLCM（uchar?WDLCM）
{
????lcd_wait（?）;????????????//檢測(cè)忙信號(hào)
	DATAPORT=WDLCM;
????LCM_RS=1;???????????????/*?選中數(shù)據(jù)寄存器??*/
????LCM_RW=0;???????????	//?寫(xiě)模式
????LCM_EN=1;
????_nop_（）;
	_nop_（）;
	_nop_（）;
????LCM_EN=0;
}

/***********lcd內(nèi)部等待函數(shù)*************/

void?lcd_wait（void）
{
????DATAPORT=0xff;	?????//讀LCD前若單片機(jī)輸出低電平而讀出LCD為高電平則沖突Proteus仿真會(huì)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(shù)***********/
void?initLCM（?）
{
	DATAPORT=0;
	ddelay（15）;
	WriteCommandLCM（0x380）;????//三次顯示模式設(shè)置，不檢測(cè)忙信號(hào)
????ddelay（5）;
????WriteCommandLCM（0x380）;
????ddelay（5）;
????WriteCommandLCM（0x380）;
????ddelay（5）;

????WriteCommandLCM（0x381）;????//8bit數(shù)據(jù)

?屬性????????????大小?????日期????時(shí)間???名稱(chēng)
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?????文件??????90307??2009-03-19?14:48??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\Last?Loaded?測(cè)速儀.DBK

?????文件???????3630??2007-04-25?10:41??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\Speed.hex

?????文件???????2146??2009-03-25?00:22??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\數(shù)字測(cè)速儀

?????文件???????3578??2009-03-25?00:22??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\數(shù)字測(cè)速儀.hex

?????文件?????????78??2009-03-25?00:22??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\數(shù)字測(cè)速儀.lnp

?????文件???????6004??2009-03-25?00:22??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\數(shù)字測(cè)速儀.M51

?????文件???????1067??2009-03-25?00:22??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\數(shù)字測(cè)速儀.Opt

?????文件????????421??2009-03-25?00:22??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\數(shù)字測(cè)速儀.plg

?????文件???????2062??2009-03-25?00:22??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\數(shù)字測(cè)速儀.Uv2

?????文件??????????0??2009-03-25?00:21??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\數(shù)字測(cè)速儀_Uv2.Bak

?????文件??????90394??2009-03-19?14:56??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\測(cè)速儀.DSN

?????文件????????742??2010-05-15?10:22??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\測(cè)速儀.PWI

?????文件???????4109??2009-03-19?14:46??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\項(xiàng)目30?基于單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì).c

?????文件????????781??2009-03-25?00:22??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\項(xiàng)目30?基于單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì).LST

?????文件???????3907??2009-03-25?00:22??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)\項(xiàng)目30?基于單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì).OBJ

?????目錄??????????0??2011-06-23?19:27??項(xiàng)目30?基于AT89S52單片機(jī)LCD數(shù)字測(cè)速儀的設(shè)計(jì)

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???????????????209226????????????????????16