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用以下程序做的超聲波測(cè)距1602不能實(shí)時(shí)顯示距離，顯示的距離永遠(yuǎn)是第一次次測(cè)量的距離，求解
#include <AT89x51.H>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
#define RX P2_6
#define TX P2_7
#define LCM_RW P0_2
#define LCM_RS P0_1
#define LCM_E P0_3
#define LCM_Data P1
#define Busy 0x80
unsigned char code mcustudio[] ={" DONGMUFORYOU "};
unsigned char code Cls[] = {" "};
unsigned char code ASCII[15] = {'0','1','2','3','4','5','6','7','8','9','.','-','M'};
static unsigned char DisNum = 0;
uint time=0;
unsigned long S=0;
bit flag =0;
uchar disbuff[4]={ 0,0,0,0,};
/*********************5ms延時(shí)************/
void delay5Ms(void)
{
uint TempCyc = 5552;
while(TempCyc--);
}
/***********400ms延時(shí)******************/
void delay400Ms(void)
{
uchar TempCycA = 5;
uint TempCycB;
while(TempCycA--)
{
TempCycB=7269;
while(TempCycB--);
};
}
/*********************延遲****************/
void delayms(uint ms)
{
unsigned char i=100,j;
for(;ms;ms--)
{
while(--i)
{
j=10;
while(--j);
}
}
}
/**************讀狀態(tài)**********************************/
uchar readStatusLCM(void)
{
LCM_Data = 0xFF;
LCM_RS = 0;
LCM_RW = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
while(LCM_Data & Busy); //檢測(cè)忙信號(hào)
return(LCM_Data);
}
/*****************讀數(shù)據(jù)***************************************/
/*uchar readDataLCM(void)
{
LCM_RS = 1;
LCM_RW = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
return(LCM_Data);
} */
/******************寫(xiě)數(shù)據(jù)*********************************/
void writeDataLCM(uchar WDLCM)
{
readStatusLCM(); //檢測(cè)忙
LCM_Data = WDLCM;
LCM_RS = 1;
LCM_RW = 0;
LCM_E = 0; //若晶振速度太高可以在這后加小的延時(shí)
LCM_E = 0; //延時(shí)
LCM_E = 1;
}
/*****************寫(xiě)指令*********************************/
void writeCommandLCM(unsigned char WCLCM,BuysC) //BuysC為0時(shí)忽略忙檢測(cè)
{
if (BuysC)
readStatusLCM(); //根據(jù)需要檢測(cè)忙
LCM_Data = WCLCM;
LCM_RS = 0;
LCM_RW = 0;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
}
/*************初始化*************************************/
void LCMInit(void) //LCM初始化
{
writeCommandLCM(0x38,0); //顯示模式設(shè)置，不檢測(cè)忙信號(hào)
delay5Ms();
writeCommandLCM(0x38,1); //顯示模式設(shè)置,開(kāi)始要求每次檢測(cè)忙信號(hào)
writeCommandLCM(0x08,1); //關(guān)閉顯示
writeCommandLCM(0x01,1); //顯示清屏
writeCommandLCM(0x06,1); // 顯示光標(biāo)移動(dòng)設(shè)置
writeCommandLCM(0x0c,1); // 顯示關(guān)及光標(biāo)設(shè)置
}
//按指定位置顯示一個(gè)字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
Y &= 0x1;
X &= 0xF; //限制X不能大于15，Y不能大于1
if (Y)
{
X |= 0x40; //當(dāng)要顯示第二行時(shí)地址碼+0x40;
}
X |= 0x80; //算出指令碼
writeCommandLCM(X, 1); //發(fā)命令字
writeDataLCM(DData); //發(fā)數(shù)據(jù)
}
/**************顯示字符*************************************/
//按指定位置顯示一串字符
void displayListChar(uchar X, uchar Y, uchar code *DData)
{
uchar ListLength;
ListLength = 0;
Y &= 0x1;
X &= 0xF; //限制X不能大于15，Y不能大于1
while (DData[ListLength]>0x19) //若到達(dá)字串尾則退出
{
if (X <= 0xF) //X坐標(biāo)應(yīng)小于0xF
{
DisplayOneChar(X, Y, DData[ListLength]); //顯示單個(gè)字符
ListLength++;
X++;
}
}
}
/************計(jì)數(shù)*****************************/
void count(void)
{
time=TH0*256+TL0;
TH0=0;
TL0=0;
S=(time*1.7)/100; //算出來(lái)是CM
if((S>=700)||flag==1) //當(dāng)距離超出測(cè)量時(shí)，范圍顯示“-”
{
flag=0;
DisplayOneChar(0, 1, ASCII[11]);
DisplayOneChar(1, 1, ASCII[10]); //顯示點(diǎn)
DisplayOneChar(2, 1, ASCII[11]);
DisplayOneChar(3, 1, ASCII[11]);
DisplayOneChar(4, 1, ASCII[12]); //顯示M
}
else //當(dāng)距離未超出距離限制時(shí)，正常顯示
{
disbuff[0]=S%1000/100;
disbuff[1]=S%1000%100/10;
disbuff[2]=S%1000%10 %10;
DisplayOneChar(4, 1, ASCII[disbuff[0]]);
DisplayOneChar(5, 1, ASCII[10]); //顯示點(diǎn)
DisplayOneChar(6, 1, ASCII[disbuff[1]]);
DisplayOneChar(7, 1, ASCII[disbuff[2]]);
DisplayOneChar(8, 1, ASCII[12]); //顯示M
}
}
/*************************中斷**************************/
void timer0() interrupt 1 //T0中斷用來(lái)計(jì)數(shù)器溢出,超過(guò)測(cè)距范圍
{
flag=1; //中斷溢出標(biāo)志
}
/******************啟動(dòng)模塊*********************************/
void startModule() //啟動(dòng)模塊
{
uchar i;
TX=1; //啟動(dòng)一次模塊
for(i=0;i<20;i++) //延遲 以便于進(jìn)行傳送數(shù)據(jù)
{
_nop_();
}
TX=0;
}
/*****************主函數(shù)***********************************/
void main()
{
LCMInit(); //LCM初始化
delay5Ms(); //延時(shí)片刻(可不要)
displayListChar(0, 0, mcustudio);
displayListChar(0, 1, Cls);
TMOD=0x01; //設(shè)T0為方式1，GATE=1；
TH0=0;
TL0=0;
ET0=1; //允許T0中斷
EA=1; //開(kāi)啟總中斷
while(1)
{
startModule();
while(!RX); //當(dāng)RX為零時(shí)等待
TR0=1; //開(kāi)啟計(jì)數(shù)
while(RX); //當(dāng)RX為1計(jì)數(shù)并等待
TR0=0; //關(guān)閉計(jì)數(shù)
count(); //計(jì)算
delayms(80); //80MS
}
大神們求解！急急急 |
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