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標題: 超聲測距1602顯示 [打印本頁]

作者: 單片機助手 時間: 2018-8-31 19:30
標題: 超聲測距1602顯示
#include <AT89x51.H> //器件配置文件
#include <intrins.h>
#define  RX  P2_7
#define  TX  P2_6

#define LCM_RW  P3_4 //定義LCD引腳
#define LCM_RS  P3_3
#define LCM_E P3_5
#define LCM_Data  P1

#define Key_Data P2_0 //定義Keyboard引腳
#define Key_CLK  P3_2

#define Busy 0x80 //用于檢測LCM狀態字中的Busy標識

void LCMInit(void);
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
void Delay5Ms(void);
void Delay400Ms(void);
void Decode(unsigned char ScanCode);
void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM,BuysC);

unsigned char ReadDataLCM(void);
unsigned char ReadStatusLCM(void);
unsigned char code mcustudio[] ={"mcustudio.com.cn"};
unsigned char code email[] = {"fhwxaoo@163.com "};
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; //顯示用指針
   unsigned int  time=0;
   unsigned long S=0;
   bit    flag =0;
   unsigned char disbuff[4]    ={ 0,0,0,0,};

//寫數據
void WriteDataLCM(unsigned char WDLCM)
{
ReadStatusLCM(); //檢測忙
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
LCM_E = 0; //延時
LCM_E = 1;
}

//寫指令
void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC為0時忽略忙檢測
{
if (BuysC) ReadStatusLCM(); //根據需要檢測忙
LCM_Data = WCLCM;
LCM_RS = 0;
LCM_RW = 0;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
}

//讀數據
unsigned char ReadDataLCM(void)
{
LCM_RS = 1;
LCM_RW = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
return(LCM_Data);
}

//讀狀態
unsigned char ReadStatusLCM(void)
{
LCM_Data = 0xFF;
LCM_RS = 0;
LCM_RW = 1;
LCM_E = 0;
LCM_E = 0;
LCM_E = 1;
while (LCM_Data & Busy); //檢測忙信號
return(LCM_Data);
}

void LCMInit(void) //LCM初始化
{
LCM_Data = 0;
WriteCommandLCM(0x38,0); //三次顯示模式設置，不檢測忙信號
Delay5Ms();
WriteCommandLCM(0x38,0);
Delay5Ms();
WriteCommandLCM(0x38,0);
Delay5Ms();

WriteCommandLCM(0x38,1); //顯示模式設置,開始要求每次檢測忙信號
WriteCommandLCM(0x08,1); //關閉顯示
WriteCommandLCM(0x01,1); //顯示清屏
WriteCommandLCM(0x06,1); // 顯示光標移動設置
WriteCommandLCM(0x0F,1); // 顯示開及光標設置
}

//按指定位置顯示一個字符
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; //當要顯示第二行時地址碼+0x40;
X |= 0x80; //算出指令碼
WriteCommandLCM(X, 1); //發命令字
WriteDataLCM(DData); //發數據
}

//按指定位置顯示一串字符
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData)
{
unsigned char 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) //若到達字串尾則退出
{
if (X <= 0xF) //X坐標應小于0xF
{
DisplayOneChar(X, Y, DData[ListLength]); //顯示單個字符
ListLength++;
X++;
}
}
}

//5ms延時
void Delay5Ms(void)
{
unsigned int TempCyc = 5552;
while(TempCyc--);
}

//400ms延時
void Delay400Ms(void)
{
unsigned char TempCycA = 5;
unsigned int TempCycB;
while(TempCycA--)
{
TempCycB=7269;
while(TempCycB--);
};
}
/********************************************************/
void Conut(void)
{
   time=TH0*256+TL0;
   TH0=0;
   TL0=0;

   S=(time*1.7)/100;    //算出來是CM
   if((S>=700)||flag==1) //超出測量范圍顯示“-”
   {
   flag=0;

   DisplayOneChar(0, 1, ASCII[11]);
   DisplayOneChar(1, 1, ASCII[10]); //顯示點
   DisplayOneChar(2, 1, ASCII[11]);
   DisplayOneChar(3, 1, ASCII[11]);
   DisplayOneChar(4, 1, ASCII[12]); //顯示M
   }
   else
   {
   disbuff[0]=S%1000/100;
   disbuff[1]=S%1000%100/10;
   disbuff[2]=S%1000%10 %10;
   DisplayOneChar(0, 1, ASCII[disbuff[0]]);
   DisplayOneChar(1, 1, ASCII[10]); //顯示點
   DisplayOneChar(2, 1, ASCII[disbuff[1]]);
   DisplayOneChar(3, 1, ASCII[disbuff[2]]);
   DisplayOneChar(4, 1, ASCII[12]); //顯示M
   }
}
/********************************************************/
   void zd0() interrupt 1    //T0中斷用來計數器溢出,超過測距范圍
  {
flag=1;    //中斷溢出標志
  }
/********************************************************/
   void  StartModule()          //啟動模塊
  {
   TX=1;                      //啟動一次模塊
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   _nop_();
   TX=0;
  }
/********************************************************/
void delayms(unsigned int ms)
{
unsigned char i=100,j;
for(;ms;ms--)
{
while(--i)
{
j=10;
while(--j);
}
}
}
/*********************************************************/
void main(void)
{
unsigned char TempCyc;
Delay400Ms(); //啟動等待，等LCM講入工作狀態
LCMInit(); //LCM初始化
Delay5Ms(); //延時片刻(可不要)
DisplayListChar(0, 0, mcustudio);
DisplayListChar(0, 1, email);
ReadDataLCM();//測試用句無意義
for (TempCyc=0; TempCyc<10; TempCyc++)
Delay400Ms(); //延時
DisplayListChar(0, 1, Cls);
while(1)
{
   TMOD=0x01;    //設T0為方式1，GATE=1；
   TH0=0;
   TL0=0;
   ET0=1;          //允許T0中斷
   EA=1;    //開啟總中斷

while(1)
   {
      StartModule();
// DisplayOneChar(0, 1, ASCII[0]);
      while(!RX); //當RX為零時等待
      TR0=1;       //開啟計數
      while(RX); //當RX為1計數并等待
      TR0=0; //關閉計數
      Conut(); //計算
   delayms(80); //80MS

   }
}
}

作者: admin 時間: 2018-9-1 04:06
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