chaoshengbo.zip_超声波测距

/*============================================================ //HC-SRO4 超声波测距模块 DEMO 程序 SMC1602A(16*2)模拟口线接线方式 连接线图: |DB0-----P0.0 | DB4-----P0.4 | RW-------P2.6 | |DB1-----P0.1 | DB5-----P0.5 | RS-------P2.5 | |DB2-----P0.2 | DB6-----P0.6 | E--------P2.7 | |DB3-----P0.3 | DB7-----P0.7 | VLCD接1K电阻到GND| --------------------------------------------------- 接线：模块TRIG接 P2.1 ECH0 接P2.2 [注:AT89x51使用12M或11.0592M晶振,实测使用11.0592M] =============================================================*/ #include <AT89x51.H> //器件配置文件 #include <intrins.h> #define RX P2_2 #define TX P2_1 #define LCM_RW P2_6 //定义LCD引脚 #define LCM_RS P2_5 #define LCM_E P2_7 #define LCM_Data P0 #define Key_Data P2_0 //定义Keyboard引脚 #define Key_CLK P3_2 #define Busy 0x80 //用于检测LCM状态字中的Busy标识 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; //显示用指针 unsigned int time=0; unsigned long S=0; bit flag =0; unsigned char disbuff[4] ={ 0,0,0,0,}; ////写数据 //void WriteDataLCM(unsigned char WDLCM) //{ // ReadStatusLCM(); //检测忙 // LCM_Data = WDLCM; // LCM_RS = 1; // LCM_RW = 0; // LCM_E = 0; //若晶振速度太高可以在这后加小的延时 // LCM_E = 0; //延时 // LCM_E = 1; //} // ////写指令 //void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测 //{ // if (BuysC) ReadStatusLCM(); //根据需要检测忙 // LCM_Data = WCLCM; // LCM_RS = 0; // LCM_RW = 0; // LCM_E = 0; // LCM_E = 0; // LCM_E = 1; //} // ////读数据 //unsigned char ReadDataLCM(void) //{ // LCM_RS = 1; // LCM_RW = 1; // LCM_E = 0; // LCM_E = 0; // LCM_E = 1; // return(LCM_Data); //} // ////读状态 //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); //检测忙信号 // return(LCM_Data); //} // //void LCMInit(void) //LCM初始化 //{ // LCM_Data = 0; // WriteCommandLCM(0x38,0); //三次显示模式设置，不检测忙信号 // Delay5Ms(); // WriteCommandLCM(0x38,0); // Delay5Ms(); // WriteCommandLCM(0x38,0); // Delay5Ms(); // // WriteCommandLCM(0x38,1); //显示模式设置,开始要求每次检测忙信号 // WriteCommandLCM(0x08,1); //关闭显示 // WriteCommandLCM(0x01,1); //显示清屏 // WriteCommandLCM(0x06,1); // 显示光标移动设置 // WriteCommandLCM(0x0F,1); // 显示开及光标设置 //} //按指定位置显示一个字符 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; //当要显示第二行时地址码+0x40; X |= 0x80; //算出指令码 WriteCommandLCM(X, 1); //发命令字 WriteDataLCM(DData); //发数据 } //按指定位置显示一串字符 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) //若到达字串尾则退出 { if (X <= 0xF) //X坐标应小于0xF { DisplayOneChar(X, Y, DData[ListLength]); //显示单个字符 ListLength++; X++; } } } //5ms延时 void Delay5Ms(void) { unsigned int TempCyc = 5552; while(TempCyc--); } //400ms延时 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; //算出来是CM if((S>=700)||flag==1) //超出测量范围显示“-” { flag=0; DisplayOneChar(0, 1, ASCII[11]); DisplayOneChar(1, 1, ASCII[10]); //显示点 DisplayOneChar(2, 1, ASCII[11]); DisplayOneChar(3, 1, ASCII[11]); DisplayOneChar(4, 1, ASCII[12]); //显示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]); //显示点 DisplayOneChar(2, 1, ASCII[disbuff[1]]); DisplayOneChar(3, 1, ASCII[disbuff[2]]); DisplayOneChar(4, 1, ASCII[12]); //显示M } } /********************************************************/ void zd0() interrupt 1 //T0中断用来计数器溢出,超过测距范围 { flag=1; //中断溢出标志 } /********************************************************/ void StartModule() //启动模块 { TX=1; //启动一次模块 _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(); //启动等待，等LCM讲入工作状态 LCMInit(); //LCM初始化 //Delay5Ms(); //延时片刻(可不要) //DisplayListChar(0, 0, mcustudio); //DisplayListChar(0, 1, email); //ReadDataLCM();//测试用句无意义 //for (TempCyc=0; TempCyc<10; TempCyc++) //Delay400Ms(); //延时 // DisplayListChar(0, 1, Cls); while(1) { TMOD=0x01; //设T0为方式1，GATE=1； TH0=0; TL0=0; ET0=1; //允许T0中断 EA=1; //开启总中断 while(1) { // //当RX为零时等待 StartModule(); while(!RX); TR0=1; //开启计数 while(RX); //当RX为1计数并等待 TR0=0; //关闭计数 Conut(); //计算 delayms(80); //80MS } } }