超声波测距1602显示

/* * *

/* * /******************************************************************

LCD1602 模拟口线接

--------------------------------------------------- |LCM-----51 | LCM-----51 | LCM------51 | --------------------------------------------------|

|DB0-----P0.0 | DB4-----P0.4 | RS-------P1.0 | |DB1-----P0.1 | DB5-----P0.5 | RW-------P1.1 | |DB2-----P0.2 | DB6-----P0.6 | E--------P2.5 | |DB3-----P0.3 | DB7-----P0.7 | | --------------------------------------------------- 接线：模块TRIG接 P1.6 ECH0 接P1.7

[使用12M或11.0592M晶振,实测使用11.0592M]

=============================================================*/ #include //器件配置文件 #include sbit RX = P1^7; sbit TX = P1^6;

sbit LCM_RS = P2^2; //定义LCD引脚 sbit LCM_RW = P2^1; sbit LCM_E = P2^0; #define LCM_Data P0

#define Busy 0x80 //用于检测LCM状态字中的Busy标识 sbit kg=P2^6; sbit kg1=P2^7;

sbit RST=P2^4; //时钟 加上后可以关掉DS1302芯片输出 sbit Sda=P2^0; //定义总线连接端口 sbit Scl=P2^1;

sbit dula=P2^6; sbit wela=P2^7; 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[] ={\"SUMCU Elec Tech\unsigned char code email[] = {\"SUMCU.taobao.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(0x0c,1); // 显示开及光标设置 kg=0; kg1=0; P0=0xff;

kg=1; kg1=1; }

//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 cmg(void)//数码管锁存函数 关时钟DS1302 {

dula=1; P0=0x00;

dula=0; wela=1; P0=0x00; wela=0; RST=0; // 关时钟DS1302 }

/*********************************************************/ 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) { cmg(); 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) { StartModule(); // DisplayOneChar(0, 1, ASCII[0]); while(!RX); //当RX为零时等待 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 } }

}