#include#include #define uchar unsigned char#define uint unsigned intvoid SYSCLK_Init (void);void PORT_Init (void); void StartModule() ;void display(unsigned char bai,unsigned char shi,unsigned char ge);void delay(unsigned int z);void timerinit();void delay(unsigned int z);void Timer_Count(void);unsigned int time=0;uchar i; uchar j;unsigned long S=0;unsigned char qian,bai,shi,ge;bit flag =0;sbit lcdrs=P2^5;sbit lcden=P2^7;sbit lcdwr=P2^6;sbit RX = P0^1;sbit TX = P0^0;uchar abc[]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; //1234567;uchar result[3];void delay(void){ int a=10000; while(a!=0) { a--; }}void write_com(uchar com){ lcdrs=0; P3=com; delay(); lcden=1; delay(); lcden=0;}void write_date(uchar dat){ lcdrs=1; P3=dat; delay(); lcden=1; delay(); lcden=0;}void init(){ lcdwr=0; lcden=0; write_com(0x38); write_com(0x0c); write_com(0x06); write_com(0x01);}void main(){ unsigned int valA; WDTCN = 0xde; WDTCN = 0xad; timerinit(); SYSCLK_Init (); PORT_Init (); init(); lcdrs=0; lcdwr=0; write_com(0x40);while(1){ RX=1;StartModule(); for(valA=100;valA>0;valA--){ if(RX==1) { Timer_Count(); }}}} void SYSCLK_Init (void){ OSCICN = 0x05; } void PORT_Init (void){ XBR0 = 0x04; // Enable UART0 XBR1 = 0x00; XBR2 = 0x40; // Enable crossbar and weak pull-ups P0MDOUT |= 0xff; // enable TX0 as a push-pull output P2MDOUT = 0xe0; // P2口设为推挽方式 P3MDOUT = 0xff; // P2口设为推挽方式 }void Conut(void) { time=TH0*256+TL0; TH0=0; TL0=0; S=(uint)(time*1.7*1.6*1.5)/10; //算出来是MM if((S>=7000)||flag==1) //超出测量范围显示“-” { flag=0; display(0x80,0x80,0x80); } else { bai=S/100; shi=S%100/10; ge=S%10; display(bai,shi,ge); } }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 RX=0; }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 Timer_Count(void){ 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}void timerinit(){ 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 }/*********************************************************/void display(unsigned char bai,unsigned char shi,unsigned char ge){ uchar i; result[0]=abc[bai]; result[1]=abc[shi]; result[2]=abc[ge]; write_com(0x40); for(i=0;i<3;i++) { write_com(0x80+i+1); write_date(result[i]) ; }}
-电子元器件采购网（www.ruidan.com）是本土元器件目录分销商，采用“小批量、现货、样品”销售模式，致力于满足客户多型号、高质量、快速交付的采购需求。 自建高效智能仓储，拥有自营库存超过50,000种，提供一站式正品现货采购、个性化解决方案、选型替代等多元化服务。
