超声波测距C语言源程序代码.docx

1、/*HZ即单位s的倒数本晶振为12MHZ,因此外部的时钟频率为12MHZ,所以内部的时钟频率为(12MHZ)/12=1MH即1000000HZ,而机械频率为1/(1MHZ),即每完成一次计算(即定时器的值加一)用时0.000001s,即1us(微秒).*/*/具有模式选择.#include#define UC unsigned char#define UI unsigned intvoid delay(UI);/延时9.56us程序sbit beep = P13;/用于声音报警sbit Lv = P17;/用于光报警sbit Hong = P16;sbit QD = P37;/K8 /P37口

2、(K8)为确定键,sbit GX = P31;/K7/P33口(K2)为修改键,sbit SX = P36;/K6/P32(K3)为测量键.sbit BX = P30;/K5/个(K7),十(K6),百(K5),三位修改键sbit a = P12;/百位/数码管位选sbit b = P11;/十位sbit c = P10;/个位sbit trig = P14;/方波发射端sbit echo = P15;/超声波接收端void IntConfiguration();/用来设置中断的函数,P33口(K2)为修改键,P32(K3)为测量键.void TimeConfiguration();/用来设置

3、定时器的函数sbit K1 = P34;/动态sbit K4 = P35;/静态/用于进行模式切换(K1、K4键)void xiaxian();/修改函数,用来修改下限void shangxian();/修改函数,用来修改上限UI min3=0,5,0;/报警极限,拆分为百十个三位UI max3=3,0,0;/MIN,MAX 用来存储最大和最小值void MINxianshi(UI);/最小范围和最大范围的显示void MAXxianshi(UI);UC code CharacterCode10 = 0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x

4、6f;/数码管数字字符(P2口)/*主函数*/void main()TimeConfiguration();/设置定时器0IntConfiguration();/设置中断允许,K4键为修改键,K8键为确定键while(1)MINxianshi(40);/1.50169000sMAXxianshi(40);/1.50098300s/*超声波测距函数*/void zhongduan_0() interrupt 0/测量中断函数(外部中断0)UI moshi = 0; UI juli = 0; UI time = 0; UI MAX, MIN; UI TT = 0;/用于第一次测量时给P15口置一,

5、以便正确读取数值UI t1, t2, t3; UI GE = 0, SHI = 0, BAI = 0;/先定义三个变量,用来显示测量的距离.a = 0;b = 0;c = 0; P2 = 0x00;/防止最后显示的那个数码管一直亮MAX = max0*100 + max1*10 + max2;/计算最大与最小值MIN = min0*100 + min1*10 + min2;while(1)/下面进行测量while(1)/*先进行模式判断*/if(0 = K1)moshi = 1;break;/模式1为动态测量if(0 = K4)moshi = 2;break;/模式2为静态测量if(0 = Q

6、D)return;/结束测量函数/*计算距离*/loop:beep = 1;/关掉定时器Lv = 1;Hong = 1;/关掉灯a = 0; b = 0; c = 0;P2 = 0x00;/防止最后显示的那个数码管一直亮if( (0 = QD)&(1 = moshi) )break;if( (0 = QD)&(2 = moshi) )delay(55500);if(0 = QD)delay(55500);if(0 = QD)break;t1 = 35, t2 = 35; t3 = 35;trig = 0; echo = 0; delay(2);/初始化拉低两个端口trig = 1; delay

7、(2); trig = 0;/输出端输出27us的高电压,并将输出端口拉低while(echo = 0);/判断是否有回波返回,有则开启定时器TR0 = 1;/当有高电平输出时,开启定时器while(echo = 1);TR0 = 0;/当高电平变成低电平时,关闭定时器+TT;/测量值加一,记录测量次数if(1 = TT)delay(55500);TH0 = 0x00;TL0 = 0x00;/定时器的初值,定时器的定时为65536us.goto loop;time = TL0 + TH0*256;/接下来显示测量的距离TH0 = 0x00;TL0 = 0x00;/定时器的初值,定时器的定时为6

8、5536us.juli = ( int )( (time*0.034)/2 );BAI = ( (juli%1000)/100 );SHI = ( (juli%100)/10 ); GE = ( juli%10 );/*两种模式的距离显示*/if(juli MAX)Hong = 0;Lv = 1;while( t1- )a = 0; b = 1; c = 1; P2 = CharacterCodeBAI; delay(400);a = 1; b = 0; c = 1; P2 = CharacterCodeSHI; delay(400);a = 1; b = 1; c = 0; P2 = Cha

9、racterCodeGE; delay(390);beep = 0;if( (1 = moshi)&(0 = t1) )goto loop;if(moshi = 2)t1 = 2;if(0 = QD)goto loop;else if(juli MIN)Lv = 0;Hong = 1;while( t2- )a = 0; b = 1; c = 1; P2 = CharacterCodeBAI; delay(500);a = 1; b = 0; c = 1; P2 = CharacterCodeSHI; delay(500);a = 1; b = 1; c = 0; P2 = Character

10、CodeGE; delay(400);beep = 0;delay(100);beep = 1;if( (1 = moshi)&(0 = t2) )goto loop;if(2 = moshi)t2 = 2;if(0 = QD)goto loop;elsebeep = 1;Lv = 1;Hong = 1;while( t3- )a = 0; b = 1; c = 1;P2 = CharacterCodeBAI;delay(600);a = 1; b = 0; c = 1;P2 = CharacterCodeSHI;delay(600);a = 1; b = 1; c = 0;P2 = Char

11、acterCodeGE; delay(600);if( (1 = moshi)&(0 = t3) )goto loop;if(2 = moshi) t3 = 2;if(0 = QD)goto loop;/显示结束/*/void zhongduan_1() interrupt 1/定时器溢出时的中断,显示测得的距离(定时器中断0)TH0 = 0x00;/定时器的初值,定时器的定时为65536us,TL0 = 0x00;/*/void zhongduan_2() interrupt 2/修改键(K4)的中断函数(外部中断1)xiaxian();while(QD=0);shangxian();/*/

12、void MINxianshi(UI TT)/显示最小距离while(TT-)a = 0; b = 1; c = 1;P2 = CharacterCodemin0;delay(500);a = 1; b = 0; c = 1;P2 = CharacterCodemin1;delay(500);a = 1; b = 1; c = 0;P2 = CharacterCodemin2;delay(500);P2 = 0x00;delay(55500);void MAXxianshi(UI TT)/显示最大距离while(TT-)a = 0; b = 1; c = 1;P2 = CharacterCod

13、emax0;delay(500);a = 1; b = 0; c = 1;P2 = CharacterCodemax1;delay(500);a = 1; b = 1; c = 0;P2 = CharacterCodemax2;delay(500);P2 = 0x00;delay(55500);/*/void delay(UI T)/延时程序while(T-);/*/void IntConfiguration()/设置中断函数/优先级设置PT2 = 0; PS = 0; PT1 = 0; PX1 = 0; PT0 = 1; PX0 = 0;IT1 = 1;/外部中断0为跳变沿触发EX1 = 1

14、;/P33口(K4键)修改键,中断允许开启IT0 = 1;/外部中断1为跳变沿触发EX0 = 1;/P32口(K1键)测量键,中断允许开启ET0 = 1;/定时器0的中断允许开启EA = 1;void TimeConfiguration()/设置定时器,以及定时器的初值TMOD = 0x01;/设定只使用0号定时器; 模式:定时器; 工作方式:1号工作方式./下面是定时器的初始值, TR0,TR1是用来开启定时器的TH0 = 0x00;/定时器的初值,定时器的定时为50us.TL0 = 0x00;/*1号定时器不用,所以没有TH1,TL1*/*/void xiaxian()/修改下限while

15、(1)if(BX=0)/百位P2=0x00;min0+;if(min0=10)min0=0;delay(60000);a = 0; b = 1; c = 1;P2 = CharacterCodemin0;delay(100);if(SX=0)/十位P2=0x00;min1+;if(min1=10)min1=0;delay(60000);a = 1; b = 0; c = 1;P2 = CharacterCodemin1;delay(100);if(GX=0)/个位P2=0x00;min2+;if(min2=10)min2=0;delay(60000);a = 1; b = 1; c = 0;P

16、2 = CharacterCodemin2;delay(100);if(QD=0)a = 0;b = 0;c = 0;P2 = 0xff;break;void shangxian()/修改上限while(1)if(BX=0)/百位P2=0x00;max0+;if(max0=10)max0=0;delay(60000);a = 0; b = 1; c = 1;P2 = CharacterCodemax0;delay(100);if(SX=0)/十位P2=0x00;max1+;if(max1=10)max1=0;delay(60000);a = 1; b = 0; c = 1;P2 = CharacterCodemax1;delay(100);if(GX=0)/个位P2=0x00;max2+;if(max2=10)max2=0;delay(60000);a = 1; b = 1; c = 0;P2 = CharacterCodemax2;delay(100);if(QD = 0)a = 0;b = 0;c = 0;P2 = 0xff;while(QD = 0);break;/*/