1602和HC-SR04超声波模块测距C语言程序.doc

#define uchar unsigned char #define uint unsigned int /************************** Trig超声波传感器控制端， Echo超声波传感器接收端。 ***************************/ sbit Trig=P2^4; sbit Echo=P3^2; /************************** lcd_rs为1602液晶数据命令选择， lcd_en为1602液晶使能端，lcd_rw 为1602液晶读写控制端。 ***************************/ sbit lcd_rs=P2^5; sbit lcd_rw=P2^6; sbit lcd_en=P2^7; #includereg52.h #includeintrins.h #includeZNCCSB1.h void init(); //函数初始化 void LCD_init(); //LCD的初始化 void LCD_write_date(uchar date); //lcd的写数据函数 void LCD_write_com(uchar com); //lcd的写指令函数 void delay(uint); //延时函数 void dev_delay(); //读写延时函数 void distance_display(); //lcd的显示函数 uchar code num[] ={0,1,2,3,4,5,6,7,8,9,m}; uchar code warning[]={Measurement error!}; uchar T0_cout,display_flag; uint T0_time; void main() { delay(1500); init(); while(1) { Trig=1; delay(20); Trig=0; while(Echo==0); TR0=1; while(Echo==1); //TR0=0; while(display_flag==0); while(display_flag==1) { display_flag=0; LCD_init(); distance_display(); delay(1500); } } } void dev_delay() { _nop_(); _nop_(); _nop_(); _nop_(); } void delay(uint time) { uchar x; uint y; for(y=time;y0;y--) for(x=220;x0;x--); } void LCD_write_com(uchar com) { lcd_en=0; lcd_rs=0; lcd_rw=0; P0=com; dev_delay(); lcd_en=1; delay(1); lcd_en=0; dev_delay(); } void LCD_write_date(uchar date) { lcd_rs=1; lcd_rw=0; lcd_en=0; P0=date; dev_delay(); lcd_en=1; delay(1); lcd_en=0; dev_delay(); } void LCD_init() { LCD_write_com(0x38); LCD_write_com(0x0c); LCD_write_com(0x06); LCD_write_com(0x01); } void init() { LCD_init(); TMOD=0x01; TH0=0; TL0=0; EA=1; //总中