chaoshengbo.rar_chaoshengbo_超声波测距

#include<reg51.h> #define uchar unsigned char #define uint unsigned int #define ulong unsigned long extern void cs_t(void); extern void delay(uint); extern void display(uchar *); data uchar testok; /*主程序*/ void main(void) { data uchar dispram[5]; data uint i; data ulong time; P0=0xff; P2=0xff; TMOD=0x11; IE=0x80; while(1) { cs_t(); delay(1); testok=0; EX0=1; ET0=1; while(! testok) display(dispram); if(1==testok) { time=TH0; time=(time<<8) | TL0; time*=172; time/=10000; dispram[0]=(uchar)(time%10); time/=10; dispram[1]=(uchar)(time%10); time/=10; dispram[2]=(uchar)(time%10); dispram[3]=(uchar)(time/10); if(0==dispram[3])dispram[3]=17; }else { dispram[0]=16; dispram[1]=16; dispram[2]=16; dispram[3]=16; } for(i=0;i<300;i++)display(dispram); } } /*超声波接收程序（外中断0）*/ void cs_r(void) interrupt 0 { TR0=0; ET0=0; EX0=0; testok=1; } /*超时清除程序(内中断0)*/ void overtime(void) interrupt 1 { EX0=0; TR0=0; ET0=0; testok=2; } /*文件2:cs_t.asm*/ /*超声波发生子程序*/ NAME; CS_T ;?PR?CS_T?CS_T SEGMENT CODE PUBLIC CS_T RSEG ?PR?CS_T?CS_T CS_T: PUSH ACC MOV TH0,#00H MOV TL0,#00H MOV A,#4D SETB TR0 CS_T1: CPL P1.0 NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP DJNZ ACC,CS_T1 POP ACC RET END /*文件3:display.asm*/ /*4位共阳LED动态扫描显示程序*/ NAME DISPLAY ?PR?_DISPLAY?DISPLAY SEGMENT CODE ?CO?_DISPLAY?DISPLAY SEGMENT DATA EXTRN CODE(_DELAY) PUBLIC _DISPLAY RSEG ?CO?_DISPLAY?DISPLAY ?_DISPLAY?BYTE: DISPBIT: DS 1 DISPNUM: DS 1 RSEG ?PR?_DISPLAY?DISPLAY _DISPLAY: PUSH ACC PUSH DPH PUSH DPL PUSH PSW INC DISPNUM MOV A,DISPNUM CJNE A,#4D,DISP1 DISP1: JC DISP2 MOV DISPNUM,#00H MOV DISPBIT,#0FEH DISP2: MOV A,R1 ADD A,DISPNUM MOV R0,A MOV A,@R0 MOV DPTR,#DISPTABLE MOVC A,@A+DPTR MOV P0,A MOV A,DISPNUM CJNE A,#2D,DISP3 CLR P0.7 DISP3: MOV P2,DISPBIT MOV R6,#00H MOV R7,#0AH LCALL _DELAY MOV P0,#0FFH MOV P2,#0FFH MOV A,DISPBIT RL A MOV DISPBIT,A POP PSW POP DPL POP DPH POP ACC RET DISPTABLE: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H,88H,83H,0C6H,0A1H,86H,8EH,0BFH,0FFH END /*文件4:delay.asm*/ /*延时100个机器周期*/ NAME DELAY ?PR?_DELAY?DELAY SEGMENT CODE PUBLIC _DELAY RSEG ?PR?_DELAY?DELAY _DELAY: PUSH ACC ;2 MOV A,R7 ;1 JZ DELA1 ;2 INC R6 ;1 DELA1: MOV R5,#50D ;2 DJNZ R5,$ ;2 DJNZ R7,DELA1 ;2 DJNZ R6,DELA1 ;2 POP ACC ;2 RET ;2 END