#include<reg52.h>
#include<stdio.h>
#define __nop()__asm nop__endasm
#define TRIGGER P0_O
#define ECHO P0_1
void delay()
{
unsigned long int i;
for(i=0;i<10000;i++);
}
int puchar (int c)
{
while (!(SCON & 0x02));
SCON &= -0x02;
SBUF = c;
return(c);
}
void trigger()
{
TRIGGER = 0;
TRIGGER = 1;
__nop();__nop();__nop();__nop();
__nop();__nop();__nop();__nop();
__nop();__nop();__nop();__nop();
__nop();__nop();__nop();__nop();
TRIGGER = 0;
}
void calc()
{
unsigned int duration,distance;
duration = TH0*256 + TL0;
duration *=12/11.0592;
distance = duration * 0.017;
printf("distance:%dcm\n",distance);
TH0 = 0;
TL0 = 0;
}
void setup()
{
TMOD = 0x21;
SCON = 0x40;
TH1 = 0xFD;
TCON = 0x40;
SCON = 0x02;
TH0 = 0;
TL0 = 0;
ETO = 1;
EA = 1;
}
void loop()
{
triiger();
while(!ECHO);
TR0 = 1;
while (ECHO);
TR0 = 0;
calc();
delay();
}
void main(void);
{
setup();
while (1)loop();
}
Part_08.c(24): error C202: 'P0_O': undefined identifier
Part_08.c(25): error C202: 'P0_O': undefined identifier
Part_08.c(30): error C202: 'P0_O': undefined identifier
Part_08.c(54): error C202: 'ETO': undefined identifier
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