error C202: ‘P0_O’: undefined identifier怎么改啊

error C202: ‘P0_O’: undefined identifier怎么改啊,#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

,#define TRIGGER P0_O，这句机器读不懂 ,#define TRIGGER,这句你确定是“O”，而不是“0”？
应该是 P0_0或P0^0吧？,ETO还是错的，应是ET0,
#define TRIGGER P0_O
#define ECHO P0_1