xsj_liudong_car.c

基于89c2051开发的ptr8000一对多无线通信程序.

#include <reg51.h>
#include <absacc.h> 
#include <stdio.h>
unsigned char TLV=0x00;
unsigned char THV=0xe7;
unsigned short SECTICKS=240; //24; //65536/(65536-(THV*256+TLV))*18;
unsigned short HALFSECTICKS=120; //12;
unsigned char sbuff[7];
unsigned char count=0,triggle=0,chno=0;
unsigned char ticks=0,oldP1Stat;
sbit RLed = P1^3;
bit direction=0,direction1=0,direction2=0;
/*void delay()
{
 unsigned short i,j;
 for(i=0;i<30;i++) j=i;
}*/
void t0int() interrupt 1
{
 //unsigned char i;
 TH0=THV; //Bcause TLV=0,no need to init TL0;
 count++;
 if ((oldP1Stat&0x10)==0x10 && (P1&0x10)==0x00) //UP triggle.
 {
  if ((P1&0x20)==0x20) direction1=1;
  else direction1=0;
 }
 if ((oldP1Stat&0x20)==0x20 && (P1&0x20)==0x00) //UP triggle.
 {
  if ((P1&0x10)==0x10) direction2=1;
  else direction2=0;
 }
 if(direction1 && !direction2) direction=1;
 if(!direction1 && direction2) direction=0;
 if((oldP1Stat^P1) & 0x10) ticks++;
 if((oldP1Stat^P1) & 0x20) ticks++;
 oldP1Stat=P1;
 if(count == HALFSECTICKS)
 {
  RLed=1;
  //triggle=1;
 }
 if(count == SECTICKS)
 {
  count=0; 
  RLed=0;
  sbuff[3]=P1;
  //Notice P1 had been modified.
  if (direction) sbuff[3]=sbuff[3] | 0x20;
  else sbuff[3]=(sbuff[3] & 0xDF);
  //For not modify the host vb program,add following lines.
  if (P1 & 0x10) sbuff[3] |=0x40; //deal pulse.
  else sbuff[3] &= 0xbf;
  if (P1 & 0x40) sbuff[3] |=0x10; //deal button.
  else sbuff[3] &= 0xef;
  //end
  sbuff[4]=ticks;
  ticks=0;
  triggle=1;
 }
}
void main (void)
{
 unsigned char i;
 sbuff[0]=0xD7;
 sbuff[1]=6;
 sbuff[2]='S';
 sbuff[5]=0;
 sbuff[6]='E';
 SCON  = 0x50;		        /* SCON: mode 1, 8-bit UART, enable rcvr      */
 TMOD |= 0x21;               /* TMOD: timer 1, mode 2, 8-bit reload        */
 TH1   = 0xe8; //0xd8,for now is 11059200; //1200bps .0xfb; // 9600 bps,0xd8;        /* TH1:  reload value for 1200 baud @ 18.432MHz   */
 TR1   = 1;                  /* TR1:  timer 1 run                          */
 TR0   = 1;
 TI    = 1;
 oldP1Stat=P1;
 IE    = 0x82;
 while (1)
 {
  if (triggle)
  {
   triggle=0; 
   for(i=0;i<7;i++) putchar(sbuff[i]);
  }
 }
}