【单片机】8255控制交通灯

代码详解

#include <reg51.h>
#include <intrins.h>
#include <absacc.h>

#define uchar unsigned char
#define PA XBYTE[0xff28]
#define PB XBYTE[0xff29]
#define PC XBYTE[0xff2A]
#define KZ XBYTE[0xff2B]

unsigned char j = 0;
unsigned char i = 0;
unsigned char code mon51[3] _at_ 0x3b; //保留0X3B开始三个程序空间作全速中断用

void delay(unsigned int i)
{
  unsigned int j, k;
  for (k = 0; k < i; k++)
    for (j = 0; j < 1000; j++)
      ;
}
void main(void)
{
  KZ = 0x80;
  while (1)
  {
    PA = 0xB6;
    PB = 0x0D;
    delay(500);
    //1
    PA = 0X76;
    PB = 0X0b;
    delay(500);
    //2
    for (i = 0; i < 5; i++)
    {
      PA = 0XF6;
      PB = 0XFF;
      delay(100);
      PA = 0XF6;
      PB = 0X06;
      delay(100);
    }
    //3
    PB = 0X0D;
    PA = 0XAD;
    delay(500);
    //4
    for (i = 0; i < 5; i++)
    {
      PA = 0XBF;
      PB = 0X0D;
      delay(100);
      PA = 0X9B;
      PB = 0X0D;
      delay(100);
    }
  }
}