62256__.c

使用OKI公司8255A控制62256RAM程序,并使用8803液晶显示

#include"mega16.h"
#include"delay.h" 
#include"8255.c"
#define WR      PORTB.0
#define WR_en   DDRB.0
#define RD      PORTB.1
#define RD_en   DDRB.1
#define CS      PORTB.4
#define CS_en   DDRB.4
#define A1      PORTB.5
#define A1_en   DDRB.5
#define A0      PORTB.6
#define A0_en   DDRB.6 
#define BUS_out PORTC
#define BUS_in  PINC
#define BUS_en  DDRC
void rest8255(unsigned char state)
{BUS_en=0xff;A1_en=1;A0_en=1;CS_en=1;RD_en=1;WR_en=1;
 BUS_out=0xff;
 CS=0;          //片选上
 A1=1;          A0=1;//写入寄存器
 WR=0;
 BUS_out=state;
 WR=1;
 CS=1;
 }
void send8255(unsigned char data,unsigned char direct) 
{BUS_en=0xff;
 CS=0;
 switch(direct)
 {case 0: A1=0;A0=0;break;
  case 1: A1=0;A0=1;break;
  case 2: A1=1;A0=0;break;
  case 3: A1=1;A0=1;break;
  } 
 WR=0;
 BUS_out=data;
 WR=1;
 CS=1;  
 }
#include"chuankou.c"
//#include<mega16.h>
//#include<delay.h >
#define clock PORTD.6 
#define clock_en DDRD.6 
#define date PORTD.7
#define date_en DDRD.7
void send(unsigned char w);
void xianshi(long w,unsigned char weishu); 
flash unsigned char  Led_tab[2][23]={              /*共阳数码管 显示段笔划 abcdefgh; 0=亮 *//* 0,1,2,3,4,5,6,7 */	 /* 8,9,A,b,C,d,E,F */
     0x03,0x9F,0x25,0x0D,0x99,0x49,0x41,0x1F,   
     0x01,0x09,0x11,0xC1,0x63,0x85,0x61,0x71,   
     0xFF,0x31,0x91,0xE3,0xFD,0x6D,0xD5,0x02,
     0x9E,0x24,0x0C,0x98,0x48,0x40,0x1E,0x00,
     0x08,0x10,0xC0,0x62,0x84,0x60,0x70,0x02,
     0x30,0x90,0xE2,0xFC,0x6E,0xD4};  
 
void send(unsigned char w)
{unsigned char i;
 for(i=0;i<8;i++)
 {clock=0;
  date=w&1; 
  clock=1;
  w=w>>1;
  }
 }
void xianshi(long w,unsigned char weishu)
{unsigned char i;
 unsigned char k;
 bit flag=0;
 if(w<0)
  {w=-w;
   flag=1;
   }
 clock_en=1;              
 date_en=1;
 for(i=0;i<8;i++)
  {
  if(w!=0)
  {k=Led_tab[0][w%10];
   if(i==weishu)k=Led_tab[1][w%10];
   }
  else
    {if(flag)
      {k=253;
       }
     if(i==weishu)k=Led_tab[1][w%10]; 
     else
       if(i<weishu)k=0x03;
        else 
         {if(!flag)
           {k=0xff;
            }
           if((i==(weishu+1))&&flag)k=253; 
           flag=0; 
          }
        
     }
   send(k);
   w=w/10;
   }
 } 
main()
{unsigned char k=0; 
 unsigned char w=0;
 DDRA=0xff;
 PORTA=0xff;
 //DDRB=0xff;
 //PORTC=0xff;
 //PORTB=0xff;
 DDRC=0xff;
 xianshi(12345678,0);
 rest8255(0x80);
 send8255(0xff,0);
 send8255(0xff,1);
 send8255(0xff,2);
 while(1)
 { 
 //先送地址0x0000
 send8255(0x01,0);
 send8255(0x01,1);
 PORTC=w;  
 w++;
 PORTA.7=0;//片选上62256
 WR=0;
 WR=1;
 PORTA.7=1;
 
 
 send8255(0x01,0);
 send8255(0x01,1);
 //PORTC=0x03;
 DDRC=0x00;
 PORTC=0x00;
 PORTA.7=0;//片选上62256 
 
 RD=0;
 RD=1;
 delay_us(1); 
 k=PINC;
 PORTA.7=1; 
 DDRC=0xff;
 xianshi(k,0);
 delay_ms(100);
 }
 }