📄 main.i

📁 使用OKI公司8255A控制62256RAM程序,并使用8803液晶显示
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   while((*Text)>0)
   {
       Post_Msg(*Text);
       Text++;
       delay_us(5);
   }
}

//===========================================================
//---显示单个数字
void Show_Num(unsigned char X0,unsigned char Y0,unsigned char Num)
{
   Send_Com(0x12,0xB1);         //进入文本图层
   Send_Com(0x60,Y0);
   Send_Com(0x70,X0*8);
   Post_Msg(Num+48);      
}
//============================================================


//============================================================
//---显示浮点数
void Show_Number(unsigned char X0,unsigned char Y0,float Num,unsigned char DpLen)
{
   unsigned char i=0,j=0,mynum[6];
   unsigned int temp;   
   bit flag=0;							//flag:是否为负  
   Send_Com(0x12,0xB1);                           //进入文本层
   Send_Com(0x60,Y0);                                //消隐
   Send_Com(0x70,X0*8); 
   for(i=0;i<6;i++)Post_Msg(0x00);
   i=0;
   Send_Com(0x60,Y0); 
   Send_Com(0x70,X0*8); 
   if(Num<0){Num=fabs(Num);Post_Msg('-');flag=1;i++;}
  //-----------得到整数部分------------------  
   temp=(unsigned int)Num; //取整
   do
   {
      mynum[j]=temp%10;
   	  temp=temp/10;											  //丢末位
	  i++;
	  j++;     												  //位累加
   }while(temp!=0);
   //---------显示整数部分--------------------
   do
   {
    Post_Msg(mynum[j-1]+48);                      //显示每位
    ;j--;
   }while(j>0);
   j=0;
   //---------处理小数部分-------------------	 
   if((flag&&i<4)||(!flag&&i<5))
   {
     i++;  			  //累加小数点位
     temp=(unsigned int)Num;		 //重新取整
     Num=Num-temp;	 //得到小数部分
     do
      {
	   Num=Num*10;
	   temp=Num;
	   mynum[j]=temp%10;	   				  
	   i++;
	   j++;
	  }while(i<6&&j<DpLen);	  //保留指定小数位
	  i=0;temp=0;
   	 do
	  {
	    temp+=mynum[i];i++;	  
	  }while(i<j);
	  i=0;
	  //-------------显示小数部分---------------
	if(DpLen)
	{
	if((DpLen<8)||(DpLen>=8&&temp!=0))
	{
	  Post_Msg('.');
	do
	  {Post_Msg(mynum[i]+48);i++;} 
	while(i<j);
	}
	}
   }
}	
//************************************


/************************************************************************
滚动x1到x2这几行的显示屏幕，行是以一个象点为单位
************************************************************************/  
void h_gundong(unsigned x1,unsigned char x2)
{Send_Com(0x03,0xf3);
 Send_Com(0x71,x1*16);
 Send_Com(0x72,x2*16);
 }
 
/************************************************************************
/向上垂直滚动整个屏幕
************************************************************************/  
void l_gundong(unsigned y1,unsigned char y2)
{Send_Com(0x03,0xf4);
 Send_Com(0x71,y1);
 Send_Com(0x72,y2);
 }
//*************************************************************************


//================
//画点
void point(unsigned char X0,unsigned char Y0,unsigned char Pos) 
{
   unsigned char Temp;
   Send_Com(0x12,0xB1+Pos);                     //选择操作图层
   Send_Com(0x00,0xC3);
   Send_Com(0x60,Y0/8);
   Send_Com(0x70,X0);
   Temp=Read_Data(Y0/8,X0,Pos);
   Temp|=0x80>>(Y0%8);
   Post_Msg(Temp);      
   Send_Com(0x00,0xCD);
}

void point_back(unsigned char X0,unsigned char Y0,unsigned char type)
{
 unsigned char temp=0;
 Send_Com(0x12,0x32);//读写数据均在第二层屏幕上面操作
 temp=Y0%8;
 temp=1<<(7-temp);
 Send_Com(0x00,0xc5);//进入图形模式
 Send_Com(0x60,Y0/8); //ｘ，ｙ与液晶的实际地址刚好是反的
 Send_Com(0x70,X0);
 if(type)temp|=Read_Data(Y0/8,X0,type);
 else
  {temp=~temp;
   temp&=Read_Data(Y0/8,X0,type);
   }
 Post_Msg(temp);
 Send_Com(0x12,0x31);//返回到第一层屏幕的操作
 Send_Com(0x00,0xcd);//返回到文字模式 
}
/***************************************************************************
该函数的功能是在屏幕上面打印一条直线 
x1,y1分别表示所画直线的起点坐标 ，x2,y2表示的是所画的直线的终点坐标
type表示的是所画的是空line还是实line，画空line的目的是可以擦除上次画的line

注意x2>x1,y2>y1;必须得保证这两个条件  
****************************************************************************/ 
void Line(unsigned char x1,unsigned char y1,unsigned char x2,unsigned char y2)
{float xielv;
 float temp; 
 unsigned char i;
 xielv=((float)(x2)-(float)(x1))/((float)y2-(float)(y1));
 if(y1==y2)
 {
  if(x1<=x2)
   for(i=x1;i<=x2;i++)point_back(i,y1,2); 
  else
   for(i=x2;i<=x1;i++)point_back(i,y1,2); 
  }
 else 
  if(y1<y2)
  {
   for(i=0;i<(y2-y1);i++)
    {temp=x1+xielv*i;
     point_back(temp,y1+i,2); 
     }
   }
 else
  if(y1>y2)
  {
   xielv=-xielv;
   for(i=0;i<(y1-y2);i++)
    {temp=x1+xielv*i;
     point_back(temp,y1-i,2); 
     }
   } 
 }

void init_8803(void)
{
   DDRA.0          =1;
   DDRA.1          =1;
   DDRB.0          =1;
   DDRA.2          =1;
   DDRB.4=1;
   DDRC           =0xFF;
   reset_lcd();
   clear();
 
}
// CodeVisionAVR C Compiler
// (C) 1998-2001 Pavel Haiduc, HP InfoTech S.R.L.

// I/O registers definitions for the ATmega16






// CodeVisionAVR C Compiler
// (C) 1998-2000 Pavel Haiduc, HP InfoTech S.R.L.







void reset8255(unsigned char state)
{
 DDRC=0xff;DDRA.3=1;DDRA.2 =1;DDRB.3=1;DDRA.4=1;DDRA.0=1;
 
 PORTB.3=0;          //片选上
 PORTA.3=1;          PORTA.2=1;//写入寄存器
 PORTA.0=0;
 PORTA.4=1;
 PORTC=state;
 PORTA.0=1;
 PORTB.3=1;
 DDRC=0x00;
 } 
 
void send8255(unsigned char data,unsigned char direct) 
{
 DDRC=0xff;
 PORTB.3=0;
 switch(direct)
 {
  case 0: PORTA.3=0;PORTA.2=0;break;
  case 1: PORTA.3=0;PORTA.2=1;break;
  case 2: PORTA.3=1;PORTA.2=0;break;
  case 3: PORTA.3=1;PORTA.2=1;break;
  } 
 PORTA.0=0;
 PORTA.4=1;
 PORTC=data;
 PORTA.0=1;
 PORTB.3=1;  
 }
 
void send_a(unsigned char data)
{
 DDRC=0xff; 
 PORTB.3=0;
 PORTA.3=0;PORTA.2=0; 
 PORTA.0=0;
 PORTA.4=1;
 PORTC=data;
 
 PORTA.0=1;
 PORTB.3=1;
 DDRC=0x00;
 }
 
void send_b(unsigned char data)
{
 DDRC=0xff;
 PORTB.3=0;
 PORTA.3=0;PORTA.2=1;
 PORTA.0=0;
 PORTA.4=1;
 PORTC=data;
 PORTA.0=1;
 PORTB.3=1;
 DDRC=0x00;
 }
  
void send_c(unsigned char data)
{
 DDRC=0xff;
 PORTB.3=0;
 PORTA.3=1;PORTA.2=0; 
 PORTA.0=0;
 PORTA.4=1;
 PORTC=data;
 PORTA.0=1;
 PORTB.3=1;
 DDRC=0x00;
 } 
  
void send_r(unsigned char data)
{
 DDRC=0xff;
 PORTB.3=0;
 PORTA.3=1;PORTA.2=1;
 PORTA.0=0;
 PORTA.4=1;
 PORTC=data;
 PORTA.0=1;
 PORTB.3=1;
 DDRC=0x00;
 }    

void writeram(unsigned int address,unsigned char data)
{unsigned char temp=0;
 DDRB.2=1;
 PORTB.2=1;
 temp=address;
 send_a(temp);
 address=address>>8;
 temp=address;
 send_b(temp);
 DDRC=0xff;
 PORTC=data;  
 
 PORTB.2=0;//片选上62256   
 #asm("NOP")
 PORTA.0=0;
 PORTA.0=1;
 #asm("NOP")
 temp=PINC;
 PORTB.2=1;
 
 }
unsigned char readram(unsigned int address)
{unsigned char temp=0;
 DDRB.2=1;
 PORTB.2=1;
 DDRA.4=1;
 temp=address;
 send_a(temp);
 address=address>>8;
 temp=address;
 send_b(temp);
 DDRC=0x00;
 PORTC=0x00;
 
 PORTB.2=0;//片选上62256   
 PORTA.4=0;
 #asm
 NOP
 NOP
 #endasm
 temp=PINC;
 PORTA.4=1; 
 PORTB.2=1;
  
 return temp; 
 } 
unsigned char i=0,j=0;
unsigned char data=0;

void Display(unsigned char data_temp)
{
unsigned char tmp;
tmp=data_temp/100;
word(i,j,tmp+48);
j++;
tmp=data_temp%100/10;
word(i,j,tmp+48);
j++;
tmp=data_temp%10;
word(i,j,tmp+48);
j+=3;
if(j>18){j=0;i+=2;if(i>6)i=0;}
}

void main(void)
{
unsigned char temp=0;

reset8255(0x80);
init_8803();

writeram(0,60);
writeram(1,128);
writeram(2,50);
writeram(3,99);
Display(readram(0));
Display(readram(1));
Display(readram(2));
Display(readram(3));
Display(readram(4));
Display(readram(5));


while(1){};
}
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