pc键盘.c

C51单片机PC键盘扫描输入

	#include<ASC2.h>
	#include<LCD.h>

	#define disp_on 0x3f
	#define disp_off 0x3e
	#define col_add 0x40
	#define page_add 0xb8
	#define start_line 0xc0
	
	unsigned char x=0,y=0,sscs=0;

	#define cs XBYTE[0X8000]
	#define wc XBYTE[0XA000]
	#define wd XBYTE[0XA001]
 
	void delay(unsigned int t)
	{
		unsigned int i,j;
		for(i=0;i<t;i++)
			for(j=0;j<10;j++);
	}	

	void write_command(unsigned char cmdcode)
	{
		wc=cmdcode;
	}

	void write_data(unsigned char dispdata)
	{	
		wd=dispdata;
	}
	
	void clr_scr()
	{
		unsigned char j,k;
		cs=0x10;
			for(j=0;j<8;j++)
			{
				write_command(page_add+j);
				write_command(col_add+0);
				for(k=0;k<64;k++)
					write_data(0x00);
			}
		cs=0x20;
			for(j=0;j<8;j++)
			{
				write_command(page_add+j);
				write_command(col_add+0);
				for(k=0;k<64;k++)
					write_data(0x00);
			}
		x=0;y=0;
	}

	void sz_disp16(unsigned char pag,unsigned char col,unsigned char code *szk)
	{
		unsigned char j,k;
		for(j=0;j<2;j++)
		{
			write_command(page_add+pag+j);
			write_command(col_add+col);
			for(k=0;k<8;k++)
				write_data(szk[8*j+k]);
		}	
	}

	void init_lcd()
	{
		cs=0x30;
		delay(100);
		write_command(disp_off);
		write_command(page_add+0);
		write_command(start_line);
		write_command(col_add+0);
		write_command(disp_on);
	}

	void putgb()
	{
		sscs++;
		if(sscs==300)
			sscs=0;
		if(y<8)
		{
			cs=0x10;
			if(sscs<150)
				sz_disp16(x*2,y*8,guangbiao);
			else
				sz_disp16(x*2,y*8,kongbai);
		}
		if(y>=8)
		{
			cs=0x20;
			if(sscs<150)
				sz_disp16(x*2,(y-8)*8,guangbiao);
			else
				sz_disp16(x*2,(y-8)*8,kongbai);
		}
	}

	void putkongbai()
	{
		if(y<8)
		{
			cs=0x10;
			sz_disp16(x*2,y*8,kongbai);
		}
		if(y>=8)
		{
			cs=0x20;
			sz_disp16(x*2,(y-8)*8,kongbai);
		}
	}

	void putchar(unsigned char p)
	{
		bit bs_flag=0;
		unsigned char code *c;
		unsigned char j,k;
		if(p<' ')
		{
			if(p=='\n')
			{
				if(x==3)
					return;
				x++;
				y=0;
			}
			else if(p=='\b')
			{
				putkongbai();
				if(y==0)
				{
					if(x==0)
						return;
					x--;
	   			    y=15;
					p=' ';
					bs_flag=1;
					goto start;
				}
				else
				{
					y--;
					p=' ';
					bs_flag=1;
					goto start;
				}
			}
			return;
		}
start:  c=ASCII_TAB+(p-' ')*16;
		if(y<8)
		{
			cs=0x10;
			for(j=0;j<2;j++)
			{
				write_command(page_add+x*2+j);
				write_command(col_add+y*8);
				for(k=0;k<8;k++)
					write_data(*c++);
			}
		}
		if(y>=8)
		{
			cs=0x20;	
			for(j=0;j<2;j++)
			{
				write_command(page_add+x*2+j);
				write_command(col_add+(y-8)*8);
				for(k=0;k<8;k++)
					write_data(*c++);
			}
		}
		if(bs_flag) return;
		y++;
		if(y==16)
		{
			if(x==3)
			{
				y=15;
				return;
			}
			else
			{
				y=0;
				x++;
			}
		}
		putgb();
	}