keypad.c

很强的射频卡reader源代码

#include <STC89C516.H>
#include "Rc632cv.h"
#include "reader.h"


#if 0
//bit flag_keyon;		//有键未释放
static unsigned char  keydly=0;  //延时记数
//=0xff 无键
unsigned char get_key()
{
	unsigned char data ch,k;

	P2 = 0x0F;
	ch = P2 & 0x0F;
	//检测按键按下
	while(1)
	{
		if (ch != 0x0F)
		{
			keydly ++;
		}		
		else
		{
			return 0xff;
		}				
		if (keydly > 100)
		{
			break;
		}
	}
	//读键值
	
	while(1)
	{
		P2 = ~0x40;
		ch = P2 & 0x0F;
		if (ch != 0x0F)	
		{
			ch |= 0x10;
			break;
		}

		P2 = ~0x20;
		ch = P2 & 0x0F;
		if (ch != 0x0F)	
		{
			ch |= 0x20;
			break;
		}

		P2 = ~0x10;
		ch = P2 & 0x0F;
		if (ch != 0x0F)	
		{
			ch |= 0x30;
			break;		    
		}
		
		return 0xff;	
	}
	
	// 等待按键弹起来
	P2 = 0x0F;
	k = P2 & 0x0F;
	keydly=0;
	while(1)
	{
		if (k == 0x0F)
		{
			keydly ++;
		}		
		else
		{
			return 0xff;
		}				
		if (keydly > 250)
		{
			break;
		}
	}
	
	if      (ch == 0x1E)	ch = 0xa;
	else if (ch == 0x2E)	ch = 0;
	else if (ch == 0x3E)	ch = 0xb;

	else if (ch == 0x37)	ch = 1;
	else if (ch == 0x27)	ch = 2;
	else if (ch == 0x17)	ch = 3;

	else if (ch == 0x3B)	ch = 4;
	else if (ch == 0x2B)	ch = 5;
	else if (ch == 0x1B)	ch = 6;

	else if (ch == 0x3D)	ch = 7;
	else if (ch == 0x2D)	ch = 8;
	else if (ch == 0x1D)	ch = 9;
	else ch = 0xff;

	return ch;
}

	
unsigned char getkey()
{
	unsigned char code keycode[16]={'0','1','2','3',
									'4','5','6','7',
									'8','9','#','*',
									'0','0','0','0'	};
	unsigned char data k;
						
	k=get_key();									
	if(k==0xff)	
	{
		return 0;	
	}
	k=keycode[k];
	return k;
}
#else

bit flag_keyon;		//有键未释放


static unsigned char  keydly=0;  //延时记数

unsigned char get_key(void)
{

		unsigned char ch;
		unsigned char L1,L2;
	#if (MCTYPE==CV5100)
		L1=5;
		L2=5;
	#else
		L1=20;
		L2=8;
	#endif



	P2 = 0x0F;
	ch = P2 & 0x0F;

	if (flag_keyon)								
	{
		if (ch != 0x0F)	keydly = 0;
		else			keydly++;

		if (keydly >L1)
		{
			flag_keyon = 0;
			keydly = 0;
		}
		return 0xff;	

	}

	if (ch == 0x0F)	
	{
		keydly = 0;
		return 0xff;	
	}
	keydly++;
	if (keydly < L2) return 0xff;	
 
	flag_keyon = 1;
	keydly = 0;
	while(1)
	{
		P2 = ~0x40;
		ch = P2 & 0x0F;
		if (ch != 0x0F)	
		{
			ch |= 0x10;
			break;
		}

		P2 = ~0x20;
		ch = P2 & 0x0F;
		if (ch != 0x0F)	
		{
			ch |= 0x20;
			break;
		}

		P2 = ~0x10;
		ch = P2 & 0x0F;
		if (ch != 0x0F)	
		{
			ch |= 0x30;
			break;		    
		}
			

	
		
	}
		if      (ch == 0x1E)	ch = 0xb;
		else if (ch == 0x2E)	ch = 0;
		else if (ch == 0x3E)	ch = 0xa;

		else if (ch == 0x37)	ch = 1;
		else if (ch == 0x27)	ch = 2;
		else if (ch == 0x17)	ch = 3;

		else if (ch == 0x3B)	ch = 4;
		else if (ch == 0x2B)	ch = 5;
		else if (ch == 0x1B)	ch = 6;

		else if (ch == 0x3D)	ch = 7;
		else if (ch == 0x2D)	ch = 8;
		else if (ch == 0x1D)	ch = 9;
		else ch = 0xff;
		
	return ch;	
}


unsigned char getkey()
{

	unsigned char ch;
	
	unsigned char code keycode[16]={'0','1','2','3',
									'4','5','6','7',
									'8','9','*','#',
									 0,  0,  0,  0	};
	
	ch=get_key();
	if(ch==0xff)
	{
		return 0;	
	}
	ch=keycode[ch];
	return ch;
	
}
#endif