keypaddrv.c

一个经典的3X4键盘扫描驱动

#include "Hal.h"
#include "WatchDog.h"
#include "Delay.h"
#include "LedDrv.h"
#include "LcdMiniDrv.h"
#include "BuzzerDrv.h"
//#include "ZmDebug.h"

/////////////////////////////////////////////////////////////////////
//键盘硬件操作说明：
//__KEY_SIN__全部上拉
//然后全部__KEY_SIN__设为1，全部__KEY_SOUT__设为1
//在__KEY_SOUT__将其中1个设为0，查看__KEY_SIN__中哪个为0，即哪个键有按下
//看__KEY_SOUT__有多少个 即循环多少次
/////////////////////////////////////////////////////////////////////

/*
sbit __KEY_SIN_1__	=	P1^0;
sbit __KEY_SIN_2__	=	P1^1;
sbit __KEY_SIN_3__	=	P1^2;

sbit	__KEY_SOUT_1__ = P2^0;
sbit	__KEY_SOUT_2__ = P2^1;
sbit	__KEY_SOUT_3__ = P2^2;
sbit	__KEY_SOUT_4__ = P2^3;
*/

#define _KSI_1		__KEY_SIN_1__
#define _KSI_2		__KEY_SIN_2__
#define _KSI_3		__KEY_SIN_3__

#define _KSO_1		__KEY_SOUT_1__
#define _KSO_2		__KEY_SOUT_2__
#define _KSO_3		__KEY_SOUT_3__
#define _KSO_4		__KEY_SOUT_4__



BOOL _ZmLowLevelGetKey(BYTE * pucKeyIndex)
{
	BYTE idata i;
	BYTE idata ucP2 = P2;
	_KSI_1 = 1;
	_KSI_2 = 1;
	_KSI_3 = 1;
	*pucKeyIndex = 0;
	for(i = 0; i < 4; i++)
	{
		P2 = 0xff;
		switch(i)
		{
		case 0:
			_KSO_1 = 0;
			break;
		case 1:
			_KSO_2 = 0;
			break;
		case 2:
			_KSO_3 = 0;
			break;
		case 3:
			_KSO_4 = 0;
			break;
		}
		(*pucKeyIndex)++;
		if(!_KSI_1)
			goto RetTrue;
		(*pucKeyIndex)++;
		if(!_KSI_2)
			goto RetTrue;
		(*pucKeyIndex)++;
		if(!_KSI_3)
			goto RetTrue;
	}
	P2 = ucP2;
	return FALSE;
RetTrue:
	P2 = ucP2;
	return TRUE;
}

//code char pstrKeyCode[12] = "1234567890*#";
//code char pstrKeyCode[12] = "789456*0#123";	//for the Old Keypad(ACTR)
//code char pstrKeyCode[12] = "321#0*654987";		//for new designed keypad.
code char pstrKeyCode[12] = "#0*987654321";		//for new designed keypad.

char DecodeKey(BYTE ucKeyIndex)
{
	if((ucKeyIndex < 1) || (ucKeyIndex > 12))
		return ' ';
	return pstrKeyCode[ucKeyIndex-1];
}


//获取键盘的数值，存放在指针pcX所指位置
//为什么不是返回一个字节所获数值的函数？？
//为了减少单片机RAM??
BOOL ZmGetKey(char * pcX)
{
	BYTE idata ucIndex;
	if(_ZmLowLevelGetKey(&ucIndex))
	{
		*pcX = DecodeKey(ucIndex);
		LedOn();
		BuzzerKey();
		Msec(100);
		while(_ZmLowLevelGetKey(&ucIndex))
		{
			TrigWatchDog();
			Msec(150);
		}
		LedOff();
		Msec(50);
		return TRUE;
	}
	return FALSE;
}


//将返回值存放在指针pcX所指位置
BOOL ZmGetKeyDelay(char * pcX)	//循环100次访问键盘
{
	BYTE idata ucIndex;
	BYTE idata i;
	for(i = 0; i < 100; i++)
	{
		if(_ZmLowLevelGetKey(&ucIndex))
		{
			*pcX = DecodeKey(ucIndex);
			LedOn();
			BuzzerKey();
			Msec(100);
			while(_ZmLowLevelGetKey(&ucIndex))
			{
				TrigWatchDog();
				Msec(150);
			}
			LedOff();
			Msec(50);
			return TRUE;
		}
		Msec(50);
	}
	return FALSE;
}


/*
char _getkey (void)
{
	char idata cRt;
	for(;;)
	{
		if(ZmGetKey(&cRt))
			return cRt;
		TrigWatchDog();
	}
}

BOOL ZmGetPassChar(char * pcX)
{
	if(ZmGetKeyDelay(pcX))
	{
		putchar('*');
		return TRUE;
	}
	return FALSE;
}
*/