key.cpp

基于ARM 44b0的启动应到程序

#include "includes.h"
#include "Key.h"

void InitKey(int iFlag)
{
	if(iFlag)
	{
		//设置状态为：行信号输入，列信号输出低电平
		//行信号 GPD[0..3] 输入（外部上拉）
		rPCOND &= 0xff00;	//PCOND[7..0]=00000000
		//列信号 GPF[0..5] 输出低电平
		rPCONF &= 0xfffff000;
		rPCONF |= 0x0555;	//PCONF[12..0]=0010101010101
		rPDATF &= 0xffc0;	//PDATF[5..0]=000000
	}
	else // col input,row output
	{
		//设置状态为：列信号输入，行信号输出低电平
		//列信号 GPF[0..5] 输入（外部上拉）
		rPCONF &= (0xff<<12);	//PCONF[12..0]=0000000000000
		//行信号 GPD[0..3] 输出低电平
		rPCOND &= (0xFF<<8);
		rPCOND |= 0x0055;	//PCOND[7..0]=01010101
		rPDATD &= 0xF0;		//PDATD[3..0]=0000
	}
	
}

void SetKeyInt()
{
	rPCOND &= ~(0x300);
	rPCOND |= 0x100;
	rPDATD |= 0x10;
	(*(volatile unsigned int *)( 0x1d20040))&=~0x03;
}


//功能：检查是否有键按下
int iIfkbhit(void)
{
	unsigned int uiCount;
	
	if(!(rPDATG&0x01))
	{
		for(uiCount=0;uiCount<0x3500;uiCount++);
		//vDelayMs(10);//延时10Ms
		if(!(rPDATG&0x01))
		{
			return 1;
		}
	}
	return 0;
}

unsigned char ReadKey()
{
	unsigned char ucKeyA,ucKeyB;
	unsigned char ucTmp;
	
	InitKey(1);
	//当前状态：列信号输入，行信号输出低电平
	//读入列信号
	ucTmp = (rPDATD & 0x0f);
	//printf("读入列信号x=%x\n",ucTmp);
	switch(ucTmp)
	{
		case 0x0e :
			ucKeyA = 0x00; break;
		case 0x0d :
			ucKeyA = 0x01; break;
		case 0x0b :
			ucKeyA = 0x02; break;
		case 0x07 :
			ucKeyA = 0x03; break;
		default   :
			ucKeyA = 0xff;
			return ucKeyA;
	}
	
	InitKey(0);
	//读入列信号
	ucTmp = (rPDATF & 0x3f);
	switch(ucTmp)
	{
		case 0x3e : 
			ucKeyB = 0x05; break;
		case 0x3d : 
			ucKeyB = 0x04; break;
		case 0x3b : 
			ucKeyB = 0x03; break;
		case 0x37 : 
			ucKeyB = 0x02; break;
		case 0x2f : 
			ucKeyB = 0x01; break;
		case 0x1f : 
			ucKeyB = 0x00; break;
		case 0x3c : //
			if(ucKeyA==3)
				ucKeyB = 0x05; break;//双键（确认）
		default   : 
			ucKeyB = 0xff;
			break;
	}

	//恢复键盘端口（列信号输入，行信号输出低电平）设置，为下次读入键值做准备
	return ucKeyA;
}
unsigned char GetKey()
{
	unsigned char ucKey;
	
	while(!iIfkbhit());
	ucKey = ReadKey();
	//当按键放开后，返回键值
	while(!(rPDATG & 0x01));
	return ucKey;
}