/****************************************Copyright (c)**************************************************
**                                 driver program for lpc2100
**
**--------------文件信息--------------------------------------------------------------------------------
** 文件名: key.c
** 创建人: 林傅荣
** 日  期: 2011.8.4
** 描  述: 按键相关函数的实现
**
**--------------当前版本修订------------------------------------------------------------------------------
** 修改人:
** 日　期:
** 描　述:
**
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/#include "config.h"//Key_GPIO
#define     K1  8
#define     K2  9
#define     K3  10
#define     K4  11
#define     K5  12
#define     K7  13
#define     K6  14
#define     K8  15

int8u KeyScanLine(int8u column); //按键初始化
void KeyInit(int8u stat)
{if(0 == stat){IO0DIR = IO0DIR & (~((1 << K1) | (1 << K2) | (1 << K3) | (1 << K4) | (1 << K5) | (1 << K6) | (1 << K7) | (1 << K8)));}else{IO0DIR = IO0DIR & (~((1 << K5) | (1 << K6) | (1 << K7) | (1 << K8)));IO0DIR = IO0DIR | (1 << K1) | (1 << K2) | (1 << K3) | (1 << K4);}
}//按键扫描
int8u KeyScan(int8u stat)
{int32u KeyGPIO;int8u key = 0;if(0 == stat){KeyGPIO = ((1 << K1) | (1 << K2) | (1 << K3) | (1 << K4) | (1 << K5) | (1 << K6) | (1 << K7) | (1 << K8));if((KeyGPIO & IO0PIN) != KeyGPIO){OSTimeDly(50);if((KeyGPIO & IO0PIN) != KeyGPIO){if(0 == (IO0PIN & (1 << K1)))key = 1;else if(0 == (IO0PIN & (1 << K2)))key = 2;else if(0 == (IO0PIN & (1 << K3)))key = 3;else if(0 == (IO0PIN & (1 << K4)))key = 4;else if(0 == (IO0PIN & (1 << K5)))key = 5;else if(0 == (IO0PIN & (1 << K6)))key = 6;else if(0 == (IO0PIN & (1 << K7)))key = 7;else if(0 == (IO0PIN & (1 << K8)))key = 8;       while((KeyGPIO & IO0PIN) != KeyGPIO);}}}else{IO0CLR = (1 << K1);IO0SET = (1 << K2) | (1 << K3) | (1 << K4);key = KeyScanLine(1);if(key != 0)return key;IO0CLR = (1 << K2);IO0SET = (1 << K1) | (1 << K3) | (1 << K4);key = KeyScanLine(2);if(key != 0)return key;IO0CLR = (1 << K3);IO0SET = (1 << K1) | (1 << K2) | (1 << K4);key = KeyScanLine(3);if(key != 0)return key;IO0CLR = (1 << K4);IO0SET = (1 << K1) | (1 << K2) | (1 << K3);key = KeyScanLine(4);if(key != 0)return key;}return key;
}//扫描每行
int8u KeyScanLine(int8u column)
{int8u key = 0;if(0 == (IO0PIN & (1 << K5))){key = (column-1)*4 + 1;while(0 == (IO0PIN & (1 << K5)));}else if(0 == (IO0PIN & (1 << K6))){key = (column-1)*4 + 2;while(0 == (IO0PIN & (1 << K6)));}else if(0 == (IO0PIN & (1 << K7))){key = (column-1)*4 + 3;while(0 == (IO0PIN & (1 << K7)));}else if(0 == (IO0PIN & (1 << K8))){key = (column-1)*4 + 4;while(0 == (IO0PIN & (1 << K8)));}return key;
}/***************************************************************************************
**              End File
***************************************************************************************/