ARM7---矩阵键盘

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//config.h

#ifndef __CONFIG_H#define __CONFIG_H#include <LPC21xx.H>#ifndef TRUE#define TRUE 1#endif#ifndef FALSE#define FALSE 0#endiftypedef  unsigned char uint8;typedef  signed    char    int8;typedef  unsigned  short  uint16;typedef  signed  short  int16;typedef  unsigned  int  uint32;typedef  signed  int   int32;typedef  float  fp32;typedef  double  fp64 ;#define Fosc11059200#define Fcclk(Fosc*4)#define Fcco(Fcclk*4)#define Fpclk(Fcclk/4)*1#endif

//Text1.c

/***********************************************************************功能：不完美的ARM7 查询方式   4X4矩阵键盘**********************************************************************/#include "config.h"#define row1 0x00000080#define row2 0x00000100#define row3 0x00000200#define row4 0x00000400#define col1 0x00000800#define col2 0x00001000#define col3 0x00002000#define col4 0x00004000//显示的字符数组uint8 DispCode[]={0x3f,0x06,0x5b,0x4f,0x66,             //0-4    0x6d,0x7d,0x07,0xff,0x6f,              //5-9    0x77,0x7c,0x39,0x5e,0x79,             //A,b,C,d,E,F    0x71};//延时函数，消除抖动void Delay(uint16 count){uint8 i;                  while(--count != 0)    for(i = 0; i < 125; i++);           }//主函数入口int main(){PINSEL0 &= 0xc0000000;//设置P0.0-P0.14为IO口IO0DIR =0xffffffff;while(1){while(1){IO0CLR = row1+row2+row3+row4;//置行为低IO0SET = col1+col2+col3+col4;//置列为高IO0DIR &=0x000007ff;//设置0-10为输出，11-14为输入if(((IO0PIN & col1)==0) || ((IO0PIN & col2)==0) || ((IO0PIN & col3)==0) ||((IO0PIN & col4)==0)){Delay(20);//消除抖动if(((IO0PIN & col1)==0) || ((IO0PIN & col2)==0) || ((IO0PIN & col3)==0) ||((IO0PIN & col4)==0)){IO0CLR = 0x7f;  //清空IO0CLR = row1;IO0SET = row2+row3+row4;if((IO0PIN & col1)==0) {IO0SET = DispCode[0];break;}if((IO0PIN & col2)==0) {IO0SET = DispCode[1];break;   }if((IO0PIN & col3)==0) {IO0SET = DispCode[2];break;  }if((IO0PIN & col4)==0) {IO0SET = DispCode[3];break;   }IO0CLR = row2;IO0SET = row1+row3+row4;if((IO0PIN & col1)==0) {IO0SET = DispCode[4];break; }else if((IO0PIN & col2)==0) {IO0SET = DispCode[5];break;   }else if((IO0PIN & col3)==0) {IO0SET = DispCode[6];break;  }else if((IO0PIN & col4)==0) {IO0SET = DispCode[7];break;   }IO0CLR = row3;IO0SET = row1+row2+row4;if((IO0PIN & col1)==0) {IO0SET = DispCode[8];break; }else if((IO0PIN & col2)==0) {IO0SET = DispCode[9];break;   }else if((IO0PIN & col3)==0) {IO0SET = DispCode[10];break;  }else if((IO0PIN & col4)==0) {IO0SET = DispCode[11];break;   }IO0CLR = row4;IO0SET = row1+row2+row3;if((IO0PIN & col1)==0) {IO0SET = DispCode[12];break; }else if((IO0PIN & col2)==0) {IO0SET = DispCode[13];break;   }else if((IO0PIN & col3)==0) {IO0SET = DispCode[14];break;  }else if((IO0PIN & col4)==0) {IO0SET = DispCode[15];break;   }}}}}}

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