keyboard.c

来自「msp430驱动340*240程序 包括显示图片 文字 以及一些改变字体颜色功能」· C语言 代码 · 共 37 行

#include <at89x52.H>
#include <intrins.h>
#include "keyboard.h"
#define key_port P3
unsigned char code keynum[]={0x01,0X7E,0X7D,0X7B,0X77,0XBE,0XBD,0XBB,0XB7,0XDE,0xDD,0XDB,0XD7,0XEE,0XED,0XEB,0XE7};  //键盘对应 
 void delay(unsigned int k)  
{               		
unsigned int i,j;               
for(i=0;i<k;i++){           
for(j=0;j<121;j++)          
{;}}                		
}
unsigned char scan()
{
 unsigned char temp=0xff,i;
 key_port=0xf0;
 if(key_port!=0xf0)
  {
   delay(10);
   if(key_port!=0xf0)
   {
    temp=key_port;
    key_port=0x0f;
    temp=(temp&0xf0)|(key_port&0x0f);
    while(key_port!=0x0f);
    for(i=1;i<17;i++)
     {
      if(keynum[i]==temp)
      break;
     }
    }
  }
  else
  {return -1;}
  return i;
}