main_ex6.c

最近开发的51单片机多功能 实验板

#include <REGX51.H>
#define uchar unsigned char
extern void delay(unsigned int i ); 

ex6()
{
uchar code dispcode[]=
    	{ 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,
     //字形 0   1    2    3    4    5    6    7    8   9 
          0x88,0x83,0xc6,0xa1,0x86,0x8e,0xff,0xbf,0xff};
    //字形 A   B    C   D    E    F       	-
//uchar code dispbitcode[]= 
//	{0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe,0xff};  
	// 字位码		
  unsigned char LED,key,action=1;
  LED = 0x01;
  while(1)
  {
     P0 = dispcode[8];
     P2 = LED;   // LED取反送P1
	 delay(1500);
	 P2 |= 0xf0;
	 key=P2 & 0xf0;
	 P2 &= 0x0f;
	 if (key != 0xf0){
		 if (key == 0xe0) action = 1;
		 else if (key == 0x70) action = 3;
		 else action = 2;
	  }
	 switch(action)
	 {
	 	case 1:
			 if(LED) LED >>=1;
			 else LED = 0x10;
			 break;
	 	case 2:
			 break;
	 	case 3:
			 if(LED != 0x20) LED <<=1;
			 else LED = 0x01;
			 break;
	 }  

   }
}