单片机C语言程序设计实训100例

				#include 
				#include 
				#define uchar unsigned char
				#define uint unsigned int
				
				uchar code DSY_CODE[]=
				{
				 	0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff
				};
				uchar Num_Buffer[] = {0,0,0};
				uchar Key_Code,Key_Counts=0;
				
				void DelayMS(uint x)
				{
				 	uchar t;
					while(x--)
					{
					 	for(t=0;t					}
				}
				
				void Show_Counts_ON_DSY()
				{
				 	uchar i,j=0x01;
					Num_Buffer[2]=Key_Counts/100;
				   	Num_Buffer[1]=Key_Counts/10%10;
					Num_Buffer[0]=Key_Counts%10;
					for(i=0;i					{
					 	j = _cror_(j,1);
						P2 = j;
						P0 = DSY_CODE[Num_Buffer[i]];
						DelayMS(1);
					}
				}
				
				void main()
				{
				 	uchar i;
					P0 = 0xff;
					P1 = 0xff;
					P2 = 0x00;
					Key_Code = 0xff;
					while(1)
					{
					 	Show_Counts_ON_DSY();
						P1 = 0xff;
						Key_Code = P1;
						if(Key_Code != 0xff)
						{
							for(i=0;i							{
							 	Show_Counts_ON_DSY();
							}
						}
						switch(Key_Code)
						{
						 	case 0xfe:if(Key_Counts							case 0xfd:if(Key_Counts>0)	 Key_Counts--;break;
							case 0xfb:Key_Counts=0;
						}
						Key_Code = 0xff;
					}
				}