单片机学习笔记八按键服务函数和数码管显示服务函数

　　//key_Service()按键服务函数 //dis_Service()//数码管显示服务函数 ********************************************************** unsigned char wnd; unsigned char parm1 = 44; unsigned char parm2 = 55; unsigned char parm3 = 66; unsigned char parm4 = 77; void  dis_Service();  void key_Service()//按键服务函数 { 	switch(Key_Scan()) 	{ 		case 1: wnd++; if(wnd>3) wnd =0; break;//这段代码实现窗口切换 		case 2: 			switch(wnd)//这段代码实现数据加一 			{   				case 0: parm1++; if(parm1>99) parm1 =0; break; 				case 1: parm2++; if(parm2>99) parm2 =0; break; 				case 2: parm3++; if(parm3>99) parm3 =0; break; 				case 3: parm4++; if(parm4>99) parm4 =0; break; 				default: break; 			} 		case 3: 			switch(wnd)//这段代码实现数据减一 			{   				case 0: parm1--; if(parm1>99) parm1 =99; break; 				case 1: parm2--; if(parm2>99) parm2 =99; break; 				case 2: parm3--; if(parm3>99) parm3 =99; break; 				case 3: parm4--; if(parm4>99) parm4 =99; break; 				default: break; 			} 		case 4: 			switch(wnd)//这段代码实现数据清零 			{   				case 0: parm1 =0; break; 				case 1: parm2 =0; break; 				case 2: parm3 =0; break; 				case 3: parm4 =0; break; 				default: break; 			} 		default: break;	 	} } void dis_Service()//数码管显示服务函数 { 	switch(wnd) 			{   				case 0:            ledbuf[0] = 0; 				  ledbuf[1] = 0; 				  ledbuf[2] = parm1/10; 				  ledbuf[3] = parm1%10; 				  break; 				case 1:  					ledbuf[0] = 0; 				  ledbuf[1] = 0; 				  ledbuf[2] = parm2/10; 				  ledbuf[3] = parm2%10; 				  break; 				case 2:  					ledbuf[0] = 0; 				  ledbuf[1] = 0; 				  ledbuf[2] = parm3/10; 				  ledbuf[3] = parm3%10;   				break; 				case 3:            ledbuf[0] = 0; 				  ledbuf[1] = 0; 				  ledbuf[2] = parm4/10; 				  ledbuf[3] = parm4%10;  				  break; 				default: break; 			} }