A Small Control System Using 8051: led.c Source File

00001 /**************************************************
00002 * Function: Driver for led display
00003 *           
00004 * File:    led.c
00005 * Author:  Book Chen
00006 * 2008.08.08 
00007 ****************************************************
00008 */
00009 #include "..\inc\includes.h"
00010 
00011 #define Led0OnState 0
00012 #define Led1OnState 1
00013 #define Led2OnState 2
00014 #define Led3OnState 3
00015 
00016 #define cLedOn  0
00017 #define cLedOff 1
00018 
00019 sbit Led0=P1^4;
00020 sbit Led1=P1^5;
00021 sbit Led2=P1^6;
00022 sbit Led3=P1^7;
00023 
00024 struct LED_CONTROL LedCtrl;
00025 void F_LedPowerOnInit(void) LargeReentrant;
00026 void F_LedSvc(void) LargeReentrant;
00027 
00028 void F_LedPowerOnInit(void) LargeReentrant{ 
00029     LedCtrl.State=Led0OnState;
00030     LedCtrl.Timer=100;
00031 } 
00032 void F_LedSvc(void) LargeReentrant{
00033         if(LedCtrl.Timer!=0) return;
00034         LedCtrl.Timer=200;
00035         LedCtrl.State++;
00036         if(LedCtrl.State>3) LedCtrl.State=0;
00037         switch(LedCtrl.State){
00038             case Led0OnState:
00039                 Led0=cLedOn;
00040                 Led1=cLedOff;
00041                 Led2=cLedOff;
00042                 Led3=cLedOff;
00043                 break;
00044             case Led1OnState:           
00045                 Led0=cLedOff;
00046                 Led1=cLedOn;
00047                 Led2=cLedOff;
00048                 Led3=cLedOff;
00049                 break;
00050             case Led2OnState:           
00051                 Led0=cLedOff;
00052                 Led1=cLedOff;
00053                 Led2=cLedOn;
00054                 Led3=cLedOff;        
00055                 break;
00056             case Led3OnState:           
00057                 Led0=cLedOff;
00058                 Led1=cLedOff;
00059                 Led2=cLedOff;
00060                 Led3=cLedOn;
00061                 break;
00062             default:
00063                 break;
00064         }    
00065 }
00066