A Small Multi-Tasking Operation System Using 8051: led.c Source File

00001 /**************************************************
00002 * led driver
00003 * Function: Driver for led display
00004 *           
00005 * File:    led.c
00006 * Author:  Book Chen
00007 * 2008.08.08 
00008 ****************************************************
00009 */
00010 #include "..\inc\includes.h"
00011 #include "..\os_core\os_includes.h"
00012 
00013 #define Led0OnState 0
00014 #define Led1OnState 1
00015 #define Led2OnState 2
00016 #define Led3OnState 3
00017 
00018 #define cLedOn  0
00019 #define cLedOff 1
00020 
00021 sbit Led0=P1^4;
00022 sbit Led1=P1^5;
00023 sbit Led2=P1^6;
00024 sbit Led3=P1^7;
00025 
00026 struct LED_CONTROL LedCtrl;
00027 void F_LedPowerOnInit(void) LargeReentrant;
00028 void F_LedSvc(void) LargeReentrant;
00029 
00030 void F_LedPowerOnInit(void) LargeReentrant{ 
00031     LedCtrl.State=Led0OnState;
00032     LedCtrl.Timer=100;
00033 } 
00034 void F_LedSvc(void) LargeReentrant{
00035         LedCtrl.Timer=20;
00036         LedCtrl.State++;
00037         if(LedCtrl.State>3) LedCtrl.State=0;
00038         switch(LedCtrl.State){
00039             case Led0OnState:
00040                 Led0=cLedOn;
00041                 Led1=cLedOff;
00042                 Led2=cLedOff;
00043                 Led3=cLedOff;
00044                 break;
00045             case Led1OnState:           
00046                 Led0=cLedOff;
00047                 Led1=cLedOn;
00048                 Led2=cLedOff;
00049                 Led3=cLedOff;
00050                 break;
00051             case Led2OnState:           
00052                 Led0=cLedOff;
00053                 Led1=cLedOff;
00054                 Led2=cLedOn;
00055                 Led3=cLedOff;        
00056                 break;
00057             case Led3OnState:           
00058                 Led0=cLedOff;
00059                 Led1=cLedOff;
00060                 Led2=cLedOff;
00061                 Led3=cLedOn;
00062                 break;
00063             default:
00064                 break;
00065         }    
00066 }
00067