A Small Multi-Tasking Operation System Using 8051: os

00001 /**************************************************
00002 * Tasking kernel file
00003 * Function: Task management
00004 *
00005 * File:    os_task.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 OS_STACK OsTaskStack[MAX_TASK_NUM][TASK_STACK_SIZE];         // declare 10 task stacks
00014 OS_TCB  TaskTable[MAX_TASK_NUM];                             // declare task table for 10 tasks control
00015 struct OS_TASK_CONTROL OsTaskCtrl;
00016 void   OsTaskPowerOnInit(void)         LargeReentrant;
00017 INT8U  OsTaskCreat(void (*Task)(void)) LargeReentrant;                          
00018 
00019 void OsTaskPowerOnInit() LargeReentrant{
00020     OsTaskCtrl.TaskNum=0;
00021     OsTaskCtrl.CurTaskId=0;
00022     OsTaskCtrl.NextTaskId=0;  
00023 }
00024 INT8U OsTaskCreat(void (*Task)(void)) LargeReentrant{  
00025     if(OsTaskCtrl.TaskNum==MAX_TASK_NUM) return FALSE;       // No task space 
00026     TaskTable[OsTaskCtrl.TaskNum].Id=OsTaskCtrl.TaskNum;     // Initial task stack...grows from top to down 
00027     TaskTable[OsTaskCtrl.TaskNum].function=Task;             // Function address
00028     TaskTable[OsTaskCtrl.TaskNum].Stack=OsTaskStackInit(Task,(OS_STACK *)&OsTaskStack[OsTaskCtrl.TaskNum][TASK_STACK_SIZE-1]); 
00029     OsTaskCtrl.TaskNum++;
00030 }
00031