Simple Scheduler

Copyright (c) 2003 Atmel

Library Usage

Package Description

Overview

Configuration

In config.h:

1/ SCHEDULER_TYPE (required)
SCHEDULER_FREE: free running (max perfs, none constrainst)
SCHEDULER_TIMED: a semaphore is used to activate a new schedule (for instance all the tasks are executed each ms)
SCHEDULER_TASK: a semaphore is used between each task (for instance each task is executed each ms)
SCHEDULER_CUSTOM: custom, it is possible to define another scheduler type

2/ Scheduler_task_x_init (optional, except Scheduler_task_1_init)
x from 1 to 9, defines the init functions (init of task or general purpose init)

3/ Scheduler_task_x (optional, except Scheduler_task_1)
x from 1 to 9, defines the task functions

4/ Scheduler_time_init (optional)
defines the function that will be called to initialize time events: soft timers, tempo...

5/ SCHEDULER_ENABLE_IT (optional)
allow to enable interrupts after all initializations

6/ '#define scheduler main' (optional)
if the main is only a call to the scheduler

EXAMPLE
-------
|
|// File: config.h
|#define Scheduler_time_init     init_soft_timers
|
|#define Scheduler_task_1_init   twi_lib_init
|#define Scheduler_task_2_init   init_leds_task
|#define Scheduler_task_3_init   stdo_init
|#define Scheduler_task_4_init   init_main_task
|#define Scheduler_task_5_init   stdi_init
|
|#define Scheduler_task_1        leds_task
|#define Scheduler_task_3        main_task
|#define Scheduler_task_4        stdi_update_kbhit
|
|#define SCHEDULER_TYPE          SCHEDULER_FREE
|

// File: scheduler.c / scheduler.h (after precompiler)
void scheduler_init (void)
{
init_soft_timers();
twi_lib_init();
init_leds_task();
stdo_init();
init_main_task();
stdi_init();
;
}


void scheduler_tasks (void)
{
scheduler_empty_fct();
for(;;)
{
leds_task();
;
main_task();
;
stdi_update_kbhit();
;
;
}
}


void scheduler (void)
{
scheduler_init();
scheduler_tasks();
}


void scheduler_empty_fct (void)
{
}

Package Summary

Constants

Global Variables

scheduler_tick_flag 

Macros

Functions

scheduler 
scheduler_empty_fct 
scheduler_init 
scheduler_tasks 

Files List

• scheduler.c
  
This file contains the scheduler routines NOTES: Configuration: - SCHEDULER_TYPE in scheduler.h header file - Task & init for at least task number 1 must be defined
• scheduler.h
  
This file contains the scheduler definition and the task function to be executed by the scheduler NOTE: SCHEDULER_TICK & FPER are defined in config.h

Included Files

• config.h" / * system definition * /
  
• intrins.h
  
• lib_mcu\timer\timer_drv.h" / * timer definition * /
  
• scheduler.h" / * scheduler definition * /
  

Constant Macros

Global Variables

scheduler_tick_flag

bit   scheduler_tick_flag 

When SCHEDULER_TYPE != SCHEDULER_FREE, this flag control task calls.

Function Macros

Functions

scheduler

void scheduler  ( void )  

Simply call this task to init & run the scheduler

* return:

scheduler_empty_fct

void scheduler_empty_fct  ( void )  

This function does nothing

* return:

scheduler_init

void scheduler_init  ( void )  

Scheduler initialization

* return:

Note

Task_x_init() and Task_x_fct() are defined in config.h

scheduler_tasks

void scheduler_tasks  ( void )  

Task execution scheduler

* return: