Task scheduler library  1.0
Arduino library for simply executing tasks in parallel
Tasks.cpp File Reference
#include "Tasks.h"

Go to the source code of this file.

Functions

void Tasks_Init (void)
 Initialize and reset the tasks library. More...
 
bool Tasks_Add (Task func, int16_t period, int16_t delay)
 Add a task to the task scheduler. More...
 
bool Tasks_Remove (Task func)
 Remove a task from the task scheduler. More...
 
bool Tasks_Delay (Task func, int16_t delay)
 Delay execution of a task. More...
 
bool Tasks_SetState (Task func, bool state)
 Enable or disable the execution of a task. More...
 
void Tasks_Start (void)
 Start the task scheduler. More...
 
void Tasks_Pause (void)
 Pause the task scheduler. More...
 

Detailed Description

Library providing a simple task scheduler for multitasking.

For more details please refer to Tasks.h

Definition in file Tasks.cpp.

Function Documentation

bool Tasks_Add ( Task  func,
int16_t  period,
int16_t  delay = 0 
)

Add a task to the task scheduler.

A new task is added to the scheduler with a given execution period and delay until first execution.
If no delay is given the task is executed at once or after starting the task scheduler (see Tasks_Start())
If a period of 0ms is given, the task is executed only once and then removed automatically.
To avoid ambiguities, a function can only be added once to the scheduler. Trying to add it a second time will reset and overwrite the settings of the existing task.

Used HW blocks:
- Arduino ATMega: TIMER0_COMPA_vect
- Arduino SAM: TC3

Parameters
[in]funcFunction to be executed.
The function prototype should be similar to this: "void userFunction(void)"
[in]periodExecution period of the task in ms (0 to 32767)
[in]delayDelay until first execution of task in ms (0 to 32767)
Returns
true in case of success, false in case of failure (max. number of tasks reached, or duplicate function)
Note
The maximum number of tasks is defined as MAX_TASK_CNT in file Tasks.h

Definition at line 169 of file Tasks.cpp.

bool Tasks_Delay ( Task  func,
int16_t  delay 
)

Delay execution of a task.

The task is delayed starting from the last 1ms timer tick which means the delay time is accurate to -1ms to 0ms.
This overwrites any previously set delay setting for this task and thus even allows earlier execution of a task. Delaying the task by <2ms forces it to be executed during the next 1ms timer tick. This means that the task might be called at any time anyway in case it was added multiple times to the task scheduler.

Used HW blocks:
- Arduino ATMega: TIMER0_COMPA_vect
- Arduino SAM: TC3

Parameters
[in]funcFunction that should be delayed
[in]delayDelay in ms (0 to 32767)
Returns
true in case of success, false in case of failure (e.g. function not in not in scheduler table)

Definition at line 316 of file Tasks.cpp.

void Tasks_Init ( void  )

Initialize and reset the tasks library.

This function initializes the task scheduler and related timer.

Used HW blocks:
- Arduino ATMega: TIMER0_COMPA_vect
- Arduino SAM: TC3

Definition at line 140 of file Tasks.cpp.

void Tasks_Pause ( void  )

Pause the task scheduler.

Pause execution of the scheduler. All tasks are paused.

Used HW blocks:
- Arduino ATMega: TIMER0_COMPA_vect
- Arduino SAM: TC3

Definition at line 438 of file Tasks.cpp.

bool Tasks_Remove ( Task  func)

Remove a task from the task scheduler.

Remove the specified task from the scheduler and free the slot again.

Used HW blocks:
- Arduino ATMega: TIMER0_COMPA_vect
- Arduino SAM: TC3

Parameters
[in]funcFunction name that should be removed.
Returns
true in case of success, false in case of failure (e.g. function not in not in scheduler table)

Definition at line 257 of file Tasks.cpp.

bool Tasks_SetState ( Task  func,
bool  state 
)

Enable or disable the execution of a task.

Temporary pause or resume function for execution of single tasks by scheduler. This will not stop the task in case it is currently being executed but just prevents the task from being executed again in case its state is set to 'false' (inactive).

Used HW blocks:
- Arduino ATMega: TIMER0_COMPA_vect
- Arduino SAM: TC3

Parameters
[in]funcFunction to be paused/resumed.
The function prototype should be similar to this: "void userFunction(void)"
[in]stateNew function state (false=pause, true=resume)
Returns
'true' in case of success, else 'false' (e.g. function not in not in scheduler table)

Definition at line 370 of file Tasks.cpp.

void Tasks_Start ( void  )

Start the task scheduler.

Resume execution of the scheduler. All active tasks are resumed.

Used HW blocks:
- Arduino ATMega: TIMER0_COMPA_vect
- Arduino SAM: TC3

Definition at line 412 of file Tasks.cpp.