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AN #131 - Pseudo Multitasking in Real Time Print
Pseudo Multitasking in Real Time

This application note was submitted by Andrzej Sablik


' Andrzej Sablik  e-mail: sablik@poczta.onet.pl
' This program implements the pseudo multitaslking in BASCOM ( Real-time )
' This example is offered on an "AS IS" ,but it is rather then the example of solution.
' You have alone to account for every task time.



$sim
$regfile = "8535DEF.DAT"
$crystal = 8000000


Config Timer0 = Timer , Prescale = 64
On Ovf0 Scheduler
Load Timer0 = 6 ' 2 ms sample
Enable Timer0
Start Timer0
Enable Interrupts

Dim T As Byte
Dim Flaga1 As Bit
Dim Flaga2 As Bit
Dim Flaga3 As Bit
'-------------------------------------------------------------------------------
Config Adc = Single , Prescaler = Auto
Start Adc

Dim A As Word
Dim B As Word
Dim C As Word

Dim Pos As Word



'-------------------------------------------------------------------------------
Task1
:


 
Incr A '*
 
Print " a= " ; A '* Sample 1 program
 
If A > 1000 Then A = 0  '*
 
'

'------------------------
If Flaga1 = 1 Then
 
Goto Task1
Elseif Flaga2 = 1 Then
 
Goto Task2
Else
 
Goto Task3
End If

'-------------------------------------------------------------------------------
Task2
:

 
Incr B '*
 
Print " b= " ; B '* Sample 2 program
 
If B > 1000 Then B = 0 '*

'------------------------
If Flaga1 = 1 Then
 
Goto Task1
Elseif Flaga2 = 1 Then
 
Goto Task2
Else
 
Goto Task3
End If

'-------------------------------------------------------------------------------
Task3
:

Incr C '*
Print " c= " ; C '* Sample 3 program
If C > 1000 Then C = 0 '*

'------------------------
If Flaga1 = 1 Then
 
Goto Task1
Elseif Flaga2 = 1 Then
 
Goto Task2
Else
 
Goto Task3
End If

'-------------------------------------------------------------------------------
Scheduler
:
 
Incr T

  
Reset Flaga1 : Reset Flaga2 : Reset Flaga3
 
If T = 2 Then Flaga1 = 1'for example task 1 starts if t=2 and ended if t=4
 
If T = 5 Then Flaga2 = 1
 
If T = 9 Then
 Flaga3
= 1 : T = 0
 
End If
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