ZBasic Forum

Posted: **15 March 2008, 18:24 PM**

I just got my ZX24A and I'm trying to work with an interrupt and multitasking.

My test code is below. First I'm a beginner but I'm trying to hook up a flow meter to the ZX. This little test runs (StatusTask=3) and then terminates fine (StatusTask=255). My question is how do I restart the task so it can start watching the interrupt again once it terminates?

For my project I need to see when the interrupt fires and count the pulses or transitions on that pin (code not in place yet). Once I have the pulse count I want to restart the task but I'm unsure how to do that. I've tried to CallTask again when the StatusTask=255 in the loop but it still remains terminated.

Thanks
David

Code: Select all

Dim SerTaskStack&#40;1 to 40&#41; As Byte
Sub Main&#40;&#41;
	CallTask "TaskTest",SerTaskStack
	
	Do
	Debug.Print Cstr&#40;StatusTask&#40;SerTaskStack&#41;&#41;
	Delay&#40;2.0&#41;
	Loop
	
End Sub


Sub TaskTest&#40;&#41;
	Call WaitForInterrupt&#40;&h1c, 0&#41;
	'Later code will go here to count
	'pulses or transitions
	Debug.Print "Task ran"
End Sub

Posted: **15 March 2008, 19:05 PM**

super-d wrote:My question is how do I restart the task so it can start watching the interrupt again once it terminates?

A commonly used strategy is to not let it terminate by adding an infinite loop to the task.

Code: Select all

Sub TaskTest&#40;&#41; 
  Do
    Call WaitForInterrupt&#40;&h1c, 0&#41; 
    'Later code will go here to count 
    'pulses or transitions 
    Debug.Print "Task ran" 
  Loop
End Sub

ZBasic Forum

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