3 replies to this topic

[JeroenG]

Hi

I use netduino plus

Which I/O pins are compatible for multi threading.
I have a problem with multithreading.

 

Code:

Imports Microsoft.SPOT

Imports Microsoft.SPOT.Hardware

Imports SecretLabs.NETMF.Hardware

Imports SecretLabs.NETMF.Hardware.NetduinoPlus

Module Module1

Dim button As New InputPort(Pins.ONBOARD_SW1, False, Port.ResistorMode.Disabled)

Dim Sensor As New InputPort(Pins.GPIO_PIN_D0, False, Port.ResistorMode.Disabled)

Dim Motor As New OutputPort(Pins.GPIO_PIN_D1, False)

Dim StepMotor As New OutputPort(Pins.GPIO_PIN_D2, False)

Dim tMotor As New Thread(AddressOf RotateMotor)

Dim tStepMotor As New Thread(AddressOf RotateStepMotor)

Sub Main()

' write your code here

tMotor.Start()

tStepMotor.Start()

Do

 

Loop

 

End Sub

 

Sub RotateMotor()

If button.Read = True Then

Do

Motor.Write(True)

Thread.Sleep(1)

Motor.Write(False)

Thread.Sleep(63)

Loop Until buton.Read = False

End If

End Sub

 

Sub RotateStepMotor()

If Sensor.Read = True Then

Do

StepMotor.Write(True)

Thread.Sleep(20)

StepMotor.Write(False)

Thread.Sleep(20)

Loop Until Sensor.Read = False

End If

End Sub

 

End Module

 

 

[color=rgb(0,0,0);]If sensor is active then all is OK.[/color]

 

[color=rgb(0,0,0);]If button is active then all is OK.[/color]

[color=rgb(0,0,0);] [/color]

[color=rgb(0,0,0);]If button and sensor are active then everything is not OK.[/color]

[color=rgb(0,0,0);] [/color]

The output signal of Motor is the same as the output signal of Stepmotor.

What is wrong?

 

Thanks
 

 

 

 

[hanzibal]

Hi! Start by removing the do...loop in Sub Main, instead use Thread.Sleep(Timeout.Infinite). Next, both your threads will exit as soon as sensor and button reads true respectively. Once a thread exits its method, it stops running and won't get called again per se. Therefore, replace the "loop untill..." with just "loop" in each of the corresponding methods and it should work better. Better still would be for you to declare both sensor and button as Interrupt ports and then use the interrupt to turn motor rotation on and off depending the edge being high or low.

[JeroenG]

Thanks

 

I will try tomorrow.  

[hanzibal]

I forgot to say earlier; move the if block to inside the do...loop for both threads.