2 replies to this topic

[JeroenG]

Hi

 

I have an interrupt problem. When i use the onboard sw then is everything OK. But when i change (pins.ONBOARD_SW1 to pins.GPIO_PIN_D0) and i run it then the boolean bRedyToStart is not stable. The boolean changed from state af few times. I use my own button.

I connect the button with one side to the D0 pin and the other side of the button i connect with GND.

 

 

Code:

Dim swStartStop As New InterruptPort(Pins.ONBOARD_SW1, True, Port.ResistorMode.Disabled, Port.InterruptMode.InterruptEdgeLow)

 

AddHandler swStartStop.OnInterrupt, AddressOf StartMachine

 

Private Sub StartMachine(ByVal data1 As UInteger, ByVal data2 As UInteger, ByVal time As Date)

If bRedyToStart = False Then

bRedyToStart = True

buffer = encoding.GetBytes("H")

rs232.Write(buffer, 0, buffer.Length)

Thread.Sleep(1000)

 

Else

bRedyToStart = False

buffer = encoding.GetBytes("L")

rs232.Write(buffer, 0, buffer.Length)

Thread.Sleep(1000)

End If

End Sub

 

Thanks for help

[Chris Walker]

Hi JeroenG, 

 

In your InterruptPort constructor, you're turning off the pin's internal pullup with Port.ResistorMode.Disabled.

 

Try setting that to Port.ResistorMode.PullUp instead.  You've connected your button to ground so that it is driven LOW when you press it--but you need it to be weakly pulled HIGH by default.  That's what a pull-up does.

 

Does that help?

 

Chris

[JeroenG]

Hi Thyanks for help but it dont working. Is it possible that my hardware is connected properly? Do I need an external pull up resistor?