Velleman-projects EDU05 Assembly instructions Bedienungsanleitung PDF herunterladen (Seite 15)

EDU05 Test procedure & programming in Visual Basic 2010 ( Version 1.0)

To read the status of the buttons you can use the function

ReadAllDigital().

This function returns a 32 bit integer.

The eight lowest bits of this return value represent the status of the eight buttons. If you press a button, the

corresponding bit is set to "1".

You can use Visual Basic's

And

operator to mask the other bits and check the value of an individual bit.

Example: If buttons SW1, SW2 and SW8 are pressed, the eight last bits of the value are 10000011.

In this code example the button status value is read to integer i.

Every bit is checked if it is "1" or "0". If the bit is "1", it means the corresponding switch is pressed. The text

"DOWN" is displayed for this button

Dim i As Integer

i = ReadAllDigital()

' check the individual bits of i to detect the pressed buttons

If (i And 1) > 0 Then Label3.Text = "SW1 = Pressed" Else Label3.Text = "SW1 = Released"

If (i And 2) > 0 Then Label4.Text = "SW2 = Pressed" Else Label4.Text = "SW2 = Released"

If (i And 4) > 0 Then Label5.Text = "SW3 = Pressed" Else Label5.Text = "SW3 = Released"

If (i And 8) > 0 Then Label6.Text = "SW4 = Pressed" Else Label6.Text = "SW4 = Released"

If (i And 16) > 0 Then Label7.Text = "SW5 = Pressed" Else Label7.Text = "SW5 = Released"

If (i And 32) > 0 Then Label8.Text = "SW6 = Pressed" Else Label8.Text = "SW6 = Released"

If (i And 64) > 0 Then Label9.Text = "SW7 = Pressed" Else Label9.Text = "SW7 = Released"

If (i

And 128

) > 0 Then Label10.Text = "SW8 = Pressed" Else Label10.Text = "SW8 = Released"

STEP11

When you are finished evaluating this project, you can close it. Next, open the project Set_LED to study how to turn

LEDs on and off on the EDU05 board.

Velleman NV

Legen Heirweg 33

9890 Gavere, Belgium

www.velleman.eu

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Velleman-projects EDU05 Assembly instructions Bedienungsanleitung Seite 15