[En-Nut-Discussion] Digital inpits on Ethernut 2.1

Ernst Stippl ernst at stippl.org
Mon Jul 2 20:18:07 CEST 2007

Hi Paolo!

First, check the obvious: Is the resistor+switch really connected to PD0?
This would be the 5th pin counting from the upper right end of the expansion
connector downwards, on the row which is near to the boards edge. (when the
board is place so that the rs232 etc connectors are facing towards you.
Did you setup PD0 in your software? How do you check for the signal level?
Do you use interrupts?
You could try a different pin and see if the behaviour changes or stays the
Try to change the pin our are connecting to but do NOT change the program. 



-----Ursprüngliche Nachricht-----
Von: en-nut-discussion-bounces at egnite.de
[mailto:en-nut-discussion-bounces at egnite.de] Im Auftrag von Paolo Corno
Gesendet: Montag, 02. Juli 2007 09:56
An: en-nut-discussion at egnite.de
Betreff: [En-Nut-Discussion] Digital inpits on Ethernut 2.1

I need to receive a trigger signal on Ethernut 2.1.
I made theis addressune port D as input and getting the PIND char.
I hort the pin 0 on port Dwith the +5V pin throuh a 1K Ohm Resistor and a
switch It works correctly till i leave the JTAG programmer attached. As far
as I detach it The signal is continuously received even if the switch is
Somebody can help me please?

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