GPIO direction IN value always HIGH

Hi guys!

I have a GPIO configured MINI2440. Setting the pin 9 as output with
direction OUT works fine, I can change the value from 0 and 1, the
connected LED turns on and off. When I set the direction to IN, the value
sets automatically to HIGH and I can not change the value anymore - it
stays always HIGH.

I want to set the value to LOW(0), connect a button to the pin 9 and to the
+3.3V pin. When the button will be pressed, the voltage should be put on
the pin 9 and change the value to HIGH(1).

I will not use the user button connections on the connector 12.

What should I do, to read the button state from the GPIO pin 9?

Thanks a lot!

K.

Hi!

Is the pull-up function disabled for the GPIO pin?
If not, the value read from GPxDAT will be HIGH (1) when the pin is not
connected.

Hi,

how to disable the pull-up function for the GPIO pin?

Thanks,
Jeffrey

Read the datasheet, chapter "9 I/O Ports"