This channel is already in use, continuing anyway.

[Bjoern2]

I'm getting the warning "This channel is already in use, continuing anyway." when trying to control the GPIOs, e.g. using the blink python script, to turn an LED on/off. Googling around, the suggestion is that this might happen if a previous program didn't exit cleanly. However, I get the above even after boot.

I am presently accessing the Raspberry Pi via serial terminal. Could that be the problem? However, I did try it without the serial terminal (running the blink script after boot), and it didn't seem to work. I'm in Kigali (Rwanda) at the moment, and don't have a screen to try this without serial terminal.

Any thoughts?

[DirkS]

Did you by any chance mix up the pin numbering?
It's easy to do this with GPIO numbers and physical pin numbers.

Can you post your code?

Gr.
Dirk.

[Bjoern2]

Hi Dirk,

I used a "pi leaf", so used GPIO pins according to that.

Bjoern

[joan]

Hi Dirk,

I used a "pi leaf", so used GPIO pins according to that.

Bjoern

What is a "pi leaf"? Can you point to some documentation?

[DougieLawson]

Hi Dirk,

I used a "pi leaf", so used GPIO pins according to that.

Bjoern

Like this: http://www.raspberrypi.org/raspberry-leaf/ (for A/B)
Or like this: http://rasp.io/portsplus2/ (for A+/B+)

But how are you numbering the pins in your programs? Each pin has three or four names.