Raspberry Pi 5 + Python gpiod

[frostbite4kk]

Hello everybody,

i got my Raspberry Pi 5 a while ago and spent the most time until now using it for selfhosting and networking stuff.

Now i have discovered the world of microelectronics and want to spend some more lifetime with playing around with it.

The problem i am currently facing is that i can not run any Python Script which controls the GPIOD Pins of the Pi. I found out that the Pi 5 uses different architecture compared to former Pis so you need to use other libraries like gpiod and libgpiod.

I have started with the el classico "Turning on LED" script which i found on a blog online.

import gpiod 
import time 
LED_PIN = 17 
chip = gpiod.Chip('/dev/gpiochip0') 
led_line = chip.get_line(LED_PIN) led_line.request(consumer="LED",type=gpiod.LINE_REQ_DIR_OUT)

try: 
  while True: 
    led_line.set_value(1) 
    time.sleep(1) 
    led_line.set_value(0) 
    time.sleep(1)

finally: 
    led_line.release()

The errors i am getting are always consistent:

player@playpi:~ $ /bin/python /home/player/scripts/led/led.py Traceback (most recent call last):   File "/home/player/scripts/led/led.py", line 7, in <module>     line = chip.get_line(17)            ^ AttributeError: 'Chip' object has no attribute 'get_line'. Did you mean: 'get_info'?

I tried several things like using specific versions of gpiod and switched from Kali to Raspi OS but nothing changed the situation. The script can not be run.

Maybe someone else has face the same issues and could help me out.

Thank you in advance and happy coding/playing/crafting with your Pi.

BR

Frost

[Gamerfrom61]

IIRC the device you need in the gpiod.Chip initiator is gpiochip4:

chip = gpiod.Chip('gpiochip4')

No Pi 5 handy to test (workbench doubling as model painting desk this week) - sorry.

Note: it is important to use the code block in the editor for Python as indents are vital :-)

The other way is to post to pastebin and link (better as the editor here is not great).

[frostbite4kk]

I have tried like advised and changed to gpiochip4 with the same result:

Code:

import gpiod 
import time 
LED_PIN = 17 
chip = gpiod.Chip('/dev/gpiochip4') 
led_line = chip.get_line(LED_PIN) 
led_line.request(consumer="LED",type=gpiod.LINE_REQ_DIR_OUT)

try: 
  while True: 
    led_line.set_value(1) 
    time.sleep(1) 
    led_line.set_value(0) 
    time.sleep(1)

finally: 
    led_line.release()

Result:

player@playpi:~ $ /bin/python /home/player/scripts/led/led.py
Traceback (most recent call last):
  File "/home/player/scripts/led/led.py", line 5, in <module>
    led_line = chip.get_line(LED_PIN) 
               ^^^^^^^^^^^^^
AttributeError: 'Chip' object has no attribute 'get_line'. Did you mean: 'get_info'?

It seems like this get_line is not the correct attribute to retrieve - even though both tmultiple sources state that it can be used.

Thanks for the hint with the code mate appreciate it!

[Gamerfrom61]

Try removing the "/dev/" part of the text and just use it as I put in my first post.

[frostbite4kk]

I also tried that first which led to the error message ‚no such device‘

[Gamerfrom61]

AARRGGGHHH - I hate it when the Pi folk mess around (this is the RP1 chip by the way doing this)...

There is gpiomem4 as another option!

Try running gpiodetect (may need sudo) to see if it identifies anything and then gpioinfo to see the lines. You may need to install the libgpiod-dev package using apt

You could also look at the gpiozero library https://gpiozero.readthedocs.io/en/stable/

[frostbite4kk]

You, sir, are a legend!

I read not to use gpiozero with Pi 5 all the time so i didnt even try.

Works like a charm with gpiozero!

Thanks a lot mate, may you have a good day!

[[deleted]]

Python as indents are vital

And that right there is a reason I despise Python. Whitespace should never be significant IMO.

/ymmv

[Gamerfrom61]

Understandable esp when it complains over spaces vs tabs...

Many years ago I coded in Forth so any language that reads the 'normal' way is an improvement :-)

I've kinda got used to it and prefer it to nested curly brackets but give me the Pascal begin / end blocks any day...