Raspberry Pi Forums

Posted: **Wed Aug 02, 2017 3:27 pm**

I have a script ~/scripts/pins.py which controls some GPIO pins using RPi.GPIO

I found an oled display to add to my project which I'm connecting w/ i2c. I found a python library from adafruit..
https://github.com/adafruit/Adafruit_Python_SSD1306

I can run the examples from ~/Adafruit_Python_SSD1306/examples and it works.

Now, I'd like to write to the display from my original ~/scripts/pins.py script..
- I tried to copy the ONLY the "Adafruit_SSD1306" folder into my ~/scripts folder.
- I get the error that Adafruit GPIO is set to a differnet mode (I use Board mode)
- I found the following lines..

Code: Select all

  # Default to platform GPIO if not provided.
 self._gpio = gpio
 if self._gpio is None:
       self._gpio = GPIO.get_platform_gpio()

- I can't figure out where the GPIO.get_platform_gpio() function lives. ( where the Adafruit library is setting the GPIO mode at)??
- I see this "import Adafruit_GPIO as GPIO" but cannot find the script anywhere to adjust/make changes. Is it downloading it online somewhere?

If I comment out the lines above the display works with my script. Does this mean w/ i2c that it's not really using the GPIO?

Posted: **Wed Aug 02, 2017 4:00 pm**

The Adafruit_Python_GPIO library can be found here.

Installing the Adafruit_Python_SSD1306 library should install the GPIO library by default but I'm guessing you didn't install it, just copied and pasted.
Installing python libraries places them in a common location for all python scripts and is commonly controlled via the setup.py file that comes with many libraries.

Posted: **Wed Aug 02, 2017 4:21 pm**

Actually, I did install it using sudo python setup.py install. I get this folder afterwards..
Adafruit_SSD1306.egg-info ... which has
PKG-INFO, SOURCES.txt, dependency_links.txt, requires.txt, top_level.txt

dependency_links.txt has this..
https://github.com/adafruit/Adafruit_Py ... GPIO-0.6.5

I cant find the file anywhere?? I think it is finding it somehwere because if I uncomment the lines i get the error so it's finding Adafruit_GPIO somewhere.

Posted: **Wed Aug 02, 2017 7:58 pm**

Hi

If you are getting this error "- I get the error that Adafruit GPIO is set to a differnet mode (I use Board mode)"
then why don't you change your script so that it uses BCM mode then it will match the adafruit library you are importing.

I have often found when working with imported libraries that you have to adapt to the GPIO mode they are using.

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Adafruit Python library and basic python structure help

Adafruit Python library and basic python structure help

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Re: Adafruit Python library and basic python structure help

Re: Adafruit Python library and basic python structure help