Support for 64x48 OLED Display

[csskevin]

Hello,
Would it be possible to add a support for a 64x48 OLED display. I do not have much experience here. Can I add it manual?
Thanks

[thijstriemstra]

@csskevin do you have a link to the ebay/product page and/or datasheet of the device?

[csskevin]

Bought it through amazon. The contributer link https://www.wemos.cc/product/oled-shield.html

[thijstriemstra]

Have you tested it with the luma.examples? Can you try this command:

python examples/starfield.py --display ssd1306 --width 64 --height 48 --interface i2c

[csskevin]

There I get following error:
starfield.py: error: Unsupported display mode: 64 x 48

[rm-hull]

The good news is that it should work with a small fix, but presently won't work as-is. The device only supports certain modes - see https://github.com/rm-hull/luma.oled/blob/master/luma/oled/device.py#L124-L129

To make it work we would need to find out the correct values for the multiplex and clock divider, and add an entry like:

(64, 48): dict(multiplex=???, displayclockdiv=???, compins=???)

@csskevin I will have a look at the datasheet and see if we can suggest some values for you to try, how does that sound?

[thijstriemstra]

ok. start a python console:

$ python

And type:

from luma.oled import device
device

This should print the path of the oled module, e.g.

>>> from luma.oled import device
>>> device
<module 'luma.oled.device' from '/home/me/projects/bar/src/luma.oled/luma/oled/device.py'>
>>> 

Now open /home/me/projects/bar/src/luma.oled/luma/oled/device.py with a text editor
and look for:

# Supported modes
settings = {
    (128, 64): dict(multiplex=0x3F, displayclockdiv=0x80, compins=0x12),
    (128, 32): dict(multiplex=0x1F, displayclockdiv=0x80, compins=0x02),
    (96, 16): dict(multiplex=0x0F, displayclockdiv=0x60, compins=0x02)
}.get((width, height))

Change this so it looks like:

# Supported modes
settings = {
    (128, 64): dict(multiplex=0x3F, displayclockdiv=0x80, compins=0x12),
    (128, 32): dict(multiplex=0x1F, displayclockdiv=0x80, compins=0x02),
    (96, 16): dict(multiplex=0x0F, displayclockdiv=0x60, compins=0x02),
    (64, 48): dict(multiplex=0x0F, displayclockdiv=0x60, compins=0x02)
}.get((width, height))

And try again.. (@rm-hull this is safe to do right? :)

[csskevin]

@rm-hull This would sound perfect. Thanks very much

@thijstriemstra Thank you, the 64 x 48 width and height works, but the dimensions are not working properly. I see just a part. (I see a part from right top I think)

[thijstriemstra]

@csskevin can you post a picture?

[csskevin]

Sorry fot the bad image quality. I started the demo.py, because on the startfield.py I see just dots.

[thijstriemstra]

no worries, thanks for posting. Hopefully @rm-hull can find the correct values for that line and it should be working ok.

[csskevin]

Thank you both very much and thanks for the fast help.

[rm-hull]

Try:

(64, 48): dict(multiplex=0x2F, displayclockdiv=0x80, compins=0x12)

If you are going to test it, please use

$ python examples/demo.py --display ssd1306 --width 64 --height 48 --interface i2c

It should look like this:

You can't tell from the screengrab but there should be white outline around the shapes

[csskevin]

Thank you it got better

[rm-hull]

Can you alter your local copy of https://github.com/rm-hull/luma.oled/blob/master/luma/oled/device.py#L171 to read:

self._const.COLUMNADDR, 0x20, 0x5F,

See what happens?

[csskevin]

Thank you very very much, it works perfectly now

[rm-hull]

Ok, so thats great. I'll roll out a fix for the general case, but I dont think we ever tested it for a 96x16 device - did you @thijstriemstra ? I suspect that never worked properly for the same reason the 64x48 didnt .. :-s

[rm-hull]

See rm-hull/luma.oled#144

[thijstriemstra]

I couldn't find the ticket for 96x16 other than a really old one that relates to the previous codebase, so I think you're right @rm-hull.

[thijstriemstra]

Smallest OLED I tested: rm-hull/luma.oled#23 (128x32)

[rm-hull]

@csskevin can you upgrade to luma.oled 2.2.6 please and let me know if that fixes it for you? use sudo -H pip install --upgrade luma.oled

If so please close the ticket :-)

[csskevin]

Thanks for your great support. It works perfectly :) 👍