Example at ...\ncs\v1.4.0\zephyr\samples\drivers\display does not work with SSD1306 wired directly to nRF9160DK

[craig.stephan]

When I program the nrf9160dk with the example, the code detects the SSD1306, but the display looks like:

The image is only using the middle half (16 rows) of the display that has 32 rows and 128 columns. 

And the left side of the image is a random set of pixels.

What can I do to get the example to give me text on the screen?

I am using the SSD1306 OLED at: https://www.amazon.com/Pieces-Display-Module-SSD1306-3-3V-5V/dp/B08CDN5PSJ/ref=sr_1_8?dchild=1&keywords=ssd1306&qid=1606702037&sr=8-8

Do I have to modify any of the files to target the nRF9160 instead of the nRF52 family?

[helsing]

Hi Craig,

I will look into your issue, but to understand it better I need a bit more info:

How is your display wired up to your DK?

Are you able to display text or characters to the middle half?

I am working from home today, however, I plan to visit our office on Thursday. Hopefully be able to find a SSD1306 at the office so that I can test a few things.

Best regards,

Håkon

[craig.stephan]

Hi Håkon,

I have the SSD1306 OLED display wired directly to the nRF9160DK as follows:

1. SDA: P0.30
2. SCL: P0.31
3. GND: GND
4. VCC: VDD (switch on DK is set to make VDD=3.3V)

I have had no success in displaying legible characters on any part of the display with the nRF9160DK. I am interested in reliably displaying series of16-pixel/24-pixel high characters on the display. Scrolling and displaying graphics would be nice, but not essential.

The SSD1306 display that I am using is 128 pixels wide by 32 pixels high.

Regards,

Craig

[helsing]

Hi Craig,

Thank you for the update.

Looking at your image it looks like the resolution is somehow not set correctly. Is there any chance that the project is configured somewhere for 64 pixels, instead of 32? Would you be able to share your project files?

I had a brief look at your previous case regarding the display. I noticed that in the recommend code for the CMakeLists.txt, the height was set to 64:   height = <64>;

Best regards,

Håkon

[craig.stephan]

The files are attached here. Is the existence of the sample.yaml file in my directory causing the example to not work because it was written for the nrf52840dk_nrf52840? Does the sample.yaml need to be modified/replaced?

  nrf9160dk_nrf9160ns.zip

[helsing]

Thank you for the project files, I will look into them tomorrow morning(CEST).

Best regards,

Håkon

[helsing]

Hi Craig,

I have not yet been able to test anything on the display, but hopefully I will be able to do so on Tuesday.

I have had a look at the datasheet for the SSD1306 OLED driver and found a few things worth investigating.

I will get back to you next week.

Best regards,

Håkon

[helsing]

I have now finally a similar display in front of me and I will try out a few things.

I also found another issue related to this board and this specific display that was very recently solved. The display driver is mentioned in the release notes : Changes in nRF Connect SDK v1.4.99: "Enhanced the SSD1306 driver to support communication via both SPI and I2C."

You may want to check out nRF Connect SDK v1.4.99-dev1. I will look into it myself next week.