Raspberry Pico with Monochrome SH1106 Display Driver

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Raspberry Pico with Monochrome SH1106 Display Driver
Since I could not find any help with getting LVGL 9.2 up and running on a Raspberry Pico, I’ll share what I’ve gotten so far.

Repository: sdwood68/Pico_lvgl: Raspberry Pico with LVGL
Processor: RP2040
Display: Generic 128x64 monochrome OLED display with SH1106 chip and I2C interface
IDE: Visual Studio code 1.98.2
LVGL: v9.2
OS: None

What I’ve accomplished:

  • I’m able to display “Hello World”

To Do:

  • Add button scanning routine to control UI
  • Develop a basic UI
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Thank you for sharing it!

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Can’t figure out how to edit the first post to update my progress, so I’m adding it in the replies.

What I’ve accomplished:

  • Custom font for better look on the display
  • LVGL Menu with a title and 5 menu items.
  • Event call back for the menu allows scrolling through the menu items with up / down arrow keys.
  • Values associated with each item can be changed with the right / left arrow key.
  • Dynamically update the menu items label as the values change.

To Do

  • Learn how to use styles better.
    • Instead of the default style for a focused item in the menu that inverts the background color and text. I want it to just place a box with rounded corners around the focused item.
  • Add a default screen that has two vales that can be updated with the up/down keys for one and left/right keys for the other.
  • Enter the parameter menu on long press of the enter key.
1 Like
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Hello, very sorry to use this thread to solicit some advice but I am very stuck. I regard myself as a sophisticated LVGL user and have used it in many displays. I write my own drivers and I am certain that my SPI driver is fine as I can send any colour and image Iike and it works (outside LVGL that is). My problems started with a switch to 9.2 and I have been struggling for weeks. I use RGB888, not 565, and I am told that px_map is a simple one dimensional array of uint8_t pixel data. It isn’t that. LVGL renders whatever simple objects or just colours as a header of 0xFF followed by bytes unrelated to the objects I call. I have enabled RGB888 in the lv_conf (of course) but can not see in the lv_conf template anything else I need to change but I am sure the problem is in there somewhere. The forum is of little help as everyone seems to use 565 and not 888. Sorry to impose like this, but I have had lots of success with LVGL and am trying to get 9.2 working. Thank you

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Hey,
What is the value of LV_COLOR_DEPTH? If you set it to 24 the default color format will be RGB888.

Please also carefully read this migration guide as there are some driver related changes in v9.

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Hello,
Very many thanks indeed, I much appreciate your time. I have used LVGL for years and I understand the requirements for RGB888 and I set that at the very start. I have fixed it, but I don’t know how! In despair I just removed random chunks of lv_conf and it suddenly worked. px_map went from a long header of OxFF followed by strange bytes to exactly the array of pixel data I was expecting. I ran a file diff to see the changes from my cut down lv_conf from the original (based on the lv_conf_template) so I can reproduce for future projects as LVGL is my graphics engine of choice. It was just the change to 9.2 which caused me a bit of confusion.
But many thanks again.

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Hmm, it’s interesting. Can you share what you have changed in lv_conf.h that made it work?

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Hello,
I shall do my best (but I was randomly fiddling with menuconfig - I use esp-idf as well)!
Thanks again

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Oh, I see. Maybe it’s ESP related

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Could be, and I use freeRTOS a lot as well. I just need to catch up with this project and get it put to bed but I will go back later and try and understand why px_map could be affected in either lv_conf or menuconfig (even though RGB888) was set from the start.
Very many thanks again for your time and interest.