LVGL sample on a RAYTAC MDBT50Q

RE: LVGL sample on a RAYTAC MDBT50Q

helsing — Fri, 31 Jan 2025 15:24:01 GMT

Hi Michael, sorry for the delay.

[quote user="mej7000"]That said, I expected that by using "nrf52840dk_nrf52840" it would work on the RAYTAC as long as the same pins were used on both the nrf52840dk and the RAYTAC. Is that a good assumption or am I missing something?[/quote]

Using the board files from a different board should be done with care as it is not always easy to see how the project/application is dependant on a specific board. Differences could be for example be enabled/disabled DC/DC or external clock etc. It could also be variations regarding which pins are used for logging and various interfaces.

[quote user="mej7000"]I ran into problems because the waveshare used the arduino_spi definition and the Raytac didn't define arduino_spi...[/quote]

It should not be too much work to adapt the Ractac boardfiles for arduino_spi definitions. Here is an older guide for how to fix missing arduino lables. The post was written at a time when nRF9160DK did not have the arduino definitions yet. Things have changed since then, so I am not sure which parts are relevant. Please let me know if you are still stuck at this and I coud try next week to set up an example and see whether it builds.

RE: LVGL sample on a RAYTAC MDBT50Q

mej7000 — Thu, 09 Jan 2025 19:02:18 GMT

I tried that after making this posting. Ultimately it didn't make any difference.

I ran into problems because the waveshare used the arduino_spi definition and the Raytac didn't define arduino_spi... Zephyr is relatively new to me, but I modified the waveshare_epaper_gdey0213b74.overlay file to use spi1 and test it on the RAYTAC.

As best as I could tell I modified waveshare_epaper_gdey0213b74.overlay correctly because I was testing the pin allocation changes on the nrf52840dk and nrf52840dk continued to work after being rewired.

That said, I expected that by using "nrf52840dk_nrf52840" it would work on the RAYTAC as long as the same pins were used on both the nrf52840dk and the RAYTAC. Is that a good assumption or am I missing something?

After this posting I used this same: west build -b nrf52840dk_nrf52840 -d build52840 -p -- -DSHIELD=waveshare_epaper_gdey0213b74 on a custom pcb with a Fanstel module and got that display to work using the same arduino_spi default pins.

I would think there might be something off about the RAYTAC dev board, but once I pull the "spi reset" pin led0 starts flashing as expected, so something strange is happening that seems to be related to spi.

RE: LVGL sample on a RAYTAC MDBT50Q

helsing — Thu, 09 Jan 2025 12:31:58 GMT

Hi Michael,

[quote user=""]command for both: west build -b nrf52840dk_nrf52840 -d build52840 -p -- -DSHIELD=waveshare_epaper_gdey0213b74[/quote]

I see from the images that you are using MDBT50Q-DB-40. Have you tried building for raytac_mdbt50q_db_40/nrf52840 ?