Inkplate partialUpdate flicker in GREYSCALE mode vs BW

TECHNICAL SUPPORT Inkplate
1

Customer:

I have a question about the difference in how partialUpdate works between BW and GREYSCALE modes. There’s flicker in greyscale mode but not in black/white mode. Is it theoretically possible to do partial updates so that existing content isn’t flickering? The BW mode seems to send a delta update per pixel. Could the same be achieved for greyscale?

Also, if I remembered the area to update, would it be possible to do a limited screen refresh for only a set of scan lines or a rectangle?

Regarding SWD: it works for uploading and debugging with some issues. It would have been great if NRST had been exposed as a pin header. I’m using an ST-LINK2 from an STM32 nucleo dev board, which also allows for adding that reset pin. I have had issues with the Arduino debugger not consistently being able to attach to the program at start. You may want to consider adding that for a subsequent revision.

I have added LVGL on top of the Adafruit GFX drawPixel() API. This works, but I’ll be looking to do some more efficient bulk memory copying.

Originally submitted via the contact form on soldered.com on 16 February 2026. Migrated to the forum for community visibility.

2

Soldered Support:

Theoretically it is possible to do a limited screen refresh, however with how the grayscale mode has to find the desired color by cleaning the screen, it would require a custom waveform which would need to be made and which would probably slow down the refresh rate of the display.

We will look into the possibility of exposing the nRST pin on future revisions, thank you for the feedback!