Partial Refresh method causes Full Refresh instead

[todd-herbert]

https://github.com/HelTecAutomation/e-ink/blob/5847ed8ff13e8ebe3dfd3ed6c68d10c5df1368d9/src/DEPG0290BxS75AFxX_BW.cpp#L223-L233

Tested on "2.9 Inch E-ink Display V2"

[todd-herbert]

Result of executing DEPG0290BxS75AFxX_BW.ino

HalLcd_Partial_Update.mp4

[todd-herbert]

Some modules labeled "Heltec 2.9 Inch E-ink Display" appear to ship with a red tab on the screen protector, and some ship with a blue tab. Closer inspection of the flex suggests that these supposedly identical boards have different, non-interchangable, panels. I will confirm later whether partial refresh is working correctly on panels shipped with the blue tabbed screen protectors.

[todd-herbert]

Further investigation has revealed:

• The display shown above with the red tab responds to the command set for DEPG0290BxSS75AFxX_BW, however "partial refresh" does not work correctly.
• The display with the red tab does not respond to the command set for DEPG0290BxS800FxX_BW
• The new display (with the blue tab) does not respond to either command set
• The new display (with the blue tab) appears to use a panel nearly identical to "GDEH029A1", and responds fully to other manufacturers' code (including partial refresh)

It seems the situation has only becoming more confusing. As I assume that the code for Partial Refresh must work correctly on at least one Heltec 2.9" BW display, am I correct in understanding that there are at least three different (non-interchangable) displays being sold by different vendors to be the same identical product?