GxEPD2 using the writeImage method with ACe screen

Using Arduino Displays
1

I'm currently working with the Waveshare 5.65" 7-color screen (GxEPD2_565c) - and I'm attempting to write a bitmap to it row-by-row using the writeImage method from GxEPD2. However, the screen will always remain blank. I have verified that the screen and setup do work with other methods by using other examples from the GxEPD2 repo.
I've also verified the code with a BW screen and writeImage works fine on that.

I wondered if there is a known limitation with updating this kind of screen this way?

2

Yes, there is. The controller of this display doesn't support partial window addressing.
Paged drawing with buffered drawing needs to use a special handling to use this screen.
The driver class has a method

    void setPaged(); // for GxEPD2_154c and GxEPD2_565c paged workaround

for this, and code for use e.g. in writeImage().

I suggest you use buffered drawing with this display for examples like GxEPD2_WiFi_Example.ino

Jean-Marc

3

I see now. I got it working with the buffered drawing example. Thanks for your help.

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