Hibernation mode while updating eink display

[hertugen]

I have a little ESP32-circuit, that updates an eink display (Waveshare with integrated controllerboard), once and a while.

Code: Select all

display.init();
  display.setTextColor(GxEPD_BLACK);
  display.setRotation(0);
  //display.setFullWindow();
  display.firstPage();
  do
  {
  	// Set the individual pixels to a color (7 in total)
  }
  } while (display.nextPage());
  // Now we put the ESP into hibernation mode
 

It works as intended, but the thing is that the circuit is battery-operated and since the 7-color display can take quite some time to update, my question is: Is it possible to send image data to the eink display and then put the ESP into hibernation mode while the display finishes updating?

[lbernstone]

This ultimately is going to depend on the display controller, but it certainly won't work with a paged buffer like that. Use a full framebuffer, compose the whole image, and pass it to the display. The power domain for the display can't be under the control of the esp, since that will be going to sleep. If you can get it all lined up so the display is not dependent on the mcu being active, then it should work.