Firmware built with ESP-IDF Framework

1. How to compile it and upload in your board

Clone this repository:

Make sure to connect the epaper following the instructions provided in the ESP32 Schematics. There are 2 sections that need to be configured using: menuconfig

Display configuration

CALE configuration

Make sure to copy the full image URL from Screen configuration and also the Bearer token if your Screen is not public.

That should be the full configuration. To resume: set-target esp32  (esp32s2 is also supported) menuconfig flash monitor
If everything goes correctly then your display should download CALE dynamically generated bitmap and render it on the display. Because this version uses our own CalEPD component and it's optimized as much as we could it should run faster than Arduino-esp32. Some statistics in milliseconds for a 7.5 inches 800*480 display downloading a 48 Kb 1 bit depth BMP:
730 download of the image
256 _wakeUp settings+send Buffer
2004 update
2992 total time in millis

2. Selecting the right driver for your display

Please check Cale-idf Wiki section to see the supported epapers. We are planning to support only 400*300 and bigger einks (Although some T5's 2.13 & 2.7 inches are supported)

3. Known limitations

  1. No bluetooth support, configuration must be defined before compilation like described in Section 1
  2. Supports only uncompressed BMP formats, bit depth 1,4 or 8 (Not planning to add >8 bit depth support)
  3. It needs more testing and probably more optimizations

Font rendering demo: