A further step with the ESP32-2432S028R called CYD

My earlier experiments with the CYD were unsatisfactory in two respects.

• only 2 of the 3 SPI devices could be used simultaneously:
  • Display and Touchpad
  • Display and SD card
  • Touchpad and SD card
• The colors of a screenshot saved on the SD card had to be swapped afterwards with an image editing program, e.g. XnView.

Solving the Touchpad Problem

I was advised that a software SPI should be used for the touchpad and I found the touchpad library nitek/XPT2046_Bitbang_Slim by Claus Näveke. I extended this class so that it now also includes the events

• shortTouch
• longTouch
• swipes right, up, right, down
• and a loop() function which can be called in the main loop.

To react to events in the loop function, 6 callback functions can be installed:

• onShortTouch
• onLongTouch
• onSwipeRight
• onSwipeUp
• onSwipeLeft
• onSwipeDown

Caution: If you use this class, the touchpad section in the configuration file lgfx_ESP32_2432S028.h must be commented out.

Solving the color Problem

I was able to solve the color problem of saved screenshots by swapping the colors in the saveBMPtoSD function of the LovyanGFX example before saving them.