This is a combined example code that does neopixel animations while listening for IR commands (given a capable enough chip) and while animating a neopixel matrix. It is written/tested on ESP8266 and ESP32. It should also work with minimal changes on teensy.

This is a fork of https://github.com/marcmerlin/FastLED-IR and adds FastLED-Neomatrix / SmartMatrix::GFX code:

It uses these libraries

• https://github.com/markszabo/IRremoteESP8266/ (ESP8266 only)
• https://github.com/z3t0/Arduino-IRremote (ESP32 and others)
• https://github.com/FastLED/FastLED
• https://github.com/marcmerlin/FastLED_NeoMatrix (NeoMatrix backend only)
• https://github.com/marcmerlin/SmartMatrix_GFX + https://github.com/pixelmatix/SmartMatrix/tree/teensylc (SmartMatrix backend only)
• https://github.com/adafruit/Adafruit-GFX-Library

https://www.youtube.com/watch?v=tU_wkrrv_4A

On NeoMatrix Backend (FastLED::NeoMatrix) 24x32:

On SmartMatrix backend (SmartMatrix::GFX), 64x96: