We featured [Fabrizio Di Vittorio]’s FabGL library for the ESP32 back in April of this year. This library allows VGA output using a simple resistor based DAC (3 resistors for 8 colors; 6 resi… ...

Also, looking at the ESP32’s SPI library, it seems they have implemented SPISettings. However, their SPI.beginTransaction() function doesn’t do any interrupt or mutex locking.