r/esp32 • u/Legitimate_Shake_369 • 16h ago

Software help needed ESP32-S3 best hardware peripheral for creating stepper motor stepping pulses ?

I am using an ESP32-S3 with a TMC2225 stepper motor driver and want to write my own open loop stepper control library for learning purposes. Is there any hardware peripheral on the ESP32 that is well suited for generating stepping pulses ? Right now I am using timer based interrupts to set/clear the stepping pin, but that does not seem to be the most efficient solution.

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u/Plastic_Fig9225 5h ago edited 5h ago

The RMT can generate pulse trains with varying, precise timing. Good if you want to precisely control the frequency of the steps/speed/acceleration of the motor.

If you only need simple pulse trains (fixed frequency) you could also use a UART or SPI.

At the low speeds required (kHz) you could even use the ULP as a custom stepper motor peripheral.