QUERY · ISSUE

RMT frequency other than 80 MHz?

openby 0wwafaopened 2025-01-15updated 2025-03-03

enhancementport-esp32

Description

In the documentation I read that the frequency for the RMT function is fixed at 80 Mhz.
Any chance you could add also the other frequencies available?

Code Size

The additional code size should be very tiny.

Implementation

I hope the MicroPython maintainers or community will implement this feature

Code of Conduct

Yes, I agree

CANDIDATE · PULL REQUEST

extend carrier frequency into RMT class

closedby JonRob812opened 2020-06-07updated 2020-06-08

The esp32 has hardware for the carrier freq. This allows micropython to use it! envoke with
r = esp32.RMT(0, pin=Pin(2), clock_div=80, carrier_en=True, carrier_duty_percent=50, carrier_freq_hz=38000)

these three keyword args added carrier_en=True, carrier_duty_percent=50, carrier_freq_hz=38000

Assessment

S Sonnet · medium

Both items touch ESP32 RMT frequency configuration, but they address different hardware features. The query asks about changing the base RMT clock source/frequency (fixed at 80 MHz APB), which controls timing resolution of RMT pulses. PR #6118 adds carrier frequency support — a separate hardware feature that superimposes a modulation carrier (e.g. 38 kHz for IR) on top of the RMT output. The PR does not change or expose the base clock source selection. They share the same component and conceptual space but the PR leaves the query's specific request unresolved.

Suggested action

Leave issue #16588 open. Link PR #6118 as context — it shows prior RMT extension work and may inform a follow-up implementation, but it does not implement the requested base clock frequency configurability.