Thanks for submitting this PR, @elvis-epx. I think this will be a really useful feature to have in MicroPython.

I've left some comments, mostly minor style and nitpicky things. The main high-level question I have is about the software filtering features.

The other thing that would be great to have here would a test, in tests/ports/esp32. It would be new as we also don't have a test for RMT TX ( 😢 ) but you could use the same loopback wiring pattern from tests/target_wiring/esp32.py to connect two GPIOs and then measure output from one via RMTRX. Would you be up for implementing something like this?

Sounds great, will take a while until I find time to write this test, but seems worthwhile.

Code size report:

Reference:  zephyr: Add support for RISC-V RV32IMC native code emitter. [9721955]
Comparison: esp32: Add RMT simple test. [merge of 2a4ec5c]
  mpy-cross:    +0 +0.000% 
   bare-arm:    +0 +0.000% 
minimal x86:    +0 +0.000% 
   unix x64:    +0 +0.000% standard
      stm32:    +0 +0.000% PYBV10
      esp32: +5932 +0.340% ESP32_GENERIC[incl +1440(data)]
     mimxrt:    +0 +0.000% TEENSY40
        rp2:    +0 +0.000% RPI_PICO_W
       samd:    +0 +0.000% ADAFRUIT_ITSYBITSY_M4_EXPRESS
  qemu rv32:    +0 +0.000% VIRT_RV32

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.42%. Comparing base (25b400f) to head (2a4ec5c).
⚠️ Report is 77 commits behind head on master.

@@            Coverage Diff             @@
##           master   #18454      +/-   ##
==========================================
+ Coverage   98.38%   98.42%   +0.04%     
==========================================
  Files         171      174       +3     
  Lines       22299    22333      +34     
==========================================
+ Hits        21938    21982      +44     
+ Misses        361      351      -10     

☔ View full report in Codecov by Sentry.
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Thanks for submitting this PR, @elvis-epx. I think this will be a really useful feature to have in MicroPython.
I've left some comments, mostly minor style and nitpicky things. The main high-level question I have is about the software filtering features.
The other thing that would be great to have here would a test, in tests/ports/esp32. It would be new as we also don't have a test for RMT TX ( 😢 ) but you could use the same loopback wiring pattern from tests/target_wiring/esp32.py to connect two GPIOs and then measure output from one via RMTRX. Would you be up for implementing something like this?

Sounds great, will take a while until I find time to write this test, but seems worthwhile.

@projectgus added a simple test, see if this is going the direction you want