CircuitPython version

Adafruit CircuitPython 9.1.0-beta.1-18-g781c577745-dirty on 2024-05-10; M5Stack AtomS3 with ESP32S3

Code/REPL

import board
import pulseio
import adafruit_irremote

pulsein = pulseio.PulseIn(board.D1, maxlen=1020, idle_state=True)
decoder = adafruit_irremote.GenericDecode()

while True:
    pulses = decoder.read_pulses(pulsein,max_pulse=91000)
    print(len(pulses))

Behavior

prints "128"

Description

It is possible that this is an intended specification, but I am reporting it.

I have a HITACHI air conditioner remote control data (848+6 data length) being read by pulseio.pulseIn. Regardless of the maxlen I gave it, it only read a maximum of 128 data.

I looked into the cause and found the following code in ports/espressif/common-hal/pulseio/PulseIn.c#103 .

self->raw_symbols_size = MIN(64, maxlen / 2 + 1) * sizeof(rmt_symbol_word_t);

When I delete the MIN(64, x) calculation as follows, the behavior differed depending on the CPU.
The ESP32S3(M5 AtomS3) and ESP32C6(M5 NanoC6) received all 854 data as desired, but the ESP32-PICO(M5 Matrix) still had 128 data. This seems to reproduce #7352.

self->raw_symbols_size = (maxlen / 2 + 1) * sizeof(rmt_symbol_word_t);

Is MIN(64, x) required by some constraint? If almost esp32 chips can receive more data, I would like to receive it.

Additional information

No response