Board

Waveshare ESP32-S3 Matrix

Device Description

The Waveshare ESP32-S3 Matrix has 64 WS2812B LEDs built-in, driven by GPIO 14.

Hardware Configuration

GPIO 14 drives the WS2812B LEDs

Version

v3.2.0

IDE Name

Arduino IDE

Operating System

macOS 15.4

Flash frequency

80MHz

PSRAM enabled

no

Upload speed

460800

Description

After upgrading to arduino=esp32 v3.2.0, when using the Adafruit Neopixel library's simple example sketch to drive WS2812B LEDs, I get this error message and the ESP32-S3 halts:

E (4740) rmt: rmt_new_tx_channel(269): not able to power down in light sleep

If I set USB CDC On Boot: Disabled in the Arduino IDE tools menu, then the problem goes away.

Sketch

#include <Adafruit_NeoPixel.h>

#define PIN       14
#define NUMPIXELS 64

Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_RGB + NEO_KHZ800);

#define DELAYVAL 20

void setup() {
  Serial.begin(115200);

  pixels.begin();
}

void loop() {
  pixels.clear();

  for(int i=0; i<NUMPIXELS; i++) {
    pixels.setPixelColor(i, pixels.Color(0, 8, 0));  // green
    pixels.show();
    delay(DELAYVAL);
  }
}

Debug Message

Turning on verbose logging shows this:

[  4871][V][esp32-hal-rmt.c:454] rmtInit(): GPIO 14 - TX MODE - MemSize[48] - Freq=10000000Hz
 [  4871][V][esp32-hal-periman.c:235] perimanSetBusDeinit(): Deinit function for type RMT_TX (10) successfully set to 0x42003d2c
[  4879][V][esp32-hal-periman.c:235] perimanSetBusDeinit(): Deinit function for type RMT_RX (11) successfully set to 0x42003d2c
[  4890][V][esp32-hal-periman.c:160] perimanSetPinBus(): Pin 14 successfully set to type INIT (0) with bus 0x0
E (4740) rmt: rmt_new_tx_channel(269): not able to power down in light sleep
[  4907][E][esp32-hal-rmt.c:548] rmtInit(): GPIO 14 - RMT TX Initialization error.
[  4914][V][esp32-hal-rmt.c:142] _rmtDetachBus(): Detaching RMT GPIO Bus
[  4921][E][esp.c:81] espShow(): Failed to init RMT TX mode on pin 14

Other Steps to Reproduce

ESP-IDF v5.4.1 introduced a new rmt_tx_channel_config_t::allow_pd parameter which seems to be related to this error, since the "not able to power down in light sleep" message is mentioned in the v5.4.1 RMT API documentation here:
https://docs.espressif.com/projects/esp-idf/en/v5.4.1/esp32s3/api-reference/peripherals/rmt.html

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.