NeoPixel can crash system.

[Spaceballs3000]

Board

ESP32S3 Dev Module

Device Description

ESP32S3 Dev Module

Hardware Configuration

ESP32S3 Dev Module

Version

v3.0.1

IDE Name

Arduino IDE 2.3.2

Operating System

Windows 10

Flash frequency

80

PSRAM enabled

yes

Upload speed

921600

Description

System will crash if data is received on port 6656. If you comment out either the one in main or UDP callback function, it will work fine.

Sketch

#include "WiFi.h"
#include "AsyncUDP.h"

#define RGB_BRIGHTNESS 20 // Change white brightness (max 255)
#define RGB_BUILTIN 21

const char * ssid = "xxxx";
const char * password = "xxxx";

AsyncUDP udp_in;

void setup()
{      
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  WiFi.waitForConnectResult();
  udp_in.listenMulticast(IPAddress(239,1,2,3), 6656);      
  udp_in.onPacket([](AsyncUDPPacket packet) { udpRXCallBack(packet); });    
}

void loop()
{
  neopixelWrite(RGB_BUILTIN,0,0,0); // off
}

void udpRXCallBack(AsyncUDPPacket &packet) 
{
  neopixelWrite(RGB_BUILTIN,0,0,RGB_BRIGHTNESS); // Blue
}

Debug Message

ESP-ROM:esp32s3-20210327

assert failed: xEventGroupClearBits event_groups.c:495 (xEventGroup)


Backtrace: 0x40376f76:0x3fca5310 0x4037d42d:0x3fca5330 0x40383119:0x3fca5350 0x4037ff5e:0x3fca5480 0x420068c3:0x3fca54a0 0x4200697e:0x3fca54e0 0x42006796:0x3fca5500 0x42002e6a:0x3fca5590 0x42002e8e:0x3fca55b0 0x42005c0d:0x3fca5640 0x42005c62:0x3fca56e0

Other Steps to Reproduce

No response

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

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

[Me No Dev]

you should not just have neopixelWrite(RGB_BUILTIN,0,0,0); in the loop. There should be delay or this should be called just once

[Spaceballs3000]

you should not just have neopixelWrite(RGB_BUILTIN,0,0,0); in the loop. There should be delay or this should be called just once

I still hit crashes with an delay, i.e.

void loop()
{
  delay(1);
  neopixelWrite(RGB_BUILTIN,RGB_BRIGHTNESS,RGB_BRIGHTNESS,RGB_BRIGHTNESS); // White
}

void udpRXCallBack(AsyncUDPPacket &packet) 
{
  neopixelWrite(RGB_BUILTIN,0,0,RGB_BRIGHTNESS); // Blue
}

[Rodrigo Garcia]

Issue confirmed. It is a concurrency problem within neopixelWrite() and RMT.

[Rodrigo Garcia]

@Spaceballs3000 - The PR #9906 shall solve this issue. Please test it.

[Spaceballs3000]

@Spaceballs3000 - The PR #9906 shall solve this issue. Please test it.

Tested fix, I do not get the crashes anymore.
Thanks!