RMT standard example RMT_LED_Blink crashes

[fanfanlatulipe26]

Board

ESP32 Dev Kit v1

Device Description

nothing

Hardware Configuration

nothing
Using the builtin LED on pin 2

Version

v3.2.0

IDE Name

Arduino IDE 1.8.19

Operating System

Windows

Flash frequency

80Mhz

PSRAM enabled

no

Upload speed

921600

Description

In fact I use esp32 3.2.0 but with a patched file core/esp32/esp32-hal-rmt.c (PR #11203 )
The test craches after some blinks.

Sketch

The exact example provided with ESP32 Arduino distribution. Not  line changed.

Debug Message

ets Jun  8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0030,len:4888
load:0x40078000,len:16516
load:0x40080400,len:4
load:0x40080404,len:3476
entry 0x400805b4
[    17][D][esp32-hal-cpu.c:263] setCpuFrequencyMhz(): PLL: 480 / 2 = 240 Mhz, APB: 80000000 Hz
=========== Before Setup Start ===========
Chip Info:
------------------------------------------
  Model             : ESP32
  Package           : D0WD-Q6
  Revision          : 1.00
  Cores             : 2
  CPU Frequency     : 240 MHz
  XTAL Frequency    : 40 MHz
  Features Bitfield : 0x00000032
  Embedded Flash    : No
  Embedded PSRAM    : No
  2.4GHz WiFi       : Yes
  Classic BT        : Yes
  BT Low Energy     : Yes
  IEEE 802.15.4     : No
------------------------------------------
INTERNAL Memory Info:
------------------------------------------
  Total Size        :   374904 B ( 366.1 KB)
  Free Bytes        :   334240 B ( 326.4 KB)
  Allocated Bytes   :    33560 B (  32.8 KB)
  Minimum Free Bytes:   328456 B ( 320.8 KB)
  Largest Free Block:   110580 B ( 108.0 KB)
------------------------------------------
Flash Info:
------------------------------------------
  Chip Size         :  4194304 B (4 MB)
  Block Size        :    65536 B (  64.0 KB)
  Sector Size       :     4096 B (   4.0 KB)
  Page Size         :      256 B (   0.2 KB)
  Bus Speed         : 80 MHz
  Bus Mode          : QIO
------------------------------------------
Partitions Info:
------------------------------------------
                nvs : addr: 0x00009000, size:    20.0 KB, type: DATA, subtype: NVS
            otadata : addr: 0x0000E000, size:     8.0 KB, type: DATA, subtype: OTA
               app0 : addr: 0x00010000, size:  1280.0 KB, type:  APP, subtype: OTA_0
               app1 : addr: 0x00150000, size:  1280.0 KB, type:  APP, subtype: OTA_1
             spiffs : addr: 0x00290000, size:  1408.0 KB, type: DATA, subtype: SPIFFS
           coredump : addr: 0x003F0000, size:    64.0 KB, type: DATA, subtype: COREDUMP
------------------------------------------
Software Info:
------------------------------------------
  Compile Date/Time : Apr 23 2025 13:49:50
  Compile Host OS   : windows
  ESP-IDF Version   : v5.4.1-1-g2f7dcd862a-dirty
  Arduino Version   : 3.2.0
------------------------------------------
Board Info:
------------------------------------------
  Arduino Board     : ESP32_DEV
  Arduino Variant   : esp32
  Arduino FQBN      : esp32:esp32:esp32:JTAGAdapter=default,PSRAM=disabled,PartitionScheme=default,CPUFreq=240,FlashMode=qio,FlashFreq=80,FlashSize=4M,UploadSpeed=921600,LoopCore=1,EventsCore=1,DebugLevel=debug,EraseFlash=none,ZigbeeMode=default
============ Before Setup End ============
Starting Blink testing...
===> rmtInit OK! Tick = 2.5us - OK for testing

======================================
All set. Starting RMT testing Routine.
======================================

===> rmtWriteLooping() to Blink the LED.
Blinking at 1s on + 1s off :: 3 blinks
===> rmtWrite() (Blocking Mode) to Blink the LED.
Blinking at 500ms on + 500ms off :: 4 blinks
===> rmtWriteAsync() (Non-Blocking Mode) to Blink the LED.
Blinking at 250ms on + 250ms off :: 5 blinks
Blinking OFF for 1 seconds
End of Mixed Calls testing

===============================
Starting a Blinking sequence...
===============================

=========== After Setup Start ============
INTERNAL Memory Info:
------------------------------------------
  Total Size        :   374904 B ( 366.1 KB)
  Free Bytes        :   330144 B ( 322.4 KB)
  Allocated Bytes   :    37096 B (  36.2 KB)
  Minimum Free Bytes:   324360 B ( 316.8 KB)
  Largest Free Block:   110580 B ( 108.0 KB)
------------------------------------------
GPIO Info:
------------------------------------------
  GPIO : BUS_TYPE[bus/unit][chan]
  --------------------------------------  
     1 : UART_TX[0]
     2 : RMT_TX
     3 : UART_RX[0]
============ After Setup End =============
Using RMT Async Writing and its Completion to blink an LED.
Blinking at 1s on + 1s off :: 5 blinks
Blinking at 500ms on + 500ms off :: 5 blinks
Blinking at 250ms on + 250ms off :: 5 blinks
Blinking OFF for 1 seconds
Using RMT Writing loop to blink an LED.
Blinking at 1s on + 1s off :: 3 blinks
Blinking at 500ms on + 500ms off :: 5 blinks
Blinking at 250ms on + 250ms off :: 10 blinks
Blinking OFF for 2 seconds
Using RMT Writing and its Completion to blink an LED.
Blinking at 1s on + 1s off :: 2 blinks
Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.

Core  1 register dump:
PC      : 0x40084582  PS      : 0x00060f30  A0      : 0x80084640  A1      : 0x3ffb2100  
A2      : 0x3ffb8e9c  A3      : 0x3ffb8e9c  A4      : 0x61a861a8  A5      : 0x0000000f  
A6      : 0x3ffb92b8  A7      : 0x00000000  A8      : 0x00000010  A9      : 0x00000000  
A10     : 0x3ff5683c  A11     : 0x3ff56800  A12     : 0x00000000  A13     : 0x00000000  
A14     : 0x00000040  A15     : 0x3ffb9388  SAR     : 0x00000020  EXCCAUSE: 0x0000001c  
EXCVADDR: 0x00000018  LBEG    : 0x40086480  LEND    : 0x40086496  LCOUNT  : 0xffffffff  


Backtrace: 0x4008457f:0x3ffb2100 0x4008463d:0x3ffb2120 0x40084756:0x3ffb2150 0x400e0b79:0x3ffb2180 0x400d22a2:0x3ffb21d0 0x400d2332:0x3ffb2210 0x400d1b11:0x3ffb2230 0x400d1c59:0x3ffb2250 0x400d3290:0x3ffb2270 0x40089895:0x3ffb2290




ELF file SHA256: 9ac58ff70

Rebooting...
ets Jun  8 2016 00:22:57

Other Steps to Reproduce

Fail in the main loop.
It seems that each function allone is OK ( RMT_Write_Aync_Non_Blocking_Blink(); / RMT_Loop_Write_Blink(); /RMT_Single_Write_Blocking_Blink();)
But when executed one after each other in a row there is a crash.
Trace:

PC: 0x40084582
EXCVADDR: 0x00000018

Decoding stack results
0x4008457f: rmt_tx_mark_eof at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp_driver_rmt/src/rmt_tx.c line 636
0x4008463d: rmt_encode_check_result at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp_driver_rmt/src/rmt_tx.c line 674
0x40084756: rmt_tx_do_transaction at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp_driver_rmt/src/rmt_tx.c line 753
0x400e0b79: rmt_transmit at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp_driver_rmt/src/rmt_tx.c line 594
0x400d22a2: _rmtWrite at C:\Users\Francis\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.2.0\cores\esp32\esp32-hal-rmt.c line 347
0x400d2332: rmtWrite at C:\Users\Francis\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.2.0\cores\esp32\esp32-hal-rmt.c line 405
0x400d1b11: RMT_Single_Write_Blocking_Blink() at C:\Users\Francis\AppData\Local\Temp\arduino_modified_sketch_770913/RMT_LED_Blink.ino line 281
0x400d1c59: loop() at C:\Users\Francis\AppData\Local\Temp\arduino_modified_sketch_770913/RMT_LED_Blink.ino line 358
0x400d3290: loopTask(void*) at C:\Users\Francis\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.2.0\cores\esp32\main.cpp line 74
0x40089895: vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/FreeRTOS-Kernel/portable/xtensa/port.c line 139

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

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

[SuGlider]

@fanfanlatulipe26 - issue confirmed. Analysis in progress.

[SuGlider]

The issue was found. The problem was related to RMT Loop Mode when the sketch stops this infinite loop mode and tries to use a different mode. It only happens with the ESP32. The original example works correctly for other SoC because those support SOC_RMT_SUPPORT_TX_LOOP_AUTO_STOP, which is not supported by the ESP32.

The PR #11292 fixes the example to work as supposed using the ESP32.

Please try the new example version and let me know.

[fanfanlatulipe26]

Very fast fix ;-)
I made the test with the new example only on a ESP32. Perfect. No crash
(and also good timing )
Thanks