Description
Basic Infos
- This issue complies with the issue POLICY doc.
- I have read the documentation at readthedocs and the issue is not addressed there.
- I have tested that the issue is present in current master branch (aka latest git).
- I have searched the issue tracker for a similar issue.
- If there is a stack dump, I have decoded it.
- I have filled out all fields below.
Platform
- Hardware: ESP-12
- Core Version: 521ae60
- Development Env: Arduino IDE 1.8.19
- Operating System: Ubuntu
Settings in IDE
- Module: Adafruit Feather HUZZAH ESP8266
- Flash Mode: qio
- Flash Size: 4MB
- lwip Variant: v2 Higher Bandwidth
- Reset Method: nodemcu
- Flash Frequency: 40Mhz
- CPU Frequency: 80Mhz
- Upload Using: SERIAL
- Upload Speed: 460800
Problem Description
A blocking library function that uses delay(0) will fail with Software WDT Reset.
This last worked in Core version 3.1.0
Changes made in commit 39080e3 altered this behavior
MCVE Sketch
#include <Arduino.h>
// Last worked with Core v3.1.0
void setup() {
Serial.begin(115200);
delay(200);
}
void loop() {
Serial.printf("\r\n\r\ndelay(0) test - should never WDT reset\r\n");
while(true) {
delay(0);
}
}
Debug Messages
--------------- CUT HERE FOR EXCEPTION DECODER ---------------
Soft WDT reset
Exception (4):
epc1=0x40100249 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000
>>>stack>>>
ctx: cont
sp: 3ffffe20 end: 3fffffd0 offset: 0160
3fffff80: 00000000 3fffff60 3fffff90 3ffee5a8 <
3fffff90: 3fffdad0 00000000 00000000 40201f3c
3fffffa0: 3fffdad0 00000cc1 3ffee57c 40201069
3fffffb0: feefeffe 00000042 3ffee57c 4020199c
3fffffc0: feefeffe feefeffe 3fffdab0 40100c05
<<<stack<<<
--------------- CUT HERE FOR EXCEPTION DECODER ---------------
ets Jan 8 2013,rst cause:2, boot mode:(3,7)
Exception 4: Level1Interrupt: Level-1 interrupt as indicated by set level-1 bits in the INTERRUPT register
PC: 0x40100249: millis() at /home/mhightow/Arduino/hardware/esp8266com/esp8266/cores/esp8266/core_esp8266_wiring.cpp line 176
EXCVADDR: 0x00000000
Decoding stack results
0x40201f3c: __delay(unsigned long) at /home/mhightow/Arduino/hardware/esp8266com/esp8266/cores/esp8266/coredecls.h line 77
0x40201069: loop() at /home/mhightow/Arduino/Debug/DelayZero/DelayZero.ino line 11
0x4020199c: loop_wrapper() at /home/mhightow/Arduino/hardware/esp8266com/esp8266/cores/esp8266/core_esp8266_main.cpp line 258
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