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Guru Meditation Error: Core 0 panic'ed (IllegalInstruction) - ESP32-WROVER-KIT, SimpleWiFiServer

Posted: Fri Jun 22, 2018 10:45 am
by volatile
The problem is similar to other threads like viewtopic.php?f=19&t=5004
Arduino 1.8.5, esp-wrover-kit
The board is supplied from a beefy programmable power supply (set to 5.25V, capable of 5A) through the external power jack, using thick <20" short cables.
I flashed the Arduino example "SimpleWiFiServer", with my WiFi credentials and using GPIO2 (green part of the RGB LED) instead of GPIO5.
Everything "works" as expected, however after reloading the webpage a few times or sometimes even just waiting for a few minutes causes the ESP32 to reset with the infamous Guru error:

Code: Select all

Guru Meditation Error: Core  0 panic'ed (IllegalInstruction)
. Exception was unhandled.
Core 0 register dump:
PC      : 0x4011cfa8  PS      : 0x00060630  A0      : 0x80118ccb  A1      : 0x3ffd4920  
A2      : 0x3ffc6164  A3      : 0x3ffc8958  A4      : 0x00000000  A5      : 0x00000000  
A6      : 0x3ffd97f4  A7      : 0x00000000  A8      : 0x801187b9  A9      : 0x3ffd9830  
A10     : 0x3ffd9830  A11     : 0x00000000  A12     : 0x00000005  A13     : 0x1e000107  
A14     : 0x00000020  A15     : 0x00000001  SAR     : 0x00000020  EXCCAUSE: 0x00000000  
EXCVADDR: 0x00000000  LBEG    : 0x4000c2e0  LEND    : 0x4000c2f6  LCOUNT  : 0xffffffff  

Backtrace: 0x4011cfa8:0x3ffd4920 0x40118cc8:0x3ffd4960 0x40118fe1:0x3ffd4990 0x40087dd6:0x3ffd49c0

What's happening here?

I have to admit that I'm loosing a little faith into the ESP32. When even an official dev board, "optimal" power supply and a minimal (Arduino supplied) program crashes regurlarly......

Re: Guru Meditation Error: Core 0 panic'ed (IllegalInstruction) - ESP32-WROVER-KIT, SimpleWiFiServer

Posted: Wed Jun 27, 2018 5:35 pm
by copercini
Is your flash frequency at 80 or 40Mhz?