Help understanding crash reports....

[revolt_randy]

Hi all!

I'm looking for help in understanding this crash report I am getting:

Code: Select all

Guru Meditation Error: Core  0 panic'ed (LoadProhibited). Exception was unhandled.
Core 0 register dump:
PC      : 0x40092577  PS      : 0x00060633  A0      : 0x80092b75  A1      : 0x3ffe0dd0  
A2      : 0x3ffc6cb8  A3      : 0x0000005c  A4      : 0x3ffdeb04  A5      : 0x00000001  
A6      : 0x00060020  A7      : 0x00000000  A8      : 0x00000001  A9      : 0xef7bef7b  
A10     : 0x3ffdf7a0  A11     : 0x00000000  A12     : 0x3ffdf7a4  A13     : 0x3ffdea98  
A14     : 0x000009b0  A15     : 0x00000000  SAR     : 0x00000003  EXCCAUSE: 0x0000001c  
EXCVADDR: 0xef7bef7b  LBEG    : 0x400012c5  LEND    : 0x400012d5  LCOUNT  : 0xfffffffc  

Backtrace: 0x40092577:0x3ffe0dd0 0x40092b72:0x3ffe0df0 0x40084b24:0x3ffe0e10 0x40084b59:0x3ffe0e30 0x400866d5:0x3ffe0e50 0x4000beaf:0x3ffe0e70 0x4008eede:0x3ffe0e90 0x4008f124:0x3ffe0eb0 0x400867a8:0x3ffe0ed0 0x400867d8:0x3ffe0ef0 0x40086929:0x3ffe0f20 0x400f2777:0x3ffe0f40 0x400ed125:0x3ffe1200 0x400ea850:0x3ffe1250 0x400906b5:0x3ffe1280 0x4008f589:0x3ffe12b0 0x400db00d:0x3ffe12d0 0x400d9e39:0x3ffe12f0 0x4017bfa6:0x3ffe1310 0x400d42a2:0x3ffe1330 0x400d4355:0x3ffe1350 0x400d4963:0x3ffe1370 0x400d49fd:0x3ffe1390 0x400d3c11:0x3ffe13c0 0x4008f69d:0x3ffe13e0

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

I get this message when my code calls a function from the TFT_eSPI Library - https://github.com/Bodmer/TFT_eSPI. The function I'm calling copies the data of the display into a buffer. The code that causes the error msg is running on core1, so why is core0 involved?

Here's what I am using: ESP32 WROOM and 2.8in spi LCD display. I wrote a class to handle displaying a popup window on the LCD. When the class is used to draw a popup window, it copies the current display data to a buffer. When the popup window closes, the display data stored in the buffer is copied back to the LCD. The code I wrote to do this works fine, as stand alone code. The problem happens when the code was moved to a more complex project.

I am running on core0 code that handles a 3G cell connection via an adafruit 3G module (a simCom5320A module) and I have experienced problems coding for both cores before. But this one has me a bit baffled...

Can someone point me in the direction I need to be looking at?? Should I be looking at FreeRTOS??

Thanks for any help,
Randy

[ESP_Sprite]

Hard to say, might be something like memory corruption done by either core tripping up something on core 0. Try decoding the backtrace, perhaps that can give you more info.

[revolt_randy]

Thanks ESP_Sprite!

The EspExceptionDecoder tells me that after copying screen data to the buffer, on core1, the very next call to a library function on core0 is what causes the crash. I did read up on this: https://docs.espressif.com/projects/esp ... prohibited as that is the error I am having.

If this is a memory error, how do I track one of those down on an ESP32? Got any links to point me in the right direction?

Thanks for any help,
Randy

[ESP_Sprite]

Not sure how you would do that specifically on Arduino... however, for ESP-IDF, we have a page that describes some techniques, perhaps you can apply some to your Arduino project as well.

[revolt_randy]

Thanks again for giving me direction.

For now, I have just coded around this problem. I have a generic FT2232HL Board on order to use as a debugger and I'm ditching the arduino IDE.

Any recommendations on an IDE that supports debugging?

Thanks,
Randy