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Exception output over USB with ESP32 S3?
Posted: Mon Oct 17, 2022 8:14 pm
by aaronw
Related to my previous open question about the ee.vld.128.ip instruction failing
viewtopic.php?f=2&t=30121 instruction failing, how do I get the ESP32 S3 to dump out exception information over the USB interface? On the project I'm working on I would much prefer to not have to have a UART interface as well as USB due to size constraints. Is there a way to have exception information printed out the USB interface either instead of or along with the UART interface?
Re: Exception output over USB with ESP32 S3?
Posted: Mon Oct 17, 2022 9:26 pm
by ESP_igrr
The answer might depend on whether you are using IDF or Arduino.
In IDF, console output and panic handler messages are printed both to UART and USB_SERIAL_JTAG by default. You can change this in menuconfig if desired.
In Arduino the default Serial destination it is configured by one of the options in Tools menu.
Re: Exception output over USB with ESP32 S3?
Posted: Wed Oct 19, 2022 9:25 am
by aaronw
In my case, I am using the Arduino environment. There does not appear to be any setting that controls this there. I can see other print statements without any issues, only the exception information only appears to go to the UART interface.
Re: Exception output over USB with ESP32 S3?
Posted: Sun Dec 31, 2023 2:45 am
by nickolay
I was using an old version of ESP32 Arduino without realizing it. This manifested in missing backtrace info — Serial output and task watchdog messages displayed fine over USB-CDC.
Newer versions (esp32-arduino 2.0.7+ / esp-idf 4.4.4)
print to USB serial by default (assuming you see
any output at all). I tested with this sketch:
Code: Select all
void setup()
{
Serial.begin(115200);
Serial.println("Let's provoke the s/w wdt firing...");
sleep(5);
int *x = 0;
*x = 5;
Serial.println("This line will not ever print out");
}
void loop(){}
For the reference, the
panic handler code is
here, and esp32-arduino
wraps it, but doesn't override.
Code: Select all
Guru Meditation Error: Core 0 panic'ed (StoreProhibited). Exception was unhandled.
Core 0 register dump:
PC : 0x42002a73 PS : 0x00060830 A0 : 0x82003fa5 A1 : 0x3fcebd70
A2 : 0x00000000 A3 : 0x00000000 A4 : 0x00000000 A5 : 0x00000000
A6 : 0x3fcebf04 A7 : 0x80000001 A8 : 0x82002a70 A9 : 0x3fcebd50
A10 : 0x00000000 A11 : 0x00000004 A12 : 0x0007ffff A13 : 0x80000000
A14 : 0x02c93da0 A15 : 0x00ffffff SAR : 0x00000010 EXCCAUSE: 0x0000001d
EXCVADDR: 0x00000000 LBEG : 0x40056f5c LEND : 0x40056f72 LCOUNT : 0xffffffff