- Add
#include <GDBStub.h>to the sketch - Upload the sketch
- Redirect serial port to TCP port:
tcp_serial_redirect.py -p /dev/tty.SLAB_USBtoUART -b 115200 --spy -P 9980 --rts=0 --dtr=0
Change port and baud rate as necessary. This command requires python and pyserial.
- Observe serial output:
nc localhost 9980
- Once crash happens, close nc and start gdb:
xtensa-lx106-elf-gdb /path/to/Sketch.cpp.elf -ex "target remote :9980"
Or, using the provided gdbcmds file:
xtensa-lx106-elf-gdb /path/to/Sketch.cpp.elf -x gdbcmds
- Use gdb to inspect program state at the point of an exception.
- To halt the target when software WDT fires, add
((int*)0) = 0;
at the top of __wrap_system_restart_local in core_esp8266_postmortem.c.
Espressif MIT License. See License file.