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