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dmesg documentation

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Ray Morris 2025-04-29 00:31:43 -05:00
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docs/development/serial_printf_debugging.md
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@ -4,7 +4,9 @@
INAV offers a function to use serial `printf` style debugging.
This provides a simple and intuitive debugging facility. This facility is only available after the serial sub-system has been initialised, which should be adequate for all but the most hard-core debugging requirements.
This provides a simple and intuitive debugging facility.
This facility is only available after the serial sub-system has been initialised, but logs generated prior to serial
initialization can be obtained via the `dmesg` functionality.
In order to use this feature, the source file must include `common/log.h`.
@ -137,3 +139,12 @@ The output will be formatted as follows:
For the Configurator, debug messages are shown in the developer console log.
Note: The numeric value in square brackets is the FC uptime in seconds.
To see printf-style log messages generated prior serial initialization, reserve about 2KB-4KB RAM to buffer the
log) by defining DMESG_SIZE:
#define DMESG_SIZE 2048
Then `make clean` and `make`.
Then in the CLI you can run `dmesg` to see the buffered log.
Note dmesg also requires that a serial port be defined for serial debugging.