Chapter 2. API Reference
Note: In order to use this feature you need OpenOCD version v0.10.0-esp32-20181105 or later.
3. You can use GDB to start and/or stop tracing automatically. To do this you need to prepare special gdbinit
file:
target remote :3333
mon reset halt
flushregs
tb heap_trace_start
commands
mon esp sysview start file:///tmp/heap.svdat
c
end
tb heap_trace_stop
commands
mon esp sysview stop
end
c
Using this file GDB will connect to the target, reset it, and start tracing when program hits breakpoint at
heap_trace_start(). Trace data will be saved to /tmp/heap_log.svdat. Tracing will be stopped when
program hits breakpoint at heap_trace_stop().
4. Run GDB using the following command xtensa-esp32s2-elf-gdb -x gdbinit </path/to/
program/elf>
5. Quit GDB when program stops at heap_trace_stop(). Trace data are saved in /tmp/heap.svdat
6. Run processing script $IDF_PATH/tools/esp_app_trace/sysviewtrace_proc.py -p -b
</path/to/program/elf> /tmp/heap_log.svdat
The output from the heap trace will look something like this:
Parse trace from '/tmp/heap.svdat'...
Stop parsing trace. (Timeout 0.000000 sec while reading 1 bytes!)
Process events from '['/tmp/heap.svdat']'...
[0.002244575] HEAP: Allocated 1 bytes @ 0x3ffaffd8 from task "alloc" on core 0 by:
/home/user/projects/esp/esp-idf/examples/system/sysview_tracing_heap_log/main/
,→sysview_heap_log.c:47
/home/user/projects/esp/esp-idf/components/freertos/port.c:355 (discriminator 1)
[0.002258425] HEAP: Allocated 2 bytes @ 0x3ffaffe0 from task "alloc" on core 0 by:
/home/user/projects/esp/esp-idf/examples/system/sysview_tracing_heap_log/main/
,→sysview_heap_log.c:48
/home/user/projects/esp/esp-idf/components/freertos/port.c:355 (discriminator 1)
[0.002563725] HEAP: Freed bytes @ 0x3ffaffe0 from task "free" on core 0 by:
/home/user/projects/esp/esp-idf/examples/system/sysview_tracing_heap_log/main/
,→sysview_heap_log.c:31 (discriminator 9)
/home/user/projects/esp/esp-idf/components/freertos/port.c:355 (discriminator 1)
[0.002782950] HEAP: Freed bytes @ 0x3ffb40b8 from task "main" on core 0 by:
/home/user/projects/esp/esp-idf/components/freertos/tasks.c:4590
/home/user/projects/esp/esp-idf/components/freertos/tasks.c:4590
[0.002798700] HEAP: Freed bytes @ 0x3ffb50bc from task "main" on core 0 by:
/home/user/projects/esp/esp-idf/components/freertos/tasks.c:4590
/home/user/projects/esp/esp-idf/components/freertos/tasks.c:4590
(continues on next page)
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