Users Manual

8. IDF Monitor

To check if "hello_world" is indeed running, type idf.py󰲧-p󰲧PORT monitor (Do not forget to

replace PORT with your serial port name).

This command launches the monitor application:

$󰲧idf.py󰲧-p󰲧/dev/ttyUSB0󰲧monitor

Running󰲧idf_monitor󰲧in󰲧directory󰲧[...]/esp/hello_world/build

Executing󰲧"python󰲧[...]/esp-idf/tools/idf_monitor.py󰲧-b󰲧115200󰲧[...]/esp/hello_world/build/

hello-world.elf"...

---󰲧idf_monitor󰲧on󰲧/dev/ttyUSB0󰲧115200󰲧---

---󰲧Quit:󰲧Ctrl+]󰲧|󰲧Menu:󰲧Ctrl+T󰲧|󰲧Help:󰲧Ctrl+T󰲧followed󰲧by󰲧Ctrl+H󰲧---

ets󰲧Jun󰲧󰲧8󰲧2016󰲧00:22:57

rst:0x1󰲧(POWERON_RESET),boot:0x13󰲧(SPI_FAST_FLASH_BOOT)

ets󰲧Jun󰲧󰲧8󰲧2016󰲧00:22:57

...

After startup and diagnostic logs scroll up, you should see "Hello world!" printed out by the

application.

...

Hello󰲧world!

Restarting󰲧in󰲧10󰲧seconds...

I󰲧(211)󰲧cpu_start:󰲧Starting󰲧scheduler󰲧on󰲧APP󰲧CPU.

Restarting󰲧in󰲧9󰲧seconds...

Restarting󰲧in󰲧8󰲧seconds...

Restarting󰲧in󰲧7󰲧seconds...

To exit IDF monitor use the shortcut Ctrl+].

If IDF monitor fails shortly after the upload, or, if instead of the messages above, you see

random garbage similar to what is given below, your board is likely using a 26MHz crystal.

Most development board designs use 40MHz, so ESP-IDF uses this frequency as a default

value.

Espressif Systems

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Sep. 2020