doc: Add environemt variable overriding to get started

This comit adds details about the overriding of environment variables such as
ESPPORT and ESPBAUD to the get started guide.
This commit is contained in:
Darian Leung 2018-09-02 21:24:35 +08:00
parent a557e8cc14
commit d268677017

View File

@ -315,6 +315,33 @@ That's all what you need to get started with ESP32!
Now you are ready to try some other :idf:`examples`, or go right to developing your own applications.
Environment Variables
=====================
Some environment variables can be specified whilst calling ``make`` allowing users to **override arguments without needing to reconfigure them using** ``make menuconfig``.
+-----------------+--------------------------------------------------------------+
| Variables | Description & Usage |
+=================+==============================================================+
| ``ESPPORT`` | Overrides the serial port used in ``flash`` and ``monitor``. |
| | |
| | Examples: ``make flash ESPPORT=/dev/tty/USB0``, |
| | ``make monitor ESPPORT=COM1`` |
+-----------------+--------------------------------------------------------------+
| ``ESPBAUD`` | Overrides the serial baud rate when flashing the ESP32. |
| | |
| | Example: ``make flash ESPBAUD=9600`` |
+-----------------+--------------------------------------------------------------+
| ``MONITORBAUD`` | Overrides the serial baud rate used when monitoring. |
| | |
| | Example: ``make monitor MONITORBAUD=9600`` |
+-----------------+--------------------------------------------------------------+
.. note::
Users can export environment variables (e.g. ``export ESPPORT=/dev/tty/USB0``).
All subsequent calls of ``make`` within the same terminal session will use
the exported value given that the variable is not simultaneously overridden.
Updating ESP-IDF
================