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add note about default SPI pin usage for stability/performance (#2921) 

The current SPI documentation doesn't mention that there is a difference in how ESPs work depending on which GPIOs are chosen for the SPI setup. While in theory all regular GPIOs can be used (and might work for a lot of people/setups), using the dedicated default SPI pins can be the missing puzzle piece for unstable ESP/device combinations

https://techoverflow.net/2021/07/26/what-is-the-spi-pinout-of-the-esp32-esp-wroom-32/

https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/
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BerlinJoker 2023-05-15 20:30:58 +02:00 committed by GitHub
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components/spi.rst
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@ -44,6 +44,8 @@ Configuration variables:
- **force_sw** (*Optional*, boolean): Whether software implementation should be used even if hardware one is available.
- **id** (*Optional*, :ref:`config-id`): Manually specify the ID for this SPI hub if you need multiple SPI hubs.
**Please note:** while both ESP8266 and ESP32 support the reassignment of the default SPI pins to other GPIO pins, using the dedicated SPI pins can improve performance and stability for certain ESP/device combinations.
See Also
--------