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docs/esp32: Correct quickref for ESP32 hardware SPI with non-default IO.

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Nicko van Someren 2019-05-09 13:57:45 -06:00 zatwierdzone przez Damien George
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commit f812394c33
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docs/esp32/quickref.rst
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@ -128,6 +128,8 @@ with timer ID of -1::
The period is in milliseconds.
.. _Pins_and_GPIO:
Pins and GPIO
-------------
@ -274,8 +276,13 @@ class::
Hardware SPI bus
----------------
There are two hardware SPI channels that allow faster (up to 80Mhz)
transmission rates, but are only supported on a subset of pins.
There are two hardware SPI channels that allow faster transmission
rates (up to 80Mhz). These may be used on any IO pins that support the
required direction and are otherwise unused (see :ref:`Pins_and_GPIO`)
but if they are not configured to their default pins then they need to
pass through an extra layer of GPIO multiplexing, which can impact
their reliability at high speeds. Hardware SPI channels are limited
to 40MHz when used on pins other than the default ones listed below.
===== =========== ============
\ HSPI (id=1) VSPI (id=2)