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docs/esp32: Update UART quickref on input-only pins.

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Signed-off-by: Tomasz 'CeDeROM' CEDRO <tomek@cedro.info>
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Tomasz 'CeDeROM' CEDRO 2022-08-18 05:20:02 +02:00 committed by Damien George
parent 6b16ce8d38
commit 769262ef03
1 changed files with 4 additions and 3 deletions
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docs/esp32/quickref.rst
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@ -216,9 +216,10 @@ They each have default GPIO assigned to them, however depending on your
ESP32 variant and board, these pins may conflict with embedded flash,
onboard PSRAM or peripherals.
Any GPIO can be used for hardware UARTs using the GPIO matrix, so to avoid
conflicts simply provide ``tx`` and ``rx`` pins when constructing. The default
pins listed below.
Any GPIO can be used for hardware UARTs using the GPIO matrix, except for
input-only pins 34-39 that can be used as ``rx``. To avoid conflicts simply
provide ``tx`` and ``rx`` pins when constructing. The default pins listed
below.
===== ===== ===== =====
\ UART0 UART1 UART2