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Documentation/platforms/avr: added information about UART usage

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This patch adds instructions on how to enable UART on AVR DA/DB chips

Signed-off-by: Kerogit <kr.git@kerogit.eu>
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Kerogit 2025-05-11 22:39:36 +02:00 • committed by Xiang Xiao
parent 8126a8119f
commit 6f22e249a4
1 changed files with 19 additions and 0 deletions
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19
Documentation/platforms/avr/avrdx/index.rst
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@ -81,6 +81,25 @@ highest speed. With baud rate 57600, performance was dependent
on read/write buffer size. With buffer size of 8 there were still
some missed bytes.
To be able to use standard serial driver, it is needed to enable
the peripheral in MCU-specific configuration in
:menuselection:`System Type --> AVR DA/DB Peripheral Selections`
UART peripherals are enabled using
:menuselection:`Enable serial driver for USARTn` options. When enabled,
additional option :menuselection:`Activate USART0 alternative pinout`
is provided. See the chip datasheet for pinout information.
Other UART settings are then configured in driver configuration
:menuselection:`Device Drivers --> Serial Driver Support`
For every enabled peripheral, there is a corresponding
:menuselection:`USARTn Configuration` section. RTS/CTS and DMA support
must NOT be enabled here, neither of those is supported.
Each enabled peripheral is automatically registered as ``/dev/ttySn``
device file. File name corresponds to the peripheral related to it.
This for example means that ``USART1`` peripheral will always
be accessed through ``/dev/ttyS1`` regardless of what other ``USART``
peripherals are enabled (if any.)
Supported Boards
================