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Documentation/rtl8730e: document the general-purpose UART ports

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Add a Features bullet and a "uart" configuration section to the
RTL8730E EVB board page describing UART0-2 as /dev/ttyS1-3 at
115200 8N1, the serialrx / serialblaster loopback examples and the
runtime TERMIOS support, following the pke8721daf board format.

Signed-off-by: dechao_gong <dechao_gong@realsil.com.cn>
Assisted-by: Claude <noreply@anthropic.com>
This commit is contained in:
dechao_gong 2026-09-24 16:39:10 +08:00 • committed by Xiang Xiao
parent ec7ee53f6f
commit c2f19eef3d
1 changed files with 23 additions and 0 deletions
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23
Documentation/platforms/arm/rtl8730e/boards/rtl8730e_evb/index.rst
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@ -35,6 +35,9 @@ Supported in this NuttX port:
by the NuttX SMP scheduler
* GPIO pins exposed as ``/dev/gpioN`` character devices (input, output and
interrupt), driven through the SDK fwlib ROM layer
* General-purpose UARTs exposed as ``/dev/ttySN`` serial devices, driven
through the SDK fwlib ROM layer (the LOG-UART owns the console and
``/dev/ttyS0``)
* littlefs persistent storage mounted at ``/data`` (a dedicated SPI NOR flash
partition), backing the Wi-Fi key-value store
* Wi-Fi station and SoftAP through the ``wapi`` tool
@ -75,6 +78,26 @@ Pins are encoded with the ``AMEBA_PA()`` / ``AMEBA_PB()`` helpers from
``arch/arm/src/common/ameba/ameba_gpio.h`` (port A/B, pin 0-31), matching the
Ameba SDK ``PinName`` layout.
uart
----
Minimal NSH with the general-purpose UART driver and the ``serialrx`` /
``serialblaster`` examples enabled (no Wi-Fi). The LOG-UART owns the console
and ``/dev/ttyS0``, so the board registers UART0-2 from its table (see
``boards/arm/rtl8730e/rtl8730e_evb/src/rtl8730e_uart.c``) as ``/dev/ttyS1-3``
at 115200 8N1. Edit that table -- controller, TX/RX pads and baud -- to match a
board's wiring. The TX/RX pads use the same ``AMEBA_PA()`` / ``AMEBA_PB()``
encoding as the GPIO table; the driver muxes them to the UART function and
pulls RX high through the SDK ROM. Exercise a port with the examples (loop TX
back to RX, or wire it to a host serial adapter)::
nsh> serialblaster /dev/ttyS1 26 # stream a test pattern out /dev/ttyS1
nsh> serialrx /dev/ttyS1 26 # receive and dump bytes from /dev/ttyS1
The line format can be changed at runtime through ``tcsetattr()`` (the config
enables ``CONFIG_SERIAL_TERMIOS``). UART3 is reserved for Bluetooth and is not
exposed by the driver.
Wi-Fi
=====