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doc: Add STM32H745I-DISCO dual-core documentation

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Signed-off-by: Nonpawit Ekburanawat <nonpawit.ek@gmail.com>
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Nonpawit Ekburanawat 2024-09-03 19:21:51 +02:00 committed by Alan C. Assis
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Documentation/platforms/arm/stm32h7/boards/stm32h745i-disco/index.rst
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=================== ===================
ST STM32H745I-DISCO ST STM32H745I-DISCO
=================== ===================
Dual core support
-----------------
It is recommended to use CMake to build firmware consisting of multiple images.
The commands to build ``nsh_xxx`` configurations are as follows::
cmake -B build_cm7 -DBOARD_CONFIG=stm32h745i-disco:nsh_cm7 -GNinja
cmake -B build_cm4 -DBOARD_CONFIG=stm32h745i-disco:nsh_cm4 -GNinja
cmake --build build_cm7
cmake --build build_cm4
Serial console
--------------
The STM32H745I-DISCO board's ST-LINK interface is connected to USART3, which
is used as the serial console for the Cortex-M7 core by default. The
connections for USART3 are as follows:
================= ====
USART3 Signal Pin
================= ====
USART3_RX PB11
USART3_TX PB10
================= ====
When using the nsh_xxx configuration, UART7 is assigned to the Cortex-M4 core.
The UART7 connections can be accessed via the Arduino connector on the board:
================= =================
UART7 Signal Pin
================= =================
UART7_RX PA8 (Arduino D10)
UART7_TX PB4 (Arduino D5)
================= =================
This allows the Cortex-M4 core to utilize a separate serial interface, making
it possible to debug or interact with both cores simultaneously through
different UART interfaces.