ST STM32H745I-DISCO

Dual core support

It is recommended to use CMake to build firmware consisting of multiple images.

Dual instances

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

Dual core RPTun

The commands to build nsh_xxx_rptun configurations are as follows:

cmake -B build_cm7_rptun -DBOARD_CONFIG=stm32h745i-disco:nsh_cm7_rptun -GNinja
cmake -B build_cm4_rptun -DBOARD_CONFIG=stm32h745i-disco:nsh_cm4_rptun -GNinja

cmake --build build_cm7_rptun
cmake --build build_cm4_rptun

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.

RPTun

When using the nsh_xxx_rptun configuration, users can connect to the CM4 core from the CM7 core by using the cu command:

nsh-cm7> cu -l /dev/ttyproxy
NuttShell (NSH) NuttX-10.4.0
nsh-cm4>