ST B-U585I-IOT02A

This page discusses the port of NuttX to the STMicroelectronics B-U585I-IOT02A board. That board features the STM32U585AII6QU MCU with 2MiB of Flash and 768KiB of SRAM.

Status

2022-02-13: With TrustedFirmware-M from STM32CubeU5 and signing the Apache NuttX binary image to get a tfm_ns_init.bin, the board now boots and the basic NSH configuration works with Apache NuttX as the OS running in the non-secure world.

2022-04-03: The dependency on TrustedFirmware-M was dropped. I.e. the b-u585i-iot02a:nsh configuration now runs standalone.

Clock Source

Only the low speed external (LSE) 32.768kHz crystal (X2) is installed in default configurations.

FUNC

GPIO

OSC32_IN

PC14

OSC32_OUT

PC15

Arduino Connector

CN13 / SPI1 / D10 - D13

FUNC

GPIO

SPI1_NSS

PE12

SPI1_SCK

PE13

SPI1_MISO

PE14

SPI1_MOSI

PE15

Serial Consoles

Virtual COM Port on USART1

Default board is configured to use USART1 as console. USART1 is connected to the ST-LINKV3E Virtual COM port as well as made available on connector CN9.

Pins and Connectors:

FUNC

GPIO

Pin

NAME

TXD:

PA9

CN9 14

T.VCP_TX

RXD:

PA10

CN9 13

T.VCP_RX

Configurations

Information Common to All Configurations

Each configuration is maintained in a sub-directory and can be selected as follow:

tools/configure.sh b-u585i-iot02a:<subdir>

Before building, make sure the PATH environment variable includes the correct path to the directory than holds your toolchain binaries.

And then build NuttX by simply typing the following. At the conclusion of the make, the nuttx binary will reside in an ELF file called, simply, nuttx.:

make oldconfig
make

The <subdir> that is provided above as an argument to the tools/configure.sh must be is one of the following.

NOTES:

  1. These configurations use the mconf-based configuration tool. To change any of these configurations using that tool, you should:

    1. Build and install the kconfig-mconf tool. See nuttx/README.txt see additional README.txt files in the NuttX tools repository.

    2. Execute ‘make menuconfig’ in nuttx/ in order to start the reconfiguration process.

  2. Unless stated otherwise, all configurations generate console output on USART3, as described above under “Serial Console”. The elevant configuration settings are listed below:

    CONFIG_STM32L5_USART3=y
CONFIG_STM32L5_USART3_SERIALDRIVER=y
CONFIG_STM32L5_USART=y

CONFIG_USART3_SERIALDRIVER=y
CONFIG_USART3_SERIAL_CONSOLE=y

CONFIG_USART3_RXBUFSIZE=256
CONFIG_USART3_TXBUFSIZE=256
CONFIG_USART3_BAUD=115200
CONFIG_USART3_BITS=8
CONFIG_USART3_PARITY=0
CONFIG_USART3_2STOP=0

  3. All of these configurations are set up to build under Linux using the “GNU Tools for ARM Embedded Processors” that is maintained by ARM (unless stated otherwise in the description of the configuration).

    That toolchain selection can easily be reconfigured using ‘make menuconfig’. Here are the relevant current settings:

    Build Setup::

    CONFIG_HOST_LINUX=y : Linux environment

    System Type -> Toolchain::

    CONFIG_ARM_TOOLCHAIN_GNU_EABI=y : GNU ARM EABI toolchain

Configuration sub-directories

nsh:

Configures the NuttShell (nsh) located at examples/nsh. This configuration is focused on low level, command-line driver testing.