================
ST Nucleo WB55RG
================

This page file discusses the port of NuttX to the STMicroelectronics
NUCLEO-WB55RG board.  That board features the multi-protocol wireless and
ultra-low-power STM32WB55RGV6 MCU with 1MiB of Flash and 256KiB of SRAM.
A dedicated M0+ coprocessor is responsible for performing the real-time
low layer operations via one of the available wireless stacks distributed
as binaries in STM32CubeWB package.

Status
======

April 2022: The nucleo-wb55rg board minimal setup compiles successfully.

June 2022: All STM32WB chip family is defined, many of peripherals are
supported - GPIO, EXTI, DMA, timers, flash, PWR, RTC, USART/LPUART, SPI,
IPCC. SRAM2 heap allocation works. Builtin apps work and ostest passed.

July 2022: Added BLE support with mailbox IPC driver.

LEDs
====

The board has 3 user leds::

    LED1 (Blue)      PB5
    LED2 (Green)     PB0
    LED3 (Red)       PB1

These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
defined.  In that case, the usage by the board port is defined in
include/board.h and src/stm32_autoleds.c.

Buttons
=======

The board has 3 user buttons::

    SW1     PC4 (needs SB47 close)
    SW2     PD0
    SW3     PD1

Serial Consoles
===============

The MCU's USART1 is connected to the on-board ST-LINK/V2-1 and exposed as
a Virtual COM Port over the same Micro-USB Type B connection used for
programming/debugging.

Configurations
==============

nsh:
----

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

ble:
----

Besides the NuttShell this configuration also enables BLE support.
It includes btsak application for testing BLE applications.

nimble:
-------

Besides the NuttShell it includes nimble example application which
uses NimBLE host stack.::

  nsh> ifup bnep0
  nsh> nimble