Nucleo WB55RG

Overview

The Nucleo WB55RG board is a multi-protocol wireless and ultra-low-power device embedding a powerful and ultra-low-power radio compliant with the Bluetooth® Low Energy (BLE) SIG specification v5.0 and with IEEE 802.15.4-2011.

STM32 microcontroller in VFQFPN68 package
2.4 GHz RF transceiver supporting Bluetooth® specification v5.0 and IEEE 802.15.4-2011 PHY and MAC
Dedicated Arm® 32-bit Cortex® M0+ CPU for real-time Radio layer
Three user LEDs
Board connector: USB user with Micro-B
Two types of extension resources:
- Arduino Uno V3 connectivity
- ST morpho extension pin headers for full access to all STM32 I/Os
Integrated PCB antenna or footprint for SMA connector
On-board ST-LINK/V2-1 debugger/programmer with SWD connector
Flexible power-supply options: ST-LINK USB VBUS or external sources
On-board socket for CR2032 battery
On-board ST-LINK/V2-1 debugger/programmer with USB re- enumeration capability: mass storage, virtual COM port and debug port

More information about the board can be found at the Nucleo WB55RG website.

Hardware

STM32WB55RG is an ultra-low-power dual core Arm Cortex-M4 MCU 64 MHz,Cortex-M0 32MHz with 1 Mbyte of Flash memory, Bluetooth 5, 802.15.4, USB, LCD, AES-256 SoC and provides the following hardware capabilities:

Ultra-low-power with FlexPowerControl (down to 600 nA Standby mode with RTC and 32KB RAM)
Core: ARM® 32-bit Cortex®-M4 CPU with FPU, frequency up to 64 MHz
Radio:
- 2.4GHz
- RF transceiver supporting Bluetooth® 5 specification, IEEE 802.15.4-2011 PHY and MAC, supporting Thread and ZigBee|reg| 3.0
- RX Sensitivity: -96 dBm (Bluetooth|reg| Low Energy at 1 Mbps), -100 dBm (802.15.4)
- Programmable output power up to +6 dBm with 1 dB steps
- Integrated balun to reduce BOM
- Support for 2 Mbps
- Dedicated Arm|reg| 32-bit Cortex|reg| M0 + CPU for real-time Radio layer
- Accurate RSSI to enable power control
- Suitable for systems requiring compliance with radio frequency regulations ETSI EN 300 328, EN 300 440, FCC CFR47 Part 15 and ARIB STD-T66
- Support for external PA
Clock Sources:
- 32 MHz crystal oscillator with integrated trimming capacitors (Radio and CPU clock)
- 32 kHz crystal oscillator for RTC (LSE)
- 2x Internal low-power 32 kHz RC (±5% and ±500ppm)
- Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25 % accuracy)
- 2 PLLs for system clock, USB, SAI and ADC
RTC with HW calendar, alarms and calibration
LCD 8 x 40 or 4 x 44 with step-up converter
Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors
16x timers:
- 2x 16-bit advanced motor-control
- 2x 32-bit and 5x 16-bit general purpose
- 2x 16-bit basic
- 2x low-power 16-bit timers (available in Stop mode)
- 2x watchdogs
- SysTick timer
Up to 114 fast I/Os, most 5 V-tolerant, up to 14 I/Os with independent supply down to 1.08 V
Memories
- Up to 1 MB Flash, 2 banks read-while-write, proprietary code readout protection
- Up to 320 KB of SRAM including 64 KB with hardware parity check
- External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories
- Quad SPI memory interface
4x digital filters for sigma delta modulator
Rich analog peripherals (down to 1.62 V)
- 12-bit ADC 4.26Msps, up to 16-bit with hardware oversampling, 200 uA/Msps
- 2x ultra-low-power comparator
- Accurate 2.5 V or 2.048 V reference voltage buffered output
System peripherals
- Inter processor communication controller (IPCC) for communication with Bluetooth|reg| Low Energy and 802.15.4
- HW semaphores for resources sharing between CPUs
- 2x DMA controllers (7x channels each) supporting ADC, SPI, I2C, USART, QSPI, SAI, AES, Timers
- 1x USART (ISO 7816, IrDA, SPI Master, Modbus and Smartcard mode)
- 1x LPUART (low power)
- 2x SPI 32 Mbit/s
- 2x I2C (SMBus/PMBus)
- 1x SAI (dual channel high quality audio)
- 1x USB 2.0 FS device, crystal-less, BCD and LPM
- Touch sensing controller, up to 18 sensors
- LCD 8x40 with step-up converter
- 1x 16-bit, four channels advanced timer
- 2x 16-bits, two channels timer
- 1x 32-bits, four channels timer
- 2x 16-bits ultra-low-power timer
- 1x independent Systick
- 1x independent watchdog
- 1x window watchdog
Security and ID

3x hardware encryption AES maximum 256-bit for the application, the Bluetooth|reg| Low Energy and IEEE802.15.4

Customer key storage / key manager services

HW public key authority (PKA)

Cryptographic algorithms: RSA, Diffie-Helman, ECC over GF(p)

True random number generator (RNG)

Sector protection against R/W operation (PCROP)

CRC calculation unit

96-bit unique ID

64-bit unique ID. Possibility to derive 802.15.5 64-bit and Bluetooth|reg| Low Energy 48-bit EUI

Up to 72 fast I/Os, 70 of them 5 V-tolerant
Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™

More information about STM32WB55RG can be found here:

Supported Features

The nucleo_wb55rg board supports the hardware features listed below.

on-chip / on-board: Feature integrated in the SoC / present on the board.
2 / 2: Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo: Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

`nucleo_wb55rg/stm32wb55xx` target

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M4F CPU1	`arm,cortex-m4f`
ADC	on-chip	STM32 ADC1	`st,stm32-adc`
Bluetooth	on-chip	STM32WB Radio device1	`st,stm32wb-rf`
Clock control	on-chip	STM32WB Reset and Clock controller node1	`st,stm32wb-rcc`
	on-chip	Generic fixed-rate clock provider3 2	`fixed-clock`
	on-chip	STM32 MSI Clock1	`st,stm32-msi-clock`
	on-chip	STM32 LSE Clock1	`st,stm32-lse-clock`
	on-chip	STM32WB and STM32WL PLL node1	`st,stm32wb-pll-clock`
	on-chip	STM32 Clock multiplexer1	`st,stm32-clock-mux`
Counter	on-chip	STM32 counters3	`st,stm32-counter`
Cryptographic accelerator	on-chip	STM32 AES Accelerator1	`st,stm32-aes`
DMA	on-chip	STM32 DMA controller (V2)2	`st,stm32-dma-v2`
DMA	on-chip	STM32 DMAMUX controller1	`st,stm32-dmamux`
Flash controller	on-chip	STM32 Family flash controller1	`st,stm32-flash-controller`
GPIO & Headers	on-chip	STM32 GPIO Controller6	`st,stm32-gpio`
GPIO & Headers	on-board	GPIO pins exposed on Arduino Uno (R3) headers1	`arduino-header-r3`
I2C	on-chip	STM32 I2C V2 controller2	`st,stm32-i2c-v2`
Input	on-board	Group of GPIO-bound input keys1	`gpio-keys`
Interrupt controller	on-chip	ARMv7-M NVIC (Nested Vectored Interrupt Controller)1	`arm,v7m-nvic`
Interrupt controller	on-chip	STM32 External Interrupt Controller1	`st,stm32-exti`
LED	on-board	Group of GPIO-controlled LEDs1	`gpio-leds`
Memory controller	on-chip	STM32 Battery Backed RAM1	`st,stm32-bbram`
MTD	on-chip	STM32 flash memory1	`st,stm32-nv-flash`
MTD	on-board	Fixed partitions of a flash (or other non-volatile storage) memory1	`fixed-partitions`
PHY	on-chip	This binding is to be used by all the usb transceivers which are built-in with USB IP1	`usb-nop-xceiv`
Pin control	on-chip	STM32 Pin controller1	`st,stm32-pinctrl`
Power management	on-chip	STM32 power controller1	`st,stm32-pwr`
PWM	on-chip	STM32 PWM2 2	`st,stm32-pwm`
QSPI	on-chip	STM32 QSPI Controller1	`st,stm32-qspi`
Reset controller	on-chip	STM32 Reset and Clock Control (RCC) Controller1	`st,stm32-rcc-rctl`
RNG	on-chip	STM32 Random Number Generator1	`st,stm32-rng`
RTC	on-chip	STM32 RTC1	`st,stm32-rtc`
Sensors	on-chip	STM32 family TEMP node for production calibrated sensors with two calibration temperatures1	`st,stm32-temp-cal`
	on-chip	STM32 VREF+1	`st,stm32-vref`
	on-chip	STM32 VBAT1	`st,stm32-vbat`
Serial controller	on-chip	STM32 USART1	`st,stm32-usart`
Serial controller	on-chip	STM32 LPUART1	`st,stm32-lpuart`
SMbus	on-chip	STM32 SMBus controller2	`st,stm32-smbus`
SPI	on-chip	STM32 SPI controller with embedded Rx and Tx FIFOs1 1	`st,stm32-spi-fifo`
SRAM	on-chip	Generic on-chip SRAM description1	`mmio-sram`
Timer	on-chip	ARMv7-M System Tick1	`arm,armv7m-systick`
	on-chip	STM32 timers2 2	`st,stm32-timers`
	on-chip	STM32 low-power timer (LPTIM)1	`st,stm32-lptim`
USB	on-chip	STM32 USB controller1	`st,stm32-usb`
Watchdog	on-chip	STM32 system window watchdog1	`st,stm32-window-watchdog`
Watchdog	on-chip	STM32 watchdog1	`st,stm32-watchdog`

Bluetooth and compatibility with STM32WB Copro Wireless Binaries

To operate bluetooth on Nucleo WB55RG, Cortex-M0 core should be flashed with a valid STM32WB Coprocessor binaries (either ‘Full stack’ or ‘HCI Layer’). These binaries are delivered in STM32WB Cube packages, under Projects/STM32WB_Copro_Wireless_Binaries/STM32WB5x/

For compatibility information with the various versions of these binaries, please check hal_stm32:lib/stm32wb/README.rst.

Note that since STM32WB Cube package V1.13.2, “full stack” binaries are not compatible anymore for a use in Zephyr and only “HCI Only” versions should be used on the M0 side.

Connections and IOs

Nucleo WB55RG Board has 6 GPIO controllers. These controllers are responsible for pin muxing, input/output, pull-up, etc.

Default Zephyr Peripheral Mapping:

UART_1 TX/RX : PB7/PB6
LPUART_1 TX/RX : PA3/PA2 (arduino_serial)
I2C_1_SCL : PB8
I2C_1_SDA : PB9
I2C_3_SCL : PC0
I2C_3_SDA : PC1
USER_PB : PC4
USER_PB1 : PD0
USER_PB2 : PD1
LD1 : PB5
LD2 : PB0
LD3 : PB1
SPI_1_NSS : PA4 (arduino_spi)
SPI_1_SCK : PA5 (arduino_spi)
SPI_1_MISO : PA6 (arduino_spi)
SPI_1_MOSI : PA7 (arduino_spi)
PWM_2 CH 1 : PA0
ADC_1_CH3 : PC2

System Clock

Nucleo WB55RG System Clock could be driven by internal or external oscillator, as well as main PLL clock. By default System clock is driven by HSE clock at 32MHz.

Serial Port

Nucleo WB55RG board has 2 (LP)U(S)ARTs. The Zephyr console output is assigned to USART1. Default settings are 115200 8N1.

Programming and Debugging

Nucleo WB55RG board includes an ST-LINK/V2-1 embedded debug tool interface.

Applications for the nucleo_wb55rg board configuration can be built the usual way (see Building an Application).

Flashing

The board is configured to be flashed using west STM32CubeProgrammer runner, so its installation is required.

Alternatively, OpenOCD or pyOCD can also be used to flash the board using the --runner (or -r) option:

$ west flash --runner openocd
$ west flash --runner pyocd

If you prefer, you can use pyOCD, but it requires to enable “pack” support with the following pyOCD command:

$ pyocd pack --update
$ pyocd pack --install stm32wb55rg

Flashing an application to Nucleo WB55RG

Connect the Nucleo WB55RG to your host computer using the USB port. Then build and flash an application. Here is an example for the Hello World application.

Run a serial host program to connect with your Nucleo board:

$ minicom -D /dev/ttyUSB0

Then build and flash the application.

# From the root of the zephyr repository
west build -b nucleo_wb55rg samples/hello_world
west flash

You should see the following message on the console:

Hello World! arm

Debugging

You can debug an application in the usual way. Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b nucleo_wb55rg samples/basic/blinky
west debug