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ST 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 Zephyr nucleo_wb55rg board configuration supports the following hardware features:
Interface |
Controller |
Driver/Component |
|---|---|---|
NVIC |
on-chip |
nested vector interrupt controller |
UART |
on-chip |
serial port-polling; serial port-interrupt |
PINMUX |
on-chip |
pinmux |
GPIO |
on-chip |
gpio |
I2C |
on-chip |
i2c |
SPI |
on-chip |
spi |
PWM |
on-chip |
pwm |
ADC |
on-chip |
adc |
WATCHDOG |
on-chip |
independent watchdog |
RADIO |
on-chip |
Bluetooth Low Energy |
Other hardware features are not yet supported on this Zephyr port.
The default configuration can be found in the defconfig file:
boards/arm/nucleo_wb55rg/nucleo_wb55rg_defconfig
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 modules/hal/stm32/lib/stm32wb/hci/README in the hal_stm32 repo. 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
Applications for the nucleo_wb55rg board configuration can be built the
usual way (see Building an Application).
Flashing
Nucleo WB55RG board includes an ST-LINK/V2-1 embedded debug tool interface. This interface is supported by the openocd version included in the Zephyr SDK since v0.11.0.
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