BL654 Sensor Board
Overview
The BL654 Sensor Board hardware provides support for the Ezurio BL654 module which is powered by a Nordic Semiconductor nRF52840 ARM Cortex-M4F CPU.
This sensor board has the following features:
ADC
CLOCK
FLASH
GPIO
I2C
MPU
NVIC
PWM
RADIO (Bluetooth Low Energy and 802.15.4)
RTC
Segger RTT (RTT Console)
SPI
UART
WDT
BL654 Sensor Board connected to USB-SWD Programmer (UART and SWD access)
More information about the BL654 module can be found on the BL654 website [2], more information about the USB-SWD Programmer can be found on the USB-SWD Programmer website [4].
Hardware
Supported Features
The bl654_sensor_board 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.
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M4F CPU1 |
|
ADC |
on-chip |
Nordic Semiconductor nRF family SAADC node1 |
|
ARM architecture |
on-chip |
Nordic UICR (User Information Configuration Registers)1 |
|
on-chip |
Nordic EGU (Event Generator Unit)6 |
||
on-chip |
Nordic nRF family ACL (Access Control List)1 |
||
on-chip |
Nordic nRF family MWU (Memory Watch Unit)1 |
||
Audio |
on-chip |
Nordic PDM (Pulse Density Modulation interface)1 |
|
Clock control |
on-chip |
Nordic nRF clock control node1 |
|
Comparator |
on-chip |
Nordic nRF COMP (analog COMParator)1 |
|
Counter |
on-chip |
Nordic nRF timer node5 |
|
Cryptographic accelerator |
on-chip |
Nordic ECB (AES electronic codebook mode encryption)1 |
|
on-chip |
Nordic nRF family CCM (AES CCM mode encryption)1 |
||
on-chip |
ARM TrustZone CryptoCell 3101 |
||
Debug |
on-chip |
ARMv7 instrumentation trace macrocell1 |
|
Flash controller |
on-chip |
Nordic NVMC (Non-Volatile Memory Controller)1 |
|
on-chip |
Properties defining the interface for the Nordic QSPI peripheral1 |
||
GPIO & Headers |
on-chip |
NRF5 GPIOTE1 |
|
on-chip |
NRF5 GPIO2 |
||
I2C |
on-chip |
Nordic nRF family TWI (TWI master)1 |
|
on-chip |
Nordic nRF family TWIM (TWI master with EasyDMA)1 |
||
I2S |
on-chip |
Nordic I2S (Inter-IC sound interface)1 |
|
IEEE 802.15.4 |
on-chip |
Nordic nRF IEEE 802.15.4 node1 |
|
Input |
on-board |
Group of GPIO-bound input keys1 |
|
Interrupt controller |
on-chip |
ARMv7-M NVIC (Nested Vectored Interrupt Controller)1 |
|
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
Miscellaneous |
on-chip |
Nordic FICR (Factory Information Configuration Registers)1 |
|
on-chip |
Nordic nRF family PPI (Programmable Peripheral Interconnect)1 |
||
MTD |
on-chip |
Flash node1 |
|
on-board |
Fixed partitions of a flash (or other non-volatile storage) memory1 |
||
Networking |
on-chip |
Nordic nRF family RADIO peripheral1 |
|
on-chip |
Nordic nRF family NFCT (Near Field Communication Tag)1 |
||
Pin control |
on-chip |
The nRF pin controller is a singleton node responsible for controlling pin function selection and pin properties1 |
|
Power management |
on-chip |
Nordic nRF power control node1 |
|
PWM |
on-chip |
||
on-chip |
nRFx S/W PWM1 |
||
Regulator |
on-chip |
Nordic nRF5X regulator (fixed stage of the core supply)1 |
|
on-chip |
Nordic nRF52X regulator (high voltage stage of the main supply)1 |
||
Retained memory |
on-chip |
Nordic GPREGRET (General Purpose Register Retention) device2 |
|
RNG |
on-chip |
Nordic nRF family RNG (Random Number Generator)1 |
|
RTC |
on-chip |
Nordic nRF RTC (Real-Time Counter)3 |
|
Sensors |
on-board |
BME280 integrated environmental sensor1 |
|
on-chip |
Nordic nRF family TEMP node1 |
||
on-chip |
Nordic nRF quadrature decoder (QDEC) node1 |
||
Serial controller |
on-chip |
Nordic nRF family UART1 |
|
on-chip |
Nordic nRF family UARTE (UART with EasyDMA)1 |
||
SPI |
on-chip |
Nordic nRF family SPIM (SPI master with EasyDMA)4 |
|
SRAM |
on-chip |
Generic on-chip SRAM1 |
|
Timer |
on-chip |
ARMv7-M System Tick1 |
|
USB |
on-chip |
Nordic nRF52 USB device controller1 |
|
Watchdog |
on-chip |
Nordic nRF family WDT (Watchdog Timer)1 |
Connections and IOs
LED
LED1 (blue) = P0.16 (active low)
Sensor
The BL654 Sensor Board has an on-board Bosch BME280 temperature/humidity/pressure sensor which is connected to the BL654 via I2C.
SCL = P0.27
SDA = P0.26
More information about the Bosch BME280 sensor can be found on the Bosch BME280 sensor website [1].
Powering the sensor
The sensor can be powered directly from a coin cell or from a voltage supplied on the UART pins, the board accepts voltage from 1.8v-3.3v. Note that if using a battery with a UART/debugger connected, the voltage of the UART/debugger (if it does not automatically sense/adjust) must be within 0.3v of the voltage of the coin cell to prevent suppression diodes in the nRF52840 silicon being activated or possible back-powering of the battery.
To power the board from an external source via UART, the solder bridge SB1 must be blobbed.
Programming and Debugging
Applications for the bl654_sensor_board board configuration can be built,
flashed, and debugged in the usual way. See Building an Application and
Run an Application for more details on building and running. An external
debugger/programmer is required which can be connected to using a Tag-Connect
TC2030-CTX cable, a Ezurio USB-SWD Programmer board or Segger JLink
programmer can be used to program and debug the BL654 sensor board.
Flashing
If using an external JLink, follow the instructions in the Nordic nRF5x Segger J-Link page to install and configure all the necessary software. Further information can be found in Flashing. Then build and flash applications as usual (see Building an Application and Run an Application for more details). If using a Ezurio USB-SWD Programmer Board, see the pyOCD website [3] to find details about the software and how to install it.
Here is an example for the Hello World application.
First, run your favorite terminal program to listen for output - note that an external UART is required to be connected to the BL654 sensor board’s UART, if using the Ezurio USB-SWD Programmer Board, the BL654 sensor board can be plugged in to the UART header. An FTDI cable can also be used - the voltage of the I/O lines and power line must be between 1.8v and 3.3v, do not connect an FTDI cable with a 5v power line to the BL654 sensor board.
J3 UART connector pinout (all pins referenced to operating voltage Vdd):
Pin No. |
Name |
Description |
Direction |
|---|---|---|---|
1 |
GND |
GND |
(N/A) |
2 |
RTS |
UART Ready-to-send pin |
OUT |
3 |
VDD |
Supply voltage (requires SB1 to be blobbed) |
(N/A) |
4 |
RXD |
UART Receive pin |
IN |
5 |
TXD |
UART Transmit pin |
(N/A) |
6 |
CTS |
UART Clear-to-send pin |
IN |
$ minicom -D <tty_device> -b 115200
Replace <tty_device> with the port where the BL654 sensor board
can be found. For example, under Linux, /dev/ttyACM0.
The BL654 sensor board needs an external programmer to program it, any SWD programmer which has a 9-pin ARM debug port can be used with a Tag-Connect TC2030-CTX cable. If using the Ezurio USB-SWD Programmer Board, connect the cable to P1 and ensure the board is set to supply power to the target at 3.3v.
J1 Tag-Connect SWD Pinout:
Pin No. |
Name |
Description |
Direction |
|---|---|---|---|
1 |
VDD |
Operating voltage |
(N/A) |
2 |
SWDIO |
Serial wire data input/output pin |
IN/OUT |
3 |
nRESET |
Module reset pin |
IN |
4 |
SWCLK |
Serial wire clock input pin |
IN |
5 |
GND |
GND |
(N/A) |
6 |
SWO |
Serial wire output pin |
OUT |
Then build and flash the application in the usual way.
# From the root of the zephyr repository
west build -b bl654_sensor_board samples/hello_world
west flash
Debugging
Refer to the Nordic nRF5x Segger J-Link page to learn about debugging Nordic based boards if using an external JLink debugger. If using a Ezurio USB-SWD Programmer Board, pyOCD can be used for debugging.
Testing Bluetooth on the BL654 Sensor Board
Many of the Bluetooth examples will work on the BL654 Sensor Board. Try them out: