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The Adafruit Feather nRF52840 Express Color Light Demo

Preperations

Required hardware

Following is needed for this demo.

  • Adafruit Feather nRF52840 Express with a JTAG header
  • Segger J-Link to flash the board
  • Conbee II or Conbee

Rust

The rust toolchain is required. See https://rustup.rs/.

probe-run

probe-run is used to flash and run the examples. It can be installed through cargo, It might need additional system libraries.

cargo install -f probe-run

To configure permissions to use the debug probe, See the probe-rs setting started guide.

deCONZ

Download and install deCONZ.

https://www.phoscon.de/en/conbee2/install

nRF5 SDK

The Cryptocell crate requires parts of the nRF5 SDK.

Download the nRF5 SDK. And follow additional instructions later.

Setup deCONZ

Connect the Conbee. Start deCONZ.

Connect using the Conbee.

Configure channel mask

The example will use channel 15. To change the channel in deCONZ, do following

  • Leave the network.
  • Change network settings, change channel mask to channel 15.
  • Save and Done.
  • Join the network again.

To verify that channel 15 is in use, open the network settings again.

Phoscon App

Click the Phoscon App button in the upper right corner. Select the Conbee and register an account.

Building the example

Get the code,

git clone https://github.com/blueluna/nrf52840-experiments.git

Unzip the nRF5 SDK archive. Then copy the external/nrf_cc310 directory into nrf52-cryptocell.

cp -r ~/Downloads/nRF5_SDK_17.1.0_ddde560/external/nrf_cc310 nrf52-cryptocell/

Build the examples.

cargo build --examples --release

Running the demo

Go into the adafruit-feather-nrf52840-express directory. Flash and run the example.

DEFMT_LOG=info cargo run --release --example feather-express-psila

The output should look as follows.

erik@computer:~/rust/nrf52840-experiments/adafruit-feather-nrf52840-express$ DEFMT_LOG=info cargo run --release --example feather-express-psila
    Finished release [optimized] target(s) in 0.03s
     Running `probe-run --probe '1366:0101' --chip nRF52840_xxAA ../nrf52840-experiments/target/thumbv7em-none-eabihf/release/examples/feather-express-psila`
(HOST) WARN  insufficient DWARF info; compile your program with `debug = 2` to enable location info
(HOST) INFO  flashing program (21 pages / 84.00 KiB)
(HOST) INFO  success!
────────────────────────────────────────────────────────────────────────────────
0 INFO  MAC: Send beacon request
1 INFO  MAC: Association failed, retry

Go to the Phoscon App.

  • Create a group.
  • Click Edit -> Manage Light in the group.
  • Click Add new light.

Add new light

Go to the program execution. The device should find the controller and associate with it.

0 INFO  MAC: Send beacon request
1 INFO  mac: Beacon 6754:0
2 INFO  MAC: Association failed, retry
3 INFO  MAC: Send beacon request
4 INFO  mac: Beacon 6754:0 permit join
5 INFO  MAC: Send association request
6 INFO  MAC: Acknowledge 3
7 INFO  MAC: Send data request
8 INFO  MAC: Acknowledge 4
9 INFO  MAC: Association Response, Success, 6754:45864
10 INFO  Key-transport key
11 INFO  > APS Set network key
12 INFO  > DP Device announce
13 INFO  APS acknowledge request, extended
14 INFO  < Queued acknowledge 43
...

Go to the Phoscon App.

The search should have found the device, add the device to the group.

Found new light

Go back to the main page. The device should appear under the Light tab. Control on/off, brightness and color here.

Control new light

Note: The device does not store the exchanged keys, this means that the device needs to re-associate when restarted.