2.6 KiB
Nordic nRF52840-DK board
Flashing using JTAG
The development board comes with its own JTAG port, so the default programmer is the easiest and most convenient. You can flash OpenSK with these steps:
-
Connect a micro USB cable to the JTAG USB port.
-
Run our script for compiling/flashing Tock OS and OpenSK on your device:
./deploy.py --board=nrf52840dk_opensk --opensk -
Connect a micro USB cable to the device USB port.
Note: Due to current limitations of our implementation and Tock, you may
have to press the BOOT/RESET button, located next to the device USB port on
the board in order to see your OpenSK device on your system.
Buttons and LEDs
Out of the 5 buttons, the group of 4 behaves identically. They all convey user presence to the application. Some actions like register and login will make the board blink, asking you to confirm the transaction with a button press. The remaining fifth button restarts the board.
The group of 4 LEDs on the right show the state of the app. There are different patterns:
| Pattern | Cause |
|---|---|
| LED1 slow blink | kernel panic |
| all LEDs blinking together | app panic |
| LED1+4 and LED2+3 fast alternating | asking for touch |
| fast swirling | wink (just saying Hi!) |
| circle | allocator panic |
The LEDs closer to the JTAG port indicates the power and debugging state.
There are 3 switches that need to be in the correct position:
- Power (bottom left): On
- nRF power source (center left): VDD
- SW6 (top right): DEFAULT
Upgradability
There are variants of the board that introduce A/B partitions for upgrading the firmware. You can bootstrap an upgradable board using one of the two commands:
./deploy.py --board=nrf52840dk_opensk_a --opensk
./deploy.py --board=nrf52840dk_opensk_b --opensk
Afterwards, you can upgrade the other partition with
./tools/perform_upgrade.sh nrf52840dk_opensk_b
./tools/perform_upgrade.sh nrf52840dk_opensk_a
respectively. You can only upgrade the partition that is not currently running,
so always alternate your calls to perform_upgrade.sh. Otherwise, this script
works like deploy.py. You can call it even after you locked down your device,
to deploy changes to your development board.