The four buttons and four LEDs on the nRF5340 DK are connected to dedicated GPIOs on the nRF5340 System on Chip (SoC).
| Part | GPIO | Solder bridge |
|---|---|---|
| Button 1 | P0.23 | - |
| Button 2 | P0.24 | - |
| Button 3 | P0.08 | - |
| Button 4 | P0.09 | - |
| LED 1 | P0.28 | SB5 |
| LED 2 | P0.29 | SB6 |
| LED 3 | P0.30 | SB7 |
| LED 4 | P0.31 | SB8 |
If P0.28–P0.31 are needed elsewhere, the LEDs can be disconnected by cutting the short on SB5–SB8. See Disconnecting the LEDs for more information.
Figure 1. Disconnecting the LEDs
The buttons are active low, meaning that the input is connected to ground when the button is activated. The buttons have no external pull-up resistor, and therefore, to use the buttons, the P0.08, P0.09, P0.23, P0.24 pins must be configured as input with an internal pull-up resistor.
The LEDs are active low, meaning that writing a logical zero (0) to the output pin illuminates the LED.
Figure 2. Button and LED configuration
