The four buttons and four LEDs on the nRF5340 PDK 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.
The buttons are active low, meaning that the input will be 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 an input with an internal pull-up resistor.
The LEDs are active low, meaning that writing a logical zero ('0') to the output pin will illuminate the LED.