Blinky¶

Overview¶

The Blinky sample blinks an LED forever using the GPIO API.

The source code shows how to:

• Get a pin specification from the devicetree as a gpio_dt_spec
• Configure the GPIO pin as an output
• Toggle the pin forever

Requirements¶

Before you start, check that you have the required hardware and software:

• 1x nRF54L15 Connect Kit
• 1x USB-C Cable
• A computer running macOS, Ubuntu, or Windows 10 or newer

Building the sample¶

To build the sample, follow the instructions in Getting Started Guide to set up your preferred building environment.

Use the following steps to build the Blinky sample on the command line.

1. Open a terminal window.

2. Go to NCS-Project/nrf54l15-connectkit repository cloned in the Getting Started Guide.

3. Build the sample using the west build command, specifying the board (following the -b option) as nrf54l15_connectkit/nrf54l15/cpuapp.

   west build -p always -b nrf54l15_connectkit/nrf54l15/cpuapp samples/blinky
   

   Tip

   The -p always option forces a pristine build, and is recommended for new users. Users may also use the -p auto option, which will use heuristics to determine if a pristine build is required, such as when building another sample.

4. After building the sample successfully, the firmware with the name merged.hex can be found in the build directory.

Flashing the firmware¶

Connect the nRF54L15 Connect Kit to the computer with a USB-C cable:

Then flash the sample using west flash:

west flash

pyocd load --target nrf54l --frequency 4000000 build/merged.hex

Testing¶

1. After flashing the firmware to your board, the Green LED starts to blink.

   

2. Open up a serial terminal, specifying the primary COM port that your computer uses to communicate with the nRF54L15:

   WindowsmacOSUbuntu

   1. Start PuTTY.

   2. Configure the correct serial port and click Open:

      

   Open up a terminal and run:

   screen <serial-port-name> 115200
   

   Open up a terminal and run:

   screen <serial-port-name> 115200
   

3. Observe the output of the terminal. You should see the output, similar to what is shown in the following:

   Terminal
   1 2 3 4 5 6 7 8 9 10	*** Booting nRF Connect SDK v3.1.0-6c6e5b32496e *** *** Using Zephyr OS v4.1.99-1612683d4010 *** LED state: OFF LED state: ON LED state: OFF LED state: ON LED state: OFF LED state: ON LED state: OFF ...