# Dive into the LED blinky demo

First let's create a Workspace Folder. Launch workspace where you want to locate it. Keep in mind that workspace switching restarts IDE.

<figure><img src="/files/aESlWi9K63ed9FRc6NCi" alt=""><figcaption></figcaption></figure>

Close the Welcome page and select "Import SDK example(s)...". Select the correct MCXN947 board and press "Next".

<figure><img src="/files/zbP1ewjHI36mh9ohXmue" alt=""><figcaption></figcaption></figure>

Now from the Import Wizard, drop down on the demo\_apps section and select the "led\_blinky" application. Then press "Finish" and wait for the project to open.

<figure><img src="/files/RcIM4BrcGBWgjclg1iGr" alt=""><figcaption></figcaption></figure>

You can see what the project window is split into.

<figure><img src="/files/5yGXEF86gsKCCQHTCAGR" alt=""><figcaption></figcaption></figure>

Let's take a look at the code. The top part of the code contains the includes files present in the project tree and visible in the Project Explorer tab.

<figure><img src="/files/53p1019MLk3xkX7X8cTN" alt=""><figcaption></figcaption></figure>

The next section is the SysTick\_Handler function that toggles the red LED on the board.

<figure><img src="/files/VTjYHiJxsjAz0uxYmZHg" alt=""><figcaption></figcaption></figure>

This function will be periodically called to switch ON and OFF the LED. Ctrl + click on the GPIO\_PortToggle function opens the declaration present in fsl\_gpio.h header file.

<figure><img src="/files/0VvM5v5p1TlvylCiK5Cd" alt=""><figcaption></figcaption></figure>

The main function starts by calling the initialization function.

<figure><img src="/files/5ImHyFYl4UuAsZERnQeh" alt=""><figcaption></figcaption></figure>

The initialization function can be found in the hardware\_init.c file.

<figure><img src="/files/gBrEOYoqD5iZSZTGBJEz" alt=""><figcaption></figcaption></figure>

This function enables a clock and initializes the board pinds. Then the BOARD\_BootClockFRO12M() sets the clock frequency to 12 MHz. SysTick\_Config(12000000UL) sets a counter with a value of 12.000.000 that makes the LED blink once per second. More on timers will be covered later. Changing the counter value will increase/decrease the blinking frequency but note that it needs to be slow enough for the human eye to notice it. LED\_RED\_INIT(LOGIC\_LED\_OFF) calls GPIO\_PinWrite() that changes the output of the GPIO (in this case to the OFF state).

<figure><img src="/files/0qZoAnF0TyneBauZwJFL" alt=""><figcaption></figcaption></figure>

Now let's divo into how to build and download the code on your board.

In order to build a project, have it selected and then either click on the "build icon" in the shortcuts provided above or by clicking "Build" in the Quickstart Panel.

<figure><img src="/files/OJ5f2VMbwG7NZSEoOden" alt=""><figcaption></figcaption></figure>

The project should finish the build without any errors or warnings in the console.

<figure><img src="/files/aJ7Npwln4gQrDZH0bTzG" alt=""><figcaption></figcaption></figure>

For the download step, make sure your board is connected to the computer through the J17 'MCU-LINK' port.

<figure><img src="/files/nQIEJjoTIqR6luWh8bBr" alt=""><figcaption></figcaption></figure>

Download the application to your board by either cliking on the "debug" icon above or clicking "Debug" in the Quickstart Panel.

<figure><img src="/files/vP4ccNNdgGAMeRDEkSMC" alt=""><figcaption></figcaption></figure>

In the next window, select the MCU-LINK CMSIS-DAP debug probe.

<figure><img src="/files/62uRreQHzvBBI5pOJrN3" alt=""><figcaption></figcaption></figure>

To run the application, press the "run" icon.

<figure><img src="/files/U1UWuQ1JqXGklobUuIbm" alt=""><figcaption></figcaption></figure>


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