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.

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

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.

You can see what the project window is split into.

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.

The next section is the SysTick_Handler function that toggles the red LED on the board.

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.

The main function starts by calling the initialization function.

The initialization function can be found in the hardware_init.c file.

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).

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.