main_freertos.c File Reference

FreeRTOS-based LED test application for the Pico 2 W board. More...

#include "pico/stdlib.h"
#include <assert.h>
#include <stdio.h>
#include <FreeRTOS.h>
#include <task.h>

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Macros
#define	LED_DELAY_MS   100

Functions
int	pico_led_init (void)
	Initialize the board-specific LED backend.
void	pico_set_led (bool led_on)
	Set the onboard LED state.
static void	led_task (void *argument)
	FreeRTOS task that blinks the onboard LED at LED_DELAY_MS.
static void	log_task (void *argument)
	Low-priority FreeRTOS task for periodic logging.
int	main ()
	Application entry point.

Detailed Description

FreeRTOS-based LED test application for the Pico 2 W board.

This C source is intended for testing a Pico 2 W board by blinking the onboard LED using the Pico C SDK and FreeRTOS. It configures LED control for either:

• boards with a direct LED GPIO (PICO_DEFAULT_LED_PIN), or
• Pico W style boards where the LED is controlled through the CYW43 Wi-Fi chip (CYW43_WL_GPIO_LED_PIN).

Two FreeRTOS tasks are created:

• led_task(): toggles the LED periodically.
• log_task(): prints a periodic low-priority status message.

Macro Definition Documentation

LED_DELAY_MS

#define LED_DELAY_MS   100

Function Documentation

led_task()

static void led_task ( void *  argument )

static

FreeRTOS task that blinks the onboard LED at LED_DELAY_MS.

Usage:

• Created from main() using xTaskCreate().
• Runs forever and alternates LED ON/OFF with vTaskDelay().

Parameters

argument

Unused task argument.

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log_task()

static void log_task ( void *  argument )

static

Low-priority FreeRTOS task for periodic logging.

Usage:

• Created from main() with lower priority than led_task().
• Runs forever and prints a heartbeat log every 1 second.

Parameters

argument

Unused task argument.

main()

int main

(

void

)

Application entry point.

Startup sequence:

1. Initialize stdio (stdio_init_all()).
2. Initialize LED backend (pico_led_init()).
3. Create FreeRTOS tasks (led_task() and log_task()).
4. Start scheduler (vTaskStartScheduler()).

Usage:

• Build this target with Pico SDK + FreeRTOS support.
• Flash to supported hardware (including Pico 2 W) to validate LED and scheduler/task behavior.

Returns

Never returns under normal operation.

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pico_led_init()

int pico_led_init

(

void

)

Initialize the board-specific LED backend.

Usage:

• Call once during startup before any call to pico_set_led().
• In main(), the return value is checked with hard_assert() to ensure initialization succeeded.

Returns

PICO_OK on success for GPIO-based boards, or the result of cyw43_arch_init() for Pico W style boards.

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pico_set_led()

void pico_set_led

(

bool

led_on

)

Set the onboard LED state.

This function abstracts the hardware difference between direct GPIO LED control and CYW43-controlled LED GPIO on Pico W style boards.

Usage:

• Call after pico_led_init() succeeds.
• Pass true to turn the LED on, false to turn it off.

Parameters

led_on

Desired LED state (true = on, false = off).

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