How To: LED Control

Controlling the LED integrated into Core Module is like printing Hello world. In this chapter, we will go over some simple examples of how to do that

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In this simple example, the LED will be initialized and then it will blink continuously for the whole program runtime.

Simple Blinking LED Code Example

#include <application.h>

twr_led_t led;

void application_init(void)
{
    twr_led_init(&led, TWR_GPIO_LED, false, false);
    twr_led_set_mode(&led, TWR_LED_MODE_BLINK);
}

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This second example uses Core Module integrated Button to switch the LED ON/OFF.

Also, the LED will blink at the start of the program. This is useful for most firmware, it is a good indicator that the code started well.

Button Controlled LED Code Example

#include <application.h>

// LED instance
twr_led_t led;

twr_button_t button;

void button_event_handler(twr_button_t *self, twr_button_event_t event, void *event_param)
{
    if (event == TWR_BUTTON_EVENT_PRESS)
    {
        twr_led_set_mode(&led, TWR_LED_MODE_TOGGLE);
    }
}

// Application initialization function which is called once after boot
void application_init(void)
{
    // Initialize LED
    twr_led_init(&led, TWR_GPIO_LED, false, 0);
    twr_led_pulse(&led, 2000);

    twr_button_init(&button, TWR_GPIO_BUTTON, TWR_GPIO_PULL_DOWN, 0);
    twr_button_set_event_handler(&button, button_event_handler, NULL);
}

References​

References