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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

References

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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 instancetwr_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 bootvoid 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);}