9.8.2.1.2 Code

Copy-paste the following setup code to your user application:

void configure_extint_channel(void)
{
    struct extint_chan_conf config_extint_chan;
    extint_chan_get_config_defaults(&config_extint_chan);

    config_extint_chan.gpio_pin           = BUTTON_0_EIC_PIN;
    config_extint_chan.gpio_pin_mux       = BUTTON_0_EIC_MUX;
    config_extint_chan.gpio_pin_pull      = EXTINT_PULL_UP;
    config_extint_chan.detection_criteria = EXTINT_DETECT_BOTH;
    extint_chan_set_config(BUTTON_0_EIC_LINE, &config_extint_chan);
}

void configure_extint_callbacks(void)
{
    extint_register_callback(extint_detection_callback,
            BUTTON_0_EIC_LINE,
            EXTINT_CALLBACK_TYPE_DETECT);
    extint_chan_enable_callback(BUTTON_0_EIC_LINE,
            EXTINT_CALLBACK_TYPE_DETECT);
}

void extint_detection_callback(void)
{
    bool pin_state = port_pin_get_input_level(BUTTON_0_PIN);
    port_pin_set_output_level(LED_0_PIN, pin_state);
}

Add to user application initialization (typically the start of main()):

configure_extint_channel();
configure_extint_callbacks();

system_interrupt_enable_global();