25.8.6.1.2 Code

SAM D21 Xplained Pro.

#define CONF_PWM_MODULE      LED_0_PWM4CTRL_MODULE

#define CONF_PWM_CHANNEL     LED_0_PWM4CTRL_CHANNEL

#define CONF_PWM_OUTPUT      LED_0_PWM4CTRL_OUTPUT

#define CONF_PWM_OUT_PIN     LED_0_PWM4CTRL_PIN

#define CONF_PWM_OUT_MUX     LED_0_PWM4CTRL_MUX

#define CONF_FAULT_EIC_PIN       SW0_EIC_PIN

#define CONF_FAULT_EIC_PIN_MUX   SW0_EIC_PINMUX

#define CONF_FAULT_EIC_LINE      SW0_EIC_LINE

#define CONF_FAULT_EVENT_GENERATOR EVSYS_ID_GEN_EIC_EXTINT_15

#define CONF_FAULT_EVENT_USER      EVSYS_ID_USER_TCC0_MC_0

SAM R21 Xplained Pro.

#define CONF_PWM_MODULE      TCC1

#define CONF_PWM_CHANNEL     0

#define CONF_PWM_OUTPUT      0

#define CONF_PWM_OUT_PIN     PIN_PA06E_TCC1_WO0

#define CONF_PWM_OUT_MUX     MUX_PA06E_TCC1_WO0

#define CONF_FAULT_EIC_PIN       SW0_EIC_PIN

#define CONF_FAULT_EIC_PIN_MUX   SW0_EIC_PINMUX

#define CONF_FAULT_EIC_LINE      SW0_EIC_LINE

#define CONF_FAULT_EVENT_GENERATOR EVSYS_ID_GEN_EIC_EXTINT_8

#define CONF_FAULT_EVENT_USER      EVSYS_ID_USER_TCC1_MC_0

SAM L21 Xplained Pro.

#define CONF_PWM_MODULE      LED_0_PWM4CTRL_MODULE

#define CONF_PWM_CHANNEL     LED_0_PWM4CTRL_CHANNEL

#define CONF_PWM_OUTPUT      LED_0_PWM4CTRL_OUTPUT

#define CONF_PWM_OUT_PIN     LED_0_PWM4CTRL_PIN

#define CONF_PWM_OUT_MUX     LED_0_PWM4CTRL_MUX

#define CONF_FAULT_EIC_PIN       SW0_EIC_PIN

#define CONF_FAULT_EIC_PIN_MUX   SW0_EIC_PINMUX

#define CONF_FAULT_EIC_LINE      SW0_EIC_LINE

#define CONF_FAULT_EVENT_GENERATOR EVSYS_ID_GEN_EIC_EXTINT_2

#define CONF_FAULT_EVENT_USER      EVSYS_ID_USER_TCC0_MC_0

SAM L22 Xplained Pro.

#define CONF_PWM_MODULE      TCC0

#define CONF_PWM_CHANNEL     0

#define CONF_PWM_OUTPUT      0

#define CONF_PWM_OUT_PIN     PIN_PB18F_TCC0_WO0

#define CONF_PWM_OUT_MUX     MUX_PB18F_TCC0_WO0

#define CONF_FAULT_EIC_PIN       SW0_EIC_PIN

#define CONF_FAULT_EIC_PIN_MUX   SW0_EIC_PINMUX

#define CONF_FAULT_EIC_LINE      SW0_EIC_LINE

#define CONF_FAULT_EVENT_GENERATOR EVSYS_ID_GEN_EIC_EXTINT_9

#define CONF_FAULT_EVENT_USER      EVSYS_ID_USER_TCC0_MC_0

SAM DA1 Xplained Pro.

#define CONF_PWM_MODULE      LED_0_PWM4CTRL_MODULE

#define CONF_PWM_CHANNEL     LED_0_PWM4CTRL_CHANNEL

#define CONF_PWM_OUTPUT      LED_0_PWM4CTRL_OUTPUT

#define CONF_PWM_OUT_PIN     LED_0_PWM4CTRL_PIN

#define CONF_PWM_OUT_MUX     LED_0_PWM4CTRL_MUX

#define CONF_FAULT_EIC_PIN       SW0_EIC_PIN

#define CONF_FAULT_EIC_PIN_MUX   SW0_EIC_PINMUX

#define CONF_FAULT_EIC_LINE      SW0_EIC_LINE

#define CONF_FAULT_EVENT_GENERATOR EVSYS_ID_GEN_EIC_EXTINT_15

#define CONF_FAULT_EVENT_USER      EVSYS_ID_USER_TCC0_MC_0

SAM C21 Xplained Pro:

#define CONF_PWM_MODULE      LED_0_PWM4CTRL_MODULE

#define CONF_PWM_CHANNEL     LED_0_PWM4CTRL_CHANNEL

#define CONF_PWM_OUTPUT      LED_0_PWM4CTRL_OUTPUT

#define CONF_PWM_OUT_PIN     LED_0_PWM4CTRL_PIN

#define CONF_PWM_OUT_MUX     LED_0_PWM4CTRL_MUX

#define CONF_FAULT_EIC_PIN       SW0_EIC_PIN

#define CONF_FAULT_EIC_PIN_MUX   SW0_EIC_PINMUX

#define CONF_FAULT_EIC_LINE      SW0_EIC_LINE

#define CONF_FAULT_EVENT_GENERATOR EVSYS_ID_GEN_EIC_EXTINT_8

#define CONF_FAULT_EVENT_USER      EVSYS_ID_USER_TCC0_EV_0

Add to the main application source file, before any functions:

#include <string.h>

Add to the main application source file, outside of any functions:

struct tcc_module tcc_instance;

struct events_resource event_resource;

Copy-paste the following callback function code to your user application:

static void tcc_callback_to_change_duty_cycle(
        struct tcc_module *const module_inst)
{
    static uint32_t delay = 10;
    static uint32_t i = 0;

    if (--delay) {
        return;
    }
    delay = 10;
    i = (i + 0x0800) & 0xFFFF;
    tcc_set_compare_value(module_inst,
            (enum tcc_match_capture_channel)
                    (TCC_MATCH_CAPTURE_CHANNEL_0 + CONF_PWM_CHANNEL),
            i + 1);
}

static void eic_callback_to_clear_halt(void)
{
    if (port_pin_get_input_level(CONF_FAULT_EIC_PIN)) {
        tcc_clear_status(&tcc_instance,
                TCC_STATUS_RECOVERABLE_FAULT_OCCUR(CONF_PWM_CHANNEL));
    }
}

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

static void configure_tcc(void)
{
    struct tcc_config config_tcc;
    tcc_get_config_defaults(&config_tcc, CONF_PWM_MODULE);

    config_tcc.counter.period = 0xFFFF;
    config_tcc.compare.wave_generation = TCC_WAVE_GENERATION_SINGLE_SLOPE_PWM;
    config_tcc.compare.match[CONF_PWM_CHANNEL] = 0xFFFF;
    config_tcc.wave_ext.recoverable_fault[CONF_PWM_CHANNEL].source =
            TCC_FAULT_SOURCE_ENABLE;
    config_tcc.wave_ext.recoverable_fault[CONF_PWM_CHANNEL].halt_action =
            TCC_FAULT_HALT_ACTION_SW_HALT;
    config_tcc.pins.enable_wave_out_pin[CONF_PWM_OUTPUT] = true;
    config_tcc.pins.wave_out_pin[CONF_PWM_OUTPUT]        = CONF_PWM_OUT_PIN;
    config_tcc.pins.wave_out_pin_mux[CONF_PWM_OUTPUT]    = CONF_PWM_OUT_MUX;

    tcc_init(&tcc_instance, CONF_PWM_MODULE, &config_tcc);

    struct tcc_events events;
    memset(&events, 0, sizeof(struct tcc_events));

    events.on_event_perform_channel_action[CONF_PWM_CHANNEL] = true;

    tcc_enable_events(&tcc_instance, &events);

    tcc_enable(&tcc_instance);
}

static void configure_tcc_callbacks(void)
{
    tcc_register_callback(
            &tcc_instance,
            tcc_callback_to_change_duty_cycle,
            (enum tcc_callback)(TCC_CALLBACK_CHANNEL_0 + CONF_PWM_CHANNEL));

    tcc_enable_callback(&tcc_instance,
            (enum tcc_callback)(TCC_CALLBACK_CHANNEL_0 + CONF_PWM_CHANNEL));
}

static void configure_eic(void)
{
    struct extint_chan_conf config;
    extint_chan_get_config_defaults(&config);
    config.filter_input_signal = true;
    config.detection_criteria  = EXTINT_DETECT_BOTH;
    config.gpio_pin     = CONF_FAULT_EIC_PIN;
    config.gpio_pin_mux = CONF_FAULT_EIC_PIN_MUX;
    extint_chan_set_config(CONF_FAULT_EIC_LINE, &config);

    struct extint_events events;
    memset(&events, 0, sizeof(struct extint_events));
    events.generate_event_on_detect[CONF_FAULT_EIC_LINE] = true;
    extint_enable_events(&events);

    extint_register_callback(eic_callback_to_clear_halt,
            CONF_FAULT_EIC_LINE, EXTINT_CALLBACK_TYPE_DETECT);
    extint_chan_enable_callback(CONF_FAULT_EIC_LINE,
            EXTINT_CALLBACK_TYPE_DETECT);
}

static void configure_event(void)
{
    struct events_config config;

    events_get_config_defaults(&config);

    config.generator = CONF_FAULT_EVENT_GENERATOR;
    config.path      = EVENTS_PATH_ASYNCHRONOUS;

    events_allocate(&event_resource, &config);

    events_attach_user(&event_resource, CONF_FAULT_EVENT_USER);
}

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

configure_tcc();
configure_tcc_callbacks();

configure_eic();
configure_event();