Configure TCC

Create a module software instance struct for the TCC module to store the TCC driver state while it is in use.

struct tcc_module tcc_instance;

Create a TCC module configuration struct, which can be filled out to adjust the configuration of a physical TCC peripheral.

struct tcc_config config_tcc;

Initialize the TCC configuration struct with the module's default values.

tcc_get_config_defaults(&config_tcc, CONF_PWM_MODULE);

Alter the TCC settings to configure the counter width, wave generation mode and the compare channel 0 value and fault options. Here the Recoverable Fault input is enabled and halt action is set to software mode (must use software to clear halt state).

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;

Alter the TCC settings to configure the PWM output on a physical device pin.

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;

Configure the TCC module with the desired settings.

tcc_init(&tcc_instance, CONF_PWM_MODULE, &config_tcc);

Create a TCC events configuration struct, which can be filled out to enable/disable events and configure event settings. Reset all fields to zero.

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

Alter the TCC events settings to enable/disable desired events, to change event generating options and modify event actions. Here channel event 0 input is enabled as source of recoverable fault.

events.on_event_perform_channel_action[CONF_PWM_CHANNEL] = true;

Enable and apply events settings.

tcc_enable_events(&tcc_instance, &events);

Enable the TCC module to start the timer and begin PWM signal generation.

tcc_enable(&tcc_instance);

Register the Compare Channel 0 Match callback functions with the driver.

tcc_register_callback(
        &tcc_instance,
        tcc_callback_to_change_duty_cycle,
        (enum tcc_callback)(TCC_CALLBACK_CHANNEL_0 + CONF_PWM_CHANNEL));

Enable the Compare Channel 0 Match callback so that it will be called by the driver when appropriate.

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