25.8.2.1.3 Workflow
- Create a module software instance structure for the TCC module to store the TCC driver state while it is in use.
struct
tcc_module tcc_instance;
Note: This should never go out of scope as long as the module is in use. In most cases, this should be global. - Configure the TCC module.
- 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);
Note: This should always be performed before using the configuration struct to ensure that all values are initialized to known default settings. - Alter the TCC settings to configure the counter width, wave generation mode and the compare channel 0 value.
config_tcc.counter.clock_prescaler = TCC_CLOCK_PRESCALER_DIV1024;
config_tcc.counter.period = 8000;
config_tcc.compare.wave_generation = TCC_WAVE_GENERATION_SINGLE_SLOPE_PWM;
config_tcc.compare.match[CONF_PWM_CHANNEL] = (8000 / 4);
- 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);
- Set to compare buffer value and enable circular of double buffered compare values.
tcc_set_compare_value(&tcc_instance,
(
enum
tcc_match_capture_channel)CONF_PWM_CHANNEL, 8000*3/4);
tcc_enable_circular_buffer_compare(&tcc_instance,
(
enum
tcc_match_capture_channel)CONF_PWM_CHANNEL);
- Enable the TCC module to start the timer and begin PWM signal generation.
tcc_enable(&tcc_instance);