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_NON_RECOVERABLE_FAULT_OCCUR(0));
}
}
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.non_recoverable_fault[0].output = TCC_FAULT_STATE_OUTPUT_1;
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_input_event_perform_action[0] = true;
events.input_config[0].modify_action = true;
events.input_config[0].action = TCC_EVENT_ACTION_NON_RECOVERABLE_FAULT;
tcc_enable_events(&tcc_instance, &events);
tcc_enable(&tcc_instance);
}
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();