25.8.6.1.2 Code
Add to the main application source file, before any functions, according to the kit used:
- 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
Add to the main application source file, before any functions:#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, outside of any functions:#include <string.h>
struct
tcc_module tcc_instance;
Copy-paste the following callback function code to your user application:struct
events_resource event_resource;
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);
}
Copy-paste the following setup code to your user application: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));
}
}
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);
}
Add to user application initialization (typically the start of main()):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);
}
configure_tcc();
configure_tcc_callbacks();
configure_eic();
configure_event();