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#include "common-hal/countio/Counter.h"
#include "atmel_start_pins.h"
#include "eic_handler.h"
#include "samd/external_interrupts.h"
#include "py/runtime.h"
#include "supervisor/shared/translate.h"
void common_hal_countio_counter_construct(countio_counter_obj_t* self,
const mcu_pin_obj_t* pin_a) {
if (!pin_a->has_extint) {
mp_raise_RuntimeError(translate("Pin must support hardware interrupts"));
}
if (eic_get_enable()) {
if (!eic_channel_free(pin_a->extint_channel)) {
mp_raise_RuntimeError(translate("A hardware interrupt channel is already in use"));
}
} else {
turn_on_external_interrupt_controller();
}
// These default settings apply when the EIC isn't yet enabled.
self->eic_channel_a = pin_a->extint_channel;
self->pin_a = pin_a->number;
gpio_set_pin_function(self->pin_a, GPIO_PIN_FUNCTION_A);
gpio_set_pin_pull_mode(self->pin_a, GPIO_PULL_UP);
set_eic_channel_data(self->eic_channel_a, (void*) self);
self->count = 0;
claim_pin(pin_a);
set_eic_handler(self->eic_channel_a, EIC_HANDLER_COUNTER);
turn_on_eic_channel(self->eic_channel_a, EIC_CONFIG_SENSE0_FALL_Val);
}
bool common_hal_countio_counter_deinited(countio_counter_obj_t* self) {
return self->pin_a == NO_PIN;
}
void common_hal_countio_counter_deinit(countio_counter_obj_t* self) {
if (common_hal_countio_counter_deinited(self)) {
return;
}
set_eic_handler(self->eic_channel_a, EIC_HANDLER_NO_INTERRUPT);
turn_off_eic_channel(self->eic_channel_a);
reset_pin_number(self->pin_a);
self->pin_a = NO_PIN;
}
mp_int_t common_hal_countio_counter_get_count(countio_counter_obj_t* self) {
return self->count;
}
void common_hal_countio_counter_set_count(countio_counter_obj_t* self,
mp_int_t new_count) {
self->count = new_count;
}
void common_hal_countio_counter_reset(countio_counter_obj_t* self){
self->count = 0;
}
void counter_interrupt_handler(uint8_t channel) {
countio_counter_obj_t* self = get_eic_channel_data(channel);
self->count += 1;
}
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