95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
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#include "common-hal/countio/Counter.h"
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#include "shared-bindings/countio/Counter.h"
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#include "py/runtime.h"
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#include "nrfx_gpiote.h"
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// obj array to map pin number -> self since nrfx hide the mapping
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static countio_counter_obj_t *_countio_objs[NUMBER_OF_PINS];
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static void _intr_handler(nrfx_gpiote_pin_t pin, nrf_gpiote_polarity_t action) {
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countio_counter_obj_t *self = _countio_objs[pin];
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if (!self) {
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return;
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}
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self->count += 1;
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}
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void common_hal_countio_counter_construct(countio_counter_obj_t *self,
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const mcu_pin_obj_t *pin, countio_edge_t edge, digitalio_pull_t pull) {
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self->pin = pin->number;
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_countio_objs[self->pin] = self;
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self->count = 0;
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nrf_gpiote_polarity_t polarity = NRF_GPIOTE_POLARITY_TOGGLE;
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switch (edge) {
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case EDGE_RISE:
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polarity = NRF_GPIOTE_POLARITY_LOTOHI;
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break;
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case EDGE_FALL:
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polarity = NRF_GPIOTE_POLARITY_HITOLO;
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break;
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case EDGE_RISE_AND_FALL:
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default:
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break;
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}
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nrf_gpio_pin_pull_t hal_pull = NRF_GPIO_PIN_NOPULL;
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switch (pull) {
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case PULL_UP:
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hal_pull = NRF_GPIO_PIN_PULLUP;
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break;
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case PULL_DOWN:
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hal_pull = NRF_GPIO_PIN_PULLDOWN;
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break;
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case PULL_NONE:
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default:
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break;
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}
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nrfx_gpiote_in_config_t cfg = {
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.sense = polarity,
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.pull = hal_pull,
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.is_watcher = false,
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.hi_accuracy = true,
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.skip_gpio_setup = false,
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};
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nrfx_err_t err = nrfx_gpiote_in_init(self->pin, &cfg, _intr_handler);
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if (err != NRFX_SUCCESS) {
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mp_raise_RuntimeError(translate("All channels in use"));
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}
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nrfx_gpiote_in_event_enable(self->pin, true);
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claim_pin(pin);
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}
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bool common_hal_countio_counter_deinited(countio_counter_obj_t *self) {
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return self->pin == NO_PIN;
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}
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void common_hal_countio_counter_deinit(countio_counter_obj_t *self) {
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if (common_hal_countio_counter_deinited(self)) {
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return;
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}
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_countio_objs[self->pin] = NULL;
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nrfx_gpiote_in_event_disable(self->pin);
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nrfx_gpiote_in_uninit(self->pin);
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reset_pin_number(self->pin);
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self->pin = NO_PIN;
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}
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mp_int_t common_hal_countio_counter_get_count(countio_counter_obj_t *self) {
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return self->count;
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}
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void common_hal_countio_counter_set_count(countio_counter_obj_t *self,
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mp_int_t new_count) {
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self->count = new_count;
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}
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