116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
#include "shared-bindings/countio/Counter.h"
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#include "py/runtime.h"
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#include "py/mpstate.h"
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#include "shared-bindings/countio/Edge.h"
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#include "shared-bindings/digitalio/Pull.h"
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#include "common-hal/pwmio/PWMOut.h"
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#include "src/rp2_common/hardware_gpio/include/hardware/gpio.h"
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#include "src/rp2_common/hardware_pwm/include/hardware/pwm.h"
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#include "src/rp2_common/hardware_irq/include/hardware/irq.h"
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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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if (pwm_gpio_to_channel(pin->number) != PWM_CHAN_B) {
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mp_raise_RuntimeError(translate("Pin must be on PWM Channel B"));
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}
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if (edge == EDGE_RISE_AND_FALL) {
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mp_raise_NotImplementedError(translate("RISE_AND_FALL not available on this chip"));
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}
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self->pin = pin->number;
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self->slice_num = pwm_gpio_to_slice_num(self->pin);
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if (MP_STATE_PORT(counting)[self->slice_num] != NULL) {
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mp_raise_RuntimeError(translate("PWM slice already in use"));
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}
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if (!pwmio_claim_slice_ab_channels(self->slice_num)) {
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mp_raise_RuntimeError(translate("PWM slice channel A already in use"));
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}
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pwm_clear_irq(self->slice_num);
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pwm_set_irq_enabled(self->slice_num, true);
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irq_set_exclusive_handler(PWM_IRQ_WRAP, counter_interrupt_handler);
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irq_set_enabled(PWM_IRQ_WRAP, true);
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pwm_config cfg = pwm_get_default_config();
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pwm_config_set_clkdiv_mode(&cfg, edge == EDGE_RISE ? PWM_DIV_B_RISING : PWM_DIV_B_FALLING);
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pwm_init(self->slice_num, &cfg, false);
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gpio_set_function(self->pin, GPIO_FUNC_PWM);
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gpio_set_pulls(self->pin, pull == PULL_UP, pull == PULL_DOWN);
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claim_pin(pin);
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MP_STATE_PORT(counting)[self->slice_num] = self;
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self->count = 0;
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pwm_set_enabled(self->slice_num, true);
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}
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void reset_countio(void) {
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for (size_t i = 0; i < NUM_PWM_SLICES; i++) {
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if (MP_STATE_PORT(counting)[i] != NULL) {
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common_hal_countio_counter_deinit(MP_STATE_PORT(counting)[i]);
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}
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}
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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 == 0;
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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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pwm_set_enabled(self->slice_num, false);
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pwm_set_irq_enabled(self->slice_num, false);
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pwmio_release_slice_ab_channels(self->slice_num);
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reset_pin_number(self->pin);
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MP_STATE_PORT(counting)[self->slice_num] = NULL;
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self->pin = 0;
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self->slice_num = 0;
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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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self->count += pwm_get_counter(self->slice_num);
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pwm_set_counter(self->slice_num, 0);
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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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pwm_set_counter(self->slice_num, 0);
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self->count = new_count;
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}
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void counter_interrupt_handler(void) {
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uint32_t mask = pwm_get_irq_status_mask();
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uint8_t i = 1;
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uint8_t pos = 0;
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while (!(i & mask)) {
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i = i << 1;
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++pos;
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}
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countio_counter_obj_t *self = MP_STATE_PORT(counting)[pos];
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if (self != NULL) {
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pwm_clear_irq(self->slice_num);
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self->count += 65536;
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}
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}
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MP_REGISTER_ROOT_POINTER(mp_obj_t counting[enum_NUM_PWM_SLICES]);
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