circuitpython/ports/esp8266/common-hal/pulseio/PulseIn.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdint.h>
#include <user_interface.h>
#include <eagle_soc.h>
#include "esp_mphal.h"
#include "mpconfigport.h"
#include "py/gc.h"
#include "py/runtime.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "shared-bindings/pulseio/PulseIn.h"
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#include "supervisor/shared/translate.h"
#include "common-hal/microcontroller/__init__.h"
static void pulsein_set_interrupt(pulseio_pulsein_obj_t *self, bool rising, bool falling) {
ETS_GPIO_INTR_DISABLE();
// Set interrupt mode
GPIO_REG_WRITE(
GPIO_PIN_ADDR(self->pin->gpio_number),
(GPIO_REG_READ(GPIO_PIN_ADDR(self->pin->gpio_number) & ~GPIO_PIN_INT_TYPE_MASK)) |
GPIO_PIN_INT_TYPE_SET(
(rising ? GPIO_PIN_INTR_POSEDGE : 0) | (falling ? GPIO_PIN_INTR_NEGEDGE : 0)
)
);
// Clear interrupt status
GPIO_REG_WRITE(GPIO_STATUS_W1TC_ADDRESS, 1 << self->pin->gpio_number);
ETS_GPIO_INTR_ENABLE();
}
void pulseio_pulsein_interrupt_handler(void *data) {
pulseio_pulsein_obj_t *self = data;
uint32_t time_us = system_get_time();
if (self->first_edge) {
self->first_edge = false;
pulsein_set_interrupt(self, true, true);
} else {
uint16_t elapsed_us = (uint16_t)(time_us - self->last_us);
uint16_t i = (self->start + self->len) % self->maxlen;
self->buffer[i] = elapsed_us;
if (self->len < self->maxlen) {
self->len++;
} else {
self->start++;
}
}
self->last_us = time_us;
}
void common_hal_pulseio_pulsein_construct(pulseio_pulsein_obj_t* self,
const mcu_pin_obj_t* pin, uint16_t maxlen, bool idle_state) {
if (pin->gpio_number == NO_GPIO || pin->gpio_function == SPECIAL_CASE) {
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mp_raise_msg_varg(&mp_type_ValueError, translate("No PulseIn support for %q"), pin->name );
}
PIN_FUNC_SELECT(pin->peripheral, pin->gpio_function);
PIN_PULLUP_DIS(pin->peripheral);
self->pin = pin;
self->buffer = (uint16_t *) m_malloc(maxlen * sizeof(uint16_t), false);
if (self->buffer == NULL) {
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mp_raise_msg_varg(&mp_type_MemoryError, translate("Failed to allocate RX buffer of %d bytes"), maxlen * sizeof(uint16_t));
}
self->maxlen = maxlen;
self->idle_state = idle_state;
self->start = 0;
self->len = 0;
self->first_edge = true;
self->last_us = 0;
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self->paused = false;
microcontroller_pin_register_intr_handler(self->pin->gpio_number,
pulseio_pulsein_interrupt_handler, (void *)self);
pulsein_set_interrupt(self, !idle_state, idle_state);
}
bool common_hal_pulseio_pulsein_deinited(pulseio_pulsein_obj_t* self) {
return self->buffer == NULL;
}
void common_hal_pulseio_pulsein_deinit(pulseio_pulsein_obj_t* self) {
pulsein_set_interrupt(self, false, false);
microcontroller_pin_register_intr_handler(self->pin->gpio_number, NULL, NULL);
PIN_FUNC_SELECT(self->pin->peripheral, 0);
m_free(self->buffer);
self->buffer = NULL;
}
void common_hal_pulseio_pulsein_pause(pulseio_pulsein_obj_t* self) {
pulsein_set_interrupt(self, false, false);
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self->paused = true;
}
void common_hal_pulseio_pulsein_resume(pulseio_pulsein_obj_t* self,
uint16_t trigger_duration) {
// Make sure we're paused.
common_hal_pulseio_pulsein_pause(self);
// Send the trigger pulse.
if (trigger_duration > 0) {
uint32_t mask = 1 << self->pin->gpio_number;
// switch pin to an output with state opposite idle state
gpio_output_set(self->idle_state ? 0 : mask, self->idle_state ? mask : 0, 0, 0);
gpio_output_set(0, 0, mask, 0);
common_hal_mcu_delay_us((uint32_t)trigger_duration);
// switch pin back to an open input
gpio_output_set(0, 0, 0, mask);
}
common_hal_mcu_disable_interrupts();
self->first_edge = true;
pulsein_set_interrupt(self, !self->idle_state, self->idle_state);
common_hal_mcu_enable_interrupts();
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self->paused = false;
}
void common_hal_pulseio_pulsein_clear(pulseio_pulsein_obj_t* self) {
common_hal_mcu_disable_interrupts();
self->start = 0;
self->len = 0;
common_hal_mcu_enable_interrupts();
}
uint16_t common_hal_pulseio_pulsein_popleft(pulseio_pulsein_obj_t* self) {
if (self->len == 0) {
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mp_raise_IndexError(translate("pop from an empty PulseIn"));
}
common_hal_mcu_disable_interrupts();
uint16_t value = self->buffer[self->start];
self->start = (self->start + 1) % self->maxlen;
self->len--;
common_hal_mcu_enable_interrupts();
return value;
}
uint16_t common_hal_pulseio_pulsein_get_maxlen(pulseio_pulsein_obj_t* self) {
return self->maxlen;
}
bool common_hal_pulseio_pulsein_get_paused(pulseio_pulsein_obj_t* self) {
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return self->paused;
}
uint16_t common_hal_pulseio_pulsein_get_len(pulseio_pulsein_obj_t* self) {
return self->len;
}
uint16_t common_hal_pulseio_pulsein_get_item(pulseio_pulsein_obj_t* self,
int16_t index) {
common_hal_mcu_disable_interrupts();
if (index < 0) {
index += self->len;
}
if (index < 0 || index >= self->len) {
common_hal_mcu_enable_interrupts();
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mp_raise_IndexError(translate("index out of range"));
}
uint16_t value = self->buffer[(self->start + index) % self->maxlen];
common_hal_mcu_enable_interrupts();
return value;
}