234 lines
8.4 KiB
C
234 lines
8.4 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2021 Dave Putz for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "src/rp2_common/hardware_gpio/include/hardware/gpio.h"
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#include <stdint.h>
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#include "py/runtime.h"
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#include "shared-bindings/microcontroller/__init__.h"
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#include "shared-bindings/pulseio/PulseIn.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "supervisor/shared/translate.h"
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#include "bindings/rp2pio/StateMachine.h"
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#include "common-hal/pulseio/PulseIn.h"
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#define NO_PIN 0xff
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#define MAX_PULSE 65535
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#define MIN_PULSE 10
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volatile bool last_level;
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volatile uint32_t level_count = 0;
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volatile uint32_t result = 0;
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volatile uint16_t buf_index = 0;
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uint16_t pulsein_program[] = {
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0x4001, // 1: in pins, 1
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};
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void common_hal_pulseio_pulsein_construct(pulseio_pulsein_obj_t *self,
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const mcu_pin_obj_t *pin, uint16_t maxlen, bool idle_state) {
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self->buffer = (uint16_t *)m_malloc(maxlen * sizeof(uint16_t), false);
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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));
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}
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self->pin = pin->number;
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self->maxlen = maxlen;
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self->idle_state = idle_state;
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self->start = 0;
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self->len = 0;
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bool ok = rp2pio_statemachine_construct(&self->state_machine,
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pulsein_program, sizeof(pulsein_program) / sizeof(pulsein_program[0]),
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1000000,
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NULL, 0,
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NULL, 0,
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pin, 1,
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0,0,
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NULL, 0,
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NULL, 0,
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1, 0,
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1 << self->pin, false, true,
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false, 8, false, // TX, unused
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false,
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true, 32, true, // RX auto-push every 32 bits
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false); // claim pins
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pio_sm_set_enabled(self->state_machine.pio,self->state_machine.state_machine, false);
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pio_sm_clear_fifos(self->state_machine.pio,self->state_machine.state_machine);
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last_level = self->idle_state;
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level_count = 0;
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result = 0;
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buf_index = 0;
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pio_sm_set_in_pins(self->state_machine.pio,self->state_machine.state_machine,pin->number);
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common_hal_rp2pio_statemachine_set_interrupt_handler(&(self->state_machine),&common_hal_pulseio_pulsein_interrupt,self,PIO_IRQ0_INTE_SM0_RXNEMPTY_BITS);
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// exec a set pindirs to 0 for input
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pio_sm_exec(self->state_machine.pio,self->state_machine.state_machine,0xe080);
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// exec the appropriate wait for pin
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if (self->idle_state == true) {
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pio_sm_exec(self->state_machine.pio,self->state_machine.state_machine,0x2020);
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} else {
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pio_sm_exec(self->state_machine.pio,self->state_machine.state_machine,0x20a0);
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}
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pio_sm_set_enabled(self->state_machine.pio, self->state_machine.state_machine, true);
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}
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bool common_hal_pulseio_pulsein_deinited(pulseio_pulsein_obj_t *self) {
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return self->pin == NO_PIN;
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}
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void common_hal_pulseio_pulsein_deinit(pulseio_pulsein_obj_t *self) {
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if (common_hal_pulseio_pulsein_deinited(self)) {
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return;
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}
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pio_sm_set_enabled(self->state_machine.pio, self->state_machine.state_machine, false);
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common_hal_rp2pio_statemachine_deinit(&self->state_machine);
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m_free(self->buffer);
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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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void common_hal_pulseio_pulsein_pause(pulseio_pulsein_obj_t *self) {
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pio_sm_restart(self->state_machine.pio, self->state_machine.state_machine);
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pio_sm_set_enabled(self->state_machine.pio, self->state_machine.state_machine, false);
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last_level = self->idle_state;
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level_count = 0;
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result = 0;
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buf_index = 0;
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}
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void common_hal_pulseio_pulsein_interrupt(pulseio_pulsein_obj_t *self) {
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uint32_t rxfifo = 0;
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rxfifo = pio_sm_get_blocking(self->state_machine.pio, self->state_machine.state_machine);
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// translate from fifo to buffer
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for (uint i = 0; i < 32; i++) {
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bool level = (rxfifo & (1 << i)) >> i;
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if (level == last_level) {
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level_count++;
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} else {
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result = level_count;
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last_level = level;
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level_count = 0;
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// Pulses that are longer than MAX_PULSE will return MAX_PULSE
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if (result > MAX_PULSE) {
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result = MAX_PULSE;
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}
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// return pulses that are not too short
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if (result > MIN_PULSE) {
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self->buffer[buf_index] = (uint16_t)result;
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if (self->len < self->maxlen) {
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self->len++;
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}
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if (buf_index < self->maxlen) {
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buf_index++;
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} else {
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self->start = 0;
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buf_index = 0;
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}
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}
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}
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}
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// check for a pulse thats too long (MAX_PULSE us) or maxlen reached, and reset
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if ((level_count > MAX_PULSE) || (buf_index >= self->maxlen)) {
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pio_sm_set_enabled(self->state_machine.pio, self->state_machine.state_machine, false);
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pio_sm_init(self->state_machine.pio, self->state_machine.state_machine, self->state_machine.offset, &self->state_machine.sm_config);
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pio_sm_restart(self->state_machine.pio,self->state_machine.state_machine);
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pio_sm_set_enabled(self->state_machine.pio, self->state_machine.state_machine, true);
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}
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}
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void common_hal_pulseio_pulsein_resume(pulseio_pulsein_obj_t *self,
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uint16_t trigger_duration) {
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// Send the trigger pulse.
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if (trigger_duration > 0) {
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gpio_set_function(self->pin,GPIO_FUNC_SIO);
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gpio_set_dir(self->pin,true);
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gpio_put(self->pin, !self->idle_state);
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common_hal_mcu_delay_us((uint32_t)trigger_duration);
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gpio_set_function(self->pin,GPIO_FUNC_PIO0);
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common_hal_mcu_delay_us(125);
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}
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// Reconfigure the pin for PIO
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gpio_set_function(self->pin, GPIO_FUNC_PIO0);
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// exec a wait for the selected pin to change state
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if (self->idle_state == true) {
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pio_sm_exec(self->state_machine.pio,self->state_machine.state_machine,0x2020);
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} else {
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pio_sm_exec(self->state_machine.pio,self->state_machine.state_machine,0x20a0);
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}
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pio_sm_set_enabled(self->state_machine.pio, self->state_machine.state_machine, true);
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}
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void common_hal_pulseio_pulsein_clear(pulseio_pulsein_obj_t *self) {
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self->start = 0;
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self->len = 0;
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buf_index = 0;
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}
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uint16_t common_hal_pulseio_pulsein_popleft(pulseio_pulsein_obj_t *self) {
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if (self->len == 0) {
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mp_raise_IndexError_varg(translate("pop from empty %q"), MP_QSTR_PulseIn);
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}
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uint16_t value = self->buffer[self->start];
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self->start = (self->start + 1) % self->maxlen;
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self->len--;
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// if we are empty reset buffer pointer and counters
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if (self->len == 0) {
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self->start = 0;
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buf_index = 0;
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level_count = 0;
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}
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return value;
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}
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uint16_t common_hal_pulseio_pulsein_get_maxlen(pulseio_pulsein_obj_t *self) {
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return self->maxlen;
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}
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uint16_t common_hal_pulseio_pulsein_get_len(pulseio_pulsein_obj_t *self) {
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return self->len;
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}
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bool common_hal_pulseio_pulsein_get_paused(pulseio_pulsein_obj_t *self) {
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return true;
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}
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uint16_t common_hal_pulseio_pulsein_get_item(pulseio_pulsein_obj_t *self,
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int16_t index) {
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if (index < 0) {
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index += self->len;
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}
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if (index < 0 || index >= self->len) {
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mp_raise_IndexError_varg(translate("%q index out of range"), MP_QSTR_PulseIn);
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}
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uint16_t value = self->buffer[(self->start + index) % self->maxlen];
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return value;
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}
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