88 lines
3.4 KiB
C
88 lines
3.4 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) 2019 Nick Moore for Adafruit Industries
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* Copyright (c) 2023 Jeff Epler 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 "common-hal/digitalio/DigitalInOut.h"
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#include "common-hal/rotaryio/IncrementalEncoder.h"
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#include "shared-module/rotaryio/IncrementalEncoder.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "shared-bindings/rotaryio/IncrementalEncoder.h"
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#include "py/runtime.h"
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#include "sdk/drivers/igpio/fsl_gpio.h"
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static void encoder_change(void *self_in) {
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rotaryio_incrementalencoder_obj_t *self = self_in;
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bool value_a = GPIO_PinRead(self->pin_a->gpio, self->pin_a->number);
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bool value_b = GPIO_PinRead(self->pin_b->gpio, self->pin_b->number);
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uint8_t new_state = (value_a << 1) | value_b;
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shared_module_softencoder_state_update(self, new_state);
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}
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void common_hal_rotaryio_incrementalencoder_construct(rotaryio_incrementalencoder_obj_t *self,
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const mcu_pin_obj_t *pin_a, const mcu_pin_obj_t *pin_b) {
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self->pin_a = pin_a;
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self->pin_b = pin_b;
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// GPIO is always IOMUXC_SW_MUX_CTL_PAD_MUX_MODE_ALT5 until proven otherwise
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#define IOMUXC_SW_MUX_CTL_PAD_MUX_MODE_ALT5 5U
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IOMUXC_SetPinMux(pin_a->mux_reg, IOMUXC_SW_MUX_CTL_PAD_MUX_MODE_ALT5, 0, 0, 0, 0);
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IOMUXC_SetPinMux(pin_b->mux_reg, IOMUXC_SW_MUX_CTL_PAD_MUX_MODE_ALT5, 0, 0, 0, 0);
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const gpio_pin_config_t config = { kGPIO_DigitalInput, 0, kGPIO_IntRisingOrFallingEdge };
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GPIO_PinInit(pin_a->gpio, pin_a->number, &config);
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GPIO_PinInit(pin_b->gpio, pin_b->number, &config);
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enable_pin_change_interrupt(pin_a, encoder_change, self);
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enable_pin_change_interrupt(pin_b, encoder_change, self);
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pin_config(pin_a, false, PULL_UP);
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pin_config(pin_b, false, PULL_UP);
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claim_pin(pin_a);
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claim_pin(pin_b);
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}
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bool common_hal_rotaryio_incrementalencoder_deinited(rotaryio_incrementalencoder_obj_t *self) {
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return !self->pin_a;
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}
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void common_hal_rotaryio_incrementalencoder_deinit(rotaryio_incrementalencoder_obj_t *self) {
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if (common_hal_rotaryio_incrementalencoder_deinited(self)) {
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return;
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}
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disable_pin_change_interrupt(self->pin_a);
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disable_pin_change_interrupt(self->pin_b);
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common_hal_reset_pin(self->pin_a);
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common_hal_reset_pin(self->pin_b);
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self->pin_a = NULL;
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self->pin_b = NULL;
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}
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