67 lines
2.2 KiB
C
67 lines
2.2 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) 2016 Scott Shawcroft for Adafruit Industries
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* Copyright (c) 2019 Lucian Copeland 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 "shared-bindings/microcontroller/Pin.h"
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#include "py/mphal.h"
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STATIC uint8_t claimed_pins[1];
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// Mark pin as free and return it to a quiescent state.
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void reset_pin_number(uint8_t pin_port, uint8_t pin_number) {
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if (pin_port == 0x0F) {
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return;
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}
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// Clear claimed bit.
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claimed_pins[pin_port] &= ~(1 << pin_number);
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}
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void common_hal_reset_pin(const mcu_pin_obj_t *pin) {
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if (pin == NULL) {
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return;
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}
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reset_pin_number(0, pin->number);
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}
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void claim_pin(const mcu_pin_obj_t *pin) {
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// Set bit in claimed_pins bitmask.
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claimed_pins[0] |= 1 << pin->number;
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}
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void common_hal_mcu_pin_claim(const mcu_pin_obj_t *pin) {
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claim_pin(pin);
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}
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bool pin_number_is_free(uint8_t pin_port, uint8_t pin_number) {
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return !(claimed_pins[pin_port] & 1 << pin_number);
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}
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bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin) {
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return pin_number_is_free(0, pin->number);
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}
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