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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
* Copyright (c) 2019 Lucian Copeland 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 "shared-bindings/microcontroller/Pin.h"
#include "py/mphal.h"
#include "esp-idf/components/driver/include/driver/gpio.h"
#include "esp-idf/components/soc/include/hal/gpio_hal.h"
STATIC uint32_t never_reset_pins[2];
STATIC uint32_t in_use[2];
void never_reset_pin_number(gpio_num_t pin_number) {
never_reset_pins[pin_number / 32] |= 1 << pin_number % 32;
}
void never_reset_pin(const mcu_pin_obj_t* pin) {
never_reset_pin_number(pin->number);
}
// Mark pin as free and return it to a quiescent state.
void reset_pin_number(gpio_num_t pin_number) {
never_reset_pins[pin_number / 32] &= ~(1 << pin_number % 32);
in_use[pin_number / 32] &= ~(1 << pin_number % 32);
}
void reset_all_pins(void) {
for (uint8_t i = 0; i < GPIO_PIN_COUNT; i++) {
uint32_t iomux_address = GPIO_PIN_MUX_REG[i];
if (iomux_address == 0 ||
(never_reset_pins[i / 32] & (1 << i % 32)) != 0) {
continue;
}
gpio_set_direction(i, GPIO_MODE_DEF_INPUT);
gpio_pullup_dis(i);
gpio_pulldown_dis(i);
}
in_use[0] = 0;
in_use[1] = 0;
}
void claim_pin(const mcu_pin_obj_t* pin) {
in_use[pin->number / 32] |= (1 << pin->number % 32);
}
bool pin_number_is_free(gpio_num_t pin_number) {
uint8_t offset = pin_number / 32;
uint8_t mask = 1 << pin_number % 32;
return (never_reset_pins[offset] & mask) == 0 && (in_use[offset] & mask) == 0;
}
bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin) {
return pin_number_is_free(pin->number);
}
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