112 lines
3.4 KiB
C
112 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) 2021 Scott Shawcroft 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 "peripherals/broadcom/gpio.h"
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STATIC bool pin_in_use[BCM_PIN_COUNT];
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STATIC bool never_reset_pin[BCM_PIN_COUNT];
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void reset_all_pins(void) {
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for (size_t i = 0; i < BCM_PIN_COUNT; i++) {
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if (never_reset_pin[i]) {
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continue;
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}
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reset_pin_number(i);
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}
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}
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void never_reset_pin_number(uint8_t pin_number) {
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never_reset_pin[pin_number] = true;
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}
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void reset_pin_number(uint8_t pin_number) {
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pin_in_use[pin_number] = false;
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never_reset_pin[pin_number] = false;
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// Reset JTAG pins back to JTAG.
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BP_PULL_Enum pull = BP_PULL_NONE;
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if (22 <= pin_number && pin_number <= 27) {
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gpio_set_function(pin_number, GPIO_FUNCTION_ALT4);
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pull = BP_PULL_DOWN;
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return;
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} else {
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gpio_set_function(pin_number, GPIO_FUNCTION_INPUT);
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}
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// Set the pull to match the datasheet.
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if (pin_number < 9 ||
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(33 < pin_number && pin_number < 37) ||
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pin_number > 45) {
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pull = BP_PULL_UP;
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} else if (pin_number != 28 &&
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pin_number != 29 &&
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pin_number != 44 &&
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pin_number != 45) {
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// Most pins are pulled low so we only exclude the four pins that aren't
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// pulled at all.
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pull = BP_PULL_DOWN;
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}
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gpio_set_pull(pin_number, pull);
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}
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void common_hal_never_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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never_reset_pin_number(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(pin->number);
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}
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void claim_pin(const mcu_pin_obj_t *pin) {
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pin_in_use[pin->number] = true;
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}
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bool pin_number_is_free(uint8_t pin_number) {
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return !pin_in_use[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(pin->number);
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}
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uint8_t common_hal_mcu_pin_number(const mcu_pin_obj_t *pin) {
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return 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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return claim_pin(pin);
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}
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void common_hal_mcu_pin_reset_number(uint8_t pin_no) {
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reset_pin_number(pin_no);
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}
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