db5f99c63e
The port is free to return NULL for any/all of these, and the caller has to check. This will be used in the floppy code, because aside from getting the registers, it looks like all is independent of MCU.
217 lines
7.5 KiB
C
217 lines
7.5 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) 2017 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 <stdint.h>
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#include <string.h>
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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "hal/include/hal_gpio.h"
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#include "common-hal/microcontroller/Pin.h"
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#include "shared-bindings/digitalio/DigitalInOut.h"
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#include "supervisor/shared/translate.h"
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digitalinout_result_t common_hal_digitalio_digitalinout_construct(
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digitalio_digitalinout_obj_t *self, const mcu_pin_obj_t *pin) {
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claim_pin(pin);
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self->pin = pin;
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self->output = false;
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self->open_drain = false;
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// Must set pull after setting direction.
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gpio_set_pin_direction(pin->number, GPIO_DIRECTION_IN);
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gpio_set_pin_pull_mode(pin->number, GPIO_PULL_OFF);
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return DIGITALINOUT_OK;
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}
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void common_hal_digitalio_digitalinout_never_reset(
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digitalio_digitalinout_obj_t *self) {
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never_reset_pin_number(self->pin->number);
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}
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bool common_hal_digitalio_digitalinout_deinited(digitalio_digitalinout_obj_t *self) {
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return self->pin == NULL;
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}
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void common_hal_digitalio_digitalinout_deinit(digitalio_digitalinout_obj_t *self) {
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if (common_hal_digitalio_digitalinout_deinited(self)) {
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return;
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}
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reset_pin_number(self->pin->number);
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self->pin = NULL;
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}
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void common_hal_digitalio_digitalinout_switch_to_input(
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digitalio_digitalinout_obj_t *self, digitalio_pull_t pull) {
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self->output = false;
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// This also sets direction to input.
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common_hal_digitalio_digitalinout_set_pull(self, pull);
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}
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digitalinout_result_t common_hal_digitalio_digitalinout_switch_to_output(
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digitalio_digitalinout_obj_t *self, bool value,
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digitalio_drive_mode_t drive_mode) {
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const uint8_t pin = self->pin->number;
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gpio_set_pin_pull_mode(pin, GPIO_PULL_OFF);
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// Turn on "strong" pin driving (more current available). See DRVSTR doc in datasheet.
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hri_port_set_PINCFG_DRVSTR_bit(PORT, (enum gpio_port)GPIO_PORT(pin), GPIO_PIN(pin));
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self->output = true;
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self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
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// Direction is set in set_value. We don't need to do it here.
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common_hal_digitalio_digitalinout_set_value(self, value);
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return DIGITALINOUT_OK;
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}
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digitalio_direction_t common_hal_digitalio_digitalinout_get_direction(
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digitalio_digitalinout_obj_t *self) {
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return self->output ? DIRECTION_OUTPUT : DIRECTION_INPUT;
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}
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void common_hal_digitalio_digitalinout_set_value(
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digitalio_digitalinout_obj_t *self, bool value) {
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const uint8_t pin = self->pin->number;
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const uint8_t port = GPIO_PORT(pin);
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const uint32_t pin_mask = 1U << GPIO_PIN(pin);
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if (value) {
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if (self->open_drain) {
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// Assertion: pull is off, so the pin is floating in this case.
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// We do open-drain high output (no sinking of current)
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// by changing the direction to input with no pulls.
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hri_port_clear_DIR_DIR_bf(PORT, port, pin_mask);
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} else {
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hri_port_set_DIR_DIR_bf(PORT, port, pin_mask);
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hri_port_set_OUT_OUT_bf(PORT, port, pin_mask);
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}
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} else {
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hri_port_set_DIR_DIR_bf(PORT, port, pin_mask);
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hri_port_clear_OUT_OUT_bf(PORT,port, pin_mask);
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}
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}
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bool common_hal_digitalio_digitalinout_get_value(
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digitalio_digitalinout_obj_t *self) {
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const uint8_t pin = self->pin->number;
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if (!self->output) {
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return gpio_get_pin_level(pin);
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} else {
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if (self->open_drain && hri_port_get_DIR_reg(PORT, GPIO_PORT(pin), 1U << GPIO_PIN(pin)) == 0) {
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return true;
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} else {
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return hri_port_get_OUT_reg(PORT, GPIO_PORT(pin), 1U << GPIO_PIN(pin));
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}
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}
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}
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digitalinout_result_t common_hal_digitalio_digitalinout_set_drive_mode(
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digitalio_digitalinout_obj_t *self,
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digitalio_drive_mode_t drive_mode) {
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bool value = common_hal_digitalio_digitalinout_get_value(self);
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self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
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// True is implemented differently between modes so reset the value to make
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// sure it's correct for the new mode.
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if (value) {
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common_hal_digitalio_digitalinout_set_value(self, value);
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}
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return DIGITALINOUT_OK;
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}
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digitalio_drive_mode_t common_hal_digitalio_digitalinout_get_drive_mode(
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digitalio_digitalinout_obj_t *self) {
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if (self->open_drain) {
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return DRIVE_MODE_OPEN_DRAIN;
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} else {
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return DRIVE_MODE_PUSH_PULL;
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}
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}
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void common_hal_digitalio_digitalinout_set_pull(
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digitalio_digitalinout_obj_t *self, digitalio_pull_t pull) {
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enum gpio_pull_mode asf_pull = GPIO_PULL_OFF;
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switch (pull) {
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case PULL_UP:
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asf_pull = GPIO_PULL_UP;
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break;
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case PULL_DOWN:
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asf_pull = GPIO_PULL_DOWN;
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break;
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case PULL_NONE:
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default:
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break;
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}
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// Must set pull after setting direction.
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gpio_set_pin_direction(self->pin->number, GPIO_DIRECTION_IN);
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gpio_set_pin_pull_mode(self->pin->number, asf_pull);
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}
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digitalio_pull_t common_hal_digitalio_digitalinout_get_pull(
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digitalio_digitalinout_obj_t *self) {
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uint32_t pin = self->pin->number;
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if (self->output) {
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mp_raise_AttributeError(translate("Cannot get pull while in output mode"));
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return PULL_NONE;
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} else {
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if (hri_port_get_PINCFG_PULLEN_bit(PORT, GPIO_PORT(pin), GPIO_PIN(pin)) == 0) {
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return PULL_NONE;
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}
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if (hri_port_get_OUT_reg(PORT, GPIO_PORT(pin), 1U << GPIO_PIN(pin)) > 0) {
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return PULL_UP;
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} else {
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return PULL_DOWN;
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}
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}
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}
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bool common_hal_digitalio_has_reg_op(digitalinout_reg_op_t op) {
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return true;
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}
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volatile uint32_t *common_hal_digitalio_digitalinout_get_reg(digitalio_digitalinout_obj_t *self, digitalinout_reg_op_t op, uint32_t *mask) {
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const uint8_t pin = self->pin->number;
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int port = GPIO_PORT(pin);
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*mask = 1u << GPIO_PIN(pin);
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switch (op) {
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case DIGITALINOUT_REG_READ:
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return (volatile uint32_t *)&PORT->Group[port].IN.reg;
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case DIGITALINOUT_REG_WRITE:
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return &PORT->Group[port].OUT.reg;
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case DIGITALINOUT_REG_SET:
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return &PORT->Group[port].OUTSET.reg;
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case DIGITALINOUT_REG_RESET:
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return &PORT->Group[port].OUTCLR.reg;
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case DIGITALINOUT_REG_TOGGLE:
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return &PORT->Group[port].OUTTGL.reg;
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default:
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return NULL;
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}
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}
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