228 lines
8.8 KiB
C
228 lines
8.8 KiB
C
/*
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* This file is part of the Micro Python 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) 2013, 2014 Damien P. George
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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 <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "shared-bindings/digitalio/DigitalInOut.h"
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#include "common-hal/microcontroller/Pin.h"
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extern volatile bool gpio16_in_use;
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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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self->pin = pin;
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if (self->pin->gpio_number == 16) {
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WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1); // mux configuration for XPD_DCDC and rtc_gpio0 connection
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WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1); //mux configuration for out enable
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WRITE_PERI_REG(RTC_GPIO_ENABLE, READ_PERI_REG(RTC_GPIO_ENABLE) & ~1); //out disable
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claim_pin(pin);
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} else {
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PIN_FUNC_SELECT(self->pin->peripheral, self->pin->gpio_function);
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}
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return DIGITALINOUT_OK;
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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 == mp_const_none;
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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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if (self->pin->gpio_number < 16) {
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uint32_t pin_mask = 1 << self->pin->gpio_number;
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gpio_output_set(0x0, 0x0, 0x0, pin_mask);
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PIN_FUNC_SELECT(self->pin->peripheral, 0);
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PIN_PULLUP_DIS(self->pin->peripheral);
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} else {
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reset_pin(self->pin);
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}
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self->pin = mp_const_none;
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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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if (self->pin->gpio_number == 16) {
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WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1);
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WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1);
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WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1)); // input
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} else {
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PIN_PULLUP_DIS(self->pin->peripheral);
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gpio_output_set(0, 0, 0, 1 << self->pin->gpio_number);
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}
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common_hal_digitalio_digitalinout_set_pull(self, pull);
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}
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void 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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self->output = true;
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self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
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if (self->pin->gpio_number == 16) {
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WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1);
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WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1);
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WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1) | 1); // output
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} else if (!self->open_drain) {
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gpio_output_set(0, 0, 1 << self->pin->gpio_number, 0);
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PIN_PULLUP_DIS(self->pin->peripheral);
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}
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common_hal_digitalio_digitalinout_set_value(self, value);
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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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if (self->pin->gpio_number == 16) {
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if (self->open_drain && value) {
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// configure GPIO16 as input with output register holding 0
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WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1);
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WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1);
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WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1)); // input
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WRITE_PERI_REG(RTC_GPIO_OUT, (READ_PERI_REG(RTC_GPIO_OUT) & 1)); // out=1
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return;
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} else {
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int out_en = self->output;
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WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1);
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WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1);
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WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1) | out_en);
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WRITE_PERI_REG(RTC_GPIO_OUT, (READ_PERI_REG(RTC_GPIO_OUT) & ~1) | value);
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return;
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}
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}
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if (value) {
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if (self->open_drain) {
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// Disable output.
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gpio_output_set(0, 0, 0, 1 << self->pin->gpio_number);
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} else {
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// Set high
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gpio_output_set(1 << self->pin->gpio_number, 0, 0, 0);
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}
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} else {
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if (self->open_drain) {
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// Enable the output
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gpio_output_set(0, 0, 1 << self->pin->gpio_number, 0);
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}
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// Set low
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gpio_output_set(0, 1 << self->pin->gpio_number, 0, 0);
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}
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}
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// Register addresses taken from: https://github.com/esp8266/esp8266-wiki/wiki/gpio-registers
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volatile uint32_t* PIN_DIR = (uint32_t *) 0x6000030C;
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volatile uint32_t* PIN_OUT = (uint32_t *) 0x60000300;
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bool common_hal_digitalio_digitalinout_get_value(
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digitalio_digitalinout_obj_t* self) {
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if (!self->output) {
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if (self->pin->gpio_number == 16) {
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return READ_PERI_REG(RTC_GPIO_IN_DATA) & 1;
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}
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return GPIO_INPUT_GET(self->pin->gpio_number);
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} else {
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if (self->pin->gpio_number == 16) {
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if (self->open_drain && READ_PERI_REG(RTC_GPIO_ENABLE) == 0) {
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return true;
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} else {
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return READ_PERI_REG(RTC_GPIO_OUT) & 1;
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}
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} else {
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uint32_t pin_mask = 1 << self->pin->gpio_number;
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if (self->open_drain && ((*PIN_DIR) & pin_mask) == 0) {
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return true;
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} else {
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return ((*PIN_OUT) & pin_mask) != 0;
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}
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}
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}
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}
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void 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 its 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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}
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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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if (pull == PULL_DOWN) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError,
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"ESP8266 does not support pull down."));
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return;
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}
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if (self->pin->gpio_number == 16) {
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// PULL_DOWN is the only hardware pull direction available on GPIO16.
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// since we don't support pull down, just return without attempting
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// to set pull (which won't work anyway). If PULL_UP is requested,
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// raise the exception so the user knows PULL_UP is not available
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if (pull != PULL_NONE){
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError,
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"GPIO16 does not support pull up."));
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}
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return;
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}
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if (pull == PULL_NONE) {
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PIN_PULLUP_DIS(self->pin->peripheral);
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} else {
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PIN_PULLUP_EN(self->pin->peripheral);
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}
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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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if (self->pin->gpio_number < 16 &&
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(READ_PERI_REG(self->pin->peripheral) & PERIPHS_IO_MUX_PULLUP) != 0) {
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return PULL_UP;
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}
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return PULL_NONE;
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}
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