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circuitpython/ports/esp8266/common-hal/digitalio/DigitalInOut.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* 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 <stdio.h>
#include <stdint.h>
#include <string.h>
#include "py/nlr.h"
#include "py/runtime.h"
#include "py/mphal.h"
#include "shared-bindings/digitalio/DigitalInOut.h"
#include "common-hal/microcontroller/Pin.h"
extern volatile bool gpio16_in_use;
digitalinout_result_t common_hal_digitalio_digitalinout_construct(
digitalio_digitalinout_obj_t* self, const mcu_pin_obj_t* pin) {
self->pin = pin;
if (self->pin->gpio_number == 16) {
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
WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1); //mux configuration for out enable
WRITE_PERI_REG(RTC_GPIO_ENABLE, READ_PERI_REG(RTC_GPIO_ENABLE) & ~1); //out disable
claim_pin(pin);
} else {
PIN_FUNC_SELECT(self->pin->peripheral, self->pin->gpio_function);
}
return DIGITALINOUT_OK;
}
bool common_hal_digitalio_digitalinout_deinited(digitalio_digitalinout_obj_t* self) {
return self->pin == mp_const_none;
}
void common_hal_digitalio_digitalinout_deinit(digitalio_digitalinout_obj_t* self) {
if (common_hal_digitalio_digitalinout_deinited(self)) {
return;
}
if (self->pin->gpio_number < 16) {
uint32_t pin_mask = 1 << self->pin->gpio_number;
gpio_output_set(0x0, 0x0, 0x0, pin_mask);
PIN_FUNC_SELECT(self->pin->peripheral, 0);
PIN_PULLUP_DIS(self->pin->peripheral);
} else {
reset_pin(self->pin);
}
self->pin = mp_const_none;
}
void common_hal_digitalio_digitalinout_switch_to_input(
digitalio_digitalinout_obj_t* self, digitalio_pull_t pull) {
self->output = false;
if (self->pin->gpio_number == 16) {
WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1);
WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1);
WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1)); // input
} else {
PIN_PULLUP_DIS(self->pin->peripheral);
gpio_output_set(0, 0, 0, 1 << self->pin->gpio_number);
}
common_hal_digitalio_digitalinout_set_pull(self, pull);
}
void common_hal_digitalio_digitalinout_switch_to_output(
digitalio_digitalinout_obj_t* self, bool value,
digitalio_drive_mode_t drive_mode) {
self->output = true;
self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
if (self->pin->gpio_number == 16) {
WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1);
WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1);
WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1) | 1); // output
} else if (!self->open_drain) {
gpio_output_set(0, 0, 1 << self->pin->gpio_number, 0);
PIN_PULLUP_DIS(self->pin->peripheral);
}
common_hal_digitalio_digitalinout_set_value(self, value);
}
digitalio_direction_t common_hal_digitalio_digitalinout_get_direction(
digitalio_digitalinout_obj_t* self) {
return self->output? DIRECTION_OUTPUT : DIRECTION_INPUT;
}
void common_hal_digitalio_digitalinout_set_value(
digitalio_digitalinout_obj_t* self, bool value) {
if (self->pin->gpio_number == 16) {
if (self->open_drain && value) {
// configure GPIO16 as input with output register holding 0
WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1);
WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1);
WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1)); // input
WRITE_PERI_REG(RTC_GPIO_OUT, (READ_PERI_REG(RTC_GPIO_OUT) & 1)); // out=1
return;
} else {
int out_en = self->output;
WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1);
WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1);
WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1) | out_en);
WRITE_PERI_REG(RTC_GPIO_OUT, (READ_PERI_REG(RTC_GPIO_OUT) & ~1) | value);
return;
}
}
if (value) {
if (self->open_drain) {
// Disable output.
gpio_output_set(0, 0, 0, 1 << self->pin->gpio_number);
} else {
// Set high
gpio_output_set(1 << self->pin->gpio_number, 0, 0, 0);
}
} else {
if (self->open_drain) {
// Enable the output
gpio_output_set(0, 0, 1 << self->pin->gpio_number, 0);
}
// Set low
gpio_output_set(0, 1 << self->pin->gpio_number, 0, 0);
}
}
// Register addresses taken from: https://github.com/esp8266/esp8266-wiki/wiki/gpio-registers
volatile uint32_t* PIN_DIR = (uint32_t *) 0x6000030C;
volatile uint32_t* PIN_OUT = (uint32_t *) 0x60000300;
bool common_hal_digitalio_digitalinout_get_value(
digitalio_digitalinout_obj_t* self) {
if (!self->output) {
if (self->pin->gpio_number == 16) {
return READ_PERI_REG(RTC_GPIO_IN_DATA) & 1;
}
return GPIO_INPUT_GET(self->pin->gpio_number);
} else {
if (self->pin->gpio_number == 16) {
if (self->open_drain && READ_PERI_REG(RTC_GPIO_ENABLE) == 0) {
return true;
} else {
return READ_PERI_REG(RTC_GPIO_OUT) & 1;
}
} else {
uint32_t pin_mask = 1 << self->pin->gpio_number;
if (self->open_drain && ((*PIN_DIR) & pin_mask) == 0) {
return true;
} else {
return ((*PIN_OUT) & pin_mask) != 0;
}
}
}
}
void common_hal_digitalio_digitalinout_set_drive_mode(
digitalio_digitalinout_obj_t* self,
digitalio_drive_mode_t drive_mode) {
bool value = common_hal_digitalio_digitalinout_get_value(self);
self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
// True is implemented differently between modes so reset the value to make
// sure its correct for the new mode.
if (value) {
common_hal_digitalio_digitalinout_set_value(self, value);
}
}
digitalio_drive_mode_t common_hal_digitalio_digitalinout_get_drive_mode(
digitalio_digitalinout_obj_t* self) {
if (self->open_drain) {
return DRIVE_MODE_OPEN_DRAIN;
} else {
return DRIVE_MODE_PUSH_PULL;
}
}
void common_hal_digitalio_digitalinout_set_pull(
digitalio_digitalinout_obj_t* self, digitalio_pull_t pull) {
if (pull == PULL_DOWN) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError,
"ESP8266 does not support pull down."));
return;
}
if (self->pin->gpio_number == 16) {
// PULL_DOWN is the only hardware pull direction available on GPIO16.
// since we don't support pull down, just return without attempting
// to set pull (which won't work anyway). If PULL_UP is requested,
// raise the exception so the user knows PULL_UP is not available
if (pull != PULL_NONE){
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError,
"GPIO16 does not support pull up."));
}
return;
}
if (pull == PULL_NONE) {
PIN_PULLUP_DIS(self->pin->peripheral);
} else {
PIN_PULLUP_EN(self->pin->peripheral);
}
}
digitalio_pull_t common_hal_digitalio_digitalinout_get_pull(
digitalio_digitalinout_obj_t* self) {
if (self->pin->gpio_number < 16 &&
(READ_PERI_REG(self->pin->peripheral) & PERIPHS_IO_MUX_PULLUP) != 0) {
return PULL_UP;
}
return PULL_NONE;
}
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