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

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 Scott Shawcroft 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 <stdint.h>
#include <string.h>
#include "py/runtime.h"
#include "py/mphal.h"
#include "common-hal/microcontroller/Pin.h"
#include "shared-bindings/digitalio/DigitalInOut.h"
#include "supervisor/shared/translate.h"
#include "src/rp2_common/hardware_gpio/include/hardware/gpio.h"
digitalinout_result_t common_hal_digitalio_digitalinout_construct(
digitalio_digitalinout_obj_t* self, const mcu_pin_obj_t* pin) {
claim_pin(pin);
self->pin = pin;
self->output = false;
self->open_drain = false;
// Set to input. No output value.
gpio_init(pin->number);
return DIGITALINOUT_OK;
}
void common_hal_digitalio_digitalinout_never_reset(
digitalio_digitalinout_obj_t *self) {
never_reset_pin_number(self->pin->number);
}
bool common_hal_digitalio_digitalinout_deinited(digitalio_digitalinout_obj_t* self) {
return self->pin == NULL;
}
void common_hal_digitalio_digitalinout_deinit(digitalio_digitalinout_obj_t* self) {
if (common_hal_digitalio_digitalinout_deinited(self)) {
return;
}
reset_pin_number(self->pin->number);
self->pin = NULL;
}
void common_hal_digitalio_digitalinout_switch_to_input(
digitalio_digitalinout_obj_t* self, digitalio_pull_t pull) {
self->output = false;
// This also sets direction to input.
common_hal_digitalio_digitalinout_set_pull(self, pull);
}
digitalinout_result_t common_hal_digitalio_digitalinout_switch_to_output(
digitalio_digitalinout_obj_t* self, bool value,
digitalio_drive_mode_t drive_mode) {
const uint8_t pin = self->pin->number;
gpio_disable_pulls(pin);
// Turn on "strong" pin driving (more current available).
hw_write_masked(&padsbank0_hw->io[pin],
PADS_BANK0_GPIO0_DRIVE_VALUE_12MA << PADS_BANK0_GPIO0_DRIVE_LSB,
PADS_BANK0_GPIO0_DRIVE_BITS);
self->output = true;
self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
// Pin direction is ultimately set in set_value. We don't need to do it here.
common_hal_digitalio_digitalinout_set_value(self, value);
return DIGITALINOUT_OK;
}
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) {
const uint8_t pin = self->pin->number;
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if (self->open_drain && value) {
// If true and open-drain, set the direction -before- setting
// the pin value, to to avoid a high glitch on the pin before
// switching from output to input for open-drain.
gpio_set_dir(pin, GPIO_IN);
gpio_put(pin, value);
} else {
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// Otherwise set the direction -after- setting the pin value,
// to avoid a glitch which might occur if the old value was
// different and the pin was previously set to input.
gpio_put(pin, value);
gpio_set_dir(pin, GPIO_OUT);
}
}
bool common_hal_digitalio_digitalinout_get_value(
digitalio_digitalinout_obj_t* self) {
return gpio_get(self->pin->number);
}
digitalinout_result_t common_hal_digitalio_digitalinout_set_drive_mode(
digitalio_digitalinout_obj_t* self,
digitalio_drive_mode_t drive_mode) {
const uint8_t pin = self->pin->number;
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 it's correct for the new mode.
if (value) {
common_hal_digitalio_digitalinout_set_value(self, value);
}
return DIGITALINOUT_OK;
}
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) {
const uint8_t pin = self->pin->number;
gpio_set_pulls(pin, pull == PULL_UP, pull == PULL_DOWN);
gpio_set_dir(pin, GPIO_IN);
}
digitalio_pull_t common_hal_digitalio_digitalinout_get_pull(
digitalio_digitalinout_obj_t* self) {
uint32_t pin = self->pin->number;
if (self->output) {
mp_raise_AttributeError(translate("Cannot get pull while in output mode"));
return PULL_NONE;
} else {
if (gpio_is_pulled_up(pin)) {
return PULL_UP;
} else if (gpio_is_pulled_down(pin)) {
return PULL_DOWN;
}
}
return PULL_NONE;
}