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/*
* This file is part of the MicroPython 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 <stdint.h>
#include <string.h>
#include "py/nlr.h"
#include "py/runtime.h"
#include "py/mphal.h"
#include "common-hal/microcontroller/Pin.h"
#include "shared-bindings/digitalio/DigitalInOut.h"
#include "asf/sam0/drivers/port/port.h"
#include "asf/sam0/drivers/system/pinmux/pinmux.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;
struct port_config pin_conf;
port_get_config_defaults(&pin_conf);
pin_conf.direction = PORT_PIN_DIR_INPUT;
pin_conf.input_pull = PORT_PIN_PULL_NONE;
port_pin_set_config(self->pin->pin, &pin_conf);
return DIGITALINOUT_OK;
}
void common_hal_digitalio_digitalinout_deinit(digitalio_digitalinout_obj_t* self) {
reset_pin(self->pin->pin);
}
void common_hal_digitalio_digitalinout_switch_to_input(
digitalio_digitalinout_obj_t* self, enum digitalio_pull_t pull) {
self->output = false;
common_hal_digitalio_digitalinout_set_pull(self, pull);
}
void common_hal_digitalio_digitalinout_switch_to_output(
digitalio_digitalinout_obj_t* self, bool value,
enum digitalio_drive_mode_t drive_mode) {
struct port_config pin_conf;
port_get_config_defaults(&pin_conf);
pin_conf.direction = PORT_PIN_DIR_INPUT;
pin_conf.input_pull = PORT_PIN_PULL_NONE;
port_pin_set_config(self->pin->pin, &pin_conf);
self->output = true;
self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
common_hal_digitalio_digitalinout_set_value(self, value);
}
enum 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) {
uint32_t pin = self->pin->pin;
PortGroup *const port_base = port_get_group_from_gpio_pin(pin);
uint32_t pin_mask = (1UL << (pin % 32));
/* Set the pin to high or low atomically based on the requested level */
if (value) {
if (self->open_drain) {
port_base->DIRCLR.reg = pin_mask;
} else {
port_base->DIRSET.reg = pin_mask;
port_base->OUTSET.reg = pin_mask;
}
} else {
port_base->DIRSET.reg = pin_mask;
port_base->OUTCLR.reg = pin_mask;
}
}
bool common_hal_digitalio_digitalinout_get_value(
digitalio_digitalinout_obj_t* self) {
uint32_t pin = self->pin->pin;
PortGroup *const port_base = port_get_group_from_gpio_pin(pin);
uint32_t pin_mask = (1UL << (pin % 32));
if (!self->output) {
return (port_base->IN.reg & pin_mask);
} else {
if (self->open_drain && (port_base->DIR.reg & pin_mask) == 0) {
return true;
} else {
return (port_base->OUT.reg & pin_mask);
}
}
}
void common_hal_digitalio_digitalinout_set_drive_mode(
digitalio_digitalinout_obj_t* self,
enum 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);
}
}
enum 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, enum digitalio_pull_t pull) {
enum port_pin_pull asf_pull = PORT_PIN_PULL_NONE;
switch (pull) {
case PULL_UP:
asf_pull = PORT_PIN_PULL_UP;
break;
case PULL_DOWN:
asf_pull = PORT_PIN_PULL_DOWN;
break;
case PULL_NONE:
default:
break;
}
struct port_config pin_conf;
port_get_config_defaults(&pin_conf);
pin_conf.direction = PORT_PIN_DIR_INPUT;
pin_conf.input_pull = asf_pull;
port_pin_set_config(self->pin->pin, &pin_conf);
}
enum digitalio_pull_t common_hal_digitalio_digitalinout_get_pull(
digitalio_digitalinout_obj_t* self) {
uint32_t pin = self->pin->pin;
PortGroup *const port_base = port_get_group_from_gpio_pin(pin);
uint32_t pin_mask = (1UL << (pin % 32));
if (self->output) {
mp_raise_AttributeError("Cannot get pull while in output mode");
return PULL_NONE;
} else {
if (port_base->PINCFG[pin % 32].bit.PULLEN == 0) {
return PULL_NONE;
} if ((port_base->OUT.reg & pin_mask) > 0) {
return PULL_UP;
} else {
return PULL_DOWN;
}
}
}
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