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/** @addtogroup gpio_file GPIO peripheral API
* @ingroup peripheral_apis
*/
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2019 Icenowy Zheng <icenowy@aosc.io>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/swm050/gpio.h>
/**@{*/
/*---------------------------------------------------------------------------*/
/** @brief Set a Group of Pins
Set one or more pins of GPIO to 1. Please note that this chip doesn't support
atomic pin setting.
@param[in] gpios Pin identifiers @ref gpio_pin_id
If multiple pins are to be changed, use bitwise OR '|' to separate
them.
*/
void gpio_set(uint16_t gpios)
{
GPIO_DATA |= gpios;
}
/*---------------------------------------------------------------------------*/
/** @brief Clear a Group of Pins
Set one or more pins of GPIO to 0. Please note that this chip doesn't support
atomic pin setting.
@param[in] gpios Pin identifiers @ref gpio_pin_id
If multiple pins are to be changed, use bitwise OR '|' to separate
them.
*/
void gpio_clear(uint16_t gpios)
{
GPIO_DATA &= ~gpios;
}
/*---------------------------------------------------------------------------*/
/** @brief Read a Group of Pins.
@param[in] gpios Pin identifiers @ref gpio_pin_id
If multiple pins are to be read, use bitwise OR '|' to separate
them.
@return The pin values as a bitfield. The bit position of the pin
value returned corresponds to the pin number.
*/
uint16_t gpio_get(uint16_t gpios)
{
return GPIO_EXT & gpios;
}
/*---------------------------------------------------------------------------*/
/** @brief Toggle a Group of Pins
Toggle one or more pins of GPIO. The non-toggled pins are not affected.
@param[in] gpios Pin identifiers @ref gpio_pin_id
If multiple pins are to be changed, use bitwise OR '|' to separate
them.
*/
void gpio_toggle(uint16_t gpios)
{
uint32_t curr_status = GPIO_DATA & gpios;
GPIO_DATA = (GPIO_DATA & (~gpios)) | (~curr_status);
}
/*---------------------------------------------------------------------------*/
/** @brief Set the direction of a Group of Pins to Input
Set the direction of one or more pins of GPIO to input.
@param[in] gpios Pin identifiers @ref gpio_pin_id
If multiple pins are to be changed, use bitwise OR '|' to separate
them.
*/
void gpio_input(uint16_t gpios)
{
GPIO_DIR &= ~gpios;
}
/*---------------------------------------------------------------------------*/
/** @brief Set the direction of a Group of Pins to Output
Set the direction of one or more pins of GPIO to output.
@param[in] gpios Pin identifiers @ref gpio_pin_id
If multiple pins are to be changed, use bitwise OR '|' to separate
them.
*/
void gpio_output(uint16_t gpios)
{
GPIO_DIR |= gpios;
}
/*---------------------------------------------------------------------------*/
/** @brief Select the alternative function of a Group of Pins
Select the alternative function of one or more pins of GPIO.
@param[in] gpios Pin identifiers @ref gpio_pin_id
If multiple pins are to be changed, use bitwise OR '|' to separate
them.
@param[in] af_en Whether alternative function is selected
*/
void gpio_sel_af(uint16_t gpios, bool af_en)
{
if (gpios & GPIO0) {
GPIO_SEL = (GPIO_SEL & (~0x3)) | (af_en ? 0x1 : 0x0);
}
if (gpios & GPIO1) {
GPIO_SEL = (GPIO_SEL & (~0xc)) | (af_en ? 0x4 : 0x0);
}
if (gpios & GPIO2) {
GPIO_SEL = (GPIO_SEL & (~0x30)) | (af_en ? 0x10 : 0x0);
}
if (gpios & GPIO7) {
GPIO_SEL = (GPIO_SEL & (~0xc000)) | (af_en ? 0x4000 : 0x0);
}
}
/*---------------------------------------------------------------------------*/
/** @brief Enable the internal pull-up of a Group of Pins
Enable or disable the internal pull-up of one or more pins of GPIO.
@param[in] gpios Pin identifiers @ref gpio_pin_id
If multiple pins are to be changed, use bitwise OR '|' to separate
them.
@param[in] en Bool. Whether pull-up is enabled
*/
void gpio_pullup(uint16_t gpios, bool en)
{
if (en) {
GPIO_PULLUP |= gpios;
} else {
GPIO_PULLUP &= ~gpios;
}
}
/*---------------------------------------------------------------------------*/
/** @brief Enable the input function of a Group of Pins
Enable or disable the input function of one or more pins of GPIO. Disabling
the input function of pins decreases the power usage of the MCU.
@param[in] gpios Pin identifiers @ref gpio_pin_id
If multiple pins are to be changed, use bitwise OR '|' to separate
them.
@param[in] en true to enable input function.
*/
void gpio_in_en(uint16_t gpios, bool en)
{
if (en) {
GPIO_INEN &= ~gpios;
} else {
GPIO_INEN |= gpios;
}
}
/*---------------------------------------------------------------------------*/
/** @brief Select the SWD function of GPIO 1/2
Enable or disable the SWD debugging port at GPIO 1/2. When SWD debugging port
is enabled, GPIO and AF of the SWD pins will be both unavailable.
@param[in] en true to enable SWD.
*/
void gpio_sel_swd(bool en)
{
if (en) {
SWD_SEL = 1;
} else {
SWD_SEL = 0;
}
}
/**@}*/
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