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117 lines
3.7 KiB
117 lines
3.7 KiB
3 months ago
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/** @defgroup syscon_file SYSCON peripheral API
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* @ingroup peripheral_apis
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* @brief SWM050 SYSCON API.
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* LGPL License Terms @ref lgpl_license
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* @author @htmlonly © @endhtmlonly 2019
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* Icenowy Zheng <icenowy@aosc.io>
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* @author @htmlonly © @endhtmlonly 2019
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* Caleb Szalacinski <contact@skiboy.net>
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2019 Icenowy Zheng <icenowy@aosc.io>
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* Copyright (C) 2019 Caleb Szalacinski <contact@skiboy.net>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**@{*/
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#include <libopencm3/swm050/syscon.h>
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#include <libopencm3/swm050/gpio.h>
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/*---------------------------------------------------------------------------*/
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/** @brief Select the alternative function of a Group of Pins
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Select the alternative function of one or more pins of GPIO.
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@param[in] gpios Pin identifiers @ref gpio_pin_id
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If multiple pins are to be changed, use bitwise OR '|' to separate
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them.
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@param[in] af_en Whether alternative function is selected
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*/
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void syscon_sel_af(uint16_t gpios, bool af_en)
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{
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uint32_t masked_reg32;
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if (gpios & GPIO0) {
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masked_reg32 = SYSCON_PORTA_SEL & (~0x3);
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SYSCON_PORTA_SEL = masked_reg32 | (af_en ? 0x1 : 0x0);
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}
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if (gpios & GPIO1) {
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masked_reg32 = SYSCON_PORTA_SEL & (~0xc);
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SYSCON_PORTA_SEL = masked_reg32 | (af_en ? 0x4 : 0x0);
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}
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if (gpios & GPIO2) {
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masked_reg32 = SYSCON_PORTA_SEL & (~0x30);
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SYSCON_PORTA_SEL = masked_reg32 | (af_en ? 0x10 : 0x0);
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}
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if (gpios & GPIO7) {
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masked_reg32 = SYSCON_PORTA_SEL & (~0xc000);
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SYSCON_PORTA_SEL = masked_reg32 | (af_en ? 0x4000 : 0x0);
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}
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Enable the internal pull-up of a Group of Pins
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Enable or disable the internal pull-up of one or more pins of GPIO.
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@param[in] gpios Pin identifiers @ref gpio_pin_id
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If multiple pins are to be changed, use bitwise OR '|' to separate
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them.
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@param[in] en True to enable pull-up, false to disable.
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*/
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void syscon_pullup(uint16_t gpios, bool en)
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{
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if (en) {
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SYSCON_PORTA_PULLUP |= gpios;
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} else {
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SYSCON_PORTA_PULLUP &= ~gpios;
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}
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Enable the input function of a Group of Pins
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Enable or disable the input function of one or more pins of GPIO. Disabling
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the input function of pins decreases the power usage of the MCU.
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@param[in] gpios Pin identifiers @ref gpio_pin_id
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If multiple pins are to be changed, use bitwise OR '|' to separate
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them.
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@param[in] en True to enable input function.
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*/
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void syscon_input_enable(uint16_t gpios, bool en)
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{
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if (en) {
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SYSCON_PORTA_INEN &= ~gpios;
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} else {
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SYSCON_PORTA_INEN |= gpios;
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}
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Select the SWD function of GPIO 1/2
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Enable or disable the SWD debugging port at GPIO 1/2. When SWD debugging port
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is enabled, GPIO and AF of the SWD pins will be both unavailable.
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@param[in] en True to enable SWD.
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*/
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void syscon_sel_swd(bool en)
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{
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SYSCON_SWD_SEL = en;
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}
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/**@}*/
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