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Diffstat (limited to 'lib/swm050/gpio.c')
| -rw-r--r-- | lib/swm050/gpio.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/lib/swm050/gpio.c b/lib/swm050/gpio.c new file mode 100644 index 00000000..fdf50996 --- /dev/null +++ b/lib/swm050/gpio.c @@ -0,0 +1,197 @@ +/** @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; + } +} + +/**@}*/ |