diff options
Diffstat (limited to 'libopencm3/lib/stm32/common/gpio_common_all.c')
| -rw-r--r-- | libopencm3/lib/stm32/common/gpio_common_all.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/libopencm3/lib/stm32/common/gpio_common_all.c b/libopencm3/lib/stm32/common/gpio_common_all.c new file mode 100644 index 0000000..3821928 --- /dev/null +++ b/libopencm3/lib/stm32/common/gpio_common_all.c @@ -0,0 +1,151 @@ +/** @addtogroup gpio_file + +@author @htmlonly © @endhtmlonly 2009 Uwe Hermann <uwe@hermann-uwe.de> + +*/ + +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de> + * + * 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/>. + */ + +#define WEAK __attribute__((weak)) + +#include <libopencm3/stm32/gpio.h> + +/**@{*/ + +/*---------------------------------------------------------------------------*/ +/** @brief Set a Group of Pins Atomic + +Set one or more pins of the given GPIO port to 1 in an atomic operation. + +@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id +@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id + If multiple pins are to be changed, use logical OR '|' to separate + them. +*/ +void gpio_set(uint32_t gpioport, uint16_t gpios) +{ + GPIO_BSRR(gpioport) = gpios; +} + +/*---------------------------------------------------------------------------*/ +/** @brief Clear a Group of Pins Atomic + +Clear one or more pins of the given GPIO port to 0 in an atomic operation. + +@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id +@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id + If multiple pins are to be changed, use logical OR '|' to separate + them. +*/ +void gpio_clear(uint32_t gpioport, uint16_t gpios) +{ + GPIO_BSRR(gpioport) = (gpios << 16); +} + +/*---------------------------------------------------------------------------*/ +/** @brief Read a Group of Pins. + +@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id +@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id + If multiple pins are to be read, use logical OR '|' to separate + them. +@return Unsigned int16 value of the pin values. The bit position of the pin + value returned corresponds to the pin number. +*/ +uint16_t gpio_get(uint32_t gpioport, uint16_t gpios) +{ + return gpio_port_read(gpioport) & gpios; +} + +/*---------------------------------------------------------------------------*/ +/** @brief Toggle a Group of Pins + +Toggle one or more pins of the given GPIO port. This is not an atomic operation. + +@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id +@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id + If multiple pins are to be changed, use logical OR '|' to separate + them. +*/ +void gpio_toggle(uint32_t gpioport, uint16_t gpios) +{ + GPIO_ODR(gpioport) ^= gpios; +} + +/*---------------------------------------------------------------------------*/ +/** @brief Read from a Port + +Read the current value of the given GPIO port. Only the lower 16 bits contain +valid pin data. + +@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id +@return Unsigned int16. The value held in the specified GPIO port. +*/ +uint16_t gpio_port_read(uint32_t gpioport) +{ + return (uint16_t)GPIO_IDR(gpioport); +} + +/*---------------------------------------------------------------------------*/ +/** @brief Write to a Port + +Write a value to the given GPIO port. + +@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id +@param[in] data Unsigned int16. The value to be written to the GPIO port. +*/ +void gpio_port_write(uint32_t gpioport, uint16_t data) +{ + GPIO_ODR(gpioport) = data; +} + +/*---------------------------------------------------------------------------*/ +/** @brief Lock the Configuration of a Group of Pins + +The configuration of one or more pins of the given GPIO port is locked. There +is no mechanism to unlock these via software. Unlocking occurs at the next +reset. + +@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id +@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id + If multiple pins are to be locked, use logical OR '|' to separate + them. +*/ +void gpio_port_config_lock(uint32_t gpioport, uint16_t gpios) +{ + uint32_t reg32; + + /* Special "Lock Key Writing Sequence", see datasheet. */ + GPIO_LCKR(gpioport) = GPIO_LCKK | gpios; /* Set LCKK. */ + GPIO_LCKR(gpioport) = ~GPIO_LCKK & gpios; /* Clear LCKK. */ + GPIO_LCKR(gpioport) = GPIO_LCKK | gpios; /* Set LCKK. */ + reg32 = GPIO_LCKR(gpioport); /* Read LCKK. */ + reg32 = GPIO_LCKR(gpioport); /* Read LCKK again. */ + + /* Tell the compiler the variable is actually used. It will get + * optimized out anyways. + */ + reg32 = reg32; + + /* If (reg32 & GPIO_LCKK) is true, the lock is now active. */ +} + +/**@}*/ + |