/******************************************************************************
 * The MIT License
 *
 * Copyright (c) 2010 Perry Hung.
 *
 * 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.
*****************************************************************************/

/**
 * @file gpio.h
 * @brief General Purpose I/O (GPIO) interace.
 */

#ifndef _LIBMAPLE_GPIO_H_
#define _LIBMAPLE_GPIO_H_

#ifdef __cplusplus
extern "C"{
#endif

/*
 * Note: Series header must define:
 * - struct gpio_dev (and declare extern pointers to series-provided ones)
 * - enum gpio_pin_mode (TODO think hard on this)
 */
#include <series/gpio.h>
#include <libmaple/libmaple.h>

/*
 * GPIO Convenience routines
 */

void gpio_init(gpio_dev *dev);
void gpio_init_all(void);
/* TODO deprecate this? We should probably take a flags argument. */
void gpio_set_mode(gpio_dev *dev, uint8 pin, gpio_pin_mode mode);

/**
 * Set or reset a GPIO pin.
 *
 * Pin must have previously been configured to output mode.
 *
 * @param dev GPIO device whose pin to set.
 * @param pin Pin on to set or reset
 * @param val If true, set the pin.  If false, reset the pin.
 */
static inline void gpio_write_bit(gpio_dev *dev, uint8 pin, uint8 val) {
    val = !!val;
    dev->regs->BSRR = BIT(pin) << (16 * val);
}

/**
 * Determine whether or not a GPIO pin is set.
 *
 * Pin must have previously been configured to input mode.
 *
 * @param dev GPIO device whose pin to test.
 * @param pin Pin on dev to test.
 * @return True if the pin is set, false otherwise.
 */
static inline uint32 gpio_read_bit(gpio_dev *dev, uint8 pin) {
    return dev->regs->IDR & BIT(pin);
}

/**
 * Toggle a pin configured as output push-pull.
 * @param dev GPIO device.
 * @param pin Pin on dev to toggle.
 */
static inline void gpio_toggle_bit(gpio_dev *dev, uint8 pin) {
    dev->regs->ODR = dev->regs->ODR ^ BIT(pin);
}

#ifdef __cplusplus
}
#endif

#endif