File content as of revision 188:60408c49b6d4:

/* mbed Microcontroller Library
 *******************************************************************************
 * Copyright (c) 2016, STMicroelectronics
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of STMicroelectronics nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *******************************************************************************
 */
#ifndef MBED_GPIO_OBJECT_H
#define MBED_GPIO_OBJECT_H

#include "mbed_assert.h"
#include "cmsis.h"
#include "PortNames.h"
#include "PeripheralNames.h"
#include "PinNames.h"

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Note: reg_clr might actually be same as reg_set.
 * Depends on family whether BRR is available on top of BSRR
 * if BRR does not exist, family shall define GPIO_IP_WITHOUT_BRR
 */
typedef struct {
    uint32_t mask;
    __IO uint32_t *reg_in;
    __IO uint32_t *reg_set;
    __IO uint32_t *reg_clr;
    PinName  pin;
    GPIO_TypeDef *gpio;
    uint32_t ll_pin;
} gpio_t;

static inline void gpio_write(gpio_t *obj, int value)
{
    if (value) {
        *obj->reg_set = obj->mask;
    } else {
#ifdef GPIO_IP_WITHOUT_BRR
        *obj->reg_clr = obj->mask << 16;
#else
        *obj->reg_clr = obj->mask;
#endif
    }
}

static inline int gpio_read(gpio_t *obj)
{
    return ((*obj->reg_in & obj->mask) ? 1 : 0);
}

static inline int gpio_is_connected(const gpio_t *obj)
{
    return obj->pin != (PinName)NC;
}


#ifdef __cplusplus
}
#endif

#endif