File content as of revision 534:6cdb58309977:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "gpio_api.h"
#include "pinmap.h"
#include "em_cmu.h"
#include "mbed_assert.h"
#include "sleepmodes.h"

uint8_t gpio_get_index(gpio_t *obj)
{
    return 0;
}

/*
 * @return the GPIO port mask for this pin
 * Pin and port index encoded in one uint32.
 * First four bits represent the pin number
 * The remaining bits represent the pin mode
 */
uint32_t gpio_set(PinName pin)
{
    return 1 << ((uint32_t) pin & 0xF);
}

void gpio_init(gpio_t *obj, PinName pin)
{
    MBED_ASSERT(pin != NC);

    CMU_ClockEnable(cmuClock_HFPER, true);
    CMU_ClockEnable(cmuClock_GPIO, true);
    obj->pin = pin;
    obj->mask = gpio_set(pin);
    obj->port = pin >> 4;
}

void gpio_pin_enable(gpio_t *obj, uint8_t enable)
{
    if (enable) {
        pin_mode(obj->pin, obj->mode);
    } else {
        pin_mode(obj->pin, Disabled); // TODO_LP return mode to default value
    }
}

void gpio_mode(gpio_t *obj, PinMode mode)
{
    obj->mode = mode; // Update object
    pin_mode(obj->pin, mode); // Update register
    
    //Handle pullup for input
    if(mode == InputPullUp) {
        //Set DOUT
        GPIO->P[obj->port & 0xF].DOUTSET = 1 << (obj->pin & 0xF);
    }
}

// Used by DigitalInOut to set correct mode when direction is set
void gpio_dir(gpio_t *obj, PinDirection direction)
{
    obj->dir = direction;
    switch (direction) {
        case PIN_INPUT:
            gpio_mode(obj, PullDefault);
            break;
        case PIN_OUTPUT:
            gpio_mode(obj, PullNone);
            break;
    }
}