File content as of revision 85:e1a8e879a6a9:

/* 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"

void gpio_init(gpio_t *obj, PinName pin, PinDirection direction) {
    if(pin == NC) return;

    obj->pin = pin;
    obj->mask = (1ul<<pin);

    obj->reg_set = &NRF_GPIO->OUTSET;
    obj->reg_clr = &NRF_GPIO->OUTCLR;
    obj->reg_in  = &NRF_GPIO->IN;
    obj->reg_dir = &NRF_GPIO->DIR;

    gpio_dir(obj, direction);
    switch (direction) {
        case PIN_OUTPUT: pin_mode(pin, PullNone); break;
        case PIN_INPUT : pin_mode(pin, PullUp); break;
    }
}

void gpio_mode(gpio_t *obj, PinMode mode) {
    pin_mode(obj->pin, mode);
}

void gpio_dir(gpio_t *obj, PinDirection direction) {
    switch (direction) {
        case PIN_INPUT :
        NRF_GPIO->PIN_CNF[obj->pin] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
                                        | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
                                        | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
                                        | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
                                        break;
        case PIN_OUTPUT: 
        NRF_GPIO->PIN_CNF[obj->pin] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
                                        | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
                                        | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
                                        | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
                                        | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
                                        break;
    }
}