File content as of revision 270:e2babe29baf8:

/* mbed Microcontroller Library
 * Copyright (c) 2013 Nordic Semiconductor
 *
 * 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 "port_api.h"
#include "pinmap.h"
#include "gpio_api.h"

PinName port_pin(PortName port, int pin_n) {
    return (PinName)(pin_n);
}

void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {
    obj->port = port;
    obj->mask = mask;   
    
    obj->reg_out = &NRF_GPIO->OUT;
    obj->reg_in  = &NRF_GPIO->IN;
    obj->reg_cnf = NRF_GPIO->PIN_CNF;
    
    port_dir(obj, dir);
}

void port_mode(port_t *obj, PinMode mode) {
    uint32_t i;
    // The mode is set per pin: reuse pinmap logic
    for (i=0; i<31; i++) {
        if (obj->mask & (1<<i)) {
            pin_mode(port_pin(obj->port, i), mode);
        }
    }
}

void port_dir(port_t *obj, PinDirection dir) {
    int i;
    switch (dir) {
        case PIN_INPUT : 
        for (i=0; i<31; i++) {
            if (obj->mask & (1<<i)) {
                obj->reg_cnf[i] = (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:
        for (i=0; i<31; i++) {
            if (obj->mask & (1<<i)) {
                obj->reg_cnf[i] = (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;
    }
}

void port_write(port_t *obj, int value) {
    *obj->reg_out = value;
}

int port_read(port_t *obj) {
    return (*obj->reg_in);
}