File content as of revision 0:13413ea9a877:

/* 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.
 */
#ifndef MBED_BUSINOUT_H
#define MBED_BUSINOUT_H
 
#include "drivers/DigitalInOut.h"
#include "platform/PlatformMutex.h"
#include "platform/NonCopyable.h"
 
namespace mbed {
/** \addtogroup drivers */
 
/** A digital input output bus, used for setting the state of a collection of pins
 *
 * @note Synchronization level: Thread safe
 * @ingroup drivers
 */
class BusInOut : private NonCopyable<BusInOut> {
 
public:
 
    /** Create an BusInOut, connected to the specified pins
     *
     *  @param p0 DigitalInOut pin to connect to bus bit
     *  @param p1 DigitalInOut pin to connect to bus bit
     *  @param p2 DigitalInOut pin to connect to bus bit
     *  @param p3 DigitalInOut pin to connect to bus bit
     *  @param p4 DigitalInOut pin to connect to bus bit
     *  @param p5 DigitalInOut pin to connect to bus bit
     *  @param p6 DigitalInOut pin to connect to bus bit
     *  @param p7 DigitalInOut pin to connect to bus bit
     *  @param p8 DigitalInOut pin to connect to bus bit
     *  @param p9 DigitalInOut pin to connect to bus bit
     *  @param p10 DigitalInOut pin to connect to bus bit
     *  @param p11 DigitalInOut pin to connect to bus bit
     *  @param p12 DigitalInOut pin to connect to bus bit
     *  @param p13 DigitalInOut pin to connect to bus bit
     *  @param p14 DigitalInOut pin to connect to bus bit
     *  @param p15 DigitalInOut pin to connect to bus bit
     *
     *  @note
     *  It is only required to specify as many pin variables as is required
     *  for the bus; the rest will default to NC (not connected)
     */
    BusInOut(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
             PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
             PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
             PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);
 
    /** Create an BusInOut, connected to the specified pins
     *
     *  @param pins An array of pins to construct a BusInOut from
     */
    BusInOut(PinName pins[16]);
 
    virtual ~BusInOut();
 
    /* Group: Access Methods */
 
    /** Write the value to the output bus
     *
     *  @param value An integer specifying a bit to write for every corresponding DigitalInOut pin
     */
    void write(int value);
 
    /** Read the value currently output on the bus
     *
     *  @returns
     *    An integer with each bit corresponding to associated DigitalInOut pin setting
     */
    int read();
 
    /** Set as an output
     */
    void output();
 
    /** Set as an input
     */
    void input();
 
    /** Set the input pin mode
     *
     *  @param pull PullUp, PullDown, PullNone
     */
    void mode(PinMode pull);
 
    /** Binary mask of bus pins connected to actual pins (not NC pins)
     *  If bus pin is in NC state make corresponding bit will be cleared (set to 0), else bit will be set to 1
     *
     *  @returns
     *    Binary mask of connected pins
     */
    int mask() {
        // No lock needed since _nc_mask is not modified outside the constructor
        return _nc_mask;
    }
 
     /** A shorthand for write()
    * \sa BusInOut::write()
      */
    BusInOut& operator= (int v);
    BusInOut& operator= (BusInOut& rhs);
 
    /** Access to particular bit in random-iterator fashion
     * @param index  Bit Position
     */
    DigitalInOut& operator[] (int index);
 
    /** A shorthand for read()
     * \sa BusInOut::read()
     */
    operator int();
 
protected:
    virtual void lock();
    virtual void unlock();
    DigitalInOut* _pin[16];
 
    /* Mask of bus's NC pins
     * If bit[n] is set to 1 - pin is connected
     * if bit[n] is cleared - pin is not connected (NC)
     */
    int _nc_mask;
 
    PlatformMutex _mutex;
};
 
} // namespace mbed
 
#endif