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/* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#ifndef MBED_BUSIN_H
#define MBED_BUSIN_H
#include "platform.h"
#include "DigitalIn.h"
namespace mbed {
/** A digital input bus, used for reading the state of a collection of pins
class BusIn {
/* Group: Configuration Methods */
/** Create an BusIn, connected to the specified pins
* @param <n> DigitalIn pin to connect to bus bit <n> (p5-p30, NC)
* @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)
BusIn(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);
BusIn(PinName pins[16]);
virtual ~BusIn();
/** Read the value of the input bus
* @returns
* An integer with each bit corresponding to the value read from the associated DigitalIn pin
int read();
/** Set the input pin mode
* @param mode 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() {
return _nc_mask;
/** A shorthand for read()
operator int();
/** Access to particular bit in random-iterator fashion
DigitalIn & operator[] (int index);
DigitalIn* _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;
/* disallow copy constructor and assignment operators */
BusIn(const BusIn&);
BusIn & operator = (const BusIn&);
} // namespace mbed