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drivers/BusIn.h
- Committer:
- kevman
- Date:
- 2018-11-28
- Revision:
- 0:38ceb79fef03
File content as of revision 0:38ceb79fef03:
/* 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_BUSIN_H #define MBED_BUSIN_H #include "platform/platform.h" #include "drivers/DigitalIn.h" #include "platform/PlatformMutex.h" #include "platform/NonCopyable.h" namespace mbed { /** \addtogroup drivers */ /** A digital input bus, used for reading the state of a collection of pins * * @note Synchronization level: Thread safe * @ingroup drivers */ class BusIn : private NonCopyable<BusIn> { public: /* Group: Configuration Methods */ /** Create an BusIn, connected to the specified pins * * @param p0 DigitalIn pin to connect to bus bit * @param p1 DigitalIn pin to connect to bus bit * @param p2 DigitalIn pin to connect to bus bit * @param p3 DigitalIn pin to connect to bus bit * @param p4 DigitalIn pin to connect to bus bit * @param p5 DigitalIn pin to connect to bus bit * @param p6 DigitalIn pin to connect to bus bit * @param p7 DigitalIn pin to connect to bus bit * @param p8 DigitalIn pin to connect to bus bit * @param p9 DigitalIn pin to connect to bus bit * @param p10 DigitalIn pin to connect to bus bit * @param p11 DigitalIn pin to connect to bus bit * @param p12 DigitalIn pin to connect to bus bit * @param p13 DigitalIn pin to connect to bus bit * @param p14 DigitalIn pin to connect to bus bit * @param p15 DigitalIn 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) */ 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); /** Create an BusIn, connected to the specified pins * * @param pins An array of pins to connect to bus bit */ 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 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 read() * \sa DigitalIn::read() */ operator int(); /** Access to particular bit in random-iterator fashion * @param index Position of bit */ DigitalIn &operator[](int index); protected: 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; PlatformMutex _mutex; private: virtual void lock(); virtual void unlock(); }; } // namespace mbed #endif