mirror of https://github.com/ARMmbed/mbed-os.git
109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBED_BUSIN_H
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#define MBED_BUSIN_H
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#include "platform/platform.h"
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#include "drivers/DigitalIn.h"
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#include "platform/PlatformMutex.h"
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namespace mbed {
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/** \addtogroup drivers */
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/** @{*/
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/** A digital input bus, used for reading the state of a collection of pins
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*
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* @Note Synchronization level: Thread safe
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*/
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class BusIn {
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public:
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/* Group: Configuration Methods */
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/** Create an BusIn, connected to the specified pins
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*
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* @param <n> DigitalIn pin to connect to bus bit <n> (p5-p30, NC)
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*
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* @note
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* It is only required to specify as many pin variables as is required
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* for the bus; the rest will default to NC (not connected)
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*/
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BusIn(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
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PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
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PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
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PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);
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BusIn(PinName pins[16]);
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virtual ~BusIn();
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/** Read the value of the input bus
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*
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* @returns
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* An integer with each bit corresponding to the value read from the associated DigitalIn pin
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*/
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int read();
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/** Set the input pin mode
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*
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* @param mode PullUp, PullDown, PullNone
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*/
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void mode(PinMode pull);
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/** Binary mask of bus pins connected to actual pins (not NC pins)
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* If bus pin is in NC state make corresponding bit will be cleared (set to 0), else bit will be set to 1
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*
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* @returns
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* Binary mask of connected pins
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*/
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int mask() {
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// No lock needed since _nc_mask is not modified outside the constructor
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return _nc_mask;
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}
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/** A shorthand for read()
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*/
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operator int();
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/** Access to particular bit in random-iterator fashion
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*/
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DigitalIn & operator[] (int index);
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protected:
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DigitalIn* _pin[16];
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/** Mask of bus's NC pins
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* If bit[n] is set to 1 - pin is connected
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* if bit[n] is cleared - pin is not connected (NC)
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*/
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int _nc_mask;
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PlatformMutex _mutex;
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/* disallow copy constructor and assignment operators */
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private:
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virtual void lock();
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virtual void unlock();
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BusIn(const BusIn&);
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BusIn & operator = (const BusIn&);
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};
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} // namespace mbed
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#endif
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/** @}*/
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