mirror of https://github.com/ARMmbed/mbed-os.git
130 lines
4.0 KiB
C++
130 lines
4.0 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_BUSOUT_H
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#define MBED_BUSOUT_H
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#include "drivers/DigitalOut.h"
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#include "platform/PlatformMutex.h"
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#include "platform/NonCopyable.h"
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namespace mbed {
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/** \addtogroup drivers */
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/** A digital output bus, used for setting the state of a collection of pins
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* @ingroup drivers
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*/
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class BusOut : private NonCopyable<BusOut> {
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public:
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/** Create an BusOut, connected to the specified pins
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*
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* @param p0 DigitalOut pin to connect to bus bit
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* @param p1 DigitalOut pin to connect to bus bit
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* @param p2 DigitalOut pin to connect to bus bit
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* @param p3 DigitalOut pin to connect to bus bit
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* @param p4 DigitalOut pin to connect to bus bit
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* @param p5 DigitalOut pin to connect to bus bit
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* @param p6 DigitalOut pin to connect to bus bit
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* @param p7 DigitalOut pin to connect to bus bit
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* @param p8 DigitalOut pin to connect to bus bit
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* @param p9 DigitalOut pin to connect to bus bit
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* @param p10 DigitalOut pin to connect to bus bit
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* @param p11 DigitalOut pin to connect to bus bit
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* @param p12 DigitalOut pin to connect to bus bit
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* @param p13 DigitalOut pin to connect to bus bit
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* @param p14 DigitalOut pin to connect to bus bit
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* @param p15 DigitalOut pin to connect to bus bit
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*
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* @note Synchronization level: Thread safe
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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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BusOut(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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/** Create an BusOut, connected to the specified pins
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*
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* @param pins An array of pins to connect to bus the bit
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*/
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BusOut(PinName pins[16]);
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virtual ~BusOut();
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/** Write the value to the output bus
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*
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* @param value An integer specifying a bit to write for every corresponding DigitalOut pin
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*/
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void write(int value);
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/** Read the value currently output on the bus
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*
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* @returns
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* An integer with each bit corresponding to associated DigitalOut pin setting
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*/
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int read();
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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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{
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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 write()
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* \sa BusOut::write()
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*/
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BusOut &operator= (int v);
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BusOut &operator= (BusOut &rhs);
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/** Access to particular bit in random-iterator fashion
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* @param index Bit Position
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*/
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DigitalOut &operator[](int index);
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/** A shorthand for read()
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* \sa BusOut::read()
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*/
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operator int();
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#if !defined(DOXYGEN_ONLY)
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protected:
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virtual void lock();
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virtual void unlock();
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DigitalOut *_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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#endif
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};
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} // namespace mbed
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#endif
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