![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
temp
Dependencies: mbed SDFileSystem MS5607 ADXL345_I2C FATFileSystem
Diff: mbed/drivers/BusInOut.h
- Revision:
- 0:c88c3b616c00
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed/drivers/BusInOut.h Mon Mar 16 23:37:42 2020 +0900 @@ -0,0 +1,127 @@ +/* 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" + +namespace mbed { +/** \addtogroup drivers */ +/** @{*/ + +/** A digital input output bus, used for setting the state of a collection of pins + * + * @Note Synchronization level: Thread safe + */ +class BusInOut { + +public: + + /** Create an BusInOut, connected to the specified pins + * + * @param p<n> DigitalInOut pin to connect to bus bit p<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) + */ + 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); + + 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 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() { + // No lock needed since _nc_mask is not modified outside the constructor + return _nc_mask; + } + + /** A shorthand for write() + */ + BusInOut& operator= (int v); + BusInOut& operator= (BusInOut& rhs); + + /** Access to particular bit in random-iterator fashion + */ + DigitalInOut& operator[] (int index); + + /** A shorthand for 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; + + /* disallow copy constructor and assignment operators */ +private: + BusInOut(const BusInOut&); + BusInOut & operator = (const BusInOut&); +}; + +} // namespace mbed + +#endif + +/** @}*/