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https://github.com/RobTillaart/Arduino.git
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91 lines
2.0 KiB
C++
91 lines
2.0 KiB
C++
//
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// FILE: PinOutGroup.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.1
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// DATE: 2017-04-26
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// PURPOSE: PinOutGroup library for Arduino
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// goal is to easily change a group of pins that logically
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// belong to each other e.g. 8 data pins of a parallel printer.
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// these pins can be in any order.
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// URL:
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// http://forum.arduino.cc/index.php?topic=469599.0
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//
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// 0.1.0 - 20-08-2017 initial version (based upon experimental pinGroup)
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// 0.1.1 - 2020-05-19 main refactor;
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// added tests; added clear(); added write(idx, value)
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// renamed set to write() to be in line with digitalWrite()
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//
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//
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#include "PinOutGroup.h"
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PinOutGroup::PinOutGroup()
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{
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clear();
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}
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void PinOutGroup::clear()
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{
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// safety: set all to LOW before cleaning up.
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for (uint8_t i = 0; i < _size; i++) digitalWrite(_pins[i], LOW);
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_size = 0;
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}
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bool PinOutGroup::add(uint8_t sz, uint8_t* ar, uint8_t value)
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{
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bool b = true;
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for (uint8_t i = 0; i < sz && b; i++)
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{
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b = b && add(ar[i], value);
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}
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return b;
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}
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bool PinOutGroup::add(uint8_t pin, uint8_t value)
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{
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if (_size >= PINOUTGROUP_MAXSIZE) return false;
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_pins[_size] = pin;
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pinMode(pin, OUTPUT);
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digitalWrite(pin, value);
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_size++;
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return true;
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}
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uint8_t PinOutGroup::write(uint16_t value)
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{
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uint16_t changed = _lastValue ^ value; // detect pins that changed
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if (changed == 0) return 0;
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uint16_t bitMask = 1;
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uint8_t changeCount = 0;
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for (uint8_t i = 0; i < _size; i++)
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{
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if ((changed & bitMask) > 0)
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{
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digitalWrite(_pins[i], (value & bitMask) > 0);
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changeCount++;
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}
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bitMask <<= 1;
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}
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_lastValue = value;
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return changeCount;
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}
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uint8_t PinOutGroup::write(uint8_t idx, uint8_t value)
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{
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if (idx >= _size) return 0;
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uint16_t mask = (1 << idx);
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uint16_t lv = _lastValue & mask;
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if ((value > 0) == (lv > 0)) return 0; // no change
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digitalWrite(_pins[idx], value);
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if (value == LOW) _lastValue &= ~mask;
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else _lastValue |= mask;
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return 1;
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}
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// --- END OF FILE ---
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