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68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
//
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// FILE: FastShiftOut.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.03
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// PURPOSE: shiftout that implements the Print interface
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// DATE: 2013-08-22
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// URL:
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//
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// Released to the public domain
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//
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#include "FastShiftOut.h"
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//
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// Constructor
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// prepares the digitalWrite()
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FastShiftOut::FastShiftOut(uint8_t datapin, uint8_t clockpin, uint8_t bitOrder)
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{
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_bitorder = bitOrder;
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_value = -1;
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pinMode(datapin, OUTPUT);
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pinMode(clockpin, OUTPUT);
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// uint8_t _datatimer = digitalPinToTimer(datapin);
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// if (_datatimer != NOT_ON_TIMER) turnOffPWM(_datatimer); TODO
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uint8_t _dataport = digitalPinToPort(datapin);
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_dataout = portOutputRegister(_dataport);
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_databit = digitalPinToBitMask(datapin);
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// uint8_t _clocktimer = digitalPinToTimer(clockpin);
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// if (_clocktimer != NOT_ON_TIMER) turnOffPWM(_clocktimer);
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uint8_t _clockport = digitalPinToPort(clockpin);
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_clockout = portOutputRegister(_clockport);
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_clockbit = digitalPinToBitMask(clockpin);
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}
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//
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// write() must implement the virtual write of Print class
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//
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size_t FastShiftOut::write(uint8_t data)
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{
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_value = data;
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for (uint8_t i = 0; i < 8; i++)
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{
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uint8_t v;
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if (_bitorder == LSBFIRST) v = !!(_value & (1 << i));
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else v = !!(_value & (1 << (7 - i)));
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uint8_t oldSREG = SREG;
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cli();
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if (v == LOW) *_dataout &= ~_databit;
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else *_dataout |= _databit;
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*_clockout |= _clockbit;
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*_clockout &= ~_clockbit;
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SREG = oldSREG;
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}
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return 1;
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}
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//
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// reads back the last value written.
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//
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int FastShiftOut::read()
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{
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return _value;
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}
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// -- END OF FILE --
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