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57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
//
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// FILE: FastShiftIn.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.00
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// PURPOSE: shiftin
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// DATE: 2013-09-29
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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 "FastShiftIn.h"
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FastShiftIn::FastShiftIn(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, INPUT);
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pinMode(clockpin, INPUT);
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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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_datain = 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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_clockin = portOutputRegister(_clockport);
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_clockbit = digitalPinToBitMask(clockpin);
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}
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int FastShiftIn::read()
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{
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_value = 0;
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for (uint8_t i = 0; i < 8; i++)
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{
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uint8_t oldSREG = SREG;
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cli();
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*_clockin |= _clockbit;
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if ((*_datain & _databit) > 0)
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{
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if (_bitorder == LSBFIRST)
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_value |= (1 << i);
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else
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_value |= (1 << (7 - i));
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}
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*_clockin |= _clockbit;
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SREG = oldSREG;
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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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