mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-10-03 18:09:02 -04:00
58 lines
1.4 KiB
C++
58 lines
1.4 KiB
C++
//
|
|
// FILE: FastShiftIn.cpp
|
|
// AUTHOR: Rob Tillaart
|
|
// VERSION: 0.1.3
|
|
// PURPOSE: shiftin
|
|
// DATE: 2013-09-29
|
|
// URL:
|
|
//
|
|
// Released to the public domain
|
|
//
|
|
|
|
#include "FastShiftIn.h"
|
|
|
|
FastShiftIn::FastShiftIn(const uint8_t datapin, const uint8_t clockpin, const uint8_t bitOrder)
|
|
{
|
|
_bitorder = bitOrder;
|
|
_value = FASTSHIFTIN_NOVALUE;
|
|
|
|
pinMode(datapin, INPUT);
|
|
pinMode(clockpin, INPUT);
|
|
|
|
// uint8_t _datatimer = digitalPinToTimer(datapin);
|
|
// if (_datatimer != NOT_ON_TIMER) turnOffPWM(_datatimer); TODO
|
|
uint8_t _dataport = digitalPinToPort(datapin);
|
|
_datain = portOutputRegister(_dataport);
|
|
_databit = digitalPinToBitMask(datapin);
|
|
|
|
// uint8_t _clocktimer = digitalPinToTimer(clockpin);
|
|
// if (_clocktimer != NOT_ON_TIMER) turnOffPWM(_clocktimer);
|
|
uint8_t _clockport = digitalPinToPort(clockpin);
|
|
_clockin = portOutputRegister(_clockport);
|
|
_clockbit = digitalPinToBitMask(clockpin);
|
|
}
|
|
|
|
|
|
int FastShiftIn::read()
|
|
{
|
|
_value = 0;
|
|
|
|
for (uint8_t i = 0, m = 1, n = 128; i < 8; i++, m <<=1, n >>= 1)
|
|
{
|
|
uint8_t oldSREG = SREG;
|
|
cli();
|
|
*_clockin |= _clockbit;
|
|
|
|
if ((*_datain & _databit) > 0)
|
|
{
|
|
if (_bitorder == LSBFIRST)
|
|
_value |= m;
|
|
else
|
|
_value |= n;
|
|
}
|
|
*_clockin &= ~_clockbit;
|
|
SREG = oldSREG;
|
|
}
|
|
return _value;
|
|
}
|
|
// -- END OF FILE --
|