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65 lines
1.3 KiB
C++
65 lines
1.3 KiB
C++
#pragma once
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//
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// FILE: FastShiftIn.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.4.0
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// PURPOSE: Fast ShiftIn for 74HC165 register, AVR optimized
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// DATE: 2013-09-29
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// URL: https://github.com/RobTillaart/FastShiftIn
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#include "Arduino.h"
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#define FASTSHIFTIN_LIB_VERSION (F("0.4.0"))
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// uncomment next line to get SPEED OPTIMIZED CODE
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// #define FASTSHIFTIN_AVR_LOOP_UNROLLED 1
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class FastShiftIn
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{
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public:
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// bitOrder = { LSBFIRST, MSBFIRST };
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FastShiftIn(uint8_t dataIn, uint8_t clockPin, uint8_t bitOrder = LSBFIRST);
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uint16_t read(void);
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uint16_t read16(void);
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uint32_t read24(void);
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uint32_t read32(void);
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uint32_t lastRead(void);
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// Experimental 0.3.4
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void read(uint8_t * array, uint8_t size);
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// returns false if bitOrder out of range.
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bool setBitOrder(uint8_t bitOrder);
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uint8_t getBitOrder(void);
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// overrule bitOrder (most optimized).
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uint8_t readLSBFIRST(void);
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uint8_t readMSBFIRST(void);
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private:
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uint8_t _bitOrder;
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uint32_t _lastValue;
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#if defined(ARDUINO_ARCH_AVR) || defined(ARDUINO_ARCH_MEGAAVR)
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volatile uint8_t *_dataInRegister;
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uint8_t _dataInBit;
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volatile uint8_t *_clockRegister;
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uint8_t _clockBit;
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#else
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uint8_t _dataPinIn;
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uint8_t _clockPin;
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#endif
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};
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// -- END OF FILE --
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