82 lines
1.8 KiB
C++
82 lines
1.8 KiB
C++
#pragma once
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#include <util/delay.h>
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template <int BITS> class ShiftReg
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{
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private:
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static constexpr int BYTES = (BITS % 8 == 0) ? (BITS/8) : (BITS/8+1);
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static constexpr bool invert = true;
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volatile unsigned char *_port;
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const unsigned char _pinSer;
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const unsigned char _pinSerClk;
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const unsigned char _pinRClk;
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unsigned char _lastData[BYTES] = {};
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public:
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ShiftReg(volatile unsigned char* const port, const unsigned char pinSer, const unsigned char pinSerClk,
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const unsigned char pinRClk):
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_port(port), _pinSer(pinSer), _pinSerClk(pinSerClk), _pinRClk(pinRClk)
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{
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clear();
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}
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void setBit(unsigned char bit, bool value)
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{
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if(BITS <= bit)
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return;
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bit = BITS - bit - 1;
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if(value)
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_lastData[bit/8] |= (1<<(bit%8));
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else
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_lastData[bit/8] &= ~(1<<(bit%8));
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write(_lastData);
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}
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bool getBit(unsigned char bit)
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{
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if(BITS <= bit)
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return false;
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bit = BITS - bit - 1;
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return _lastData[bit/8] & (1<<(bit%8));
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}
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void write(const unsigned char * const in)
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{
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for(unsigned char i = 0 ; i < BYTES; ++i)
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_lastData[i] = in[i];
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if constexpr(invert)
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{
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*_port |= ((1<<_pinSer) | (1<<_pinSerClk));
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*_port |= (1<<_pinRClk);
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for(unsigned char i = 0; i < BITS; ++i)
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{
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in[i/8] & (1<<(i%8)) ? (*_port &= ~(1 << _pinSer)) : (*_port |= (1 << _pinSer));
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*_port |= (1 << _pinSerClk);
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*_port &= ~(1 << _pinSerClk);
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}
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*_port &= ~(1<<_pinRClk);
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}
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else
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{
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*_port &= ~((1<<_pinSer) | (1<<_pinSerClk));
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*_port &= ~(1<<_pinRClk);
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for(unsigned char i = 0; i < BITS; ++i)
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{
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*_port &= ~(1 << _pinSerClk);
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in[i/8] & (1<<(i%8)) ? (*_port |= (1 << _pinSer)) : (*_port &= ~(1 << _pinSer));
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*_port |= (1 << _pinSerClk);
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}
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*_port |= 1<<_pinRClk;
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}
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}
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void clear(bool value = false)
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{
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for(unsigned char i = 0 ; i < BYTES; ++i)
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_lastData[i] = value ? 0xff : 0x00;
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write(_lastData);
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}
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};
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