inital nfc code

inputshiftreg.h

@@ -0,0 +1,75 @@
+#pragma once
+
+template <int BITS> class InputShiftReg
+{
+private:
+	static constexpr int BYTES = (BITS % 8 == 0) ? (BITS/8) : (BITS/8+1);
+
+	static constexpr bool invert = true;
+	static constexpr bool invertInput = false;
+
+	volatile unsigned char *_port;
+	volatile unsigned char *_pin;
+	const unsigned char _pinSerOut;
+	const unsigned char _pinClk;
+	const unsigned char _pinParallelLoad;
+	
+	unsigned char data[BYTES];
+
+public:
+
+	InputShiftReg(volatile unsigned char* const portReg, volatile unsigned char* const pinReg,
+		const unsigned char clk, const unsigned char serOut, const unsigned char parallelLoad):
+		_port(portReg), _pin(pinReg), _pinSerOut(serOut), _pinClk(clk), _pinParallelLoad(parallelLoad)
+	{
+	}
+	bool getBit(unsigned char bit)
+	{
+		if(BITS <= bit)
+			return false;
+		bit = BITS - bit - 1;
+		return data[bit/8] & (1<<(bit%8));
+	}
+	unsigned char* read()
+	{
+		if constexpr(invert)
+		{
+			*_port &= ~(1<<_pinParallelLoad);
+			*_port |= (1<<_pinParallelLoad);
+			*_port &= ~(1<<_pinParallelLoad);
+
+			for(unsigned char i = 0; i < BITS; ++i)
+			{
+				*_port &= ~(1 << _pinClk);
+				bool value = *_pin & (1 << _pinSerOut);
+				if constexpr(invertInput)
+					value = !value;
+				if(value)
+					data[i/8] |= (1<<(i%8));
+				else
+					data[i/8] &= ~(1<<(i%8));
+				*_port |= (1 << _pinClk);
+			}
+		}
+		else
+		{
+			*_port |= (1<<_pinParallelLoad);
+			*_port &= ~(1<<_pinParallelLoad);
+			*_port |= (1<<_pinParallelLoad);
+
+			for(unsigned char i = 0; i < BITS; ++i)
+			{
+				*_port |= (1 << _pinClk);
+				bool value = *_pin & (1 << _pinSerOut);
+				if constexpr(invertInput)
+					value = !value;
+				if(value)
+					data[i/8] |= (1<<(i%8));
+				else
+					data[i/8] &= ~(1<<(i%8));
+				*_port &= ~(1 << _pinClk);
+			}
+		}
+		return data;
+	}
+};