inital version

shiftreg.h

@@ -0,0 +1,43 @@
+#pragma once
+#include <util/delay.h>
+template <int BITS> class ShiftReg
+{
+private:
+    static constexpr int BYTES = (BITS % 8 == 0) ? (BITS/8) : (BITS/8+1);
+    
+    volatile unsigned char *_port;
+    const unsigned char _pinSer;
+    const unsigned char _pinSerClk;
+    const unsigned char _pinRClk;
+    
+public:
+    
+    ShiftReg(volatile unsigned char* const port, const unsigned char pinSer, const unsigned char pinSerClk, const unsigned char pinRClk):
+    _port(port),  _pinSer(pinSer), _pinSerClk(pinSerClk), _pinRClk(pinRClk)
+    {
+        clear();
+    }
+    void write(const unsigned char * const in)
+    {
+        *_port &= ~((1<<_pinSer) | (1<<_pinSerClk));
+        *_port |= 1<<_pinRClk;
+        for(unsigned char i = 0; i < BITS; ++i)
+        {
+            *_port &= ~(1 << _pinSerClk);
+            in[i/8] & (1<<(i%8)) ? (*_port |= (1 << _pinSer)) : (*_port &= ~(1 << _pinSer));
+            *_port |= (1 << _pinSerClk);
+        }
+        *_port &= ~(1<<_pinRClk);
+    }
+    void clear()
+    {
+        *_port &= ~((1<<_pinSer) | (1<<_pinSerClk));
+        *_port |= 1<<_pinRClk;
+        for(unsigned char i = 0; i < BITS; ++i)
+        {
+            *_port &= ~(1 << _pinSerClk);
+            *_port |= (1 << _pinSerClk);
+        }
+        *_port &= ~(1<<_pinRClk);
+    }
+};