initial version of FastShiftOut

libraries/FastShiftOut/FastShiftOut.cpp

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+//
+//    FILE: FastShiftOut.cpp
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1
+// PURPOSE: 
+//     URL:
+//
+// Released to the public domain
+//
+
+#include "FastShiftOut.h"
+
+FastShiftOut::FastShiftOut(uint8_t datapin, uint8_t clockpin, uint8_t bitOrder)
+{
+    _datapin = datapin;
+    _clockpin = clockpin;
+    _bitorder = bitOrder;
+    _value = -1;
+    pinMode(_datapin, OUTPUT);
+    pinMode(_clockpin, OUTPUT);
+    
+    _datatimer  = digitalPinToTimer(_datapin);
+	_databit    = digitalPinToBitMask(_datapin);
+	_dataport   = digitalPinToPort(_datapin);
+    // if (_datatimer != NOT_ON_TIMER) turnOffPWM(_datatimer);
+    _dataout = portOutputRegister(_dataport);
+    
+    _clocktimer = digitalPinToTimer(_clockpin);
+	_clockbit   = digitalPinToBitMask(_clockpin);
+	_clockport  = digitalPinToPort(_clockpin);
+    // if (_clocktimer != NOT_ON_TIMER) turnOffPWM(_clocktimer);
+    _clockout = portOutputRegister(_clockport);
+}
+
+void FastShiftOut::write(uint8_t data)
+{
+    _value = data;
+    for (uint8_t i = 0; i < 8; i++)  
+    {
+        uint8_t v;
+        if (_bitorder == LSBFIRST)   v = !!(_value & (1 << i));
+        else                        v = !!(_value & (1 << (7 - i)));
+        
+        uint8_t oldSREG = SREG;
+        cli();
+        if (v == LOW)  *_dataout &= ~_databit;
+        else           *_dataout |= _databit;
+        *_clockout |= _clockbit;
+        *_clockout &= ~_clockbit;
+        SREG = oldSREG;
+    }
+}
+
+int FastShiftOut::read()
+{
+    return _value;
+}
+
+// -- END OF FILE --

libraries/FastShiftOut/FastShiftOut.h

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+//
+//    FILE: FastShiftOut.h
+//  AUTHOR: Rob Tillaart
+// VERSION: 0.1
+// PURPOSE: 
+//     URL:
+//
+// Released to the public domain
+//
+
+#ifndef FastShiftOut_h
+#define FastShiftOut_h
+
+#if defined(ARDUINO) && ARDUINO >= 100
+  #include "Arduino.h"
+#else
+  #include "WProgram.h"
+#endif
+
+#define FASTSHIFTOUT_LIB_VERSION "0.1.00"
+
+class FastShiftOut
+{
+  public:
+	FastShiftOut(uint8_t, uint8_t, uint8_t);
+    void write(uint8_t);
+    int read(void);
+
+  private:
+    uint8_t _datapin;
+    uint8_t _clockpin;
+    uint8_t _bitorder;
+    int _value;
+    
+    uint8_t _datatimer;
+	uint8_t _databit;
+	uint8_t _dataport;
+    volatile uint8_t *_dataout;
+        
+    uint8_t _clocktimer;
+	uint8_t _clockbit;
+	uint8_t _clockport;
+    volatile uint8_t *_clockout;
+    
+};
+
+#endif
+// -- END OF FILE --

libraries/FastShiftOut/FastShiftOut.txt

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+
+TODO
+- examples