Diff: ShiftRegister.h

Revision:

0:46b1b63c40e6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ShiftRegister.h	Wed Oct 30 18:15:52 2013 +0000
@@ -0,0 +1,56 @@
+#include "mbed.h"
+#ifndef SHIFTREGISTER_H
+#define SHIFTREGISTER_H
+
+
+class ShiftRegister {
+
+public:
+
+/*
+* Constructor
+*/
+ShiftRegister(DigitalOut &clk, DigitalOut &dat, 
+                DigitalOut &latch, DigitalOut &clr, 
+                DigitalOut &oe);
+
+/*
+* Destructor
+*/
+~ShiftRegister();
+
+/*
+* Write Value
+*/
+template <typename T>
+int write(T val, int bits);
+
+void clear();
+
+private:
+DigitalOut &_clk;
+DigitalOut &_dat;
+DigitalOut &_latch;
+DigitalOut &_clr;
+DigitalOut &_oe;
+
+}; // end class ShiftRegister
+
+
+template <typename T>
+int ShiftRegister::write(T val, int bits) {        
+    T tmpval = ~0;
+    int tmpsz = sizeof(val)*8;
+    val = tmpval & val;  
+    bits = tmpsz < bits ? tmpsz : bits;
+    for(char i = 0; i < bits; i++) {
+        _dat.write((val >> i) & 0x01);        
+        _clk = 0;        
+        _clk = 1;
+    }
+    _latch = 0; 
+    _latch =1;
+    return val;
+}
+
+#endif //ShiftRegister
\ No newline at end of file