Diff: ShiftReg.cpp

Revision:

0:a0e3fd47970f

diff -r 000000000000 -r a0e3fd47970f ShiftReg.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ShiftReg.cpp	Fri Nov 09 01:03:30 2012 +0000
@@ -0,0 +1,64 @@
+#include "mbed.h"
+#include "ShiftReg.h"
+
+#define MY_DEBUG 0
+
+ShiftReg::ShiftReg
+(PinName data
+,PinName store
+,PinName clock
+): _ds(data), _st(store), _sh(clock)
+{
+}
+
+
+void ShiftReg::ShiftByte
+(int8_t  data
+,BitOrd  ord
+)
+{
+    uint8_t mask;
+    
+    if (ord == MSBFirst) mask = 0x80;
+    else                 mask = 0x01;
+    
+    for (int i = 0; i < 8; i++)
+    {
+        if (data & mask) _ds = 1;
+        else             _ds = 0;
+
+#if MY_DEBUG > 0
+        printf("%d ", _ds.read());
+#endif /* MY_DEBUG */
+
+        if (ord == MSBFirst) mask = mask >> 1;
+        else                 mask = mask << 1;
+        
+        _sh = 0;
+        _sh = 1;
+    }
+
+#if MY_DEBUG > 0
+    printf("\n");
+#endif /* MY_DEBUG */
+
+}
+
+void
+ShiftReg::ShiftBit
+(int8_t  data
+)
+{
+    _ds = data;
+    _sh = 0;
+    _sh = 1;
+}
+
+void 
+ShiftReg::Latch
+(
+)
+{
+  _st = 1;
+  _st = 0;
+}