Diff: Keypad.cpp

Revision:

10:da060f8c03e8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Keypad.cpp	Wed Jan 01 17:45:53 2014 +0000
@@ -0,0 +1,157 @@
+#include "Keypad.h"
+
+extern Serial PC;
+
+void Keypad::_cbRow0Rise()
+{
+    _checkIndex(0, _rows[0]);
+}
+
+void Keypad::_cbRow1Rise()
+{
+    _checkIndex(1, _rows[1]);
+}
+
+void Keypad::_cbRow2Rise()
+{
+    _checkIndex(2, _rows[2]);
+}
+
+void Keypad::_cbRow3Rise()
+{
+    _checkIndex(3, _rows[3]);
+}
+
+void
+Keypad::_setupRiseTrigger
+(
+)
+{
+    if (_rows[0]) {
+        _rows[0]->rise(this, &Keypad::_cbRow0Rise);
+    }
+
+    if (_rows[1]) {
+        _rows[1]->rise(this, &Keypad::_cbRow1Rise);
+    }
+
+    if (_rows[2]) {
+        _rows[2]->rise(this, &Keypad::_cbRow2Rise);
+    }
+
+    if (_rows[3]) {
+        _rows[3]->rise(this, &Keypad::_cbRow3Rise);
+    }
+}
+
+
+Keypad::Keypad
+(PinName      r0
+,PinName      r1
+,PinName      r2
+,PinName      r3
+,PinName      c0
+,PinName      c1
+,PinName      c2
+,PinName      c3
+,int          debounce_ms
+)
+{
+    PinName rPins[4] = {r0, r1, r2, r3};
+    PinName cPins[4] = {c0, c1, c2, c3};
+
+    for (int i = 0; i < 4; i++) {
+        _rows[i] = NULL;
+        _cols[i] = NULL;
+    }
+    
+    _nRow = 0;
+    for (int i = 0; i < 4; i++) {
+        if (rPins[i] != NC) {
+            _rows[i] = new InterruptIn(rPins[i]);
+            _nRow++;
+        } else
+            break;
+    }
+    _setupRiseTrigger();
+    
+    _nCol = 0;
+    for (int i = 0; i < 4; i++) {
+        if (cPins[i] != NC) {
+            _cols[i] = new DigitalOut(cPins[i]);
+            _nCol++;
+        } else
+            break;
+    }
+
+    _debounce = debounce_ms; 
+}
+
+Keypad::~Keypad
+()
+{
+    for (int i = 0; i < 4; i++) {
+        if (_rows[i] != 0)
+            delete _rows[i];
+    }
+
+    for (int i = 0; i < 4; i++) {
+        if (_cols[i] != 0)
+            delete _cols[i];
+    }
+}
+
+void
+Keypad::start
+(
+)
+{
+    for (int i = 0; i < _nCol; i++)
+        _cols[i]->write(1);
+}
+
+void
+Keypad::stop
+(
+)
+{
+    for (int i = 0; i < _nCol; i++)
+        _cols[i++]->write(0);
+}
+
+void
+Keypad::attach
+(uint32_t     (*fptr)(uint32_t index)
+)
+{
+    _callback.attach(fptr);
+}
+
+void
+Keypad::_checkIndex
+(int          row
+,InterruptIn *therow
+)
+{
+#ifdef THREAD_H
+    Thread::wait(_debounce);
+#else
+    wait_ms(_debounce);
+#endif
+
+    if (therow->read() == 0)
+        return;
+
+    int c;
+    for (c = 0; c < _nCol; c++) {
+        _cols[c]->write(0); // de-energize the column
+        if (therow->read() == 0) {
+            break;
+        }
+    }
+    
+    int index = row * _nCol + c;
+    _callback.call(index);
+    start(); // Re-energize all columns
+}
+