# HG changeset patch
# User David Douard <david.douard@sdf3.org>
# Date 1603660535 -3600
# Node ID 167010858b8db9c798b7fdca9dea8d10c0264a41
# Parent  bc1d6ecbb0cc91453903da4d4a16beffacaaf0dc
Reformat Keypad.cpp

diff -r bc1d6ecbb0cc -r 167010858b8d lib/keypad/Keypad.cpp
--- a/lib/keypad/Keypad.cpp	Sun Oct 25 22:15:03 2020 +0100
+++ b/lib/keypad/Keypad.cpp	Sun Oct 25 22:15:35 2020 +0100
@@ -1,95 +1,96 @@
-#include "mbed.h"
-#include "Keypad.h"
-
-
-Keypad::Keypad(
-    uint8_t nRows,
-    DigitalIn rows[],
-    uint8_t nColumns,
-    DigitalOut cols[],
-    int debounce_ms):
-  _rows(),
-  _columns(),
-  _debounce(debounce_ms),
-  _started(false),
-  _nrows(nRows),
-  _ncols(nColumns)
-{
-  printf("Setup Keypad: %dx%d\r\n", nColumns, nRows);
-  for(uint8_t c=0; c<nColumns; c++)
-	{
-    _columns.push_back(cols[c]);
-    _columns[c].write(0);
-  }
-
-  for(uint8_t r=0; r<nRows; r++)
-	{
-    _rows.push_back(rows[r]);
-    _rows[r].mode(PullDown);
-  }
-  _keys = new uint8_t[_nrows*_ncols];
-}
-
-Keypad::~Keypad()
-{
-  delete _keys;
-}
-
-void Keypad::run()
-{
-  uint8_t col=0;
-  uint8_t row;
-
-  for (row=0; row<(_ncols*_nrows); row++)
-    _keys[row] = 0;
-
-  while(_started)
-  {
-    _columns[col].write(1);
-    ThisThread::sleep_for(5);
-    for(row=0; row<_nrows; row++)
-    {
-      if (_rows[row].read())
-      {
-        if (_keys[row + _nrows*col] < 2)
-        {
-          _keys[row + _nrows*col]++;
-          if ((_keys[row + _nrows*col] == 2) && _kp_callback)
-            _kp_callback.call(row, col);
-        }
-      }
-      else
-      {
-        if (_keys[row + _nrows*col] > 0)
-        {
-          _keys[row + _nrows*col]--;
-          if ((_keys[row + _nrows*col] == 0) && _kr_callback)
-            _kr_callback.call(row, col);
-        }
-      }
-      }
-    _columns[col].write(0);
-    col = (col+1) % _ncols;
-    ThisThread::sleep_for(5);
-  }
-}
-
-void Keypad::attach(const keyevent_callback_t& kp_callback,
-					const keyevent_callback_t& kr_callback)
-{
-  _kp_callback = kp_callback;
-  _kr_callback = kr_callback;
-}
-
-void Keypad::start(void)
-{
-if (_started)
-  return;
-_started = true;
-_loop.start(callback(this, &Keypad::run));
-}
-
-void Keypad::stop(void)
-{
-  _started = false;
-}
+#include "mbed.h"
+#include "Keypad.h"
+
+
+Keypad::Keypad(
+    uint8_t nRows,
+    DigitalIn rows[],
+    uint8_t nColumns,
+    DigitalOut cols[],
+    int debounce_ms):
+  _rows(),
+  _columns(),
+  _debounce(debounce_ms),
+  _started(false),
+  _nrows(nRows),
+  _ncols(nColumns)
+{
+  printf("Setup Keypad: %dx%d\r\n", nColumns, nRows);
+  for(uint8_t c=0; c<nColumns; c++)
+	{
+    _columns.push_back(cols[c]);
+    _columns[c].write(0);
+  }
+
+  for(uint8_t r=0; r<nRows; r++)
+	{
+    _rows.push_back(rows[r]);
+    _rows[r].mode(PullDown);
+  }
+  _keys = new uint8_t[_nrows*_ncols];
+}
+
+Keypad::~Keypad()
+{
+  delete _keys;
+}
+
+void Keypad::run()
+{
+  uint8_t col=0;
+  uint8_t row;
+
+  for (row=0; row<(_ncols*_nrows); row++)
+    _keys[row] = 0;
+
+  while(_started)
+  {
+	// activate column col
+    _columns[col].write(1);
+    ThisThread::sleep_for(5);
+    for(row=0; row<_nrows; row++)
+    {
+      if (_rows[row].read())
+      {
+		if (_keys[row + _nrows*col] < 2)  // ensure only one key is pressed in this column
+        {
+          _keys[row + _nrows*col]++;
+          if ((_keys[row + _nrows*col] == 2) && _kp_callback)
+            _kp_callback.call(row, col);
+        }
+      }
+      else
+      {
+        if (_keys[row + _nrows*col] > 0)
+        {
+          _keys[row + _nrows*col]--;
+          if ((_keys[row + _nrows*col] == 0) && _kr_callback)
+            _kr_callback.call(row, col);
+        }
+      }
+      }
+    _columns[col].write(0);
+    col = (col+1) % _ncols;
+    ThisThread::sleep_for(5);
+  }
+}
+
+void Keypad::attach(const keyevent_callback_t& kp_callback,
+					const keyevent_callback_t& kr_callback)
+{
+  _kp_callback = kp_callback;
+  _kr_callback = kr_callback;
+}
+
+void Keypad::start(void)
+{
+  if (_started)
+    return;
+  _started = true;
+  _loop.start(callback(this, &Keypad::run));
+}
+
+void Keypad::stop(void)
+{
+  _started = false;
+}