timer: add Timer class

Timer class consists of systack_handler functionality
with an internal timer for global counter in main()

Timer/src/Timer.cpp

@@ -0,0 +1,64 @@
+/*
+ * Timer.cpp
+ *
+ *  Created on: Oct 14, 2022
+ *      Author: tylen
+ */
+
+#include <Timer.h>
+
+extern "C"
+{
+  void
+  SysTick_Handler (void)
+  {
+    if (timer > 0)
+      timer--;
+  }
+}
+
+Timer::Timer (uint32_t freq = 1000)
+{
+  Chip_Clock_SetSysTickClockDiv (1);
+  uint32_t sysTickRate = Chip_Clock_GetSysTickClockRate ();
+  SysTick_Config (sysTickRate / freq);
+  counter = 0;
+}
+
+Timer::~Timer ()
+{
+  // TODO Auto-generated destructor stub
+}
+
+void
+Timer::tickCounter (int ms)
+{
+  if (counter >= INT_MAX)
+    {
+      counter = 0;
+    }
+  counter++;
+  Sleep (ms);
+}
+
+void
+Timer::Sleep (int ms)
+{
+  timer = ms;
+  while (timer > 0)
+    {
+      __WFI ();
+    }
+}
+
+int
+Timer::getCounter ()
+{
+  return counter;
+}
+
+void
+Timer::resetCounter ()
+{
+  counter = 0;
+}