First draft HMC5883 magnetometer sensor using physical quantities, outputting via serial port using std::cout on mbed os 5

Revision:
10:75c8ce89aeb7
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/loop_forever.cpp	Thu Mar 26 21:59:18 2020 +0000
@@ -0,0 +1,18 @@
+
+#include "mbed.h"
+#include <iostream>
+
+// terminal loop, printing message periodically
+void loop_forever(std::string const & str)
+{
+    DigitalOut led1(LED1,1);
+    // stop but print error dynamically
+    int count = 0;
+    for (;;) {
+        led1 = 1;
+        std::cout << str << " " << count++ << '\n';
+        ThisThread::sleep_for(200U);
+        led1 = 0;
+        ThisThread::sleep_for(800U);
+    }
+}
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