emulation on host: millis()/micros() now start at 0 (#7810)

emulation on host: millis()/micros() now start at 0

Author: d-a-v

Diff for: tests/host/common/Arduino.cpp

@@ -18,18 +18,24 @@
 
 #include <unistd.h>
 
+static struct timeval gtod0 = { 0, 0 };
+
 extern "C" unsigned long millis()
 {
     timeval time;
     gettimeofday(&time, NULL);
-    return (time.tv_sec * 1000) + (time.tv_usec / 1000);
+    if (gtod0.tv_sec == 0)
+        memcpy(&gtod0, &time, sizeof gtod0);
+    return ((time.tv_sec - gtod0.tv_sec) * 1000) + ((time.tv_usec - gtod0.tv_usec) / 1000);
 }
 
 extern "C" unsigned long micros()
 {
     timeval time;
     gettimeofday(&time, NULL);
-    return (time.tv_sec * 1000000) + time.tv_usec;
+    if (gtod0.tv_sec == 0)
+        memcpy(&gtod0, &time, sizeof gtod0);
+    return ((time.tv_sec - gtod0.tv_sec) * 1000000) + time.tv_usec - gtod0.tv_usec;
 }
 
 

Diff for: tests/host/common/ArduinoMain.cpp

@@ -295,6 +295,9 @@ int main (int argc, char* const argv [])
 	// install exit handler in case Esp.restart() is called
 	atexit(cleanup);
 
+	// first call to millis(): now is millis() and micros() beginning
+	millis();
+
 	setup();
 	while (!user_exit)
 	{