Merge pull request #618 from marceloaqno/dev-rpi-signing

RPi: Add support for signing messages

drivers/Linux/Arduino.h

@@ -71,6 +71,7 @@ typedef string String;
 
 void yield(void);
 unsigned long millis(void);
+unsigned long micros(void);
 void _delay_ms(unsigned int millis);
 void randomSeed(unsigned long seed);
 long randMax(long howbig);

drivers/Linux/compatibility.cpp

@@ -21,6 +21,19 @@ unsigned long millis(void)
 	return ((curTime.tv_sec - millis_at_start) * 1000) + (curTime.tv_usec / 1000);
 }
 
+unsigned long micros()
+{
+  timeval curTime;
+
+  if (millis_at_start == 0) {
+    gettimeofday(&curTime, NULL);
+    millis_at_start = curTime.tv_sec;
+  }
+
+  gettimeofday(&curTime, NULL);
+  return ((curTime.tv_sec - millis_at_start) * 1000000) + (curTime.tv_usec);
+}
+
 void _delay_ms(unsigned int millis)
 {
     struct timespec sleeper;