Migrate serial

libs/microbit/serial.cpp

@@ -0,0 +1,38 @@
+#include "ksbit.h"
+
+//% weight=2 color=30
+namespace serial {
+    // note that at least one // followed by % is needed per declaration!
+    
+    /**
+     * Reads a line of text from the serial port.
+     */
+    //%
+    StringData* readString() {
+      return uBit.serial.readString().leakData();
+    }
+
+    /**
+     * Sends a piece of text through Serial connection.
+     */
+    //%
+    void writeString(StringData *text) { 
+      uBit.serial.sendString(ManagedString(text));
+    }
+
+    /**
+     * Sends the current pixel values, byte-per-pixel, over serial.
+     */
+    //%
+    void writeScreen() {
+        uBit.serial.sendDisplayState(); 
+    }
+
+    /**
+     * Reads the screen from serial.
+     */
+    //%
+    void readScreen() { 
+        uBit.serial.readDisplayState();
+    }
+}