Merge branch 'user_screen_access'

Add function to get a pointer to the start of the RAM screen buffer
for direct write and read access.

MicroView.cpp

@@ -1340,6 +1340,14 @@ int MicroView::readSerial(void)
 	return i;
 }
 
+/** \brief Get pointer to screen buffer
+
+	Return a pointer to the start of the RAM screen buffer for direct access.
+*/
+uint8_t *MicroView::screenBuffer(void) {
+	return screenmemory;
+}
+
 // -------------------------------------------------------------------------------------
 // MicroViewWidget Class - start
 // -------------------------------------------------------------------------------------

MicroView.h

@@ -192,6 +192,7 @@ public:
 	uint8_t getLCDHeight(void);
 	void setColor(uint8_t color);
 	void setDrawMode(uint8_t mode);
+	uint8_t *screenBuffer(void);
 
 	// Font functions
 	uint8_t getFontWidth(void);