diff -r b3c3d54d2c7c -r 2da50a3d4e9f lib/unigraphic/SSD1322.h
--- a/lib/unigraphic/SSD1322.h	Sun Nov 01 22:21:19 2020 +0100
+++ b/lib/unigraphic/SSD1322.h	Sat Nov 07 19:20:39 2020 +0100
@@ -231,7 +231,7 @@
     int win_y1;
     int win_y2;
     int orientation;
-
+	Mutex pixel_buffer_mutex;  // used when being copied to the transerf buffer
     SSD1322_state_t _state;
 #ifdef DEVICE_SPI_ASYNCH
     event_callback_t _spiEventCb;