ADAFRUIT GP9002 VFD Driver supporting grayscale display, requires GFX-Library Note no "invert" function, also fixed timing issue in "begin"

Dependencies:   bitreversetable256

Dependents:   GP9002af_gray

Fork of Adafruit-GP9002-Graphic-VFD-Library by Oliver Broad

Revision:
0:e760d4cfabe4
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+This is a library for our Monochrome 128x64 Graphical VFD
+
+  Pick one up today in the adafruit shop!
+  ------> http://www.adafruit.com/products/773
+
+These displays use SPI to communicate, 5 pins are required to  
+interface
+
+Adafruit invests time and resources providing this open source code, 
+please support Adafruit and open-source hardware by purchasing 
+products from Adafruit!
+
+Written by Limor Fried/Ladyada  for Adafruit Industries.  
+BSD license, check license.txt for more information
+All text above must be included in any redistribution
+
+To download. click the DOWNLOADS button in the top right corner, rename the uncompressed folder Adafruit_GP9002. Check that the Adafruit_GP9002 folder contains Adafruit_GP9002.cpp and Adafruit_GP9002.h
+
+Place the Adafruit_GP9002 library folder your <arduinosketchfolder>/libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the IDE.
+
+You will also have to download the Adafruit GFX Graphics core which does all the circles, text, rectangles, etc. You can get it from
+https://github.com/adafruit/Adafruit-GFX-Library
+and download/install that library as well 
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