May 4 – 5, 2013

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GR Framework / MODBUS on Raspberry Pi

PythonCamp 2013 Cologne | Josef Heinen

May 4 – 5, 2013 2 Josef Heinen, Forschungszentrum Jülich, Peter Grünberg Institute, Scientific IT Systems

Part I: GR Framework on Raspberry Pi GR basic functionality Ø  lines, marker symbols, filled polygons and text with

corresponding attributes and transformations, cell arrays Ø  axes, grids, spline curves, error bars, surfaces, contours,

geometric forms, arrows, raster images, LaTeX equations Ø  device and platform independent output thru logical device

drivers or plugins Ø  import, export and printing of graphics Ø  interoperability with Qt and wxWidgets toolkits Ø  GR ctypes wrapper

May 4 – 5, 2013 3 Josef Heinen, Forschungszentrum Jülich, Peter Grünberg Institute, Scientific IT Systems

GR – layer structure

Fortran"

C / C++" …"IPython / PyPy!

GR!

C / C++ / clang"Pascal"

Graphics Kernel System (GKS)!

Win32"X11"

GLGr!

OpenGL (ES)!Apple iOS!

GKSTerm"

Java"

gksweb"

Qt" Quartz" SVG"PS" PDF" …"

logical device drivers / plugins:"– CGM, GKSM, GIF, RF, UIL"– WMF, Xfig"– GS (BMP, JPEG, PNG, TIFF) "

gksqt"

May 4 – 5, 2013 4 Josef Heinen, Forschungszentrum Jülich, Peter Grünberg Institute, Scientific IT Systems

GR – interfaces

GKS logical device drivers!

Win32"X11"

C / Objective-C!

GKSTerm"gksqt"

Qt / wx event loop"

Java"

gksweb"

SVG"

OpenGL! ES!

glgr / iGR App!

GR!

GKS!

Qt" Quartz" PS" PDF" …"

socket communication"

PyQt4 / wxPython "

IPython"

May 4 – 5, 2013 5 Josef Heinen, Forschungszentrum Jülich, Peter Grünberg Institute, Scientific IT Systems

GR3 features Ø  scenes: meshes, spheres, cylinders, cones Ø  properties: color, background, camera, light sources Ø  export to GR (off-screen rendering), POV-Ray, HTML5

canvas Ø  GR3 ctypes wrapper

May 4 – 5, 2013 6 Josef Heinen, Forschungszentrum Jülich, Peter Grünberg Institute, Scientific IT Systems

GR3 – layer structure

C / C++"

GKS!

GR! GR3!

OpenGL (WGL / CGL / GLX)"

POV-Ray!

POV-Raygeneration"

off-screen rendering"

direct rendering"

Browser!

JavaScriptgeneration"

WebGL"

GLUT" Qt4"

..."..."

IPython / PyPy!

May 4 – 5, 2013 7 Josef Heinen, Forschungszentrum Jülich, Peter Grünberg Institute, Scientific IT Systems

Installation (Raspbian "wheezy“)

sudo apt-get install libx11-dev !sudo apt-get install libxft-dev!sudo apt-get install libxt-dev!sudo apt-get install python2.7-dev!sudo apt-get install libgl1-mesa-dev !sudo apt-get install libgs-dev!sudo apt-get install texlive-latex3!sudo apt-get install dvipng!sudo apt-get install qt4-dev-tools!sudo apt-get install pyqt4-dev-tools!sudo apt-get install libwxgtk2.8-dev!sudo apt-get install python-wxgtk2.8!sudo apt-get install python-imaging!sudo apt-get install python-pyaudio!sudo apt-get install python-opengl!!git clone git://ifflinux.iff.kfa-juelich.de/gr!cd gr!export QTDIR=/usr/share/qt4!make; make install; make clean!cd examples ...!

May 4 – 5, 2013 8 Josef Heinen, Forschungszentrum Jülich, Peter Grünberg Institute, Scientific IT Systems

Raspberry Pi in action …

May 4 – 5, 2013 9 Josef Heinen, Forschungszentrum Jülich, Peter Grünberg Institute, Scientific IT Systems

Part II: Raspberry Pi + MODBUS MODBUS functionality Ø  MODBUS TCP – a MB variant used for communications

over TCP/IP networks (port 502) Ø  communication protocol for connecting industrial electronic

devices Ø  Read/Write functions for discrete inputs / internal bits or

physical coils Ø  Read/Write functions for physical input or output registers

(DI, DO, AI, AO) Ø  Pure-Python wrapper

May 4 – 5, 2013 10 Josef Heinen, Forschungszentrum Jülich, Peter Grünberg Institute, Scientific IT Systems

MODBUS Test Scenario

May 4 – 5, 2013 11 Josef Heinen, Forschungszentrum Jülich, Peter Grünberg Institute, Scientific IT Systems

MODBUS Station Graph (for Test Scenario)

May 4 – 5, 2013 12 Josef Heinen, Forschungszentrum Jülich, Peter Grünberg Institute, Scientific IT Systems

Demonstration

May 4 – 5, 2013 13 Josef Heinen, Forschungszentrum Jülich, Peter Grünberg Institute, Scientific IT Systems

GR information

Ø  https://iffwww.iff.kfa-juelich.de/portal/doku.php?id=gr Ø  Repository: git://ifflinux.iff.kfa-juelich.de/gr Ø  Co-Authors: Florian Rhiem, Ingo Heimbach, Christian

Felder, et. al.