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diff --git a/macros/Hardware/RasberryPi/mcp/RPI_mcp23s17Setup.sci b/macros/Hardware/RasberryPi/mcp/RPI_mcp23s17Setup.sci
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+// Copyright (C) 2017 - IIT Bombay - FOSSEE
+//
+// This file must be used under the terms of the CeCILL.
+// This source file is licensed as described in the file COPYING, which
+// you should have received as part of this distribution.  The terms
+// are also available at
+// http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+// Organization: FOSSEE, IIT Bombay
+// Email: toolbox@scilab.in
+
+function out=RPI_mcp23s17Setup(pinBase,spiPort,devId)
+// Function for setting up 16-bit MCP23s17 SPI GPIO expansion chip.
+//
+// Calling Sequence
+//  RPI_mcp23s17Setup(pinBase,spiPort,devId)
+//
+// Parameters
+//  pinBase: any number above 64. The consecutive 16 pins will be allocated alongwith.
+//  spiPort: 0 or 1 for one of the two SPI ports on the Raspberry Pi.
+//  devId  : the ID of the MCP23s17 on the SPI port.
+//
+// Description
+//  This function setups the extension module for the 16-bit MCP23s17 SPI GPIO expansion chip.
+//
+// Examples
+//  RPI_mcp23s17Setup(67,0,0)
+// See also
+//  RPI_sr595Setup, RPI_pcf8574Setup, RPI_pcf8591Setup, RPI_mcp23008Setup, RPI_mcp23016Setup, RPI_mcp23017Setup, RPI_mcp23s08Setup
+//
+// Authors
+//  Jorawar Singh
+//
+// Bibliography
+//  http://wiringpi.com/reference/
+
+    commande="ms7#3#"+string(pinBase)+"#"+string(spiPort)+"#"+string(devId)+"#";
+    if getos()=="Linux" then
+        out=unix_g("python -c ""import socket;s=socket.socket();s.connect((''"+RPI_piAdress+"'',9077));s.send(''"+commande+"'');print(s.recv(1024));s.close()""");
+    elseif getos()=="Windows" then
+        [out,RPI_winR]=dos("python -c ""import socket;s=socket.socket();s.connect((''"+RPI_piAdress+"'',9077));s.send(''"+commande+"'');print(s.recv(1024));s.close()""");
+    end
+endfunction