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+// 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 state = RPI_DigitalIn(pin)
+// Function to read current state on digital pins.
+//
+// Calling Sequence
+// state = RPI_DigitalIn(pin)
+//
+// Parameters
+// pin : pin of RPi to be used
+// state : current state of the pin (0 -> LOW, 1 -> HIGH)
+//
+// Description
+// This fucntion is used for reading the current state on gpio pins of RPi. 'RPI_DigitalSetup' function must be called before this for setting up pin as input. 'pin' must be specified from list given. 'state' specifies the input state (0 -> Low, 1-> High)
+// Examples
+// RPI_DigitalIn(RPI_GPIO_P1_03) //Reads the state of pin 3 of header P1.
+//
+// See also
+// RPI_DigitalSetup RPI_DigitalOut
+//
+//
+// Authors
+// Siddhesh Wani
+//
+// -----------------------------------------------------------------
+//Pins of header P1 which can be used as GPIO
+supported_pins = [3,5,7,8,10,11,12,13,15,16,18,19,21,22,23,24,26,27,28,29,...
+ 31,31,33,35,36,37,38,40];
+
+PinIsGPIO = members(pin, supported_pins); //Check if input pin supports GPIO
+
+//If given pin does not support GPIO functionality, raise the error
+if(PinIsGPIO == 0)
+ error(9999, 'SCI2CERROR: Given pin number doesnot support GPIO functionality.');
+end
+state = 1;
+endfunction