Merged Ashish's work

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diff --git a/macros/Hardware/AVR/AVRPWM0Setup.sci b/macros/Hardware/AVR/AVRPWM0Setup.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 AVRPWM0Setup(waveform_mode,output_mode)
+//Function to Setup OC0 pin for required PWM mode
+//Description
+//	Every Micro controller has PWM pins which can generate varying voltages
+//	from 0V-5V.This function helps to use OC0 pin to produce required 
+//	output waveform by setting the waveform mode and otput mode.
+//
+//Parameters
+//	waveform_mode:
+//                   0 for Phase correct PWM Mode
+//                   1 for Fast PWM Mode 
+//                   2 for CTC Mode
+//      output_mode:
+//            For Phase Correct PWM Mode:
+//                   0 for Clear OC0 on compare match when up-counting. Set OC0 on compare
+//                   match when down-counting.
+//                   1 for Set OC0 on compare match when up-counting. Clear OC0 on compare
+//                   match when down-counting.
+// 
+//            For Fast PWM Mode:
+//                   0 for non-inverted output i.e Clear OC0 on compare match, set OC0 at BOTTOM.
+//                   1 for inverted output i.e Set OC0 on compare match, clear OC0 at BOTTOM.
+//        
+//            For CTC Mode:
+//                   0 to Clear OC0 on compare match
+//                   1 to Set OC0 on compare match
+//                   2 to toggle OC0 on compare match
+//    
+//Example
+//    AVRPWM0Setup(2,0);     //This function will select CTC waveform mode and will clear OC0 on    
+//                           compare match 
+//See also
+//     AVRPWM0SetDuty
+//
+//Authors
+//     Ashish Kamble
+//
+//This is curretly dummy function. It provides no functionality but is required 
+//for providing support for generating C code for AVR.
+
+if(waveform_mode>=3) then 
+disp("Error : Invalid input argument ''waveform_mode'' in AVRPWM0Setup function.");
+end
+ 
+if((waveform_mode==0)|(waveform_mode==1)) then
+ if(output_mode>=2) then 
+ disp("Error : Invalid input argument ''output_mode'' in AVRPWM0Setup function.");
+ end
+end
+
+
+if(waveform_mode==2) then
+ if(output_mode>=3) then 
+ disp("Error : Invalid input argument ''output_mode'' in AVRPWM0Setup function.");
+ end
+end
+
+endfunction