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EXAMPLES/EX08_DREG_SHIFTING.hpp

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+#include <scamp5.hpp>
+
+#include "MISC/MISC_FUNCS.hpp"
+using namespace SCAMP5_PE;
+
+vs_stopwatch frame_timer;
+vs_stopwatch output_timer;
+vs_stopwatch areg_shift_timer;
+
+int main()
+{
+    vs_init();
+
+    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    //SETUP IMAGE DISPLAYS
+
+		int disp_size = 2;
+		auto display_00 = vs_gui_add_display("Captured Image",0,0,disp_size);
+		auto display_01 = vs_gui_add_display("Binary Thresholded Image",0,disp_size,disp_size);
+		auto display_02 = vs_gui_add_display("Shifted Binary Thresholded Image",0,disp_size*2,disp_size);
+
+    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    //SETUP GUI ELEMENTS & CONTROLLABLE VARIABLES
+
+		int threshold_value = 64;
+		vs_gui_add_slider("threshold_value",-127,127,threshold_value,&threshold_value);
+
+		//for controlling the shift applied to the DREG content
+	    int shift_x = 40;
+	    vs_gui_add_slider("shift_x",-255,255,shift_x,&shift_x);
+	    int shift_y = 40;
+	    vs_gui_add_slider("shift_y",-255,255,shift_y,&shift_y);
+
+		//for toggling between using "DNEWS0" or "DNEWS1"
+		int use_DNEWS1 = 0;
+		vs_gui_add_switch("use_DNEWS1",1,&use_DNEWS1);
+
+		int output_just_shifted_img = 0;
+		vs_gui_add_switch("output_just_shifted_img",output_just_shifted_img == 1,&output_just_shifted_img);
+
+    //CONTINOUS FRAME LOOP
+    while(true)
+    {
+        frame_timer.reset();//reset frame_timer
+
+    	vs_disable_frame_trigger();
+        vs_frame_loop_control();
+
+        //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+        //CAPTURE FRAME AND PERFORM THRESHOLDING
+
+          	//load threshold value into C across all PEs
+  			scamp5_in(C,threshold_value);
+  			scamp5_kernel_begin();
+  				get_image(A,F);	//A = pixel data of latest frame, F = intermediate result
+
+  				sub(F,A,C); //C = (A - C) == (latest frame pixel - threshold)
+
+  				where(F);//sets FLAG = 1 in PEs where F > 0 (i.e. where A > C), else FLAG = 0
+
+  					MOV(S0,FLAG);//copy FLAG into S0, will be performed on all PEs as FLAG does not effect Digital instruction execution, only analogue
+  					MOV(S1,FLAG);
+  				all();//Resets FLAG = 1 across all PEs
+  			scamp5_kernel_end();
+
+		//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+		//shift content of S1 using DNEWS
+
+  			areg_shift_timer.reset();
+
+  			//First shift horizontally
+  			{
+				scamp5_kernel_begin();
+					CLR(RN,RS,RE,RW);//Clear all DREG controlling DNEWS behaviour
+				scamp5_kernel_end();
+
+				//set the appropriate DREG to shift horizontally left or right
+				if(shift_x > 0)
+				{
+					scamp5_kernel_begin();
+						SET(RW);
+					scamp5_kernel_end();
+				}
+				else
+				{
+					scamp5_kernel_begin();
+						SET(RE);
+					scamp5_kernel_end();
+				}
+
+				//Now after setting up the RN,RS,RE,RW correctly, shift the content of S1 horizontally by repeatedly performing DNEWS operations
+				int iteration = abs(shift_x);
+				if(!use_DNEWS1)
+				{
+					for(int n = 0 ; n < iteration ; n++)
+					{
+						scamp5_kernel_begin();
+							DNEWS0(S6,S1);//S6 = DNEWS(S0)
+							MOV(S1,S6);//Copy the results in S6 back into S0
+						scamp5_kernel_end();
+					}
+				}
+				else
+				{
+					for(int n = 0 ; n < iteration ; n++)
+					{
+						scamp5_kernel_begin();
+							DNEWS1(S6,S1);
+							MOV(S1,S6);
+						scamp5_kernel_end();
+					}
+				}
+  			}
+
+  			//Now also shift vertically
+  			{
+				scamp5_kernel_begin();
+					CLR(RN,RS,RE,RW);//Clear all DREG controlling DNEWS behaviour
+				scamp5_kernel_end();
+
+				//set the appropriate DREG to shift vertically up or down
+				if(shift_y > 0)
+				{
+					scamp5_kernel_begin();
+						SET(RN);
+					scamp5_kernel_end();
+				}
+				else
+				{
+					scamp5_kernel_begin();
+						SET(RS);
+					scamp5_kernel_end();
+				}
+
+				//Now after setting up the RN,RS,RE,RW correctly, shift the content of S1 vertically by repeatedly performing DNEWS operations
+				int iteration = abs(shift_y);
+				if(!use_DNEWS1)
+				{
+					for(int n = 0 ; n < iteration ; n++)
+					{
+						scamp5_kernel_begin();
+							DNEWS0(S6,S1);
+							MOV(S1,S6);
+						scamp5_kernel_end();
+					}
+				}
+				else
+				{
+					for(int n = 0 ; n < iteration ; n++)
+					{
+						scamp5_kernel_begin();
+							DNEWS1(S6,S1);
+							MOV(S1,S6);
+						scamp5_kernel_end();
+					}
+				}
+  			}
+
+  			int time_spent_shifting = areg_shift_timer.get_usec();
+
+
+        //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+		//OUTPUT IMAGES
+
+			output_timer.reset();
+			if(!output_just_shifted_img)
+			{
+				output_4bit_image_via_DNEWS(A,display_00);//output AREG quickly using 4bit approximation
+				scamp5_output_image(S0,display_01);//display thresholded image
+			}
+			scamp5_output_image(S1,display_02);//displayed shifted thresholded image
+			int output_time_microseconds = output_timer.get_usec();//get the time taken for image output
+
+	    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+		//OUTPUT TEXT INFO
+
+			int frame_time_microseconds = frame_timer.get_usec(); //get the time taken this frame
+			int max_possible_frame_rate = 1000000/frame_time_microseconds; //calculate the possible max FPS
+			int image_output_time_percentage = (output_time_microseconds*100)/frame_time_microseconds; //calculate the % of frame time which is used for image output
+			vs_post_text("time spent shifting %d \n",time_spent_shifting);
+			vs_post_text("frame time %d microseconds(%%%d image output), potential FPS ~%d \n",frame_time_microseconds,image_output_time_percentage,max_possible_frame_rate); //display this values on host
+    }
+    return 0;
+}