Added HLS Assignments

hls/assignment/sobel/generate_image.py

@@ -0,0 +1,9 @@
+import random
+l = "uint8_t input[512*512] = {\n"
+for i in range((512*512)-1):
+    l += str(random.randint(0,255))
+    l += ",\n"
+l += str(random.randint(0,255))
+l += "};\n"
+
+print(l)

hls/assignment/sobel/main_testbench.cpp

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sobel.h"
+#include "test.h"
+
+uint8_t output[HEIGHT*WIDTH];
+
+int main(int argc, char *argv[]) {
+    int errors = 0;
+
+	sobel(output, input, HEIGHT, WIDTH);
+
+    // Check errors
+    for(int i = 0; i < HEIGHT*WIDTH; i++)
+        if(output[i] != g_output[i])
+           errors++;
+
+    printf("Correctness: %.2f %% (%d Errors)\n", (1.0 - ((float) errors / (float)(HEIGHT*WIDTH)))*100.0, errors);
+
+    return errors;
+}

hls/assignment/sobel/sobel.cpp

@@ -0,0 +1,24 @@
+#include <math.h>
+#include "sobel.h"
+
+void sobel(uint8_t *__restrict__ out, uint8_t *__restrict__ in, int width, int height)
+{
+    int sobelFilter[3][3] = {{-1, 0, 1}, {-2, 0, 2}, {-1, 0, 1}};
+
+    for (int y = 1; y < height - 1; y++)
+    {
+        for (int x = 1; x < width - 1; x++)
+        {
+            int dx = 0, dy = 0;
+            for (int k = 0; k < 3; k++)
+            {
+                for (int z = 0; z < 3; z++)
+                {
+                    dx += sobelFilter[k][z] * in[(y + k - 1) * width + x + z - 1];
+                    dy += sobelFilter[z][k] * in[(y + k - 1) * width + x + z - 1];
+                }
+            }
+            out[y * width + x] = sqrt((float)((dx * dx) + (dy * dy)));
+        }
+    }
+}

hls/assignment/sobel/sobel.h

@@ -0,0 +1,8 @@
+#ifndef SOBEL_H
+#define SOBEL_H
+
+#include <stdint.h>
+
+void sobel(uint8_t *__restrict__ out, uint8_t *__restrict__ in, int width, int height);
+
+#endif