C to hardware acceleration

Hello Everyone

I am doing hardware acceleration for edge detection( sobel). I have created custom component to transfer 8 values for sobel kernel and i will get result pixel value. Here I am attaching both my verilog code for custom component and C code for nios. Question is I am not getting proper output . Everytime I am getting only Zero. Can anyone guide me where I am doing mistake. The array of an image is just random numbers.

Thanks