Enable pin for Hls hardware accelerated image processing

[David B]

Hi,

 

I have created an hls ip for sobel on nexys video. It takes the video in via hdmi in port , push it via my ip and then send it out via hdmi out port.

Now, i want to able to control if it display the sobel or display the original image by using a switch. I added a new parameter to top function and an if condition, but i get "ERROR: [XFORM 203-733] An internal stream 'img_6.data_stream[2].V10' (SobelVideoWorking/a.cpp:17) with default
size is used in a non-dataflow region, which may result in deadlock. Please consider to resize the stream using the directive
'set_directive_stream' or the 'HLS stream' pragma.   SobelVideoWorking:solution1  Jan 27, 2019 12:49:03 PM" error.

this is my cpp file:

#include "a.hpp"

void Sobel_filter(AXI_STREAM& INPUT_STREAM, AXI_STREAM& OUTPUT_STREAM, char enable)//, int rows, int cols)
{

#pragma HLS INTERFACE axis port=INPUT_STREAM
#pragma HLS INTERFACE axis port=OUTPUT_STREAM

RGB_IMAGE  img_0(MAX_HEIGHT, MAX_WIDTH);
GRAY_IMAGE img_1(MAX_HEIGHT, MAX_WIDTH);
GRAY_IMAGE  img_2(MAX_HEIGHT, MAX_WIDTH);
GRAY_IMAGE  img_2a(MAX_HEIGHT, MAX_WIDTH);
GRAY_IMAGE  img_2b(MAX_HEIGHT, MAX_WIDTH);
GRAY_IMAGE  img_3(MAX_HEIGHT, MAX_WIDTH);
GRAY_IMAGE  img_4(MAX_HEIGHT, MAX_WIDTH);
GRAY_IMAGE  img_5(MAX_HEIGHT, MAX_WIDTH);
RGB_IMAGE  img_6(MAX_HEIGHT, MAX_WIDTH);
;

#pragma HLS dataflow
hls::AXIvideo2Mat(INPUT_STREAM, img_0);


if(0 == enable)
{
	hls::Mat2AXIvideo(img_0, OUTPUT_STREAM);
} else {
	hls::CvtColor<HLS_BGR2GRAY>(img_0, img_1);
	hls::GaussianBlur<3,3>(img_1,img_2);
	hls::Duplicate(img_2,img_2a,img_2b);
	hls::Sobel<1,0,3>(img_2a, img_3);
	hls::Sobel<0,1,3>(img_2b, img_4);
	hls::AddWeighted(img_4,0.5,img_3,0.5,0.0,img_5);
	hls::CvtColor<HLS_GRAY2RGB>(img_5, img_6);
	hls::Mat2AXIvideo(img_6, OUTPUT_STREAM);
}
}

 and this is the header:

#include  "hls_video.h"
#include <ap_fixed.h>

#define MAX_WIDTH  1280
#define MAX_HEIGHT 720


typedef hls::stream<ap_axiu<24,1,1,1> >           AXI_STREAM;
typedef hls::Mat<MAX_HEIGHT,   MAX_WIDTH,   HLS_8UC3> RGB_IMAGE;
typedef hls::Mat<MAX_HEIGHT,   MAX_WIDTH,   HLS_8UC1> GRAY_IMAGE;


void Sobel_filter(AXI_STREAM& INPUT_STREAM, AXI_STREAM& OUTPUT_STREAM);//int rows, int cols);

I haven't found any solution to the problem. 

 

Thank you!

 

 

[jpeyron]

Hi @David B,

I do not have much experience with HSL. It looks like the Xilinx forums has been working on this issue as well here.

1) At this point I would suggest simulation. Here is a PDF that looks to be helpful for simulating HLS projects.

2) I would also suggest finding other HLS projects that use an enable switch as see how they accomplished the task.

thank you,

Jon