I use AXI streaming in the Sobel filter implementation, but I got stuck at the dma.recvchannel.wait(). And I need some suggestions to help me debug. My board is PYNQ-Z2, and input data is grayscale image in 1080x1920
My C++ code in HLS:
void video_2dfilter(wide_stream* input_stream, wide_stream* output_stream) {
#pragma HLS INTERFACE axis depth=20000 port=input_stream bundle=INPUT_STREAM
#pragma HLS INTERFACE axis port=output_stream bundle=OUTPUT_STREAM
#pragma HLS INTERFACE s_axilite port=return bundle=CONTROL_BUS
uint8_t window[3][3];
uint8_t line_buffer[2][MAX_WIDTH];
#pragma HLS ARRAY_PARTITION variable=line_buffer complete dim=1
int8_t filter_horizontal[3][3] = {{-1,-2,-1},{0,0,0},{1,2,1}};
int8_t filter_vertical[3][3] = {{-1,0,1},{-2,0,2},{-1,0,1}};
row_loop: for (int row = 0; row < MAX_HEIGHT; row++) {
col_loop: for (int col = 0; col < MAX_WIDTH; col++) {
#pragma HLS pipeline
for (int i = 0; i < 3 ; i++){
window[i][0] = window[i][1];
window[i][1] = window[i][2];
}
window[0][2] = (line_buffer[0][col]);
window[1][2] = (line_buffer[0][col] = line_buffer[1][col]);
window[2][2] = (line_buffer[1][col] = input_stream->data);
++input_stream;
// handle boundary
if (row == 0 || col == 0 || row == (MAX_WIDTH - 1) || col == (MAX_WIDTH - 1)) {
output_stream->data = 0;
} else{
output_stream->data = ABS(filter(window, filter_horizontal)) + ABS(filter(window, filter_vertical));
}
// streaming attr setup
output_stream->user = (row == 0 && col == 0)? 1: 0;
output_stream->last = (row == MAX_HEIGHT-1 && col == MAX_WIDTH-1)? 1: 0;
++output_stream;
}
}
}
My Block Design and DMA configurations, where I add AXI Stream Interconnection to control dataflow route to various convolution kernels I will include in the future.
My Python code on Jupyternotebook:
