I am working on a task that reads in a some video data and injects it into and axis interface. Maybe I am going about this wrong, but so far I have a for loop that loops through each pixel in the input file. If the downstream module de-asserts tready, I need to pause the loop. Is there someway to pause a for loop? is there a better way to do this, maybe using a while loop? I dont want to break out of the loop because I will loose what index I was at in the loop.
for(int i = 0; i < frame_width*frame_height*num_frames; i++) begin // loop through the number of pixels in the input file
if(s_axis_tready == 1'b1) begin
status = $fscanf(file_handler, "%c%c", frame[i][7:0], frame[i][15:8]);
@(posedge vhdcs_lvds_if.clock) this.vhdcs_lvds_byte_if.data[15:0] = frame[i][15:0];
if (status == 2) begin
s_axis_tvalid = 1'b1;
end
else begin
s_axis_tvalid = 1'b0; // otherwise tvalid should be low
end
//COUNTERS FOR SOF and TLAST GENERATION:
// tuser = SOF = data[16]. This should be high at the start of every frame, i.e. when the row counter and pixel counter are both 0
if(row_count == 0 && pixel_count == 0) begin
s_axis_tuser = 1'b1;
end else begin
s_axis_tuser = 1'b0;
end
// tlast = data[17]. This should be high at the end of every row, i.e. when the pixel counter reaches the width of the frame
if(pixel_count == frame_width-1) begin
s_axis_tlast = 1'b1;
pixel_count = 0; //reset counter after each row
if(row_count == frame_height-1) begin
row_count = 0;
end else begin
row_count = row_count + 1;
end
end else begin
s_axis_tlast = 1'b0;
pixel_count = pixel_count + 1;
end
end
end
