FPGA实现图片翻转旋转

always@(posedge clk_9M or negedge rst)
begin
  if(rst == 1'b0)
    rom_addr <= 'd0;
  else  if(cur_y > 'd150)
    rom_addr <= 'd0;
  else if(active == 1'b1)
    begin
      rom_addr <= rom_addr + 'd100;
    end
  else
    rom_addr <= 'd149-cur_y;
end

always@(posedge clk_9M or negedge rst)
begin
  if(rst == 1'b0)
  rom_addr <= 'd0;
  else  if(cur_y > 'd150)
  rom_addr <= 'd0;
  else if(active == 1'b1)
  begin
    rom_addr <= rom_addr - 'd100;
  end
  else
  rom_addr <= 'd9900 + (cur_y-'d50);
end

always@(posedge clk_9M or negedge rst)
begin
  if(rst == 1'b0)
  rom_addr <= 'd0;
  else  if(cur_y > 'd150)
  rom_addr <= 'd0;
  else if(active == 1'b1)
  begin
    rom_addr <= rom_addr + 1'b1;
  end
  else
  rom_addr <= 100 *(149-cur_y);
end