feat: double buffering
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df30572711
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a9a1797236
1 changed files with 47 additions and 62 deletions
101
vhdl/splink.vhdl
101
vhdl/splink.vhdl
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@ -29,25 +29,16 @@ architecture a of splink is
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constant BITS_PER_LED: natural := 24;
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signal led_addr : std_logic_vector(7 downto 0);
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signal led_data : std_logic_vector(BITS_PER_LED * NUM_STRANDS - 1 downto 0);
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signal led_colors : colors_vector(NUM_STRANDS-1 downto 0);
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type led_data_t is record
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was_written : std_logic;
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end record;
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type led_data_arr_t is array(0 to NUM_STRANDS-1) of led_data_t;
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signal led_data_arr : led_data_arr_t;
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signal active_strand: natural range 0 to NUM_STRANDS-1;
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signal num_pixels: natural range 1 to MAX_STRAND_LEN;
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signal current_frame: unsigned(31 downto 0);
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signal pixels_received: natural range 0 to MAX_STRAND_LEN-1;
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signal run : std_logic;
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signal clear_write_flags : std_logic;
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signal all_strands_written : std_logic;
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signal some_strands_written : std_logic;
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signal sender_done : std_logic;
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-- "PIXL"
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constant MAGIC_NUMBER : std_logic_vector(31 downto 0) := x"5049584c";
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@ -57,6 +48,9 @@ architecture a of splink is
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type receive_state_t is (MAGIC, FRAME_NUM, STRAND_NUM, DATA, DROP);
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constant RESET_STATE : receive_state_t := MAGIC;
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signal receive_state : receive_state_t;
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type bank_t is (BANK_A, BANK_B);
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signal output_bank : bank_t;
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begin
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ws2812_inst: entity work.ws2812_parallel
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generic map (
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@ -70,12 +64,13 @@ begin
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T1H => 0.7 us,
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T1L => 0.55 us,
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T_RES => 80 us
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T_RES => 100 us
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)
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port map (
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n_reset => not reset,
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clk => clk,
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run => run,
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done => sender_done,
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led_addr => led_addr,
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@ -84,61 +79,49 @@ begin
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dout => drivers
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);
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driver_gen: for i in 0 to NUM_STRANDS-1 generate
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writer: process(clk)
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type strand_store_t is array(0 to MAX_STRAND_LEN-1) of color_t;
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variable strand_store: strand_store_t;
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process(led_data)
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function make_color(data_in: std_logic_vector(BITS_PER_LED-1 downto 0)) return color_t is
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begin
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if rising_edge(clk) then
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led_colors(i) <= strand_store(to_integer(unsigned(led_addr)));
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if udp_valid = '1' and receive_state = DATA and active_strand = i then
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strand_store(pixels_received) := (
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red => udp_data(23 downto 16),
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green => udp_data(15 downto 8),
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blue => udp_data(7 downto 0)
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return (
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red => data_in(23 downto 16),
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green => data_in(15 downto 8),
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blue => data_in(7 downto 0)
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);
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if pixels_received = num_pixels - 1 and udp_last = '1' then
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led_data_arr(i).was_written <= '1';
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end if;
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end if;
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if clear_write_flags then
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led_data_arr(i).was_written <= '0';
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end if;
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end if;
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end process;
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end generate;
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process(led_data_arr)
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end function;
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begin
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all_strands_written <= '1';
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some_strands_written <= '0';
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for i in 0 to NUM_STRANDS-1 loop
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if led_data_arr(i).was_written then
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some_strands_written <= '1';
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else
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all_strands_written <= '0';
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end if;
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led_colors(i) <= make_color(led_data((i+1) * BITS_PER_LED - 1 downto i * BITS_PER_LED));
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end loop;
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end process;
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fsm: process(clk)
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type strand_buffer_t is array(0 to MAX_STRAND_LEN-1) of std_logic_vector(BITS_PER_LED * NUM_STRANDS - 1 downto 0);
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type strand_banks_t is array(bank_t) of strand_buffer_t;
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variable strand_banks : strand_banks_t;
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variable received_strands : std_logic_vector(NUM_STRANDS-1 downto 0);
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variable input_bank : bank_t;
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begin
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if rising_edge(clk) then
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clear_write_flags <= '0';
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run <= '0';
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led_data <= strand_banks(output_bank)(to_integer(unsigned(led_addr)));
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if all_strands_written then
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frame_number <= current_frame;
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clear_write_flags <= '1';
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if (and received_strands) and sender_done then
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output_bank <= input_bank;
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run <= '1';
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case input_bank is
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when BANK_A => input_bank := BANK_B;
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when BANK_B => input_bank := BANK_A;
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end case;
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frame_number <= current_frame;
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received_strands := (others => '0');
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else
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run <= '0';
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end if;
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if reset then
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clear_write_flags <= '1';
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received_strands := (others => '0');
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receive_state <= RESET_STATE;
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elsif udp_valid then
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if udp_last then
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@ -150,14 +133,12 @@ begin
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when MAGIC =>
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if udp_data /= MAGIC_NUMBER then
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receive_state <= DROP;
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else
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if (unsigned(udp_length) - HEADER_LEN) / 4 > MAX_STRAND_LEN then
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elsif (unsigned(udp_length) - HEADER_LEN) / 4 > MAX_STRAND_LEN then
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receive_state <= DROP;
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else
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num_pixels <= (to_integer(unsigned(udp_length)) - HEADER_LEN) / 4;
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receive_state <= STRAND_NUM;
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end if;
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end if;
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when STRAND_NUM =>
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if unsigned(udp_data) >= NUM_STRANDS then
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@ -168,20 +149,24 @@ begin
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end if;
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when FRAME_NUM =>
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if not some_strands_written then
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if not (or received_strands) then
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current_frame <= unsigned(udp_data);
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elsif current_frame /= unsigned(udp_data) then
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current_frame <= unsigned(udp_data);
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clear_write_flags <= '1';
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received_strands := (others => '0');
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end if;
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pixels_received <= 0;
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receive_state <= DATA;
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when DATA =>
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strand_banks(input_bank)(pixels_received)((active_strand+1) * BITS_PER_LED - 1 downto active_strand * BITS_PER_LED) := udp_data(23 downto 0);
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if pixels_received /= num_pixels - 1 then
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pixels_received <= pixels_received + 1;
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elsif not udp_last then
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elsif udp_last then
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received_strands(active_strand) := '1';
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else
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-- packet too long
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receive_state <= DROP;
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end if;
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