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Line 7... |
use work.pkgDefinitions.all;
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use work.pkgDefinitions.all;
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entity serial_receiver is
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entity serial_receiver is
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Port (
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Port (
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rst : in STD_LOGIC;
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rst : in STD_LOGIC;
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baudClk : in STD_LOGIC;
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baudOverSampleClk : in STD_LOGIC;
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baudOverSampleClk : in STD_LOGIC;
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serial_in : in STD_LOGIC;
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serial_in : in STD_LOGIC;
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data_ready : out STD_LOGIC;
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data_ready : out STD_LOGIC;
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data_byte : out STD_LOGIC_VECTOR ((nBits-1) downto 0));
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data_byte : out STD_LOGIC_VECTOR ((nBits-1) downto 0));
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end serial_receiver;
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end serial_receiver;
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architecture Behavioral of serial_receiver is
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architecture Behavioral of serial_receiver is
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signal current_s: rxStates;
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signal current_s: rxStates;
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signal filterRx : rxFilterStates;
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signal filterRx : rxFilterStates;
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signal syncDetected : std_logic;
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signal syncDetected : std_logic;
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signal getPoint : std_logic;
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begin
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begin
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-- First we need to oversample(4x baud rate) out serial channel to syncronize with the PC
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-- First we need to oversample(4x baud rate) out serial channel to syncronize with the PC
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process (rst, baudOverSampleClk, serial_in, current_s)
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process (rst, baudOverSampleClk, serial_in, current_s)
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begin
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begin
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Line 94... |
if syncDetected = '0' then
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if syncDetected = '0' then
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current_s <= bit0;
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current_s <= bit0;
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data_ready <= '0';
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data_ready <= '0';
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byteReceived := (others => '0');
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byteReceived := (others => '0');
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waitBestPoint := 0;
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waitBestPoint := 0;
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getPoint <= '0';
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elsif rising_edge(baudOverSampleClk) then
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elsif rising_edge(baudOverSampleClk) then
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case current_s is
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case current_s is
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when bit0 =>
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when bit0 =>
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data_ready <= '0';
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data_ready <= '0';
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if (waitBestPoint < numTicks) then
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if (waitBestPoint < numTicks) then
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waitBestPoint := waitBestPoint + 1;
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waitBestPoint := waitBestPoint + 1;
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getPoint <= '0';
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else
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else
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waitBestPoint := 0;
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waitBestPoint := 0;
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byteReceived(0) := serial_in;
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byteReceived(0) := serial_in;
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current_s <= bit1;
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current_s <= bit1;
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getPoint <= '1';
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end if;
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end if;
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when bit1 =>
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when bit1 =>
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data_ready <= '0';
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data_ready <= '0';
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if (waitBestPoint < numTicks) then
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if (waitBestPoint < numTicks) then
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waitBestPoint := waitBestPoint + 1;
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waitBestPoint := waitBestPoint + 1;
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getPoint <= '0';
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else
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else
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waitBestPoint := 0;
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waitBestPoint := 0;
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byteReceived(1) := serial_in;
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byteReceived(1) := serial_in;
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current_s <= bit2;
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current_s <= bit2;
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getPoint <= '1';
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end if;
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end if;
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when bit2 =>
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when bit2 =>
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data_ready <= '0';
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data_ready <= '0';
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if (waitBestPoint < numTicks) then
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if (waitBestPoint < numTicks) then
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waitBestPoint := waitBestPoint + 1;
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waitBestPoint := waitBestPoint + 1;
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getPoint <= '0';
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else
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else
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waitBestPoint := 0;
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waitBestPoint := 0;
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byteReceived(2) := serial_in;
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byteReceived(2) := serial_in;
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current_s <= bit3;
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current_s <= bit3;
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getPoint <= '1';
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end if;
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end if;
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when bit3 =>
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when bit3 =>
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data_ready <= '0';
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data_ready <= '0';
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if (waitBestPoint < numTicks) then
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if (waitBestPoint < numTicks) then
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waitBestPoint := waitBestPoint + 1;
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waitBestPoint := waitBestPoint + 1;
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getPoint <= '0';
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else
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else
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waitBestPoint := 0;
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waitBestPoint := 0;
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byteReceived(3) := serial_in;
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byteReceived(3) := serial_in;
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current_s <= bit4;
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current_s <= bit4;
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getPoint <= '1';
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end if;
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end if;
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when bit4 =>
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when bit4 =>
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data_ready <= '0';
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data_ready <= '0';
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if (waitBestPoint < numTicks) then
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if (waitBestPoint < numTicks) then
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waitBestPoint := waitBestPoint + 1;
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waitBestPoint := waitBestPoint + 1;
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getPoint <= '0';
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else
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else
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waitBestPoint := 0;
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waitBestPoint := 0;
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byteReceived(4) := serial_in;
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byteReceived(4) := serial_in;
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current_s <= bit5;
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current_s <= bit5;
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getPoint <= '1';
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end if;
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end if;
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when bit5 =>
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when bit5 =>
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data_ready <= '0';
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data_ready <= '0';
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if (waitBestPoint < numTicks) then
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if (waitBestPoint < numTicks) then
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waitBestPoint := waitBestPoint + 1;
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waitBestPoint := waitBestPoint + 1;
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getPoint <= '0';
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else
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else
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waitBestPoint := 0;
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waitBestPoint := 0;
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byteReceived(5) := serial_in;
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byteReceived(5) := serial_in;
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current_s <= bit6;
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current_s <= bit6;
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getPoint <= '1';
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end if;
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end if;
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when bit6 =>
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when bit6 =>
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data_ready <= '0';
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data_ready <= '0';
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if (waitBestPoint < numTicks) then
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if (waitBestPoint < numTicks) then
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waitBestPoint := waitBestPoint + 1;
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waitBestPoint := waitBestPoint + 1;
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getPoint <= '0';
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else
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else
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waitBestPoint := 0;
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waitBestPoint := 0;
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byteReceived(6) := serial_in;
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byteReceived(6) := serial_in;
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current_s <= bit7;
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current_s <= bit7;
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getPoint <= '1';
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end if;
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end if;
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when bit7 =>
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when bit7 =>
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data_ready <= '0';
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data_ready <= '0';
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if (waitBestPoint < numTicks) then
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if (waitBestPoint < numTicks) then
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waitBestPoint := waitBestPoint + 1;
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waitBestPoint := waitBestPoint + 1;
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getPoint <= '0';
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else
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else
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waitBestPoint := 0;
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waitBestPoint := 0;
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byteReceived(7) := serial_in;
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byteReceived(7) := serial_in;
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data_byte <= byteReceived;
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data_byte <= byteReceived;
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current_s <= rx_stop;
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current_s <= rx_stop;
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getPoint <= '1';
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end if;
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end if;
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when rx_stop =>
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when rx_stop =>
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data_ready <= '1';
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data_ready <= '1';
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data_byte <= byteReceived;
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data_byte <= byteReceived;
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Line 186... |
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when rx_idle =>
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when rx_idle =>
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data_ready <= '1';
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data_ready <= '1';
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data_byte <= byteReceived;
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data_byte <= byteReceived;
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current_s <= rx_idle;
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current_s <= rx_idle;
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end case;
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end case;
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end if;
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end if;
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end process;
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end process;
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end Behavioral;
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end Behavioral;
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