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Line 23... |
--
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--
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-- VHDL Units : status_led
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-- VHDL Units : status_led
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-- Description: Provides a multi-state status LED controller
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-- Description: Provides a multi-state status LED controller
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--
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--
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-- LED Modes:
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-- LED Modes:
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-- 0x00 - LED is fully off
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-- 0x0 - LED is fully off
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-- 0x01 - LED is fully on
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-- 0x1 - LED is fully on
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-- 0x02 - LED is dimmed to 50%
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-- 0x2 - LED is dimmed to 50%
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-- 0x03 - LED Toggles at 1Hz
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-- 0x3 - LED Toggles at 1Hz
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-- 0x04 - LED fades in and out
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-- 0x4 - LED fades in and out
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--
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--
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-- Revision History
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-- Revision History
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-- Author Date Change
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-- Author Date Change
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------------------ -------- ---------------------------------------------------
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------------------ -------- ---------------------------------------------------
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-- Seth Henry 05/24/20 Created as a separate sub-component
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-- Seth Henry 05/24/20 Created as a separate sub-component
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use ieee.std_logic_arith.all;
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use ieee.std_logic_arith.all;
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use ieee.std_logic_misc.all;
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use ieee.std_logic_misc.all;
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|
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entity status_led is
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entity status_led is
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generic(
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generic(
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Sys_Freq : real;
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Reset_Level : std_logic
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Reset_Level : std_logic
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);
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);
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port(
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port(
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Clock : in std_logic;
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Clock : in std_logic;
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Reset : in std_logic;
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Reset : in std_logic;
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| Line 54... |
Line 55... |
);
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);
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end entity;
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end entity;
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architecture behave of status_led is
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architecture behave of status_led is
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signal Dim50Pct_Out : std_logic;
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-- hold the supplied integer.
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function ceil_log2 (x : in natural) return natural is
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variable retval : natural;
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begin
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retval := 1;
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while ((2**retval) - 1) < x loop
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retval := retval + 1;
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end loop;
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return retval;
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end function;
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signal Dim50Pct_Out : std_logic := '0';
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constant TAP1 : integer := 16;
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constant TAP2 : integer := 21;
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constant TAP3 : integer := 22;
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constant TAP4 : integer := 23;
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constant Init_Seed : std_logic_vector(23 downto 0) := x"000001";
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signal Half_Hz_Timer : std_logic_vector(15 downto 0);
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signal d0 : std_logic := '0';
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constant HALF_HZ_PRD : std_logic_vector(15 downto 0) :=
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signal LFSR_poly : std_logic_vector(23 downto 0) := (others => '0');
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conv_std_logic_vector(500000,16);
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signal One_Hz_Out : std_logic;
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signal Cycle_Toggle : std_logic;
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constant TIMER_MSB : integer range 9 to 20 := 18;
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constant TIMER_MSB : integer range 9 to 20 := 18;
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signal Fade_Timer1 : std_logic_vector(TIMER_MSB downto 0);
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signal Fade_Timer1 : std_logic_vector(TIMER_MSB downto 0) :=
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signal Fade_Timer2 : std_logic_vector(TIMER_MSB downto 0);
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(others => '0');
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signal Fade_Out : std_logic;
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signal Fade_Timer2 : std_logic_vector(TIMER_MSB downto 0) :=
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(others => '0');
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signal Fade_Out : std_logic := '0';
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begin
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begin
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Output_FF: process( Clock, Reset )
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Output_FF: process( Clock, Reset )
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begin
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begin
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when "001" =>
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when "001" =>
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LED_Out <= '1';
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LED_Out <= '1';
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when "010" =>
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when "010" =>
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LED_Out <= Dim50Pct_Out;
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LED_Out <= Dim50Pct_Out;
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when "011" =>
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when "011" =>
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LED_Out <= One_Hz_Out;
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LED_Out <= Cycle_Toggle;
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when "100" =>
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when "100" =>
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LED_Out <= Fade_out;
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LED_Out <= Fade_out;
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when others => null;
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when others => null;
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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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d0 <= LFSR_poly(TAP4) xnor LFSR_poly(TAP3) xnor
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LFSR_poly(TAP2) xnor LFSR_poly(TAP1);
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Timer_proc: process( Clock, Reset )
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Timer_proc: process( Clock, Reset )
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begin
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begin
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if( Reset = Reset_Level )then
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if( Reset = Reset_Level )then
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Dim50Pct_Out <= '0';
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Dim50Pct_Out <= '0';
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Half_Hz_Timer <= (others => '0');
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LFSR_poly <= Init_Seed;
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One_Hz_Out <= '0';
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Cycle_Toggle <= '0';
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Fade_Timer1 <= (others => '0');
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Fade_Timer1 <= (others => '0');
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Fade_Timer2 <= (others => '0');
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Fade_Timer2 <= (others => '0');
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Fade_out <= '0';
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Fade_out <= '0';
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elsif( rising_edge(Clock) )then
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elsif( rising_edge(Clock) )then
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Dim50Pct_Out <= not Dim50Pct_Out;
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Dim50Pct_Out <= not Dim50Pct_Out;
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Half_Hz_Timer <= Half_Hz_Timer - 1;
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LFSR_poly <= LFSR_poly(22 downto 0) & d0;
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if( Half_Hz_Timer = 0 )then
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if( LFSR_poly = Init_Seed )then
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Half_Hz_Timer <= HALF_HZ_PRD;
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Cycle_Toggle <= not Cycle_Toggle;
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One_Hz_Out <= not One_Hz_Out;
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end if;
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end if;
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Fade_Timer1 <= Fade_Timer1 - 1;
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Fade_Timer1 <= Fade_Timer1 - 1;
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Fade_Timer2 <= Fade_Timer2 - 1;
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Fade_Timer2 <= Fade_Timer2 - 1;
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if( or_reduce(Fade_Timer2) = '0' )then
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if( or_reduce(Fade_Timer2) = '0' )then
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