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Impulsabstandsmessung

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Sven
Gast
New PostErstellt: 21.02.05, 17:16  Betreff: Impulsabstandsmessung  drucken  Thema drucken  weiterempfehlen Antwort mit Zitat  

Hi, ich habe Probleme mit VHDL.

Ich möchte gerne eine Impulsabstandmessung durchführen.
D.h ich habe ein digitales Signal welches regelmäßig den Wert 1 und 0 hat.
Jetzt möchte ich mit einer Referenzfrequenz, die deutlich höher ist als mein obiges Signal, das Signal abtasten und die Impulse der Referenzfrequenz zwischen zwei steigenden Flanken des Signals zählen.
Wie kann ich das am besten in VHDL realisieren?

MfG
Sven
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witteks
Stammgast


Beiträge: 27
Ort: Cottbus

New PostErstellt: 14.03.05, 21:07  Betreff: Re: Impulsabstandsmessung  drucken  weiterempfehlen Antwort mit Zitat  

Hallo Sven,

hier ein Lösungsvorschlag mit Testbench (im Anhang ZIP-Datei).

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

-- Uncomment the following lines to use the declarations that are
-- provided for instantiating Xilinx primitive components.
--library UNISIM;
--use UNISIM.VComponents.all;

entity Messung is
Port ( reset : in std_logic;
Zu_testendes_Signal : in std_logic;
clk_ref : in std_logic;
Impulsabstand : out std_logic_vector(15 downto 0);
Messung_fertig : out std_logic;
Ueberlauf : inout std_logic
);
end Messung;

architecture Behavioral of Messung is
signal halten : std_logic; -- zum Messen einer ganzen Periode des zu messenden Signales
signal Impulsabstand_zaehler : std_logic_vector(15 downto 0);
begin
process (reset, clk_ref)
begin
if reset = '1' then
Impulsabstand_zaehler <= X"0000";
Impulsabstand <= X"0000";
Messung_fertig <= '0';
Ueberlauf <= '0';
halten <= '0';
elsif rising_edge (clk_ref) then
if Impulsabstand_zaehler = X"FFFF" then
Impulsabstand_zaehler <= X"0000";
Ueberlauf <= '1';
else -- kein Überlauf
if Ueberlauf = '0' then
if Impulsabstand_zaehler = X"0000" then
if Zu_testendes_Signal = '1' then
Impulsabstand_zaehler <= Impulsabstand_zaehler + 1;
halten <= '1';
Messung_fertig <= '0';
end if;
else -- Impulsabstand_zaehler nicht 0
if halten = '1' then
if Zu_testendes_Signal = '1' then
Impulsabstand_zaehler <= Impulsabstand_zaehler + 1;
else
Impulsabstand_zaehler <= Impulsabstand_zaehler + 1;
halten <= '0';
end if;
else -- halten = '0'
if Zu_testendes_Signal = '0' then
Impulsabstand_zaehler <= Impulsabstand_zaehler + 1;
else
Impulsabstand_zaehler <= X"0000";
Messung_fertig <= '1';
Impulsabstand <= Impulsabstand_zaehler;
end if;
end if;
end if;
else -- Überlauf = 1
if Zu_testendes_Signal = '0' then
Impulsabstand_zaehler <= X"0000";
Ueberlauf <= '0';
halten <= '0';
end if;
end if;
end if;
end if;
end process;
end Behavioral;



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xiaoou
Vielschreiber


Beiträge: 53

New PostErstellt: 12.11.18, 06:05  Betreff: xiaoou  drucken  weiterempfehlen Antwort mit Zitat  

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thomaslist
Gast
New PostErstellt: 22.09.20, 09:41  Betreff: Re: Impulsabstandsmessung  drucken  weiterempfehlen Antwort mit Zitat  

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