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我写了个程序读光栅尺的值,我用示波器测输出,没有电平输出,苦恼中,求大神帮帮忙,在线等。
LIBRARY IEEE; USE IEEE.STD_LOGIC_1164.ALL; USE IEEE.STD_LOGIC_UNSIGNED.ALL; ENtiTY Meas IS PORT( MeasIn: IN STD_LOGIC_VECTOR(1 DOWNTO 0); Clk: IN STD_LOGIC; -- Updown: IN STD_LOGIC; Count: OUT STD_LOGIC ); END Meas; -------------------------------------------------------------- ARCHITECTURE Rt1 OF Meas IS CONSTANT Stata0: STD_LOGIC_VECTOR:="00"; CONSTANT Stata1: STD_LOGIC_VECTOR:="10"; CONSTANT Stata2: STD_LOGIC_VECTOR:="11"; CONSTANT Stata3: STD_LOGIC_VECTOR:="01"; -------------------------------------------------------------- SIGNAL Oldstata: STD_LOGIC_VECTOR(1 DOWNTO 0); SIGNAL Temp0: STD_LOGIC; SIGNAL Temp1: STD_LOGIC; SIGNAL Temp2: STD_LOGIC; -------------------------------------------------------------- BEGIN PROCESS BEGIN WAIT UNTIL Clk = '1'; IF MeasIn = Stata0 THEN Oldstata <= MeasIn; Temp0 <= MeasIn(0) XOR MeasIn(1); Temp1 <= Oldstata(0) XOR Oldstata(1); Temp2 <= Temp0 XOR Temp1; IF Temp2 = '1' THEN Count <= '1'; ELSIF Temp2 = '0' THEN Count <= '0'; END IF; ELSIF MeasIn = Stata1 THEN Oldstata <= MeasIn; Temp0 <= MeasIn(0) XOR MeasIn(1); Temp1 <= Oldstata(0) XOR Oldstata(1); Temp2 <= Temp0 XOR Temp1; IF Temp2 = '1' THEN Count <= '1'; ELSIF Temp2 = '0' THEN Count <= '0'; END IF; ELSIF MeasIn = Stata2 THEN Oldstata <= MeasIn; Temp0 <= MeasIn(0) XOR MeasIn(1); Temp1 <= Oldstata(0) XOR Oldstata(1); Temp2 <= Temp0 XOR Temp1; IF Temp2 = '1' THEN Count <= '1'; ELSIF Temp2 = '0' THEN Count <= '0'; END IF; ELSIF MeasIn = Stata3 THEN Oldstata <= MeasIn; Temp0 <= MeasIn(0) XOR MeasIn(1); Temp1 <= Oldstata(0) XOR Oldstata(1); Temp2 <= Temp0 XOR Temp1; IF Temp2 = '1' THEN Count <= '1'; ELSIF Temp2 = '0' THEN Count <= '0'; END IF; END IF; END PROCESS; END Rt1;
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