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各位大大好~
. j. P2 z* F `. U# ^1 {我要用ADC0804抓一個0~5V 電壓~
' [) s. Y* M$ D; q0 Y% t3 {+ F. V. b下面是唐佩忠那本書裡面的ADC0804的VHDL程式碼~; g& s; C& p! r9 w' m7 E
他只有對0804的WR跟RD做控制~~! q( w" p' D( z! ~) s0 t+ e' c: d+ t
那CS 跟INTR都不用做控制嗎?/ t' @+ D, ~4 u7 @
7 z" r! j C) o8 A不知道有沒有大大~有用過FPGA來控過ADC0804的嗎?; k; c3 v) s' j3 A" w# N: A
希望可以向你請叫問題~6 m1 m6 x6 b4 d9 [& z1 |
非常感謝~~) F% Y4 [ D9 V- `& y! z/ P4 C
# m) p8 l% @$ y
: @" V5 O4 N7 |9 f0 d8 @Library IEEE;
* X3 }; S ]0 s1 Y; g+ qUSE IEEE.std_logic_1164.ALL;
" a# M) y+ B, dUSE IEEE.std_logic_arith.ALL;
/ _# y/ U" m+ X O/ SUSE IEEE.std_logic_unsigned.ALL;) t+ u5 n7 e; e ]2 I. H. J
ENTITY ADC0804 IS( l; z& g) h6 Q4 b6 N. h
PORT/ a a- s2 b% r2 |2 ]! K
(
9 F7 E, \& h5 x3 q AOP : OUT STD_LOGIC_VECTOR(7 DOWNTO 0);. U; }8 p: w8 ~6 ?
AIN : IN STD_LOGIC_VECTOR(7 DOWNTO 0);5 z1 O$ }5 Y+ g
WR : OUT STD_LOGIC;
" O6 ?5 P/ l% a" y$ B# T RD : OUT STD_LOGIC;
C4 _6 p9 T( Y2 ]* p CLK : IN STD_LOGIC;8 }$ X/ `+ Y9 i8 U Q6 C5 a% j; T j
FERQ : IN STD_LOGIC
$ W! ^$ k% Q2 u) Q8 ~: w5 ? );* _9 U" I0 ~* Z1 w, K
END ADC0804;) V1 s# G8 ]+ w+ P) U4 y" q
ARCHITECTURE a OF ADC0804 IS
/ D0 f: o$ u# NSIGNAL D0,D1,D2,D3 : STD_LOGIC;2 p0 U) E( \1 Q1 v3 [* Y
BEGIN: a& S8 b/ g4 y1 V5 |5 v1 E# d
--*********************************************************************# U: B5 s7 _4 z( S
time_sequence : block
1 k* A8 o8 z0 B K0 c: _4 ABEGIN
( s `1 s3 }- E: g process(CLK)2 W3 W$ B3 J/ K- z4 n' F* Z
begin3 l4 V# u2 _6 J" Y2 {
if CLK'event and CLK='1' then
( v' U5 k* a; Y6 _9 ~. z; M# K D3<=D2;
( Z6 R q/ P2 N9 N8 e8 u2 u D2<=D1;3 g& v5 ?* B* T6 }) \
D1<=D0;
3 b7 b: _1 }7 _+ J; u; g& E. f D0<=FERQ;: b" U! Y4 ?0 o$ y
END if;
. I5 j/ E! v3 v# J+ h! d2 u" z M end process;
- e0 ^/ h; f& B$ y3 F7 x/ l RD <= not (FERQ or D0 or D1);
# w& F6 @5 z7 F S) l WR <= not D3;
8 C+ B5 Q0 Z1 g# k2 L/ Dend block time_sequence;/ Q4 z4 T- ^, ?* o; b: O
--*********************************************************************5 A0 L( j5 G" e: I
ADC_FETCH : block( J! V5 b. W+ M8 ~* a* R1 {7 ~
SIGNAL EC : STD_LOGIC;
) w8 G7 k( z+ _% o& Qbegin/ R) E9 g& X5 P9 E- i `
process(CLK)* o, U U% q; {3 g; Z) s
begin0 h3 i# n: q9 j3 L
if CLK'event and CLK='1' then7 ~ K, h9 C2 [
if EC='1' then) P; c+ M6 `" w8 |" }1 p" C
AOP <= AIN;% f% O7 j2 W+ S" m% Q$ z1 d$ g
end if;
# c& j3 ^3 Y. ? |( w6 o end if;
: I$ ^. J% o7 t# X" P4 Q end process;
- H. r4 ?8 _( D1 D s EC <= D1;2 {$ [3 L) j8 K' {- m! c
end block ADC_FETCH;
, i3 C% v1 M+ v, q: L3 O3 x! cEND a; |
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