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各位大大好~+ h# n1 Y9 n! D0 W: t
我要用ADC0804抓一個0~5V 電壓~
& L( F; ~8 ]2 O! w0 \8 k0 P- ~ M5 z下面是唐佩忠那本書裡面的ADC0804的VHDL程式碼~
% _, J- g! L8 I他只有對0804的WR跟RD做控制~~ v1 p* F/ O0 K& W9 d g( L7 _8 H3 h
那CS 跟INTR都不用做控制嗎?
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不知道有沒有大大~有用過FPGA來控過ADC0804的嗎?7 e$ f8 t! j# \: C1 }3 p2 D6 A _3 }& K
希望可以向你請叫問題~0 p! _% A& e. I+ S1 V% U
非常感謝~~' d+ t3 @+ N( P* G+ {0 o [7 X/ e
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Library IEEE;$ V2 |! _) k: l8 l9 z2 e
USE IEEE.std_logic_1164.ALL;
* _" {1 o4 Y8 G9 q4 |! ]USE IEEE.std_logic_arith.ALL;: w9 r7 y5 p' B' }( ?
USE IEEE.std_logic_unsigned.ALL;
" p1 C: F9 {& d0 WENTITY ADC0804 IS* d9 t( G7 U4 j q
PORT4 I4 C: \+ W) u4 J# r5 v
(
& b! K' H! _: I) o AOP : OUT STD_LOGIC_VECTOR(7 DOWNTO 0);
; }9 ?, E0 {: Z7 u4 W, w, X AIN : IN STD_LOGIC_VECTOR(7 DOWNTO 0);8 I7 S: D* K: k- g( H3 @/ Z
WR : OUT STD_LOGIC;
1 Z8 @3 I* Y& @0 l- Z; T RD : OUT STD_LOGIC;8 j2 V, {; n' n$ M) L
CLK : IN STD_LOGIC;: G7 ~% r2 A6 V: L# v
FERQ : IN STD_LOGIC; d6 o* V3 P4 d! Z9 H, j
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END ADC0804;
6 A% X. z, n7 sARCHITECTURE a OF ADC0804 IS; K; r- ?9 M: e+ [7 f
SIGNAL D0,D1,D2,D3 : STD_LOGIC;
^# Q' i' S8 \4 ]BEGIN
: s/ D! ~3 y7 \9 o7 n--*********************************************************************
3 ~/ w7 E# V/ u; \4 g6 itime_sequence : block
. w. N7 P5 H Q- k/ {BEGIN
! |" @' t8 P; g! M( k8 A process(CLK)
. s; g+ Z0 q ` begin
[/ t- e) }9 {1 R- |$ i if CLK'event and CLK='1' then8 Q1 D- q5 }7 i" d+ s# I) q/ C3 I o
D3<=D2;
: v4 F$ I A/ n5 g D2<=D1;
) N0 T. G0 i# ^9 d2 j; Z. ~ D1<=D0;
% ]& i3 G% p' L( v/ h. G D0<=FERQ;$ z( ^5 b& w3 e3 K) i
END if;, O. B+ e" Y+ f7 P5 C7 _
end process;5 T6 @; M0 L6 B3 k! L6 L
RD <= not (FERQ or D0 or D1);1 y5 D- A G+ D- @9 ?9 S
WR <= not D3;4 d& M: q. q5 b* K
end block time_sequence;
+ `* _* x! i$ o1 M* ~8 q1 }--*********************************************************************! L o0 y# T) _3 k0 q
ADC_FETCH : block8 J& |% g) D) R1 G
SIGNAL EC : STD_LOGIC;9 i2 }0 {: B. I( ^% [
begin
4 ]- h: S6 t' Y- F, m process(CLK)
; Q' d) F |; p begin* s! ~0 ^+ T& G X" f! _& g
if CLK'event and CLK='1' then, L0 }4 i8 F o' k3 d4 H
if EC='1' then) m+ h8 T" |& {$ i4 s8 I
AOP <= AIN;
* \; m G9 }0 ^2 Z; o% ^# E" Y/ ` end if;
- i& l+ R; o$ Y2 g/ T8 b6 V Q end if;( r, y0 V1 w/ \; p# l* Z6 I( P& G- S" |
end process;4 Z( f; D& f' G# P
EC <= D1;) f# X1 v0 R" z5 e( b/ R5 S
end block ADC_FETCH;# i+ {) ^, O5 q7 f4 w3 n V
END a; |
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