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各位大大好~
8 d& `: u. k1 B g2 B9 j我要用ADC0804抓一個0~5V 電壓~: m8 u9 {' [0 D, G* U% Y
下面是唐佩忠那本書裡面的ADC0804的VHDL程式碼~
}4 P# T$ M" S8 Y他只有對0804的WR跟RD做控制~~
- f, \* ]2 Y) m1 u( m4 t7 g5 i那CS 跟INTR都不用做控制嗎?
+ @& l$ X3 N/ F% h8 d2 _. X: Q0 T/ ]6 d4 ^, m
不知道有沒有大大~有用過FPGA來控過ADC0804的嗎?' g& b, N( L8 t$ U% S+ L, C
希望可以向你請叫問題~
: Z e( Q! P( ]$ _$ \7 L非常感謝~~
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9 s4 U" {$ y2 K9 v& K% {7 f+ r' e; L( @, t1 c, L" z1 E
Library IEEE;8 {4 y# P# T" M' G% D
USE IEEE.std_logic_1164.ALL;' e7 F" J9 i, x! _4 m5 B
USE IEEE.std_logic_arith.ALL;
& m- C7 W7 P6 PUSE IEEE.std_logic_unsigned.ALL;& _" G1 A7 a6 E; d0 Z+ s+ D" ~
ENTITY ADC0804 IS
* K l9 K5 W! q$ o, a* n, K PORT3 I8 F* I* M9 B L
(, r& g0 P1 u& H/ X* t
AOP : OUT STD_LOGIC_VECTOR(7 DOWNTO 0); R) j% F1 v5 l8 S9 q% v8 i
AIN : IN STD_LOGIC_VECTOR(7 DOWNTO 0);9 m3 B v, ~ |( T& `1 N
WR : OUT STD_LOGIC;3 ~* a# }9 x- b o4 D
RD : OUT STD_LOGIC;
4 t# T/ L, d s# d) {$ o$ z9 D' ~* _ CLK : IN STD_LOGIC;
+ `& }) }( u; `6 l" O& [8 Z2 h FERQ : IN STD_LOGIC- J( i& ?6 S7 b5 q- o
);
( w6 C1 g4 C; O$ [7 H1 VEND ADC0804;" y* L g2 `8 f Y. S& b* e0 I0 v
ARCHITECTURE a OF ADC0804 IS O' c% S8 t$ K
SIGNAL D0,D1,D2,D3 : STD_LOGIC;
! ~% ^% J' u3 K+ b( @6 s5 E. @3 C& S9 {BEGIN
+ ?& j; C! h4 w4 p--*********************************************************************
+ J4 h, o8 `5 j; gtime_sequence : block0 f: j6 W0 t9 K8 K ?4 H
BEGIN
" f; l- l; t9 H. H process(CLK)4 |7 l& O* R$ q7 W
begin
* L# {, U! {% d+ a4 G if CLK'event and CLK='1' then2 K; P e, ?( ?+ s
D3<=D2;
, f0 \% P! P [5 P- Y9 }/ O D2<=D1;
* m1 k4 q9 x/ B8 [ D1<=D0;6 Q+ m; x& s& A$ @ r2 S
D0<=FERQ;
7 ]& f9 h! v1 k* U END if;* t1 f2 D5 s' U4 l0 A& c+ k! K
end process;4 g( p. |4 n$ {$ u9 b. y, S/ `
RD <= not (FERQ or D0 or D1);
3 x6 [) d; }! E# E- l8 z+ L WR <= not D3;
4 t, d0 D0 v, F" m/ V& j8 S1 {) Wend block time_sequence;
( N p; \( @8 o7 ]2 e4 J--*********************************************************************; u) U. A& |6 u( }. R9 a) B4 }+ |/ N
ADC_FETCH : block6 |/ V- x. s3 d. b' z( S$ {5 h
SIGNAL EC : STD_LOGIC;
& ~9 i5 F5 y* J4 \begin; `' I# I' Y& I1 n+ C
process(CLK)) O8 K/ Y: @0 G* s% i
begin
- Z# j* Y D6 C2 o$ I if CLK'event and CLK='1' then0 H8 u6 U+ M; C$ d+ j* R
if EC='1' then
/ R7 Z9 L& m% V, @: e4 e9 o9 ` AOP <= AIN;
1 ]# h" J1 e+ Q8 J4 m1 d end if;
( `0 R) y/ a# }7 f: L end if;: s4 v2 X' |0 U. M) w2 O
end process;
! S# f, Z# e# b9 j' @ EC <= D1;
& ^2 b- V" n$ r8 k# g# ^end block ADC_FETCH;
5 ^+ d3 H) r9 REND a; |
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