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#include <msp430.h>
4 P( O& o: m- v% T ~. Zchar readdata=0;
, J6 a# y0 N; l1 r2 O+ g' Dchar busy_data=0;
) }% Q) K2 g% [& S: a2 \void write_byte(char data_byte);) L; V0 f- q4 P( F9 ]/ g4 O
void send_command(char address1,char address2, char address3,char data);// command and address and data
4 \9 B! K5 J/ ]1 tchar recive_data(char read_address1, char read_address2,char read_address3);* u8 ~, X3 s @/ g- ?( C
void delay();
. Z# s# m1 F/ |* Nvoid erase(char command,char erase_address1,char erase_address2,char erase_address3);
' r) k3 g0 c/ e. a6 D6 ^' u% z% fvoid read_busy(void);
# \0 M$ a! v8 t* u, Fint main( void )
6 G9 W6 ^/ o) Y& c1 ?{
$ p9 e* @1 w( L // Stop watchdog timer to prevent time out reset0 k0 D9 w6 |$ U+ G; s
+ }, ?1 S8 k9 q WDTCTL = WDTPW + WDTHOLD; " H- o* U S' G1 m
P2DIR|=BIT5+BIT4+BIT0; //flsah sck hold cs out# e9 J6 T2 d+ i1 `) u
P4DIR|=BIT2+BIT3; //flash wp si output1 N7 e+ J- b' y6 ? H6 ]+ z/ K
( u* d9 O0 R" u4 Q: P# M& R
P4REN|=BIT1; // so pull up
& _3 \0 S! j- L2 A$ N/ C P4OUT|=BIT1; //flash so pullup selected p4.13 B$ u: ~# O' o# ~
P4OUT|=BIT2; //wp=1 A2 r3 Q( a5 L ^9 K$ Z+ G2 d0 K
S) W0 R# v. Z; I, {
P6DIR=BIT4;
4 B0 K3 t# }5 b3 S P6OUT=BIT4; //led
8 \! Q$ J" s- i P2OUT|=BIT0 ; //CS=1; # p [ }& y$ _. b6 q7 l* G
P2OUT|=BIT5; //sck=1;
1 f( L8 p% t H( f //P2OUT|=BIT4; // hold =1# H7 X6 d: V( Z1 g1 Y
_NOP();4 y1 Z8 j1 ^, C
_NOP();6 R0 L9 r2 |- ~9 H( R: K$ D' v5 \
P6OUT^=BIT4;
, J- W9 W0 H' P# H erase(0x20,0x00,0x00,0x00); * \* T5 f/ o3 A" i9 H8 |
read_busy(); 6 Q6 t( \2 d5 y" w8 z/ m# @
send_command(0x00,0x01,0x01,0x00); //xie,mingling ; U" i% Z1 Z: w4 Q* ^& w# G
read_busy(); ) ?' m" T! _; A
readdata=recive_data(0x00,0x01,0x01);
* E# V C8 A0 R, _$ P, ` while(1)+ L# a P8 `% o. @6 Y q
{$ T; L, x; a9 y8 ~
// send_command(0x00,0x00,0x00,0x0f); //xie,mingling
8 C: c2 F' _& V. ]# F 9 \4 ^% g% Q& J5 s" o! M
// if(readdata==0x00)# ^+ q+ R: K- l6 v7 X
P6OUT^=BIT4;7 E* c& [( k/ W, ~2 n$ f# I
delay();) A+ G8 B" L! Z" A! ^7 L! a
// readdata=recive_data(0x00,0x01,0x01); 1 W* g% D" F+ N- Y" p2 J
}+ J9 Y: g! h) h; h8 c1 _4 o
+ D6 [3 e0 J" P; d}
1 b9 V% R: i: f6 t# t! Lvoid write_byte(char data_byte)6 L) A% p1 A3 d- F$ b
{' j# I5 H. {! _5 z
char num=0;
6 I3 _ _& L1 P for(num=0;num<=7;num++)" n7 D. x: K+ e( X1 y
{
8 }# U- \$ q) y/ M5 \ 3 r' p, y) C2 ^ u( T
if(data_byte&0x80). c/ Z# U% c- z' B# o
P4OUT|=BIT3 ; //si=1;8 }; Q% G& `+ q
else0 p: a, w& P1 i
P4OUT&=~BIT3; //si=0; ; `4 P! b: e' L( f
P2OUT&=~BIT5; //sck=0;9 p/ _0 Z$ k& z# u
_NOP(); $ I6 _/ E4 q$ ^# x! j
_NOP();# H5 ~; j; f6 a5 _& _
_NOP();
7 d& R7 q; v- K( g) S& C _NOP();
; [9 H6 L3 g3 P0 G' F data_byte=data_byte<<1; //数据从高位传输
" H$ ?7 ?# O% I, ^8 N2 F9 Q2 _ P2OUT|=BIT5; //sck=1;
, p4 O3 Y6 i9 d3 h9 K0 D # c: c t8 @" Z& U( e0 _* d; u$ Q
# C$ B4 _+ F) t& c }
# |; y% S( }8 A: e0 X}
S- h: K2 M. d' B$ T4 ~2 Avoid send_command(char address1, char address2 ,char address3 ,char data)3 X8 j1 i# K' q) n+ p/ p) D1 k
{
, U+ O+ X0 N- G& T$ F$ h P2OUT|=BIT0 ; //CS=1; ! X O" y# O g: r
P2OUT|=BIT5; //sck=1;3 E! x! y: A, n- ?, J% ^
_NOP();6 M/ c$ V3 y% N+ N
P2OUT&=~BIT0 ; //CS=0;
: b; j- c; V+ u6 n2 N3 b write_byte(0x06); // write command2 y, G* @9 J# f3 ^& u
write_byte(address1);) A1 t! Q% I" ~4 p0 w# O) Q7 k
write_byte(address2);
. L: B) J. b& N* S" R write_byte(address3);$ i6 e9 m7 m9 I0 ~. L- F$ M+ c
write_byte(data);$ J' \ n6 c/ ~2 b7 I4 F( J
P2OUT|=BIT0 ; //CS=1;
. s4 }7 M# D) g* B _NOP();
( \5 O- @! C! u- d& t5 K _NOP();
" w9 r7 |, O% t1 b8 B( v _NOP();& k4 U" Z% F$ n
}
# g. e U9 b- @$ T8 @$ B3 d, r- B4 i
char recive_data(char read_address1,char read_address2, char read_address3)
; ~, T" }' i; P3 m5 o8 }' h{' V. `( X$ D, x: O
char read_data=0; + F3 w2 b8 }! x. b. i; ]# C" o% ^& f
char num=0;# z& Y2 t5 R) P( d; e
6 Y. A. M- |) A& W( o t W7 D! d P2OUT|=BIT0 ; //CS=1;
$ d' L- ?1 A# o7 a+ k) @- r P2OUT|=BIT5; //sck=1;
& F R- `7 @) d. \2 A _NOP();( [: E/ B& g2 o& c, o" q
P2OUT&=~BIT0 ; //CS=0; - P. M$ o" c2 L) n3 r
write_byte(0x03); ]# V* X+ V" M& j1 m; b( P& E5 X
write_byte(read_address1); 1 A9 k7 ? \, ~# x D N3 L
write_byte(read_address2); ( p. m4 g J* z: m
write_byte(read_address3); 5 c* i8 d! l+ w+ B7 ?, d
$ c- h9 I( q& Y; i+ b# W9 A
for(num=0;num<8;num++)
7 q: Q3 K6 }3 ]+ |5 l) k {
: _8 V. U& U( e8 v* m. o4 C P2OUT|=BIT5; //sck=1;
m2 @; q+ V. z/ l" F) v. V. Q4 r7 h read_data<<=1;
# s' [+ ]6 ^2 f+ x/ V8 S _NOP();" _% v) e) A) m. w" H) @" T. b
_NOP();" e$ d6 h' i) ?6 Z3 v, U
_NOP();
, R' g. S4 X y. f1 r _NOP(); 0 t( | E" g' `( [' ?- {7 _
P2OUT&=~BIT5; //sck=0;* r l& _7 e2 Q/ F$ H+ K3 n: h
if(P4IN&0x02)$ J7 h1 Y8 ~' F( b9 _6 x0 h! P! `1 k7 y
read_data|=0x01;/ o% t2 g& T7 I T# [
else
( q6 x' N$ P: f; @4 Q6 c, e read_data&=0xfe; $ {; V# g# O+ z7 |3 t
_NOP();1 y6 w; r' r+ [9 s: S( v
_NOP();4 Y' d# F- j0 a; ?: |3 h2 Z
} 3 ~' W8 T! R7 y- m" T1 A
P2OUT|=BIT0 ; //CS=1;
$ |* }( }. }$ ~+ u! {# u _NOP();8 T5 W* a4 v: Y( m. }3 W/ K, V
_NOP();
7 F5 r# O9 c' d( w! x _NOP();+ Z8 `: G0 _1 t3 I# a
return read_data;
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0 ]9 p. S, T5 P
}
l" Y. v0 w1 L; i# |, X3 g+ E/ Zvoid erase(char command,char erase_address1,char erase_address2,char erase_address3) N" f) l& O- o" E) @7 r- f4 F
{
7 v4 o. q" J0 O% \& t, c0 q! P P2OUT|=BIT0 ; //CS=1;
: X9 G" r: ?7 W% O3 e7 x2 ~7 ]( Z& l$ Y P2OUT|=BIT5; //sck=1;
! S5 p; J$ w+ V$ \( F: @1 T3 U _NOP();# _9 G* B9 M0 X1 V8 m
P2OUT&=~BIT0 ; //CS=0;: |, c# |3 }4 K) n5 D# ~
write_byte(0x06);
2 C: J) [3 y. R: V7 D4 H! _) | write_byte(command); 9 u: w' T1 B& |5 Y) r' L
write_byte(erase_address1);
) A4 Y Z8 x" m write_byte(erase_address2);
8 U/ \# v) |% ` write_byte(erase_address3);+ L w; @% ?1 ^2 h) R& L9 L
P2OUT|=BIT0 ; //CS=1;7 I4 ~; k! C# ~$ c- [! j
_NOP();
# o6 [+ x* F4 k- {: k _NOP();
. z2 o0 X2 P3 X1 j, m _NOP();
8 ^2 Y0 \7 A% ^ `! D}( W' Z5 m5 G+ h: P' J% O2 D! P
void delay()
; I1 a6 v h# O1 i. D4 ]: f{
, T4 s3 ^8 ?6 C unsigned int i=0;
& \/ K9 b, F7 @ {3 h! E+ h unsigned int j=0;4 B; Z' D3 }/ h* N E- A7 N
for(i=0;i<=500;i++). ~, c0 P. ?4 I
for(j=0;j<=250;j++)
4 q; f1 f- u- [: j ;
3 {+ {; ?4 U4 c6 S4 Q% B2 Z}
, M' P6 p5 C0 _void read_busy(). J! i8 `6 g$ O& P$ j7 M+ t( |4 j- F
{" W' D$ H* @$ p) \+ o, C
char read_data=0; 9 i: [3 u' P+ s5 z$ \
char num=0;( ^3 m+ J1 }) j
P2OUT|=BIT0 ; //CS=1; 6 U. j% w' ~) g7 N9 N
P2OUT|=BIT5; //sck=1;! l+ R. _/ M0 } H' G T6 R4 F
_NOP();8 |" l' W: _: [) b: S/ t
P2OUT&=~BIT0 ; //CS=0;# z# p( v" c% ~8 Z8 m* g$ H0 }
write_byte(0x05); // read the SR1 $ n! \( [ r' ^7 H/ F4 ]: M# i
do{
+ ]0 _7 ]. q/ \: y7 b ! a' s7 y5 V- J- O3 ^3 {
for(num=0;num<8;num++)5 p/ k0 M a* k0 s
{
4 C- a& n; h" w, E9 Z9 E7 n" @ P2OUT|=BIT5; //sck=1;
" X8 U. t0 v3 q9 R9 ^/ r) e _NOP(); 8 k2 Z- Q* G2 W+ G# \
_NOP();2 U! {9 a& |: f
_NOP();
% \7 P$ n( b7 `1 q; r _NOP(); & F9 b; F' v2 C* z6 t
P2OUT&=~BIT5; //sck=0;
- E! E8 A1 z% _/ Y8 M' E if(P4IN&0x02)+ O$ E0 Q2 K$ h
read_data|=0x01;
; D3 L$ H3 @$ W2 o- M else; v' J1 U+ z0 |& i
read_data&=0xfe; 8 R [; \( q( ?' t c
read_data<<=1;# \( t5 m" ^& H9 o' c9 ?& r
} ( J1 r! S f% }& _
_NOP();
! A: n9 ?: I& h x/ j _NOP();
- t o% r s+ ^9 X. q3 e; \; ` _NOP(); 1 r: `! H7 a+ _ i
busy_data=read_data; 2 X7 Z3 U7 n9 t9 b6 E
}. A' t9 F' m- e0 D. e& m
while((busy_data&0x03)!=0x02);, B, U+ _& _. Y5 M2 e
P2OUT|=BIT0 ; //CS=1;3 f. y( I" ~; v: k) Q' H. m& U
$ T# I4 c( l: j: h
; _" V1 K6 s, r1 |% Q}
8 n2 J& f/ F+ J
& I9 M* z0 e7 }; T用的单片机是msp430f5438A,模拟spi实现对flash程序的读写,现在读出的数据始终是FF,即应该没有写进数据,那位大神开源指点一二!
; Y2 Y* a- [: s/ O% `# J. t9 P$ s! n( k' e; O+ |4 i/ [
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