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#include <msp430.h>0 M7 c* k* [+ {# \" f
char readdata=0;# C4 p8 D8 v' j6 `4 B
char busy_data=0;
; x) s* t, h& A3 Y5 y: ^) Yvoid write_byte(char data_byte);. Y/ Y0 ?+ {6 K) h# D% r$ U& c0 {) h
void send_command(char address1,char address2, char address3,char data);// command and address and data2 V1 T2 R/ \& t0 g; T0 w4 O
char recive_data(char read_address1, char read_address2,char read_address3);2 x. m1 M6 a3 V0 Z
void delay();! O1 F1 L0 k% Z, L4 H3 v
void erase(char command,char erase_address1,char erase_address2,char erase_address3);
) H, v8 c7 `6 _2 G% Avoid read_busy(void);
) S; W: G, W X, Y G' f) pint main( void )
0 t+ `* N7 \; k+ G{
+ N# @* r2 M7 M6 e/ p // Stop watchdog timer to prevent time out reset
+ M3 [1 a, r, F3 t( _4 U . T, _) h1 M( o( x( a
WDTCTL = WDTPW + WDTHOLD; , `! c3 a& X- j; O. F; V
P2DIR|=BIT5+BIT4+BIT0; //flsah sck hold cs out& N; a$ N5 T+ F! \2 J
P4DIR|=BIT2+BIT3; //flash wp si output! Q, D( r- t+ Z( C5 p7 L) r C
+ P# R0 S( w. z' z! l) q P4REN|=BIT1; // so pull up
2 }. i+ d- j0 p% {2 F P4OUT|=BIT1; //flash so pullup selected p4.1
: h0 E |- B/ a. g8 L P4OUT|=BIT2; //wp=1
% P) A- j. f2 w
6 q) v. ^+ v* @1 W P6DIR=BIT4;1 h1 R+ k3 v- T2 g4 q# m7 d
P6OUT=BIT4; //led
1 J, d( V& w: R, o7 d8 \% ~0 z P2OUT|=BIT0 ; //CS=1;
7 w F- g9 O$ _# x4 T P2OUT|=BIT5; //sck=1;0 o( H/ p9 s2 Z0 M; D
//P2OUT|=BIT4; // hold =1
2 M0 B. |2 j. }% h8 u _NOP();
J) O7 o& Z" N5 o% P" r/ v0 H _NOP();
& C0 ?4 {# E) `2 f) } P6OUT^=BIT4;! F: U/ A! [7 \4 ]3 t/ M
erase(0x20,0x00,0x00,0x00);
2 z. d& j% ?+ a+ J# H read_busy();
& C2 L8 ]9 w8 B send_command(0x00,0x01,0x01,0x00); //xie,mingling : X# }- ~" d G' F
read_busy();
& p# A) m7 j$ L$ B9 ] readdata=recive_data(0x00,0x01,0x01);
* \ K3 E$ b& j+ N while(1)0 ?9 j' t, Z( \- ]
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// send_command(0x00,0x00,0x00,0x0f); //xie,mingling
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. q0 K! P3 a8 X0 ? // if(readdata==0x00)
& f3 R9 M: I% ~- z/ Y* u P6OUT^=BIT4;
1 t$ h( J5 W& `% J1 p" [/ ] delay();/ y$ W+ o9 N2 u, i! `
// readdata=recive_data(0x00,0x01,0x01); $ M6 A3 C6 B+ Q# A3 S8 V
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void write_byte(char data_byte)7 R3 b1 ?/ y, N' G/ y
{
, Y5 H7 [5 W/ Y char num=0;
( e3 i! Y' }% m for(num=0;num<=7;num++)
) {+ \# B; |% n" s {9 u; [, H( x) {. }. Q
+ N2 Y3 n. v* T0 U) K( W* }
if(data_byte&0x80)+ F* X l1 |7 p5 B
P4OUT|=BIT3 ; //si=1;
, H& x/ n% H7 z) h3 K+ m else
6 Y- z1 l. s3 ^; e. Y6 }# I+ Q6 C P4OUT&=~BIT3; //si=0;
`" d; \$ O# o2 N P2OUT&=~BIT5; //sck=0;
: U* J- j! M; W/ I* S% F! @ _NOP(); : _3 N& t/ a7 p6 a( }% h* \
_NOP();8 n# D7 n+ [4 J% C d8 y6 i
_NOP();! Y0 E* x V- ^9 |- A% c$ c k
_NOP();
1 f4 l& l, _3 g6 r data_byte=data_byte<<1; //数据从高位传输
3 u7 U" k9 }. k3 U& d; o P2OUT|=BIT5; //sck=1;
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void send_command(char address1, char address2 ,char address3 ,char data)
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/ x6 F4 X& D. p! ?4 D A+ \ P2OUT|=BIT0 ; //CS=1; & W) }. v, r$ _- {) w, T8 X
P2OUT|=BIT5; //sck=1;/ Q* I$ R# Q2 e0 n
_NOP();
& B4 b9 ]$ F; ?8 c% y7 e* U P2OUT&=~BIT0 ; //CS=0;
4 y5 C9 C) `, P) v write_byte(0x06); // write command
( t4 \2 |6 D$ p# I3 m' x write_byte(address1);2 f) q, i0 o: q2 q# y
write_byte(address2);
& s* ]. e; C+ C. Z" Y8 O5 j- g5 n) @ write_byte(address3);! O2 `4 T( N7 `. ?0 z) C8 M0 Z
write_byte(data);
: \. D j4 b: b2 K# l P2OUT|=BIT0 ; //CS=1;
+ R* e( {0 \! ^* Z1 R3 i# ]( {: @ _NOP();" o9 x/ I$ d. [; C
_NOP();' x# O1 n* g: d9 R5 U- W, e2 J; k
_NOP();
* W! R# H& Y2 M/ W, ~, J& M$ Z$ c}+ B8 `4 W! t- u9 j/ f( l, Z
% ^' s2 h; N" m8 h' z
char recive_data(char read_address1,char read_address2, char read_address3)
4 E7 u* W. a s2 y{& V' V1 Q- {* ]0 z! p
char read_data=0; * W q' Y* ?! O
char num=0;
# n- P1 ?3 F! B+ l
8 `3 a P3 }% P; Y+ g. ]0 G: i3 E P2OUT|=BIT0 ; //CS=1;
- n9 ^6 x4 b* y6 U: s P2OUT|=BIT5; //sck=1;
$ x1 ]$ U& E. T _NOP();
- |" S: G: o& _5 ?3 j P2OUT&=~BIT0 ; //CS=0; $ |+ M* w( F1 ^) R- {
write_byte(0x03);+ S6 b: b8 O* X; d! _5 W
write_byte(read_address1); 0 E3 C$ W- O, Y9 O4 ]
write_byte(read_address2);
; B- k d, ~$ `: ]- K" w write_byte(read_address3);
2 f% S, f' y( v' f' G
6 [% {* C0 e2 ^7 R0 D for(num=0;num<8;num++); ^$ u9 |+ h- l* s% R
{* F7 H8 n5 n) _+ _$ ^/ e
P2OUT|=BIT5; //sck=1; : V* v f+ a" t
read_data<<=1;
* L( e* g; U% E/ o$ p$ i _NOP();
& I# M' E& l' ~( j& E6 K2 J _NOP();+ [& ?$ f8 {2 m- v
_NOP();
3 z! w+ [2 k4 ?+ D _NOP(); & U4 n: C4 H' I8 [2 c! l0 I
P2OUT&=~BIT5; //sck=0;4 g: ]& F/ _4 Z- ]6 Z z' E' T4 S
if(P4IN&0x02). r& j' F8 |$ g0 P% ]0 e1 i/ p
read_data|=0x01;8 N: w2 V. A! M8 d" B0 U; K
else
5 f! M: _8 `6 h9 F read_data&=0xfe;
8 g# ]$ V" `+ Z+ X* S0 y( q# e) G8 g _NOP();
2 Q I( k! z3 I! p& s+ n _NOP();0 B; u1 M+ G3 A! }7 Q! K% z
} & n4 }9 Z# a. j
P2OUT|=BIT0 ; //CS=1;
7 S% a$ W* C( x _NOP();
+ x( {3 a ]9 g! x. t* V _NOP();
% Z) x8 b5 k* r; n! c _NOP();
1 h* }! L3 H, Z8 }/ M J return read_data;
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void erase(char command,char erase_address1,char erase_address2,char erase_address3)
" H. ^, U. ?+ I& i a{
, N0 ?8 Z4 B4 ^8 M6 Z P2OUT|=BIT0 ; //CS=1;
3 D0 ~, o) I4 \$ j+ `, ?. f P2OUT|=BIT5; //sck=1;
% l% v$ O6 s# s( M" I, @ _NOP();
2 T5 t% {# J2 U6 \ P2OUT&=~BIT0 ; //CS=0; q. u# A k+ o& u$ w7 l9 _7 j& d* L. L6 z0 I
write_byte(0x06);
G# Z X$ z3 e7 ?( F write_byte(command);
4 N8 r# c6 s, j B4 c* E" t write_byte(erase_address1);' |' m$ ^1 q. l( i: ^! o
write_byte(erase_address2);- h: `' B! Z8 S6 `1 D! Y' z1 W; O6 f
write_byte(erase_address3); C5 A5 f; C8 N; q0 q; h, a
P2OUT|=BIT0 ; //CS=1;
) q" `0 g$ Z$ P2 G _NOP();
$ K t1 [0 \3 \4 d% L8 f. p: C _NOP();
6 a ?3 {: {1 e C( G; F _NOP();3 W! ?) G8 H8 Y# S% ]5 @+ b
}# X! O) [" b( ~7 u$ s
void delay()
4 w8 q# j8 s$ G$ i/ f" B* y{
' r+ s" }6 p% z: J9 E" J unsigned int i=0;
9 V9 z! d1 ^' L' g" v unsigned int j=0;
" q% j4 M1 Z" C% ]! E for(i=0;i<=500;i++)! ^" o+ F8 K$ m( ?- {+ S
for(j=0;j<=250;j++)4 h) |7 c- A- b: y
;8 J* Q* N7 l6 h9 t( J* P8 q2 o
}
( v! B6 k s: bvoid read_busy()3 f. y2 L1 r7 n. |7 c
{
" u" [& @, U+ z4 t8 {* Y% m char read_data=0; 0 b! C- h! J8 n; X3 N8 m# b
char num=0;
# ]3 T( {3 d7 m1 ?" O P2OUT|=BIT0 ; //CS=1;
}1 P/ a; E* {' n( F1 W7 f P2OUT|=BIT5; //sck=1;
" r: { o8 w% l6 b8 p S _NOP();
% }9 E+ A/ }6 b6 ]- C P2OUT&=~BIT0 ; //CS=0;
& H% H2 s, _9 l7 }: _ write_byte(0x05); // read the SR1 " k3 }4 G( N& m: |5 S
do{
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+ J( n1 u+ Z& m$ w for(num=0;num<8;num++)+ L0 b$ s2 l) ^: w- D! g
{
2 g5 A1 Q+ G) i" l- m* h P2OUT|=BIT5; //sck=1; $ r% E. E. ^5 ?$ m- K# ^7 `" P, P
_NOP();
$ z! C; r. O$ Y; E( ?( P _NOP();
. e/ U' M7 F: s1 U8 T4 s3 _ _NOP();7 W" G( A. z& l7 D
_NOP(); ! f- D3 r+ q/ t3 `4 `
P2OUT&=~BIT5; //sck=0;
# Q4 j5 B5 }5 u2 E- [/ ~ j if(P4IN&0x02)
5 v5 [9 F. H) f r: E$ N; p* y read_data|=0x01;
; w) R4 [: Z3 r. J else/ w2 G* [6 \ a# ]! g
read_data&=0xfe;
7 L3 z! r B( K5 U, r1 s. ^6 K& l7 W read_data<<=1;# b d6 `0 |: w- a3 [$ Y; f
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_NOP();& X0 |6 {2 e8 d4 P0 l
_NOP();+ n* O7 s$ L1 q: ^: M- P
_NOP();
% V. C3 K. n+ M0 Z busy_data=read_data;
& k8 }3 w. b7 c% b$ R5 g2 q }: o8 G. M' t7 _- E8 b6 m P* W# _
while((busy_data&0x03)!=0x02);& i2 h- h1 @6 _% w0 K
P2OUT|=BIT0 ; //CS=1;
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1 a I5 D. Q3 q6 A$ S8 E- j3 A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!
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