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首先每个数据段的存放位置，以及运行位置都是在cmd文件里面存放控制的。例如下面一段：
! V6 P4 K* h8 t) P .cinit : LOAD = FLASHC, PAGE = 0 /* Load section to Flash */ , w* l3 [/ I* M `% s3 q! Q
RUN = RAML6, PAGE = 1 /* Run section from RAM */' k: z/ k; b9 |5 b* H# O6 f
LOAD_START(_cinit_loadstart),3 s3 T. ?& Y2 O1 G5 K. M: L0 [: ^
RUN_START(_cinit_runstart),% k, J" T9 A; w, Q
SIZE(_cinit_size)
, Z ~3 }! z) G1 ^' D复制代码
3 c L$ _. }: k我们就可以看到.cinit这个段。存放在flashC段里。运行的会把函数拷贝到RAML6段里来运行。后面的三行表示存储的起始位置，运行的起始位置，以及该函数的长度。 u# ?8 F7 Z. u+ r3 U+ p
有了这些就够了。如果不能保证DSP在下载程序后不会掉电，那么程序就要烧写在flash里。运行的时候呢。要么就拷贝到RAM里，要么就直接在flash里面跑。拷贝到RAM里又要看你程序会不会比较大，可以只拷贝一部分还是全部都拷进去。3 u; d8 W C1 b6 G/ m6 Q" P) z
那么本文后半部分就讲全部拷贝的方法。" j. M% P; A$ F5 R2 t
首先我们来看F2806x_CodeStartBranch.asm这个文件。
1 N2 ]3 D; r' D) [) R***********************************************************************2 q, J% v2 M" `( L* p, P2 e
* Function: codestart section
2 @( O' I Y* u6 e9 F) J+ Y*$ j ~7 D8 E2 D( d. s
* Description: Branch to code starting point' A2 l. Q9 A+ V
***********************************************************************
3 F& j2 X/ j/ h2 j7 f; F) k& l# W* V9 |3 ?
.sect "codestart"8 R+ V- N0 r$ m1 E1 P) q
" H" I; m% y# T
code_start:6 X3 C# u. K% c
.if WD_DISABLE == 1
8 ^+ D$ ]1 `" P/ D9 D0 x LB wd_disable ;Branch to watchdog disable code' V2 Z" M* [+ Q: P& t6 k* d
.else
0 P& @0 _- p" o" {, N2 K7 u LB _c_int00 ;Branch to start of boot.asm in RTS library; a3 Q- z4 u/ X- `+ g6 L
.endif
$ C; |' }" P" \ v
# n8 ~. G- S$ m% p9 w;end codestart section
- A) d( _5 ]5 T$ w j+ F复制代码
: g( N ~2 m& _$ r7 U5 n. V" U6 J% \controlSUITE默认的文件呢是这个样子的。先关看门狗,然后在跳转到c_int00开始执行。当然这些都是在main执行之前做的事。/ k3 i7 J _6 J3 ^
7 {) ]6 I8 e0 O4 R
那么我们就把这句话改掉。让他跳转到另一个地方去。) u$ \8 n8 M( L
.sect "codestart"% r0 ~5 O" V0 i
& @; N( s) e3 h4 z: r# g
code_start:. a' | N& J: g( @' ^
.if WD_DISABLE == 1/ Q& x% l/ A7 t% Q- O
LB wd_disable ;Branch to watchdog disable code) K5 m7 L! u" Z1 K- ^
.else, @( x, f8 P- p# t; ]; R
LB copy_sections ;Branch to copy_sections
% j2 z& N. z6 N .endif
% o" x' p, ^* u+ p2 |; v; i复制代码
% D; \ A- D- E, J: V9 M8 L跳转到哪里去呢？我们就需要另一个文件给我们指示F2806x_SectionCopy_nonBIOS.asm
9 _& p0 e% x6 P A;############################################################################
4 W! o0 Z- G5 w, |;" y" l. E( W+ t7 {7 r
; FILE: DSP28xxx_SectionCopy_nonBIOS.asm) `6 H6 ~/ t+ N: {0 q9 u/ _1 O
;2 B6 {5 @! |6 H
; DESCRIPTION: Provides functionality for copying intialized sections from 1 c: ^1 @: B, H) @& c+ o) w4 y$ }& O
; flash to ram at runtime before entering the _c_int00 startup5 Z1 j: x( J6 x5 s6 o9 U# ]
; routine
; y5 O: a9 J) s4 R1 V: Q6 F4 V;############################################################################
1 k7 h+ r$ y1 l2 b; Author: Tim Love3 b' x. b) o0 I" o f. ?
; Release Date: March 2008 5 r& ]% n# m( e4 {
;############################################################################7 Z4 K. ?% `2 W
8 S. G8 v: x* y' j9 @- A
/ X& E+ N. u/ g9 _7 b .ref _c_int00. Y$ H, m( |4 f9 M7 E; S6 n
.global copy_sections
7 J) i- x* J( ?, L; E) \- I .global _cinit_loadstart, _cinit_runstart, _cinit_size
3 f! K7 E7 a9 W( v- f- t' j( G$ f$ u .global _const_loadstart, _const_runstart, _const_size
1 {9 R7 s) J. A) d6 P .global _econst_loadstart, _econst_runstart, _econst_size
; t5 e6 B" T: I/ @ .global _pinit_loadstart, _pinit_runstart, _pinit_size! H! O, E( e; \4 h' [
.global _switch_loadstart, _switch_runstart, _switch_size! {$ D( k( ^0 F' h' F
.global _text_loadstart, _text_runstart, _text_size
- m& j, K6 V' N1 b) _# T .global _cla_loadstart, _cla_runstart, _cla_size _" T. O6 J& G% |# u7 j C/ F
$ ~2 n; P1 _- q8 n. z
***********************************************************************
7 |& p# k/ t2 y; D0 V5 q3 h2 c* Function: copy_sections0 n/ Y/ @' r/ W) j# Q2 Q' X
*6 h/ ?8 ]3 n% x) d
* Description: Copies initialized sections from flash to ram' q/ p* h) c6 n* O0 q
***********************************************************************
, {4 G0 D& m, z" i9 |& G6 |* {9 J
.sect "copysections"
7 d6 s! f; N6 r% S
4 R* T4 H' @1 s5 T3 jcopy_sections:# [' D# K- t9 j g j( J
5 B/ `1 r l3 | MOVL XAR5,#_const_size ; Store Section Size in XAR5
0 O- e! S4 R( W2 W0 ]: `: R8 E MOVL ACC,@XAR5 ; Move Section Size to ACC0 ^5 ^0 o8 C: | P
MOVL XAR6,#_const_loadstart ; Store Load Starting Address in XAR6
4 x% g% J( j4 t3 m MOVL XAR7,#_const_runstart ; Store Run Address in XAR7" e( |: S2 J* O) v
LCR copy ; Branch to Copy
# i+ N, x$ n+ l: G5 n' } e3 m . m7 o- [/ D+ r2 f/ Y1 l+ y
MOVL XAR5,#_econst_size ; Store Section Size in XAR5
$ k: {* S1 } i' e( d# V: @ MOVL ACC,@XAR5 ; Move Section Size to ACC
7 L1 N7 U' @& U2 u( i MOVL XAR6,#_econst_loadstart ; Store Load Starting Address in XAR61 r- y7 _" E9 ?2 X. u
MOVL XAR7,#_econst_runstart ; Store Run Address in XAR7
* n& }' r, `! [6 c7 ~! N; m LCR copy ; Branch to Copy
4 m/ Y0 Q5 X: K/ t: J
- E3 [- [/ C6 S' J. a8 E MOVL XAR5,#_pinit_size ; Store Section Size in XAR5
( u7 i. \! ?- m2 e MOVL ACC,@XAR5 ; Move Section Size to ACC& j0 p9 d; t9 u: R7 e2 f
MOVL XAR6,#_pinit_loadstart ; Store Load Starting Address in XAR66 s0 ~0 m6 `( t+ u
MOVL XAR7,#_pinit_runstart ; Store Run Address in XAR7
) Y. e+ r- C; c" m2 b8 c( a LCR copy ; Branch to Copy
, N: z% ?4 j, g
6 p, z! p" _$ Y) S$ J/ i MOVL XAR5,#_switch_size ; Store Section Size in XAR5
# ]3 c P% P2 q# i MOVL ACC,@XAR5 ; Move Section Size to ACC) J- T! C; @. Y& j+ n
MOVL XAR6,#_switch_loadstart ; Store Load Starting Address in XAR6- |( ?( l' D8 |1 v b
MOVL XAR7,#_switch_runstart ; Store Run Address in XAR7, [! @, a4 S1 T
LCR copy ; Branch to Copy
+ N( }* i5 u, ^" u0 r# J; A$ p, d$ C$ n3 d1 G% ~/ n8 q" f* w* u
MOVL XAR5,#_text_size ; Store Section Size in XAR5$ o: P* g; |8 _" F. ]$ W& h) m; O
MOVL ACC,@XAR5 ; Move Section Size to ACC8 O, y' K( |! v+ m8 j: \2 ~
MOVL XAR6,#_text_loadstart ; Store Load Starting Address in XAR6, v9 y3 T+ T8 v0 s* g% }
MOVL XAR7,#_text_runstart ; Store Run Address in XAR7& u5 H+ r+ ]- ]0 S7 p/ T( E" H4 l
LCR copy ; Branch to Copy
: ?, O* f+ [# t! d- a ' y3 d4 D4 c: Y3 x) n
MOVL XAR5,#_cinit_size ; Store Section Size in XAR5
0 U. q0 J/ L: H# i- q# S) O4 u MOVL ACC,@XAR5 ; Move Section Size to ACC6 \7 J$ O9 U" A
MOVL XAR6,#_cinit_loadstart ; Store Load Starting Address in XAR6( ]& e4 S: C0 B" Y
MOVL XAR7,#_cinit_runstart ; Store Run Address in XAR73 T/ I7 N1 C/ Z) x1 h
LCR copy ; Branch to Copy
m& t+ e Q' g D' ^
) Q2 b# i8 T( x7 {3 E; }, h MOVL XAR5,#_cla_size ; Store Section Size in XAR5* N w( ]: q$ m! n e) Q( z
MOVL ACC,@XAR5 ; Move Section Size to ACC* r# n3 g. M( M, c
MOVL XAR6,#_cla_loadstart ; Store Load Starting Address in XAR68 S, U; k: H# t$ B4 `
MOVL XAR7,#_cla_runstart ; Store Run Address in XAR7
! T8 U2 p5 w/ b( i4 y$ |6 x LCR copy ; Branch to Copy6 r% d" A7 [* ~' [
. W, S* L3 t. U% u/ |" i LB _c_int00 ; Branch to start of boot.asm in RTS library
( w1 Z+ J* X! \" v9 f- R- [; B. B b% n* M1 Z% ]- f# S
copy:
$ u* F1 m$ _3 ? B return,EQ ; Return if ACC is Zero (No section to copy)
F% `# Z% K- D% g6 T6 o, e9 h* _& z3 K# N, t
RPT AL ; Copy Section From Load Address to9 W F# w$ V- X- F) V3 i
|| PWRITE *XAR7, *XAR6++ ; Run Address
) v; p4 G5 B- ^
8 |+ }7 j8 D) o2 @return:
& l' Q+ w0 Z9 W$ ?7 s8 ]& O5 ]) c, N LRETR ; Return
- Z. a3 V4 V7 C9 H3 C* V- Z: N. v: T
.end
+ h5 P1 }5 o" Q8 d 1 C2 v" o& P F/ o! K
;//===========================================================================- n0 o( O/ F0 d& C6 S. L& W d) u2 x$ H
;// End of file.
& A& X3 x) @0 |; J/ K: H- P;//===========================================================================: w2 R; Z$ s" A' A
复制代码& {/ E. i% V! l+ L
/ v( ]! c. V2 q% Z9 s: a9 F- z看到这个文件比较长，但其实是一直在重复。每段里是先把某一个程序段的长度给ACC，然后把存储起始地址，运行起始地址给XAR6,XAR7。然后就是拷贝。6 D$ S- Q: y1 ~" f
然后所有的数据段都拷贝完了，在跳转会c_int00继续执行。) q8 W/ j; [2 Q4 n
这样就完成啦。是不是很简单。% h6 F1 v" \+ i" E7 K" _1 {9 Z
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发表于 2016-6-28 15:07
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