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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：6 @: a7 H* V: [% z m" {
.cinit : LOAD = FLASHC, PAGE = 0 /* Load section to Flash */
" y' r& Z2 [. F% _ RUN = RAML6, PAGE = 1 /* Run section from RAM */
" u. l6 D4 l6 a1 t% q LOAD_START(_cinit_loadstart),& ~4 N; R; k9 I& I9 E5 K
RUN_START(_cinit_runstart),, x9 N& |, P; L; }
SIZE(_cinit_size)
! L1 o6 [6 \% x+ x% e复制代码
# q8 _ ^2 ` [; `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。
! T3 C. K; u0 N: D" \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。
: w2 `- Q; f2 Z那么本文后半部分就讲全部拷贝的方法。& p4 F5 ?8 e6 s! f' E3 | b
首先我们来看F2806x_CodeStartBranch.asm这个文件。
3 ^& E8 j: Q/ I. J& r1 ^***********************************************************************
/ y* U8 R( B/ p$ A* Function: codestart section
, k4 a; W' I5 ]6 R*9 U& V7 f: F/ x" O
* Description: Branch to code starting point
, X/ H6 z& P# k6 |6 ?; P- ?0 {***********************************************************************0 ` E( y/ N0 I: S
4 J% y9 {, r( u; W4 e, |4 y
.sect "codestart"# Z! v0 c) o' @7 h, |+ d8 Z- d* g" {
5 }/ d+ u+ L) U) T! D
code_start:$ V, T7 @! D1 r0 |+ ?9 ^4 |. ^% D1 y' o
.if WD_DISABLE == 1
0 N, n: j9 y* Y* { LB wd_disable ;Branch to watchdog disable code
8 P9 }% L9 ~1 V6 ^ .else/ L f M0 I7 E; m$ E j' {
LB _c_int00 ;Branch to start of boot.asm in RTS library% m. a" n" B/ W7 N- |; V
.endif
' m$ h1 F( _, X
* r+ p! M& w( f% };end codestart section
4 R8 i/ P6 _) m/ e3 z复制代码
+ ]1 T8 }: T4 g6 QcontrolSUITE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。
7 m$ w% ^% L/ p6 w' h
8 c3 f/ m1 H9 P3 V" Z+ N那么我们就把这句话改掉。让他跳转到另一个地方去。
5 v( a }" g4 i) W: C( ]4 Q .sect "codestart"
. J# l% o6 C2 e7 y5 S. T# n5 Z, p- P2 s' T1 P
code_start:
( s) P, Q) V3 v5 ~& F .if WD_DISABLE == 1
3 ]9 D1 d& W Z1 c% ` LB wd_disable ;Branch to watchdog disable code
3 c# m6 G( z0 H* o .else; j. A0 q4 P# k" @: i
LB copy_sections ;Branch to copy_sections9 o$ f% c8 f m8 C: a( U# F
.endif
7 u7 G9 r9 V7 b* U复制代码2 \/ ]2 ^" c& }, e5 C" k% ]) N
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.asm3 y5 b/ t* h" @; @7 d3 s
;############################################################################) S* q5 O6 o# @! @3 c! s
;
3 {/ x5 z- Z, ^& b( j; FILE: DSP28xxx_SectionCopy_nonBIOS.asm" C' r; }- s7 X* t
;9 K' }4 [' T! ?6 q
; DESCRIPTION: Provides functionality for copying intialized sections from + p& M+ X" n9 l8 A& y, g7 ]% {
; flash to ram at runtime before entering the _c_int00 startup
7 r" g! W. J- q5 s+ _) S& k, S; routine
8 J( V9 q [2 ?/ \- M* d! ]3 h6 G2 {;############################################################################4 ^5 A* b* {" L: }! Z
; Author: Tim Love9 K" n, z5 `2 s* w! j; ~2 @# ^" B/ V
; Release Date: March 2008
2 s; \/ n+ B( O4 b;############################################################################! W8 I% x3 q. E
/ f i. k! k: L& ?$ U" d9 r7 w
5 T7 g6 ~. a9 ~! _; a0 s# b% Y7 ?4 g .ref _c_int003 p+ R0 n' @! M
.global copy_sections
. B' [1 s- {$ Z .global _cinit_loadstart, _cinit_runstart, _cinit_size
* ]2 \* ~( [6 C, {. z .global _const_loadstart, _const_runstart, _const_size
, U* @) y/ ?* a, V" `- {4 X+ V+ A .global _econst_loadstart, _econst_runstart, _econst_size- e; l7 {, C+ o) G
.global _pinit_loadstart, _pinit_runstart, _pinit_size
+ Q( Y; ^5 j6 m6 E8 n .global _switch_loadstart, _switch_runstart, _switch_size
2 K; E3 O- l8 s2 x: |, k+ t .global _text_loadstart, _text_runstart, _text_size, e" e% f$ f& L- h2 @
.global _cla_loadstart, _cla_runstart, _cla_size
" P5 M, {0 Z2 q , v6 r$ X! Q/ [8 m, a9 P
***********************************************************************
, j2 e5 l% Z0 K1 N4 O1 [* Function: copy_sections+ p6 s3 x# ?9 c- g4 V
*# v+ J/ q% W$ i4 J
* Description: Copies initialized sections from flash to ram
( r, o- q# P0 c$ \3 r3 V***********************************************************************
! m/ h1 O7 L* T d
- [/ s0 P% F% [% M& r. Z' J! F .sect "copysections"
2 t) @& f% t* p7 e0 z
. h3 B; X1 n1 m; g& Z$ S' Ycopy_sections:
$ O) O/ R. q$ M4 X
8 r: h5 E9 _! Q/ {- j" o* H# v MOVL XAR5,#_const_size ; Store Section Size in XAR5# W$ D6 ]0 J8 ?
MOVL ACC,@XAR5 ; Move Section Size to ACC& K: W) N! [/ b4 |# v& @' N
MOVL XAR6,#_const_loadstart ; Store Load Starting Address in XAR60 _: f: \$ H: w$ H& _
MOVL XAR7,#_const_runstart ; Store Run Address in XAR7
* ~" ~- y5 v6 X& K LCR copy ; Branch to Copy
. u0 k& A. h$ {9 a# c5 q 8 ]# s P* P, \) G. v! P
MOVL XAR5,#_econst_size ; Store Section Size in XAR5/ N5 j+ Q( p( @! g
MOVL ACC,@XAR5 ; Move Section Size to ACC
7 [& ]; S. r& T, A' M MOVL XAR6,#_econst_loadstart ; Store Load Starting Address in XAR6- F# @$ R$ f6 Z U7 y+ h3 G
MOVL XAR7,#_econst_runstart ; Store Run Address in XAR7
C+ k' H% F( E9 T; g$ o& s LCR copy ; Branch to Copy
7 c0 W, Z$ q, _7 X+ \ |9 ~3 K# g7 m- @; w* J8 v6 I4 N
MOVL XAR5,#_pinit_size ; Store Section Size in XAR5+ j, M5 @2 S4 x9 p' ]
MOVL ACC,@XAR5 ; Move Section Size to ACC
z1 p9 ^" |8 o; W( u7 N+ C& j9 A MOVL XAR6,#_pinit_loadstart ; Store Load Starting Address in XAR69 k. V0 Q/ Y+ f+ H E
MOVL XAR7,#_pinit_runstart ; Store Run Address in XAR7
& u) D6 r) m4 h+ N3 F! s5 K LCR copy ; Branch to Copy
( U Y& Y& {. O7 g. u# n* b8 f( k% w6 k/ {7 u' e: o" S) S
MOVL XAR5,#_switch_size ; Store Section Size in XAR5
- p, L( ~- m/ E p6 G2 n2 k6 e MOVL ACC,@XAR5 ; Move Section Size to ACC
7 I: O3 N9 E$ Q2 P3 Z# e) Y MOVL XAR6,#_switch_loadstart ; Store Load Starting Address in XAR6
! }; k) e. N: `- y MOVL XAR7,#_switch_runstart ; Store Run Address in XAR7
3 c; j- S& v9 \6 b+ v% \ LCR copy ; Branch to Copy) X2 g, s( q* l( W1 C9 f$ I
$ I1 m' o" M1 q8 X MOVL XAR5,#_text_size ; Store Section Size in XAR5
0 [/ S, Q+ P$ v( r/ w2 J% h MOVL ACC,@XAR5 ; Move Section Size to ACC
\$ k4 V0 B0 P( [; z MOVL XAR6,#_text_loadstart ; Store Load Starting Address in XAR6
# C. }. Z7 D. h; }3 L0 Y8 u MOVL XAR7,#_text_runstart ; Store Run Address in XAR73 w0 k1 I% b4 w* v2 D, b3 X
LCR copy ; Branch to Copy" p! r# R% a5 T8 c! I
+ c4 ]2 M- [! l/ v: @: a MOVL XAR5,#_cinit_size ; Store Section Size in XAR5
2 b4 v) B+ B+ }* p+ a& j: L1 M MOVL ACC,@XAR5 ; Move Section Size to ACC
) c; ?$ X3 M3 _9 `6 K MOVL XAR6,#_cinit_loadstart ; Store Load Starting Address in XAR6+ A5 I+ L- w3 L) w6 b; |( J& y
MOVL XAR7,#_cinit_runstart ; Store Run Address in XAR75 L" P5 E& _3 R$ W
LCR copy ; Branch to Copy
5 J' _% q$ }5 @) z9 `5 f! ]: r- Y' p& H4 y, h, _& q" N# z. H
MOVL XAR5,#_cla_size ; Store Section Size in XAR51 I# f9 O6 F- H: R2 ?' g' Y; @# C3 Z
MOVL ACC,@XAR5 ; Move Section Size to ACC3 N/ c: @0 n/ ]5 R& q: h6 U" c% `
MOVL XAR6,#_cla_loadstart ; Store Load Starting Address in XAR6; ^' D$ \1 e- y. }. N! h
MOVL XAR7,#_cla_runstart ; Store Run Address in XAR78 W' X; ~! F6 {, s. |5 ~
LCR copy ; Branch to Copy
, M! s- O& x3 V3 q
; n% f1 Z( V; F) L D1 c: C' x9 p( x3 o LB _c_int00 ; Branch to start of boot.asm in RTS library2 A2 D7 S+ ~& q; W" {
9 p9 U- x: ]7 L/ X4 Fcopy: 5 D+ ^$ c. b0 R
B return,EQ ; Return if ACC is Zero (No section to copy)! d7 W9 `' X! G" ]7 K+ u6 b
& L X/ |* {* {" v! }; W1 [ RPT AL ; Copy Section From Load Address to
% ~% y& O. M" O4 S7 I || PWRITE *XAR7, *XAR6++ ; Run Address) q7 n; O# l8 y) F( O0 ^, \
! C; s. {1 E j7 J; K
return:
8 U) z3 L/ e, T/ K+ x; u$ s LRETR ; Return2 Z; p2 o4 u( D% R2 T4 B
: y' @$ p+ a9 e( D, X+ F8 p
.end9 v4 e. l! ^0 s6 d
: n8 B" n# z$ a7 O# o* R- Z
;//===========================================================================+ `% u+ `3 |. U N# H0 b
;// End of file./ l1 \3 c" v- }( J4 n
;//=========================================================================== v( B5 G9 s6 ^
复制代码. z- g( S* K" a7 C
- k1 i* f8 @) g& j i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。3 e' d7 J1 w b$ P
然后所有的数据段都拷贝完了，在跳转会c_int00继续执行。
2 u* z% j6 P' G9 d* J这样就完成啦。是不是很简单。 E; L% H8 u5 h7 [5 W1 E
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发表于 2016-6-28 15:07
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