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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：
3 l# w% R2 W! C4 q5 V8 I. } .cinit : LOAD = FLASHC, PAGE = 0 /* Load section to Flash */
( M! T f) `( a/ n! I; t+ }) o# g RUN = RAML6, PAGE = 1 /* Run section from RAM */- Z# R9 l: y# w# e4 n6 a
LOAD_START(_cinit_loadstart),) e; t5 `. ?7 T% N: P9 L' |
RUN_START(_cinit_runstart),
- h, i" {# x6 _$ w5 s SIZE(_cinit_size)& L' O# A- F. k/ C; X
复制代码 }# x( b* o0 E; V1 `6 M) S
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。$ D2 y- D- v- S5 K: v: P/ m: 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。
% Q2 c2 V7 E- W/ L1 W那么本文后半部分就讲全部拷贝的方法。5 A$ E5 R4 d" ^' N8 q4 W* q9 F
首先我们来看F2806x_CodeStartBranch.asm这个文件。, t! c6 u; }, I( W f7 t
***********************************************************************
6 h, k1 H& N! J' p/ X$ N* Function: codestart section
2 c* i8 j6 o/ X2 p( B, p. F9 M*
6 ` N. c, v9 L" u( n7 V- P& Z* Description: Branch to code starting point& n+ d! [! [; h% i( w& H. r
***********************************************************************
! W( V) e5 w8 M- a9 X8 j. ~% S4 c/ Y2 B# y9 t/ k; b! m; I
.sect "codestart"1 j4 N j' W, C2 |/ c1 o
% X& k: Z4 `$ |+ ^+ o
code_start:, p6 s7 D- |9 N. Z7 ]" s- r5 W
.if WD_DISABLE == 1. G( O0 G" \: D8 O& K4 |" i! O
LB wd_disable ;Branch to watchdog disable code
2 p7 J }: e2 S7 P9 o .else k1 c$ ?. m6 J8 L( q( @
LB _c_int00 ;Branch to start of boot.asm in RTS library" }, g/ U- E! k) l! t
.endif: i0 ] j" ^& d
$ T, k+ D* ~" c9 [ m0 h4 P
;end codestart section
% l! H9 ]9 s: M) O' o3 X复制代码5 O( K. Z3 y! P5 x0 Z5 Y
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。
0 c9 E: w! b7 J: j1 _5 l$ j- i5 y
- c( a/ C8 R0 S那么我们就把这句话改掉。让他跳转到另一个地方去。' v+ ]; h% W9 W# L% o
.sect "codestart"
! g) W! b* K+ X" u# F! p) B# ^" _' X# E7 M" S
code_start:0 }4 e/ z% Q8 h7 k9 ~0 [
.if WD_DISABLE == 1) Y* W$ y# X5 f8 S
LB wd_disable ;Branch to watchdog disable code
& [' @7 I8 @$ @' k" G B .else) o5 Z5 i) S) C, J
LB copy_sections ;Branch to copy_sections
. b) z& s$ r2 G- b% h7 A .endif
) a9 m: |! G( _" w R# U复制代码: X+ ?% ~9 M% | x8 V- 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.asm
3 L6 [+ u2 O% T) l0 z B! ];############################################################################- V/ M6 g8 t/ m8 \
;
: F! F+ L- c0 z# \0 b; FILE: DSP28xxx_SectionCopy_nonBIOS.asm
6 S6 l7 u# k9 M$ r, X! P;
, h: }0 V; C; T; {; DESCRIPTION: Provides functionality for copying intialized sections from 9 n+ Y( ~) ]8 Z# D& `
; flash to ram at runtime before entering the _c_int00 startup0 X4 C, D" A1 @
; routine, ^7 N( d: }8 b* Q5 X/ h: l
;############################################################################) O3 H/ V; R4 x* e, G: V
; Author: Tim Love
: s! N% a' @' N# Q/ ~7 ^0 M) w$ u; Release Date: March 2008
m5 K: l w _2 N' v6 L, A1 X7 b;############################################################################
+ o* [1 L" ?5 J O$ G
" ?0 L2 X9 l& q1 z/ b. a6 C7 m, ^% _9 H) p' V6 \+ F
.ref _c_int00
* Q- m- x6 j, i! Y" x# ^5 Q& N .global copy_sections
: ]( H4 A }# _0 k8 c8 O& w" r .global _cinit_loadstart, _cinit_runstart, _cinit_size
0 w; z% `/ z; m" {3 e4 P+ v" ^4 } .global _const_loadstart, _const_runstart, _const_size$ W/ y6 _4 o u0 ~
.global _econst_loadstart, _econst_runstart, _econst_size
1 o! D4 [- j! D& J$ @ .global _pinit_loadstart, _pinit_runstart, _pinit_size
" ?- z5 ?! c; c .global _switch_loadstart, _switch_runstart, _switch_size
: F2 ~% _ d! s8 P .global _text_loadstart, _text_runstart, _text_size
4 ]7 M1 M! R* C* k7 C" J .global _cla_loadstart, _cla_runstart, _cla_size
5 ~' m; x- n, K: t
4 U1 v8 Z5 O; P1 W, p; }5 r/ }***********************************************************************
: y9 h' W8 U8 g" v' B* Function: copy_sections
- l( l! Q6 F& |) }*, B9 l' Y4 \' n1 Y$ `/ }- e/ g$ W5 p
* Description: Copies initialized sections from flash to ram- U. H; x$ y& g; Z3 V+ P' M
***********************************************************************& a2 ]: L. u- l- m7 }' L
3 Z+ y: T7 W- j+ Q5 l
.sect "copysections"
6 {6 } W" D; m+ A# W- J* _ \7 |3 Y+ Y% b' |: i% T! a7 A7 A" M+ W' s9 l
copy_sections:+ {% b1 @7 Q/ f
( r6 S& p5 [( d, D2 M0 Y
MOVL XAR5,#_const_size ; Store Section Size in XAR5
$ @% W/ O/ \ L, h& Z MOVL ACC,@XAR5 ; Move Section Size to ACC
4 s6 J( y5 U4 ~. q# c" h" y) Z MOVL XAR6,#_const_loadstart ; Store Load Starting Address in XAR6( U* B+ u/ T! f
MOVL XAR7,#_const_runstart ; Store Run Address in XAR7
S! c0 z7 g3 h" ~ s$ H* N7 h LCR copy ; Branch to Copy( [, {& w, ^7 S' L0 H
* x( M- m- F- N, S7 T# w
MOVL XAR5,#_econst_size ; Store Section Size in XAR5
! N5 z2 e& Z! I. ~: s" _ MOVL ACC,@XAR5 ; Move Section Size to ACC1 P5 ?; @! L( P" _+ i: \
MOVL XAR6,#_econst_loadstart ; Store Load Starting Address in XAR69 D% ^; ]1 s J; n
MOVL XAR7,#_econst_runstart ; Store Run Address in XAR7
- K9 p# ]# h0 R" n LCR copy ; Branch to Copy$ G7 ^! m7 L, P9 b2 M$ B$ l2 D9 c
% p6 }2 L8 Q: e! d" _% Y( l
MOVL XAR5,#_pinit_size ; Store Section Size in XAR59 j3 G3 m$ B1 P z% }
MOVL ACC,@XAR5 ; Move Section Size to ACC) r% q- |' Q; v( v: t# a9 v
MOVL XAR6,#_pinit_loadstart ; Store Load Starting Address in XAR6
1 e! \! E+ |; J9 y# d MOVL XAR7,#_pinit_runstart ; Store Run Address in XAR7- y; V4 s! h. n, s" O" r
LCR copy ; Branch to Copy
9 T9 F. G" D' ~$ X8 `0 P' V7 r7 U& @: J$ J$ o
MOVL XAR5,#_switch_size ; Store Section Size in XAR5
/ \! H/ ^9 a, V, T0 {! O MOVL ACC,@XAR5 ; Move Section Size to ACC" ^! e! ^5 y, Z3 R- ^ X
MOVL XAR6,#_switch_loadstart ; Store Load Starting Address in XAR6+ P: H5 \" g7 f9 M( B
MOVL XAR7,#_switch_runstart ; Store Run Address in XAR7
- W& x" S) G: X0 n: z+ V4 x2 {9 { LCR copy ; Branch to Copy8 A) h, w0 o6 H, ]+ E" F
5 _' s- F1 r* z2 k1 R
MOVL XAR5,#_text_size ; Store Section Size in XAR5! S; v1 l/ e4 O3 \
MOVL ACC,@XAR5 ; Move Section Size to ACC
- K: J! T& N6 Q2 [ C; @2 u MOVL XAR6,#_text_loadstart ; Store Load Starting Address in XAR6* k* l( D6 r" m9 C4 @+ J
MOVL XAR7,#_text_runstart ; Store Run Address in XAR7. a2 H4 ^# ^9 G* I A& c
LCR copy ; Branch to Copy9 v, E& V: e0 B% J( T/ D
" V" L# v' k' @: @9 ` MOVL XAR5,#_cinit_size ; Store Section Size in XAR51 Z% f( T5 {5 ~; [
MOVL ACC,@XAR5 ; Move Section Size to ACC
" A0 M c! Y* {( h, ]/ d4 S* N MOVL XAR6,#_cinit_loadstart ; Store Load Starting Address in XAR63 B0 M4 s* Z" E
MOVL XAR7,#_cinit_runstart ; Store Run Address in XAR7
: e! _, ]* A) g( Z: J LCR copy ; Branch to Copy
& U9 m: W" {" d3 o4 ^( G- p/ n. f1 z V. R
MOVL XAR5,#_cla_size ; Store Section Size in XAR5, E8 J! m. B1 W! O- N+ K
MOVL ACC,@XAR5 ; Move Section Size to ACC$ Z1 o0 E" Q1 A* \/ `7 P9 W3 o7 X
MOVL XAR6,#_cla_loadstart ; Store Load Starting Address in XAR6
, @3 O4 D. c/ b( Z8 }$ \1 ^) `& r MOVL XAR7,#_cla_runstart ; Store Run Address in XAR7
$ L( ^! B# o, a# C# i* d6 R' U LCR copy ; Branch to Copy
4 S+ z5 v- `% o' l% ?8 S) e! q4 Q5 x/ [0 d0 n0 c( M P
LB _c_int00 ; Branch to start of boot.asm in RTS library" D. z' B" J8 c/ l
1 ~, y$ @6 S. S/ D b7 b9 U% rcopy: & f# S$ }& V$ o6 e$ ~6 [/ m
B return,EQ ; Return if ACC is Zero (No section to copy)
& A* R$ T2 N5 ?
5 k! I% M9 W5 t RPT AL ; Copy Section From Load Address to
) E& z+ i+ \1 d/ L8 c: S& X" K/ ^* n4 _2 L. a || PWRITE *XAR7, *XAR6++ ; Run Address
2 j4 q6 c7 s! u1 J9 k" a# N3 e/ `0 {, ^! _: j* M" {
return:
, @. }3 h" t; W9 m! o LRETR ; Return
8 A( S9 Q- C9 ~7 X) H) O" L' C( r Y* v/ o3 w$ E1 B! I
.end9 \5 W; Y; }4 S B
( C2 k% o+ Q& X& m' e
;//===========================================================================6 y" f. u- j- i4 L Q
;// End of file.. K' X9 R- q, {1 M
;//===========================================================================4 O, O3 S, J) h3 r
复制代码. ~* X1 S5 U/ y$ r
" T9 _2 T, m6 K! C# g! k
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。, w0 d' j* b& X0 @" j9 z& @
然后所有的数据段都拷贝完了，在跳转会c_int00继续执行。
7 X9 W) }- e; l) Q2 S这样就完成啦。是不是很简单。5 `4 d6 _# ]3 I) ]
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发表于 2016-6-28 15:07
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