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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：7 y8 V! L* a( p% Z6 T. i, c4 @' V
.cinit : LOAD = FLASHC, PAGE = 0 /* Load section to Flash */
4 K" R. V. c" v9 O: _( M: |* g0 z: Y. [* ] RUN = RAML6, PAGE = 1 /* Run section from RAM */4 J" N2 V. ]0 R' O% R" k- |* a. K
LOAD_START(_cinit_loadstart),6 y# J- r$ _- O7 d2 {8 Y" ?
RUN_START(_cinit_runstart),
* h2 s, c: X) l' M1 w6 L6 I SIZE(_cinit_size). f( S3 q4 [4 i7 K1 _
复制代码3 z, y, W" V. C5 r+ g$ l' m2 v4 i
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。: v8 {0 q1 d5 }4 Z6 O9 i, Y) Y
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。8 z( Y7 w; K5 w! R+ [+ v
那么本文后半部分就讲全部拷贝的方法。
1 ?' z5 g5 i3 W5 H/ N9 X首先我们来看F2806x_CodeStartBranch.asm这个文件。. U3 |" O d8 ?6 h8 v, H( K
***********************************************************************- h! d# o& H- y( _9 D
* Function: codestart section% p" [( Q" Q+ ^0 @# s7 I* ]8 b
*
8 D9 i+ q* \& M. w* Description: Branch to code starting point$ l/ z& _* Z$ m- h: @; E( P$ x
***********************************************************************
/ b; N% i2 J/ g4 k$ V/ F+ G7 n# R" O" p
.sect "codestart"
+ {/ G8 I1 n1 j' w3 W/ g# ]5 Q) Y* n
$ o2 U+ X( }" \+ xcode_start:- H9 m3 k4 h5 Q: v; W4 y7 f0 v
.if WD_DISABLE == 1
; C5 j; n) m- v" o LB wd_disable ;Branch to watchdog disable code
. G i7 D, |! A- I0 d% o5 A) g .else
: o9 s9 x6 L' b( \ LB _c_int00 ;Branch to start of boot.asm in RTS library
$ h$ R) e+ N9 p( t .endif! u; D/ _ g9 Z+ P# S
7 C, z: {, T' S% G, g;end codestart section
9 l8 I; A7 u/ o- V8 i复制代码
5 s8 M5 M- F- a5 i6 |1 FcontrolSUITE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。 i3 e6 T% \* J$ w9 t- a0 q
# p7 C7 b: ^! z) D9 K那么我们就把这句话改掉。让他跳转到另一个地方去。- J r1 X8 @0 X0 Y; O
.sect "codestart"
" G) m ~8 Q1 K8 ]$ c1 s' n- b3 P9 }+ W6 f% C5 }, P+ z
code_start:- v, ^- ~# i* K1 R8 d% l
.if WD_DISABLE == 1
2 @9 `0 R. j0 E3 }, u# e LB wd_disable ;Branch to watchdog disable code. j/ z- B; C7 M5 ~3 C; [7 ^ o1 n
.else* x* [0 F* r, ], V3 U
LB copy_sections ;Branch to copy_sections% w/ f d# h% l4 E
.endif8 {$ S) c' U1 |9 v( H# I( c. v
复制代码
* ~; E5 w9 g7 C8 s; U! @) g/ @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$ e9 u! k& P* Z L3 V
;############################################################################* A% s3 h. o) q0 n3 b
;( W( l: ]( Z8 s; R6 }+ H+ L. F
; FILE: DSP28xxx_SectionCopy_nonBIOS.asm
" O8 ~& T% \+ ]$ | Z- \;+ u3 l% p( r+ k9 l: [
; DESCRIPTION: Provides functionality for copying intialized sections from
9 x' i9 t6 X' P& {% r/ s; flash to ram at runtime before entering the _c_int00 startup5 o/ o$ E0 n' \
; routine4 i/ n0 i P s0 d! K
;############################################################################! e/ `# Y. u- L/ x0 R& _- Z
; Author: Tim Love4 _4 ?1 G1 ?1 ]) @
; Release Date: March 2008
1 D% P. U& {1 ?# K; ~% X# l;############################################################################
3 {# o7 j+ }5 W* T7 J6 N, ]; g% v7 U& X* v! u2 Q& ~
$ o4 a& k. V: p; Z- n9 d- `$ o .ref _c_int00+ N# R8 _$ y8 i1 e9 k- ~
.global copy_sections
) m! I4 b6 H' ?3 u4 C7 h q' R .global _cinit_loadstart, _cinit_runstart, _cinit_size
; o. J, N6 Z! ~* x4 L! N .global _const_loadstart, _const_runstart, _const_size3 x$ y0 p* d/ v+ h8 Z! n% S2 F$ G
.global _econst_loadstart, _econst_runstart, _econst_size. o7 V- Z' ]' b4 [4 g' I+ n
.global _pinit_loadstart, _pinit_runstart, _pinit_size
/ a7 _9 E, v; T .global _switch_loadstart, _switch_runstart, _switch_size/ O% @- g4 @3 r* o/ l4 c4 o" Q
.global _text_loadstart, _text_runstart, _text_size$ B9 N) |' z$ y
.global _cla_loadstart, _cla_runstart, _cla_size* x6 j7 T; {: b, G" P
- b* W5 |3 ?; }$ }8 D***********************************************************************( I- ^; N i& C# y; |
* Function: copy_sections5 G& T& m! S$ i+ ?2 K9 i2 q
*
5 k/ n1 y" L1 G# |* Description: Copies initialized sections from flash to ram$ l9 K7 f& u+ d. ]! n) {
***********************************************************************
( C: }$ T. z% I; j# S3 d9 r5 X1 {3 h6 r! B ~
.sect "copysections"% e! X' l1 W6 I2 ], m s, C
( e2 Q* [$ n* @
copy_sections:
6 x1 k/ o5 J2 r9 U- B. z$ [3 a( G9 ^! w% _/ i
MOVL XAR5,#_const_size ; Store Section Size in XAR5
0 Y% G+ C7 `. J R MOVL ACC,@XAR5 ; Move Section Size to ACC
* A, L. L% R! k3 a1 e0 H0 l MOVL XAR6,#_const_loadstart ; Store Load Starting Address in XAR6% `. O, F- @# _+ g6 E V
MOVL XAR7,#_const_runstart ; Store Run Address in XAR7$ q& y0 I/ q6 ^1 G$ v, S
LCR copy ; Branch to Copy
% F' F! l% e4 V; D6 I $ w( N1 v) ^7 V9 F
MOVL XAR5,#_econst_size ; Store Section Size in XAR53 v) I2 A0 ^2 S# `% R
MOVL ACC,@XAR5 ; Move Section Size to ACC
: ~% V3 t5 A, {% y MOVL XAR6,#_econst_loadstart ; Store Load Starting Address in XAR6
* R. F& L% k& k, ~" S; z MOVL XAR7,#_econst_runstart ; Store Run Address in XAR7 y f6 t4 z+ t/ E% Y4 v
LCR copy ; Branch to Copy
% Z$ l6 g, U6 S" d
3 E* O1 ^ Z! _ MOVL XAR5,#_pinit_size ; Store Section Size in XAR5
0 K/ x. p/ l' k( ?$ k' y/ b. H MOVL ACC,@XAR5 ; Move Section Size to ACC f4 h) ~/ k1 I; G/ N5 I; Y
MOVL XAR6,#_pinit_loadstart ; Store Load Starting Address in XAR6& T0 j( ]1 v4 o* h
MOVL XAR7,#_pinit_runstart ; Store Run Address in XAR7
0 B3 ~9 Z* ~4 E& K LCR copy ; Branch to Copy
% k3 a$ }, c- @& z
$ v& _9 _/ P- ? ]' W* m; J MOVL XAR5,#_switch_size ; Store Section Size in XAR5
1 S% v. f0 a" f J2 } c MOVL ACC,@XAR5 ; Move Section Size to ACC
: E- _. Q, N; d. L: G MOVL XAR6,#_switch_loadstart ; Store Load Starting Address in XAR6
5 j$ q2 {8 S* m MOVL XAR7,#_switch_runstart ; Store Run Address in XAR7
% ~! L* o* ]) Q LCR copy ; Branch to Copy
9 R4 n. f# J2 s1 h
, _& ~1 \. K9 e1 u MOVL XAR5,#_text_size ; Store Section Size in XAR5/ S/ w9 t3 p" W% R$ q& ^6 F) [
MOVL ACC,@XAR5 ; Move Section Size to ACC
/ U/ d0 w+ E+ y/ G- S$ s2 G" U MOVL XAR6,#_text_loadstart ; Store Load Starting Address in XAR67 W* d$ w. m, ]+ f# v, o, u" S+ R
MOVL XAR7,#_text_runstart ; Store Run Address in XAR7. m4 S+ W& @6 ^( c% c5 k% i. F
LCR copy ; Branch to Copy$ |1 Z c8 [6 M
9 c: a( ?- L4 K: `
MOVL XAR5,#_cinit_size ; Store Section Size in XAR5, ?3 U8 c: w- L# g
MOVL ACC,@XAR5 ; Move Section Size to ACC4 B0 s% \& V3 d' W4 }- K
MOVL XAR6,#_cinit_loadstart ; Store Load Starting Address in XAR6
) o8 [3 N# s1 O" n- Y0 R MOVL XAR7,#_cinit_runstart ; Store Run Address in XAR7/ ~0 B8 a, b4 ?
LCR copy ; Branch to Copy
$ ^7 {+ a# g9 |* ~$ j4 v
. P( |3 W1 ~; V7 K3 w MOVL XAR5,#_cla_size ; Store Section Size in XAR57 `' ]* w0 C' S
MOVL ACC,@XAR5 ; Move Section Size to ACC
) D, u% |& k/ N! c$ Q. [ ^ MOVL XAR6,#_cla_loadstart ; Store Load Starting Address in XAR66 h4 J% I* q- W- Y) E, ~: x
MOVL XAR7,#_cla_runstart ; Store Run Address in XAR7, _+ J5 T" q1 d! I8 t- k
LCR copy ; Branch to Copy
( t+ m* Z$ n! O% I1 \
( q( ?4 J( Y: e" C% _/ F0 [ LB _c_int00 ; Branch to start of boot.asm in RTS library% I5 v6 N/ n% ^) M
' I! v# r) s5 \1 O1 F6 xcopy:
* y8 g. L- `8 L9 I B return,EQ ; Return if ACC is Zero (No section to copy)5 t% n v& Z6 q( X. B# i
( ? b9 \* b9 l RPT AL ; Copy Section From Load Address to9 b3 K8 S8 \7 U" f; ~/ q$ x3 k+ q
|| PWRITE *XAR7, *XAR6++ ; Run Address+ `! q- D' k& e) J" ^' B6 w
' ^0 v# s- x; ^+ }return:
9 @( T; j" `2 c8 m z LRETR ; Return
; Y0 L# Y8 V9 a; N2 U8 \; B4 F8 I& b4 I
.end
8 Y4 _; e9 c+ G8 @ ) K v' l" a" I" I# U
;//===========================================================================; f, X8 X; T j+ _" p
;// End of file.
5 G) s& O2 I" j;//===========================================================================
/ J! e( X" B* y复制代码
U6 A3 W! h6 @* o& N$ e* K) s3 B, q+ r" Q7 h) x4 T
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。9 R4 I9 s7 e: N/ d' ~' n; u
然后所有的数据段都拷贝完了，在跳转会c_int00继续执行。
! T2 \7 `) c; Z G8 u) U" N p+ P这样就完成啦。是不是很简单。
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发表于 2016-6-28 15:07
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