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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：
0 m* M$ t( _6 x4 n .cinit : LOAD = FLASHC, PAGE = 0 /* Load section to Flash */
& W5 z0 c, W8 t' ?+ h) \6 E RUN = RAML6, PAGE = 1 /* Run section from RAM */! K; d4 T ^* k( H: P* ]' S2 K! {
LOAD_START(_cinit_loadstart),
! v7 s, {- q; v! }+ Q- w( G" W RUN_START(_cinit_runstart),, X; x$ R: F r
SIZE(_cinit_size)
2 R# G4 X) u* |- G' h7 L复制代码5 g9 s3 Z$ z% F
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。
$ V2 A) q" u3 [0 E% K( A6 o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。. |2 i' h5 @8 [
那么本文后半部分就讲全部拷贝的方法。 Q* o* U% t6 L8 o" ?) m
首先我们来看F2806x_CodeStartBranch.asm这个文件。6 D4 A. c n: D; Y4 ~
***********************************************************************: d: a q1 O. o; f Y# H) N
* Function: codestart section0 L9 q" ~% v1 }6 ?7 s5 j) C1 e0 }
*. q, S" ]. ^( j" u6 v4 @# [
* Description: Branch to code starting point7 }$ p" \( f, l
***********************************************************************
~/ R s/ a' h: p9 e, {! V; X
6 I, v# {7 q1 G5 ^" X .sect "codestart"9 _; f1 O; Q. L7 G
9 e6 @" o8 R) B/ E% h& k
code_start:
& z" J o" I: j( q .if WD_DISABLE == 1
1 o. ^0 @' L% h$ X LB wd_disable ;Branch to watchdog disable code
! f6 c( ~, `' \/ s .else
! p# a( V$ ~0 c3 F8 w; } LB _c_int00 ;Branch to start of boot.asm in RTS library
3 T, `% i9 S/ H4 W1 V. w: N9 U; O! r .endif& q c5 W. B ~. |5 s
# F) o% s+ @" b8 b" H
;end codestart section! P( y2 h# A- f) s1 k
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3 R( k1 v' i2 v0 k9 L1 x' g xcontrolSUITE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。
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5 W& I6 `/ \+ A& k8 R那么我们就把这句话改掉。让他跳转到另一个地方去。
2 G2 [( O: i- k/ B: g+ w .sect "codestart"
1 g. L2 K5 I' Q; | @7 r' K! n( K( X$ _" U/ F
code_start:1 z' X$ w; P% N3 f
.if WD_DISABLE == 1: M+ r, n2 l6 P
LB wd_disable ;Branch to watchdog disable code4 n( W6 f% B" V, C
.else
( W4 S& R. t8 H$ n3 k) j Y2 P LB copy_sections ;Branch to copy_sections
4 X. y$ Z* P6 l .endif5 w7 z8 C# H: x5 }: ^5 p5 e
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1 j6 q6 J( h' X: n/ B, I, P7 |' 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/ X' d& J" R W s! q# z4 M
;############################################################################# c8 n+ g# q* {: N* Z( L
;
% m. K* h* H% F) O+ j4 Q; D; FILE: DSP28xxx_SectionCopy_nonBIOS.asm9 g# ]! K4 k/ P4 M% g
;
3 c" n% S3 U) k) n/ D1 ~; DESCRIPTION: Provides functionality for copying intialized sections from ( l" q; ~$ _6 F8 c- z
; flash to ram at runtime before entering the _c_int00 startup1 X1 G' U' G0 o
; routine- d8 X7 G& T% p# g: X. U
;############################################################################- ~5 v2 e" n& r J; m! {$ T! i
; Author: Tim Love
/ ~% t: D8 V1 r3 x, j1 P3 e; Release Date: March 2008 & L* Q) C) k6 v* c- q) W
;############################################################################
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% {# L$ E" p* S! N/ X4 O; }+ y+ n7 X) _" @( p+ G
.ref _c_int00
. f+ h! z! [; d# { .global copy_sections
8 B3 F9 B5 h( K& t .global _cinit_loadstart, _cinit_runstart, _cinit_size
, s5 h, t, M9 ]. b" k .global _const_loadstart, _const_runstart, _const_size1 Q, F% u; f' \ w. r
.global _econst_loadstart, _econst_runstart, _econst_size3 q& o; H; D9 V. L e" i
.global _pinit_loadstart, _pinit_runstart, _pinit_size
8 |2 J5 \) ? {6 h2 l+ s .global _switch_loadstart, _switch_runstart, _switch_size5 k0 c7 `) b/ T
.global _text_loadstart, _text_runstart, _text_size3 F( C# ?' V, }& q. f: D5 ]& x: I) }
.global _cla_loadstart, _cla_runstart, _cla_size
' j3 |( v. b; e $ P5 b8 n: i: M' |7 M% P- ^; [; c
***********************************************************************% k6 ?2 O ]% M' `) T
* Function: copy_sections0 ]" d( C6 o* m" ], a* H# i
*
9 ]; Z% V6 {- c* Description: Copies initialized sections from flash to ram
$ z+ s0 p5 k5 R" n***********************************************************************- r9 z$ Q8 }& a1 X7 U/ R
$ p3 u# }. r+ D$ k1 ?$ i3 Y/ V3 C
.sect "copysections"
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copy_sections:
1 ]( k+ t$ K0 Z: b* @" r, T6 _1 `
- m% [) m/ i! f/ K% C MOVL XAR5,#_const_size ; Store Section Size in XAR5
! j/ d1 [0 V9 O6 v MOVL ACC,@XAR5 ; Move Section Size to ACC" R5 z, ]+ R6 X" N
MOVL XAR6,#_const_loadstart ; Store Load Starting Address in XAR6
0 `' S$ h4 a: y8 B MOVL XAR7,#_const_runstart ; Store Run Address in XAR7
( m+ b2 x1 W1 x1 a: F7 R6 y LCR copy ; Branch to Copy
6 o& G O: b; H, W . O& ^. A( `4 B. h& Y' `' F: K$ J
MOVL XAR5,#_econst_size ; Store Section Size in XAR59 R; H) F- t" o. }" ]; W% U
MOVL ACC,@XAR5 ; Move Section Size to ACC1 ?2 X1 X/ l, R6 A `" b
MOVL XAR6,#_econst_loadstart ; Store Load Starting Address in XAR6
4 ?2 n9 R! C2 A6 P' D. |- f6 i2 R MOVL XAR7,#_econst_runstart ; Store Run Address in XAR75 z3 O/ k1 {6 X1 k
LCR copy ; Branch to Copy
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3 t0 ~9 Z5 v, V$ Q: t; g3 Z J MOVL XAR5,#_pinit_size ; Store Section Size in XAR5! _; U, s. [ R. ]6 w
MOVL ACC,@XAR5 ; Move Section Size to ACC* e: Q( P; ^! ^( U8 S0 b2 }: e
MOVL XAR6,#_pinit_loadstart ; Store Load Starting Address in XAR60 h* B) J3 s* A% O8 t
MOVL XAR7,#_pinit_runstart ; Store Run Address in XAR7
$ E; U" y) T F( [- D: A# W LCR copy ; Branch to Copy
; ` Q2 ?7 m, N' W E3 y
! S" y* G4 W8 h$ ?: R$ M MOVL XAR5,#_switch_size ; Store Section Size in XAR5
! x( B: ]* }% e% X2 y" j MOVL ACC,@XAR5 ; Move Section Size to ACC
6 Y9 a# y" ~6 A/ u- z MOVL XAR6,#_switch_loadstart ; Store Load Starting Address in XAR6
8 B( ~+ ^8 B o4 l1 U MOVL XAR7,#_switch_runstart ; Store Run Address in XAR7
$ N/ q8 q' q( `1 U7 M LCR copy ; Branch to Copy3 b1 Q$ U' \, k/ G( \
) F3 R2 u3 l1 }7 O/ T2 d! R MOVL XAR5,#_text_size ; Store Section Size in XAR5
* c% o* d/ V+ Z, g MOVL ACC,@XAR5 ; Move Section Size to ACC
. m+ q/ U) k# }& r MOVL XAR6,#_text_loadstart ; Store Load Starting Address in XAR6
- V& P( q+ U2 |& O7 | a8 a MOVL XAR7,#_text_runstart ; Store Run Address in XAR7; n: I' ?# K0 z: k
LCR copy ; Branch to Copy
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MOVL XAR5,#_cinit_size ; Store Section Size in XAR53 o6 K7 a. A: ]) n. e0 z6 `; b
MOVL ACC,@XAR5 ; Move Section Size to ACC! A1 f3 [: J, f- e4 g
MOVL XAR6,#_cinit_loadstart ; Store Load Starting Address in XAR6 B& R- `0 R8 }- ^
MOVL XAR7,#_cinit_runstart ; Store Run Address in XAR75 `/ J& Z: m3 f" E5 ?
LCR copy ; Branch to Copy . Z7 L) V7 a( t. ^& S
; ~/ R4 w- n$ o0 ~ MOVL XAR5,#_cla_size ; Store Section Size in XAR5
* ^0 r" j0 ^& P0 s MOVL ACC,@XAR5 ; Move Section Size to ACC
9 K! }% o V$ I- e6 W6 E7 D+ D MOVL XAR6,#_cla_loadstart ; Store Load Starting Address in XAR6
0 D% G, W- `( K MOVL XAR7,#_cla_runstart ; Store Run Address in XAR79 p* C) ]/ l/ ^5 Y! Q2 ~7 _0 p
LCR copy ; Branch to Copy
/ J! d$ i$ h# p3 D* D4 {! d3 r) k4 L0 {" Q# E% n N I: Z$ r/ \
LB _c_int00 ; Branch to start of boot.asm in RTS library
9 C) `9 p& d: [6 v3 v) P+ t" @& ?0 b; l' _
copy: 4 t5 [4 {8 L2 e* t
B return,EQ ; Return if ACC is Zero (No section to copy)
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' i& @0 r ]4 e! O7 z" [ RPT AL ; Copy Section From Load Address to
1 W3 ?7 u6 ?8 W" a; w || PWRITE *XAR7, *XAR6++ ; Run Address. E: M* X. w$ y
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return:; e* A$ q8 V, z7 n0 [& }9 z( ^
LRETR ; Return: }: Z2 |2 D! n# V0 J
, y: S% M- n9 c! G. m4 C .end
6 x! @! K0 y/ ]. z5 M2 S
& h8 m( I( E' Z. H4 x' \;//===========================================================================* U* w4 I- U* F' W: ]+ @( X
;// End of file.% u. Q+ q0 [ \; a f" p
;//===========================================================================
4 ~4 o' V6 o/ k- o* m S9 g复制代码
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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。5 M/ i$ ~7 d. b4 [. y) j" @! R$ {
然后所有的数据段都拷贝完了，在跳转会c_int00继续执行。4 _; n4 u4 v% j; q( L
这样就完成啦。是不是很简单。! r' P$ R$ T' z* {3 B! o! i
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发表于 2016-6-28 15:07
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