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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:* T/ p/ J n; {6 T# S$ E
.cinit : LOAD = FLASHC, PAGE = 0 /* Load section to Flash */
2 h" q# s3 Y% H n2 } RUN = RAML6, PAGE = 1 /* Run section from RAM */+ x* I: N9 C4 X% v
LOAD_START(_cinit_loadstart),5 V& G* x( o! E& Q# C
RUN_START(_cinit_runstart),6 h2 P3 h& `% h& r
SIZE(_cinit_size)
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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。
{: y, T$ S9 z' j+ `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。
, I' K* [' m, Q那么本文后半部分就讲全部拷贝的方法。
/ _" U y( w* e3 o) ?! ^. ^首先我们来看F2806x_CodeStartBranch.asm这个文件。' j7 Z* r- O, |8 O
***********************************************************************
% w: C( J6 a# E/ J1 z/ D, ]* Function: codestart section
2 W2 q0 V( o9 l! _: a*
# t9 [' m z% L0 c* Description: Branch to code starting point% B) Q0 a$ s8 Q- x
***********************************************************************
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$ S, [ U& O% }" h$ g7 q .sect "codestart"
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code_start:/ u1 M( E( B S. w8 p
.if WD_DISABLE == 1
( x: U5 F( F3 [8 n2 k i! G LB wd_disable ;Branch to watchdog disable code
- a6 K% \; H8 S$ E5 H# Y; c: N .else0 f! S" N! j+ q a' w7 _4 X+ l
LB _c_int00 ;Branch to start of boot.asm in RTS library2 c) [% ]5 a6 i
.endif& j- z4 h( _( W7 X% ]
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;end codestart section0 I) C4 F& ]$ X. \, D* m# ~8 n0 h) n
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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。7 v* t. K- Z8 C) y- W
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那么我们就把这句话改掉。让他跳转到另一个地方去。
* i3 U: H- F# k2 X .sect "codestart"3 `2 }. c0 B8 D! {5 X
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code_start:! _* x6 }& l8 }2 B( P
.if WD_DISABLE == 1; M5 f7 A0 K3 T- {' z; ^$ J
LB wd_disable ;Branch to watchdog disable code8 b( m8 f1 o* C! l6 ?6 t/ P
.else
3 y9 Y+ Q; k M" T LB copy_sections ;Branch to copy_sections+ L1 w' _9 S( K: Z% K. \/ ~
.endif
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( ~8 U4 ^5 u8 L5 o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 L8 A' c$ ^1 m5 C6 ^6 v
;############################################################################
0 O5 T5 K8 V! K5 v8 \; V1 J* {;
0 [7 m+ b" D- {5 o' u# U' Y' s; FILE: DSP28xxx_SectionCopy_nonBIOS.asm
3 c/ w4 e. F$ c3 n" t) };7 X+ A0 `1 h5 @- _' b
; DESCRIPTION: Provides functionality for copying intialized sections from
2 @4 S m8 _7 a i9 o# M5 |; flash to ram at runtime before entering the _c_int00 startup
) E% B+ Y n6 ~* H. j4 x2 p7 w% L; routine3 Y1 R: O0 B, {! _) @
;############################################################################
. u2 Z8 l9 J B! i! U: p. r; Author: Tim Love; k5 j G- |0 ^' G1 ?
; Release Date: March 2008 * |$ U' Z6 j) @: s
;############################################################################; t; n; V' E8 g5 ^' S7 k
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.ref _c_int00 z! J8 Y4 ?7 ]5 T
.global copy_sections/ M9 [6 |; o6 r; c, c9 x
.global _cinit_loadstart, _cinit_runstart, _cinit_size2 W8 A( l! C2 J* m
.global _const_loadstart, _const_runstart, _const_size5 X. f! U6 S* E
.global _econst_loadstart, _econst_runstart, _econst_size
* ] a( u4 L( ?+ Y .global _pinit_loadstart, _pinit_runstart, _pinit_size
3 j. L9 Y, }5 R2 T/ h0 X) Q) r. p) A0 _ .global _switch_loadstart, _switch_runstart, _switch_size6 b2 W. _ F- M; v" c
.global _text_loadstart, _text_runstart, _text_size
' L& p9 G6 r q& s .global _cla_loadstart, _cla_runstart, _cla_size
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4 W. f+ g% D& I* N A***********************************************************************
/ b6 }8 i! l- v* N% @9 A* Function: copy_sections
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, O) `6 a1 C8 u5 ^* Description: Copies initialized sections from flash to ram" c4 T3 L4 Z* _0 ]
***********************************************************************. [- z1 K, V, ~7 W% u8 T
. L8 l3 [( J% q A .sect "copysections"4 v: ~$ g) I. u8 u) U
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copy_sections:# R* C! X( ^3 k. {4 I* K9 ~$ {
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MOVL XAR5,#_const_size ; Store Section Size in XAR5
& v r2 a1 h: _$ N9 B! U MOVL ACC,@XAR5 ; Move Section Size to ACC
- S; E# J# N2 Z: g( h% q# P MOVL XAR6,#_const_loadstart ; Store Load Starting Address in XAR6
F7 ^% q0 p e( S9 P& q MOVL XAR7,#_const_runstart ; Store Run Address in XAR7 }4 n5 U# p2 b) Y
LCR copy ; Branch to Copy) Y' `' [6 j+ N1 W x
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MOVL XAR5,#_econst_size ; Store Section Size in XAR5; m. m$ C9 I, h, _; W8 r3 s
MOVL ACC,@XAR5 ; Move Section Size to ACC
* `2 }& P5 w( T2 b2 p6 L" W MOVL XAR6,#_econst_loadstart ; Store Load Starting Address in XAR6) t0 ^8 g$ E" W" [$ M8 N0 w) H
MOVL XAR7,#_econst_runstart ; Store Run Address in XAR70 [& c' u4 F y$ _) N( N/ ^5 Y1 |
LCR copy ; Branch to Copy
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MOVL XAR5,#_pinit_size ; Store Section Size in XAR5+ M. h5 W: R1 \9 U
MOVL ACC,@XAR5 ; Move Section Size to ACC2 V- R6 J+ W/ W- X% H t- P
MOVL XAR6,#_pinit_loadstart ; Store Load Starting Address in XAR6
0 R4 L' ]) R' `9 x2 Y5 n- B2 ^& X; I* I MOVL XAR7,#_pinit_runstart ; Store Run Address in XAR7
$ U' f( o! E! `2 T6 w LCR copy ; Branch to Copy 4 q2 \7 Q* J5 z( a
! L; c4 \9 H/ d. V" H' V" M MOVL XAR5,#_switch_size ; Store Section Size in XAR5
+ c8 z# j0 u" X' \ MOVL ACC,@XAR5 ; Move Section Size to ACC
h0 q6 ^5 O- w* J3 E/ J6 [+ N MOVL XAR6,#_switch_loadstart ; Store Load Starting Address in XAR6
0 v/ \# f# S) \+ t+ `* S MOVL XAR7,#_switch_runstart ; Store Run Address in XAR7
- Y3 R8 V$ \, h6 R/ V1 U2 `2 K LCR copy ; Branch to Copy
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MOVL XAR5,#_text_size ; Store Section Size in XAR5
; Z; C4 ^1 _; Y$ I2 v MOVL ACC,@XAR5 ; Move Section Size to ACC. m8 P' Y5 e$ [' f. q% z- T
MOVL XAR6,#_text_loadstart ; Store Load Starting Address in XAR67 y+ a0 j, R: t9 H4 M8 O
MOVL XAR7,#_text_runstart ; Store Run Address in XAR7
% t( @% d- A" r* p, e6 N0 C LCR copy ; Branch to Copy2 Z! V& t0 K$ K ^0 A1 X
' a9 f9 o8 o) u- D8 k# m% ?) p MOVL XAR5,#_cinit_size ; Store Section Size in XAR5) j; L0 Z M/ w
MOVL ACC,@XAR5 ; Move Section Size to ACC) f1 C2 ]& T! n3 W- p0 N% W
MOVL XAR6,#_cinit_loadstart ; Store Load Starting Address in XAR6
, p: m. l2 S% o1 K( J z, r MOVL XAR7,#_cinit_runstart ; Store Run Address in XAR75 M7 C e- y$ i) d( Z8 t. B2 i
LCR copy ; Branch to Copy # {" h1 D* _& J; y8 g2 A1 p
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MOVL XAR5,#_cla_size ; Store Section Size in XAR5
) O U5 R0 x) v3 {; r" ]1 w( h# n MOVL ACC,@XAR5 ; Move Section Size to ACC# y, B* k& c, r8 o
MOVL XAR6,#_cla_loadstart ; Store Load Starting Address in XAR6- L& t/ {0 H, m# r+ c6 `+ M
MOVL XAR7,#_cla_runstart ; Store Run Address in XAR7' w9 E! u; d: ?6 U# t) f
LCR copy ; Branch to Copy9 K0 I3 n% k1 N# a; D) O
- c. |& d: D( t/ B3 r
LB _c_int00 ; Branch to start of boot.asm in RTS library
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' X: g) o1 e' p' ncopy: , i+ |; N/ M, }& c- n( O* J0 t! E$ a$ B
B return,EQ ; Return if ACC is Zero (No section to copy)
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+ d1 C# Z* A, Q& k- j9 H RPT AL ; Copy Section From Load Address to( s% Y1 _( Y6 a* g$ f9 j
|| PWRITE *XAR7, *XAR6++ ; Run Address
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* [2 _% v; n$ B- ]' l5 y) ]0 \return:
3 N6 |+ y9 M z& y( c# H8 j LRETR ; Return
2 C( ?3 d# F8 ?% C8 t, Q# r/ H- n0 X7 E8 h6 w8 w
.end9 @% O" o( s+ p# ^3 U2 V
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;//===========================================================================6 h$ n' l7 E" {3 ]
;// End of file.; _& [& A$ A3 }0 ~! u& ^, r
;//===========================================================================
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% C4 \ N1 C. Q5 N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。 Q L. j4 r; t6 B/ G6 D
然后所有的数据段都拷贝完了,在跳转会c_int00继续执行。
5 n, J# p# h) M这样就完成啦。是不是很简单。
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