TMS320F28335项目开发记录6
- 作者: 五速梦信息网
- 时间: 2026年03月05日 13:17
1.CMD文件的作用
CMD文件的作用就像仓库的货物摆放记录一样，为程序代码和数据分配指定的空间。
2.C语言生成的段C语言生成的段大致分为两大类：初始化和未初始化，已初始化的段含有真正的指令和数据，未初始化段仅仅是保留变量的地址空间。已初始化段通常放在程序空间，未初始化段通常放在数据空间。
已初始化段：
.text——C语言编译生成的汇编指令代码存放于此
.cinit——存放初始化的全局和静态变量
.const——字符串常量和const定义的全局和静态变量
.econst——字符串常量和far const定义的全局和静态变量
.print——全局构造器(C++)程序列表
.switch——存放switch语句产生的常数表格
以.const段为例：
const int a = 10; //注意必须是全局的 假设声明为局部const初始化变量，不会放在.const段，局部变量都是执行时放在.bss段中
char * p = “ABC”;
数组和结构体的初始值——是局部变量时。产生的是.const，假设是全局变量，产生的是.cinit
未初始化段：
.bss——为全局变量和局部变量保留的空间，程序上电时，.cinit空间中的数据复制出来并存放在.bss空间中
.ebss——为使用大寄存器模式时预留的全局和局部变量空间，程序上电时，.cinit空间中的数据复制出来并存放在.bss空间中
.stack——堆栈空间，主要用于函数传递变量或为局部变量分配空间
.system——为动态存储分配保留的空间(malloc)。假设有宏函数，此空间被占用
.esystem——为动态存储分配保留的空间(far malloc)。假设有far函数，此空间会被占用
3.自己定义段上面的都是官方预先定义好的。我们能够定义自己的段么？能够。使用例如以下语句:
#pragma CODE_SECTION(symbol, “section name”);
#pragma DATA_SECTION(symbol, “section name”);
symbol——符号。能够是函数名/变量名
section name——自己定义的段名
CODE_SECTION用来定义代码段
DATA_SECTION用来定义数据段
注意：
不能再函数体内声明#pragma；
必须在符号被定义和使用之前声明#pragma
样例：
#pragma DATA_SECTION(data, “data_name”);
char data[100];
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4.CMD文件在DSP28335project文件中（不用BIOS产生CMD文件），手写CMD文件一般有两个，RAM里调试时用的两个CMD文件分别为DSP2833x_Headers_nonBIOS.cmd和28335_RAM_lnk.cmd，烧写到flash里时用的两个CMD文件分别为DSP2833x_Headers_nonBIOS.cmd和F28335.cmd，当中DSP2833x_Headers_nonBIOS.cmd文件能够在全部project文件中通用。主要作用是把外设寄存器产生的数据段映射到相应的存储空间，能够跟DSP2833x_GlobalVariableDefs.c文件对比一下看看。
在我的上一篇文章中也有提到。
事实上我们也不须要具体的知道怎样编写cmd文件，能够照着原有的改动就能够了。
以下是官方28335_RAM_lnk.cmd,普通情况下直接用TI给的，不须要做改动就可以满足调试用，模式较固定，当然你也能够做对应的改动用到哪块RAM存储空间。在CMD文件中做对应的分配就可以。
MEMORY
{
PAGE 0 :
/* BEGIN is used for the ”boot to SARAM“ bootloader mode / BEGIN : origin = 0x000000, length = 0x000002 / Boot to M0 will go here /
RAMM0 : origin = 0x000050, length = 0x0003B0
RAML0 : origin = 0x008000, length = 0x001000
RAML1 : origin = 0x009000, length = 0x001000
RAML2 : origin = 0x00A000, length = 0x001000
RAML3 : origin = 0x00B000, length = 0x001000
ZONE7A : origin = 0x200000, length = 0x00FC00 / XINTF zone 7 - program space /
CSM_RSVD : origin = 0x33FF80, length = 0x000076 / Part of FLASHA. Program with all 0x0000 when CSM is in use. /
CSM_PWL : origin = 0x33FFF8, length = 0x000008 / Part of FLASHA. CSM password locations in FLASHA /
ADC_CAL : origin = 0x380080, length = 0x000009
RESET : origin = 0x3FFFC0, length = 0x000002
IQTABLES : origin = 0x3FE000, length = 0x000b50
IQTABLES2 : origin = 0x3FEB50, length = 0x00008c
FPUTABLES : origin = 0x3FEBDC, length = 0x0006A0
BOOTROM : origin = 0x3FF27C, length = 0x000D44 PAGE 1 :
/ BOOT_RSVD is used by the boot ROM for stack. /
/ This section is only reserved to keep the BOOT ROM from /
/ corrupting this area during the debug process / BOOT_RSVD : origin = 0x000002, length = 0x00004E / Part of M0, BOOT rom will use this for stack /
RAMM1 : origin = 0x000400, length = 0x000400 / on-chip RAM block M1 /
RAML4 : origin = 0x00C000, length = 0x001000
RAML5 : origin = 0x00D000, length = 0x001000
RAML6 : origin = 0x00E000, length = 0x001000
RAML7 : origin = 0x00F000, length = 0x001000
ZONE7B : origin = 0x20FC00, length = 0x000400 / XINTF zone 7 - data space /
} SECTIONS
{
/ Setup for ”boot to SARAM“ mode:
The codestart section (found in DSP28_CodeStartBranch.asm)<br/> re-directs execution to the start of user code. */<br/>codestart : > BEGIN, PAGE = 0
ramfuncs : > RAML0, PAGE = 0
.text : > RAML1, PAGE = 0
.cinit : > RAML0, PAGE = 0
.pinit : > RAML0, PAGE = 0
.switch : > RAML0, PAGE = 0 .stack : > RAMM1, PAGE = 1
.ebss : > RAML4, PAGE = 1
.econst : > RAML5, PAGE = 1
.esysmem : > RAMM1, PAGE = 1 IQmath : > RAML1, PAGE = 0
IQmathTables : > IQTABLES, PAGE = 0, TYPE = NOLOAD /* Uncomment the section below if calling the IQNexp() or IQexp()functions from the IQMath.lib library in order to utilize the<br/> relevant IQ Math table in Boot ROM (This saves space and Boot ROM<br/> is 1 wait-state). If this section is not uncommented, IQmathTables2<br/> will be loaded into other memory (SARAM, Flash, etc.) and will take<br/> up space, but 0 wait-state is possible.<br/>/
/
IQmathTables2 : > IQTABLES2, PAGE = 0, TYPE = NOLOAD
{ IQmath.lib<IQNexpTable.obj> (IQmathTablesRam) }
/ FPUmathTables : > FPUTABLES, PAGE = 0, TYPE = NOLOAD DMARAML4 : > RAML4, PAGE = 1
DMARAML5 : > RAML5, PAGE = 1
DMARAML6 : > RAML6, PAGE = 1
DMARAML7 : > RAML7, PAGE = 1 ZONE7DATA : > ZONE7B, PAGE = 1 .reset : > RESET, PAGE = 0, TYPE = DSECT / not used /
csm_rsvd : > CSM_RSVD PAGE = 0, TYPE = DSECT / not used for SARAM examples /
csmpasswds : > CSM_PWL PAGE = 0, TYPE = DSECT / not used for SARAM examples / / Allocate ADC_cal function (pre-programmed by factory into TI reserved memory) /
.adc_cal : load = ADC_CAL, PAGE = 0, TYPE = NOLOAD } /
//===========================================================================
// End of file.
//===========================================================================
/
以下是官方F28335.cmd；
编写用于flash烧写的F28335.cmd文件时相对来说较复杂些，依据不同的情况须要做一些改动。
1 不须要把部分代码copy到RAM里，普通情况不须要外扩RAM等时直接用TI的F28335.cmd就可以。
2 须要把部分代码从flash 拷贝到RAM里，如延时函数DSP2833x_usDelay.asm等。这时CMD文件须要做对应的改动，详细參考博文：http://blog.sina.com.cn/s/blog_762cf5f80101asmq.html
3 从时间开销方面考虑，须要把整个程序从flash拷贝到RAM里，这时程序及CMD文件都要做对应的改动。详细參考博文http://blog.sina.com.cn/s/blog_762cf5f80101apfx.html
MEMORY
{
PAGE 0: / Program Memory */
/* Memory (RAM/FLASH/OTP) blocks can be moved to PAGE1 for data allocation */ZONE0 : origin = 0x004000, length = 0x001000 /* XINTF zone 0 /
RAML0 : origin = 0x008000, length = 0x001000 / on-chip RAM block L0 /
RAML1 : origin = 0x009000, length = 0x001000 / on-chip RAM block L1 /
RAML2 : origin = 0x00A000, length = 0x001000 / on-chip RAM block L2 /
RAML3 : origin = 0x00B000, length = 0x001000 / on-chip RAM block L3 /
ZONE6 : origin = 0x0100000, length = 0x100000 / XINTF zone 6 /
ZONE7A : origin = 0x0200000, length = 0x00FC00 / XINTF zone 7 - program space /
FLASHH : origin = 0x300000, length = 0x008000 / on-chip FLASH /
FLASHG : origin = 0x308000, length = 0x008000 / on-chip FLASH /
FLASHF : origin = 0x310000, length = 0x008000 / on-chip FLASH /
FLASHE : origin = 0x318000, length = 0x008000 / on-chip FLASH /
FLASHD : origin = 0x320000, length = 0x008000 / on-chip FLASH /
FLASHC : origin = 0x328000, length = 0x008000 / on-chip FLASH /
FLASHA : origin = 0x338000, length = 0x007F80 / on-chip FLASH /
CSM_RSVD : origin = 0x33FF80, length = 0x000076 / Part of FLASHA. Program with all 0x0000 when CSM is in use. /
BEGIN : origin = 0x33FFF6, length = 0x000002 / Part of FLASHA. Used for ”boot to Flash“ bootloader mode. /
CSM_PWL : origin = 0x33FFF8, length = 0x000008 / Part of FLASHA. CSM password locations in FLASHA /
OTP : origin = 0x380400, length = 0x000400 / on-chip OTP /
ADC_CAL : origin = 0x380080, length = 0x000009 / ADC_cal function in Reserved memory / IQTABLES : origin = 0x3FE000, length = 0x000b50 / IQ Math Tables in Boot ROM /
IQTABLES2 : origin = 0x3FEB50, length = 0x00008c / IQ Math Tables in Boot ROM /
FPUTABLES : origin = 0x3FEBDC, length = 0x0006A0 / FPU Tables in Boot ROM /
ROM : origin = 0x3FF27C, length = 0x000D44 / Boot ROM /
RESET : origin = 0x3FFFC0, length = 0x000002 / part of boot ROM /
VECTORS : origin = 0x3FFFC2, length = 0x00003E / part of boot ROM / PAGE 1 : / Data Memory *//* Memory (RAM/FLASH/OTP) blocks can be moved to PAGE0 for program allocation */<br/> /* Registers remain on PAGE1 */BOOT_RSVD : origin = 0x000000, length = 0x000050 /* Part of M0, BOOT rom will use this for stack /
RAMM0 : origin = 0x000050, length = 0x0003B0 / on-chip RAM block M0 /
RAMM1 : origin = 0x000400, length = 0x000400 / on-chip RAM block M1 /
RAML4 : origin = 0x00C000, length = 0x001000 / on-chip RAM block L1 /
RAML5 : origin = 0x00D000, length = 0x001000 / on-chip RAM block L1 /
RAML6 : origin = 0x00E000, length = 0x001000 / on-chip RAM block L1 /
RAML7 : origin = 0x00F000, length = 0x001000 / on-chip RAM block L1 /
ZONE7B : origin = 0x20FC00, length = 0x000400 / XINTF zone 7 - data space /
FLASHB : origin = 0x330000, length = 0x008000 / on-chip FLASH /
} / Allocate sections to memory blocks.
Note:codestart user defined section in DSP28_CodeStartBranch.asm used to redirect code<br/> execution when booting to flash<br/> ramfuncs user defined section to store functions that will be copied from Flash into RAM<br/>/ SECTIONS
{ / Allocate program areas: */
.cinit : > FLASHA PAGE = 0
.pinit : > FLASHA, PAGE = 0
.text : > FLASHA PAGE = 0
codestart : > BEGIN PAGE = 0
ramfuncs : LOAD = FLASHD,RUN = RAML0,<br/> LOAD_START(_RamfuncsLoadStart),<br/> LOAD_END(_RamfuncsLoadEnd),<br/> RUN_START(_RamfuncsRunStart),<br/> PAGE = 0csmpasswds : > CSM_PWL PAGE = 0
csm_rsvd : > CSM_RSVD PAGE = 0 /* Allocate uninitalized data sections: /
.stack : > RAMM1 PAGE = 1
.ebss : > RAML4 PAGE = 1
.esysmem : > RAMM1 PAGE = 1 / Initalized sections go in Flash /
/ For SDFlash to program these, they must be allocated to page 0 /
.econst : > FLASHA PAGE = 0
.switch : > FLASHA PAGE = 0
/ Allocate IQ math areas: /
IQmath : > FLASHC PAGE = 0 / Math Code /
IQmathTables : > IQTABLES, PAGE = 0, TYPE = NOLOAD / Uncomment the section below if calling the IQNexp() or IQexp()functions from the IQMath.lib library in order to utilize the<br/> relevant IQ Math table in Boot ROM (This saves space and Boot ROM<br/> is 1 wait-state). If this section is not uncommented, IQmathTables2<br/> will be loaded into other memory (SARAM, Flash, etc.) and will take<br/> up space, but 0 wait-state is possible.<br/>/
/
IQmathTables2 : > IQTABLES2, PAGE = 0, TYPE = NOLOAD
{ IQmath.lib<IQNexpTable.obj> (IQmathTablesRam) }
/ FPUmathTables : > FPUTABLES, PAGE = 0, TYPE = NOLOAD / Allocate DMA-accessible RAM sections: /
DMARAML4 : > RAML4, PAGE = 1
DMARAML5 : > RAML5, PAGE = 1
DMARAML6 : > RAML6, PAGE = 1
DMARAML7 : > RAML7, PAGE = 1 / Allocate 0x400 of XINTF Zone 7 to storing data /
ZONE7DATA : > ZONE7B, PAGE = 1 / .reset is a standard section used by the compiler. It contains the /
/ the address of the start of _c_int00 for C Code. /
/ When using the boot ROM this section and the CPU vector /
/ table is not needed. Thus the default type is set here to /
/ DSECT /
.reset : > RESET, PAGE = 0, TYPE = DSECT
vectors : > VECTORS PAGE = 0, TYPE = DSECT / Allocate ADC_cal function (pre-programmed by factory into TI reserved memory) /
.adc_cal : load = ADC_CAL, PAGE = 0, TYPE = NOLOAD } /
//===========================================================================
// End of file.
//===========================================================================
*/
详细的project实例。以后会给出；
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