F2812的CMD文件的编写CMD文件里包含三部分内容：1)输入／输出定义：.obj文件：链接器要链接的目标文件;.lib文件：链接器要链接的库文件;.map文件：链接器生成的交叉索引文件;.out文件：链接器生成的可执行代码;链接器选项2)MEMORY命令：描述系统实际的硬件资源3)SECTIONS命令：描述“段”如何定位F2812的CMD文件只包含后两部分，现对它的编写做一下总结：（一）用于调试时用，取名为SRAM.CMD（二）用于烧写到FLASH中时用，取名为FLASH.CMDFLASH.CMD与SRAM.CMD基本一样，只是有两处改动：一是MEMORY中将你的程序代码部分映射到FLASH空间里；二是在SECTIONS中添加一个用户定义的起始段，起始段的代码如下：//User Defined Sections , Used by file DSP28_CodeStartBranch.asmcodestart : > BEGIN, PAGE = 0其中DSP28_CodeStartBranch.asm中的关键代码为：.ref _c_int00.sect “codestart”Code_start:LB _c_int00.end这里有个比较标准的F2812的CMD文件，可以供大家借鉴使用：MEMORY{sPAGE 0:ZONE0 : origin = 0x002000, length = 0x002000ZONE1 : origin = 0x004000, length = 0x002000RAML0 : origin = 0x008000, length = 0x001000ZONE2 : origin = 0x080000, length = 0x080000ZONE6 : origin = 0x100000, length = 0x080000OTP: origin = 0x3D7800, length = 0x000800FLASHJ : origin = 0x3D8000, length = 0x002000FLASHI : origin = 0x3DA000, length = 0x002000FLASHH : origin = 0x3DC000, length = 0x004000FLASHG : origin = 0x3E0000, length = 0x004000FLASHF : origin = 0x3E4000, length = 0x004000FLASHE : origin = 0x3E8000, length = 0x004000FLASHD : origin = 0x3EC000, length = 0x004000FLASHC : origin = 0x3F0000, length = 0x004000 FLASHA: origin = 0x3F6000, length = 0x002000 BEGIN_H0 : origin = 0x3F8000, length = 0x000002 BEGIN_FLASH : origin = 0x3F7FF6, length = 0x000002 PRAMH0 : origin = 0x3F8002, length = 0x001FFE ZONE7 : origin = 0x3FC000, length = 0x003FC0 ROM : origin = 0x3FF000, length = 0x000FC0 RESET : origin = 0x3FFFC0, length = 0x000002 VECTORS : origin = 0x3FFFC2, length = 0x00003E PAGE 1 :R AMM0 : origin = 0x000000, length = 0x000400 RAMM1 : origin = 0x000400, length = 0x000400DEV_EMU : origin = 0x000880, length = 0x000180 FLASH_REGS : origin = 0x000A80, length = 0x000060 CSM : origin = 0x000AE0, length = 0x000010XINTF : origin = 0x000B20, length = 0x000020 CPU_TIMER0 : origin = 0x000C00, length = 0x000008 CPU_TIMER1 : origin = 0x000C08, length = 0x000008 CPU_TIMER2 : origin = 0x000C10, length = 0x000008 PIE_CTRL : origin = 0x000CE0, length = 0x000020 PIE_VECT : origin = 0x000D00, length = 0x000100 ECAN_A: origin = 0x006000, length = 0x000100 ECAN_AMBOX : origin = 0x006100, length = 0x000100SYSTEM : origin = 0x007010, length = 0x000020 SPI_A: origin = 0x007040, length = 0x000010SCI_A: origin = 0x007050, length = 0x000010 XINTRUPT : origin = 0x007070, length = 0x000010 GPIOMUX : origin = 0x0070C0, length = 0x000020 GPIODA T : origin = 0x0070E0, length = 0x000020 ADC : origin = 0x007100, length = 0x000020EV_A: origin = 0x007400, length = 0x000040EV_B : origin = 0x007500, length = 0x000040SCI_B : origin = 0x007750, length = 0x000010 MCBSP_A: origin = 0x007800, length = 0x000040RAML1 : origin = 0x009000, length = 0x001000 FLASHB : origin = 0x3F4000, length = 0x002000 CSM_PWL : origin = 0x3F7FF8, length = 0x000008 DRAMH0 : origin = 0x3f9000, length = 0x001000}SECTIONS{.text : > PRAMH0, PAGE = 0 包括所有的可执行代码和常数.cinit : > PRAMH0, PAGE = 0 包括初始化的变量和常量表.stack : > RAMM1, PAGE = 1.buss : > RAMM0, PAGE = 1.ebss : > RAMM0, PAGE = 1.const : > RAMM0, PAGE = 1.econst : > RAMM0, PAGE = 1.sysmem : > RAMM1, PAGE = 1.reset : > RESET, PAGE = 0, TYPE = DSECT // 复位中断向量表//Peripheral Frame 0 Register StructuresDevEmuRegsFile : > DEV_EMU, PAGE = 1FlashRegsFile : > FLASH_REGS, PAGE = 1CsmRegsFile : > CSM, PAGE = 1XintfRegsFile : > XINTF, PAGE = 1CpuTimer0RegsFile : > CPU_TIMER0, PAGE = 1PieCtrlRegsFile : > PIE_CTRL, PAGE = 1PieV ectTable : > PIE_VECT, PAGE = 1//Peripheral Frame 1 Register StructuresSysCtrlRegsFile : > SYSTEM, PAGE = 1SpiaRegsFile : > SPI_A, PAGE = 1SciaRegsFile : > SCI_A, PAGE = 1XIntruptRegsFile : > XINTRUPT, PAGE = 1GpioMuxRegsFile : > GPIOMUX, PAGE = 1GpioDataRegsFile : > GPIODA T PAGE = 1AdcRegsFile : > ADC, PAGE = 1EvaRegsFile : > EV_A, PAGE = 1EvbRegsFile : > EV_B, PAGE = 1ScibRegsFile : > SCI_B, PAGE = 1McbspaRegsFile : > MCBSP_A, PAGE = 1//Peripheral Frame 2 Register StructuresECanaRegsFile : > ECAN_A, PAGE = 1ECanaMboxesFile : > ECAN_AMBOX PAGE = 1//Code Security Password LocationsCsmPwlFile : > CSM_PWL, PAGE = 1}（三）SECTIONS中段的含义与用户自定义段的方法1、各个段的含义此外还有一些段的含义如下（这仅是我见过的，有漏下的还请提示，大家一起学习）：.reset 复位中断向量表.vectors 中断向量表.data 已初始化数据，常数数据（比如对变量的初始化数据）.pvecs 外围模块中断向量表.ref 引用外部定义的变量或函数名.global 引用全局变量或函数.space 定义要保留的空间.def 定义变量，与#define功能相同.end 段的结束标识.sect 用户自定义的已初始化段.asect 比.sect多了绝对地址定位功能，一般不用.usect 用户自定义的未初始化段已初始化的段：.text, .cinit, .const, .econst, .pinit, .switch.text:所有可以执行的代码和常量.cinit:全局变量和静态变量的C初始化记录.const:包含字符串常量和初始化的全局变量和静态变量(由const)的初始化和说明.econst:包含字符串常量和初始化的全局变量和静态变量(由far const)的初始化和说明.pinit:全局构造器(C++)程序列表.switch:包含转换语气声明的列表非初始化的段：.bss, .ebss, .stack, .sysmem, .esysmem(更好的理解就是，这些段就是存储空间而已)..bss:为全局变量和局部变量保留的空间，在程序上电时，cinit空间中的数据复制出来并存储在.bss空间中.ebss:为使用大寄存器模式时的全局变量和静态变量预留的空间，在程序上电时，cinit空间中的数据复制出来并存储在.ebss中.stack:为系统堆栈保留的空间，主要用于和函数传递变量或为局部变量分配空间.sysmem:为动态存储分配保留的空间。