DSP中的CMD文件是链接命令文件(Linker Command File),以.cmd为后缀。
在分析cmd文件之前,必需先了解
(1)DSP具体芯片的内存映射(Memory Map)
(2)知道点链接的知识,知道C程序中段的概念
(3)知道RAM,Flash等存储模块的区别
======================================================================
1. coff目标文件
======================================================================
coff是一种流行的二进制可执行文件格式,在CCS v5中扩展名为.out,可以直接
下载到芯片中。可执行文件包括段头、可执行代码、初始化数据、可重定位信息
和符号表字符串表等信息。
编译器处理段的过程为:
(1)把每个源文件都编译成独立目标文件(.obj),每个目标文件都有自己的段
(2)链接器将目标文件中相同段名的部分连接在一起,生成最终的coff可执行文件
CCS v5中的Compile Files完成功能(1),Build完成功能(2)。
======================================================================
2. TMS320C6713内存映射
======================================================================
======================================================================
3. 自定义代码段和数据段
======================================================================
// 将symbol分配到section name指示的数据段
#pragma DATA_SECTION(symbol, "section name");
// 将symbol分配到section name指示的代码段
#pragma CODE_SECTION(symbol, "section name");
常常结合结构体定义symbol,如下,
volatile struct Symbol symbol; // Symbol预先定义好的描述特定外设的结构
比如,对于C6713中的Timer0外设,做如下定义,
<span style="line-height: 1.5;">struct Timer0 { </span>
...
}
#pragma DATA_SECTION(C6713_Timer0, "C6713_Timer0_cmd");
volatile struct Timer0 C6713_Timer0;
"C6713_Timer0_cmd"将在cmd文件中分配空间。
表示,MEMORY和SECTIONS书写等。
<span style="line-height: 1.5;">MEMORY </span>
{
PAGE 0 :
PRAMH0 : origin = 0x3f8000, length = 0x001000
PAGE 1 :
/* SARAM */
RAMM0 : origin = 0x000000, length = 0x000400
RAMM1 : origin = 0x000400, length = 0x000400
<span style="line-height: 1.5;"> </span>
/* Peripheral Frame 0: */
DEV_EMU : origin = 0x000880, length = 0x000180
FLASH_REGS : origin = 0x000A80, length = 0x000060
CSM : origin = 0x000AE0, length = 0x000010
XINTF : 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
<span style="line-height: 1.5;"> </span>
/* Peripheral Frame 1: */
ECAN_A : origin = 0x006000, length = 0x000100
ECAN_AMBOX : origin = 0x006100, length = 0x000100
<span style="line-height: 1.5;"> </span>
/* Peripheral Frame 2: */
SYSTEM : origin = 0x007010, length = 0x000020
SPI_A : origin = 0x007040, length = 0x000010
SCI_A : origin = 0x007050, length = 0x000010
XINTRUPT : origin = 0x007070, length = 0x000010
GPIOMUX : origin = 0x0070C0, length = 0x000020
GPIODAT : origin = 0x0070E0, length = 0x000020
ADC : origin = 0x007100, length = 0x000020
EV_A : origin = 0x007400, length = 0x000040
EV_B : origin = 0x007500, length = 0x000040
SPI_B : origin = 0x007740, length = 0x000010
SCI_B : origin = 0x007750, length = 0x000010
MCBSP_A : origin = 0x007800, length = 0x000040
/* CSM Password Locations */
CSM_PWL : origin = 0x3F7FF8, length = 0x000008
<span style="line-height: 1.5;"> </span>
/* SARAM */
DRAMH0 : origin = 0x3f9000, length = 0x001000
}
SECTIONS
{
/* Allocate program areas: */
.reset : > PRAMH0, PAGE = 0
.text : > PRAMH0, PAGE = 0
.cinit : > PRAMH0, PAGE = 0
<span style="line-height: 1.5;"> </span>
/* Allocate data areas: */
.stack : > RAMM1, PAGE = 1
.bss : > DRAMH0, PAGE = 1
.ebss : > DRAMH0, PAGE = 1
.const : > DRAMH0, PAGE = 1
.econst : > DRAMH0, PAGE = 1
.sysmem : > DRAMH0, PAGE = 1
/* Allocate Peripheral Frame 0 Register Structures: */
DevEmuRegsFile : > DEV_EMU, PAGE = 1
FlashRegsFile : > FLASH_REGS, PAGE = 1
CsmRegsFile : > CSM, PAGE = 1
XintfRegsFile : > XINTF, PAGE = 1
CpuTimer0RegsFile : > CPU_TIMER0, PAGE = 1
CpuTimer1RegsFile : > CPU_TIMER1, PAGE = 1
CpuTimer2RegsFile : > CPU_TIMER2, PAGE = 1
PieCtrlRegsFile : > PIE_CTRL, PAGE = 1
PieVectTable : > PIE_VECT, PAGE = 1
<span style="line-height: 1.5;"> </span>
/* Allocate Peripheral Frame 2 Register Structures: */
ECanaRegsFile : > ECAN_A, PAGE = 1
ECanaMboxesFile : > ECAN_AMBOX PAGE = 1
/* Allocate Peripheral Frame 1 Register Structures: */
SysCtrlRegsFile : > SYSTEM, PAGE = 1
SpiaRegsFile : > SPI_A, PAGE = 1
SciaRegsFile : > SCI_A, PAGE = 1
XIntruptRegsFile : > XINTRUPT, PAGE = 1
GpioMuxRegsFile : > GPIOMUX, PAGE = 1
GpioDataRegsFile : > GPIODAT PAGE = 1
AdcRegsFile : > ADC, PAGE = 1
EvaRegsFile : > EV_A, PAGE = 1
EvbRegsFile : > EV_B, PAGE = 1
ScibRegsFile : > SCI_B, PAGE = 1
McbspaRegsFile : > MCBSP_A, PAGE = 1
/* CSM Password Locations */
CsmPwlFile : > CSM_PWL, PAGE = 1
}
一周热门 更多>