原创 DSP开发之CMD文件配置问题总结

 2011-6-8 09:31  6828 11 11 分类: 处理器与DSP

（1）程序烧写到DSP片内FLASH内后，运行正常，串口发送字符正常。断开仿真器，重新下电，上电后，串口发送字符乱码。

问题分析：CMD文件配置问题，导致关键参数配置到内部RAM中去，掉电后丢失。

问题原因：CMD文件中，econst: > RAML0L3, PAGE = 1，配制成了RAM，导致掉电后上电串口发送乱码。更改为.econst: > FLASH, PAGE = 0后，程序运行正常，串口发送字符正常。

.econst：是在使用大存储器模式时使用的，包括字符串，声明，以及被明确初始化过的全局变量和静态变量，可以放在数据页得任何地方。

CMD文件如下：

MEMORY
{
PAGE 0:
    BEGINRAM: origin=0x0, length=0x2
    RAMM0: origin=0x2, length=0x3fe
    OTP: origin=0x380400, length=0x400
    FLASH: origin=0x300000, length=0x3fff6
    BEGINFLASH: origin=0x33fff6, length=0x2
    CSM_PWL: origin=0x3f7ff8, length=0x8
    IQTABLES: origin=0x3fe000, length=0xb50
    IQTABLES2: origin=0x3feb50, length=0x8c
    FPUTABLES: origin=0x3febdc, length=0x6a0
    ROM: origin=0x3ff27c, length=0xd44
    RESET: origin=0x3fffc0, length=0x2
    VECTORS: origin=0x3fffc2, length=0x3e
    RAML4L7: origin=0xc000, length=0x4000
    ADC_CAL: origin=0x380080, length=0x9
PAGE 1:
    RAML0L3: origin=0x8000, length=0x4000
    RAMM1: origin=0x400, length=0x400
}

SECTIONS
{
    .vectors: load = 0x000000000
    .text: > FLASH, PAGE = 0
    .switch: > FLASH, PAGE = 0
    .bss: > RAML0L3, PAGE = 1
    .ebss: > RAML0L3, PAGE = 1
    .far: > RAML0L3, PAGE = 1
    .cinit: > FLASH, PAGE = 0
    .pinit: > FLASH, PAGE = 0
    .const: > RAML0L3, PAGE = 1
    .econst: > FLASH, PAGE = 0
    .reset: > RESET, PAGE = 0, TYPE = DSECT
    .data: > RAML0L3, PAGE = 1
    .cio: > RAML0L3, PAGE = 1
    .sysmem: > RAML0L3, PAGE = 1
    .esysmem:> RAML0L3, PAGE = 1
    .stack: > RAMM1, PAGE = 1
    .rtdx_text: > FLASH, PAGE = 0
    .rtdx_data: > RAML0L3, PAGE = 1
    IQmath: > FLASH, PAGE = 0
    codestart: > BEGINFLASH, PAGE = 0
    csmpasswds: > CSM_PWL, PAGE = 0
    csm_rsvd: > RAMM0, PAGE = 0
    ramfuncs: > FLASH, PAGE = 0
    .adc_cal: > ADC_CAL, PAGE = 0 , TYPE = NOLOAD
    IQmathTables: > FLASH, PAGE = 0 , TYPE = NOLOAD
    IQmathTables2: > FLASH, PAGE = 0 , TYPE = NOLOAD
    FPUmathTables: > FLASH, PAGE = 0 , TYPE = NOLOAD
}