串口中断出现错误

1万 · 2016-7-24 19:41

在以前别人做的DSP程序上扩展功能，主要是串口中断和定时器中断，中断设置确定没有问题，由于功能需要，主程序中switch语句和if语句较多，功能没有全部实现时，使用编译器的1级优化，勾选优化代码大小，程序正常运行，但是使用更高级别的优化时，串口中断就出现错误

1万 · 2016-7-24 19:42

不用高级优化呢

1万 · 2016-7-24 19:44

依然采用1级优化，编译结束后出现program will not fit it available！的错误

1万 · 2016-7-24 19:45

CMD文件？

1万 · 2016-7-24 19:45

MEMORY
{
PAGE 0: /* Program Memory */
ZONE0  : origin = 0x002000, length = 0x002000    /* XINTF zone 0 */
ZONE1  : origin = 0x004000, length = 0x002000    /* XINTF zone 1 */
ZONE2  : origin = 0x080000, length = 0x080000    /* XINTF zone 2 */
ZONE6  : origin = 0x100000, length = 0x080000    /* XINTF zone 6 */
OTP  : origin = 0x3D7800, length = 0x000800    /* on-chip OTP */
FLASHD  : origin = 0x3EC000, length = 0x004000    /* on-chip FLASH */
FLASHC  : origin = 0x3F0000, length = 0x004000    /* on-chip FLASH */
FLASHB  : origin = 0x3F4000, length = 0x002000    /* on-chip FLASH */
FLASHA  : origin = 0x3F6000, length = 0x001F80    /* on-chip FLASH */
CSM_RSVD : origin = 0x3F7F80, length = 0x000076    /* Part of FLASHA.  Program with all 0x0000 when CSM is in use. */
BEGIN  : origin = 0x3F7FF6, length = 0x000002    /* Part of FLASHA.  Used for "boot to Flash" bootloader mode. */
CSM_PWL  : origin = 0x3F7FF8, length = 0x000008    /* Part of FLASHA.  CSM password locations in FLASHA */
RAMH0  : origin = 0x3F8000, length = 0x002000    /* on-chip RAM block H0 */
RAML0  : origin = 0x008000, length = 0x001000    /* on-chip RAM block L1 */
/*ZONE7  : origin = 0x3FC000, length = 0x003FC0    // XINTF zone 7 available if MP/MCn=1*/
ROM  : origin = 0x3FF000, length = 0x000FC0    /* Boot ROM available if MP/MCn=0 */
RESET  : origin = 0x3FFFC0, length = 0x000002    /* part of boot ROM (MP/MCn=0) or XINTF zone 7 (MP/MCn=1) */
VECTORS  : origin = 0x3FFFC2, length = 0x00003E    /* part of boot ROM (MP/MCn=0) or XINTF zone 7 (MP/MCn=1) */
PAGE 1 : /* Data Memory */
BOOT_RSVD : origin = 0x000000, length = 0x000080    /* Part of M0, BOOT rom will use this for stack */
RAMM0  : origin = 0x000080, length = 0x000380    /* on-chip RAM block M0 */
RAMM1  : origin = 0x000400, length = 0x000400    /* on-chip RAM block M1 */
RAML1  : origin = 0x009000, length = 0x001000    /* on-chip RAM block L1 */
FLASHJ  : origin = 0x3D8000, length = 0x002000    /* on-chip FLASH */
FLASHI  : origin = 0x3DA000, length = 0x002000    /* on-chip FLASH */
FLASHH  : origin = 0x3DC000, length = 0x004000    /* on-chip FLASH */
FLASHG  : origin = 0x3E0000, length = 0x004000    /* on-chip FLASH */
FLASHF  : origin = 0x3E4000, length = 0x004000    /* on-chip FLASH */
FLASHE  : origin = 0x3E8000, length = 0x004000    /* on-chip FLASH */
}

SECTIONS
{
/*** Code Security Password Locations ***/
csmpasswds : > CSM_PWL    PAGE = 0  /* Used by file CSMPasswords.asm */
csm_rsvd : > CSM_RSVD    PAGE = 0  /* Used by file CSMPasswords.asm */
/*** User Defined Sections ***/
codestart : > BEGIN,  PAGE = 0       /* Used by file CodeStartBranch.asm */
wddisable : > FLASHA,  PAGE = 0  /* Used by file CodeStartBranch.asm */
copysections : > FLASHA,  PAGE = 0  /* Used by file SectionCopy.asm */
.reset  : > RESET,    PAGE = 0, TYPE = DSECT
vectors  : > VECTORS    PAGE = 0, TYPE = DSECT
/*** Uninitialized Sections ***/
.stack  : > RAMM1       PAGE = 1
.ebss  : > RAML1       PAGE = 1
.esysmem : > RAML1       PAGE = 1
.sysmem  : > RAML1       PAGE = 1
/*** Initialized Sections ***/
ramfuncs : LOAD = FLASHC,
   RUN = RAML0,
   LOAD_START(_RamfuncsLoadStart),
   LOAD_END(_RamfuncsLoadEnd),
   RUN_START(_RamfuncsRunStart),
   PAGE = 0
.text  : LOAD = FLASHC, PAGE = 0
   RUN = RAMH0, PAGE = 0
   LOAD_START(_text_loadstart),
   RUN_START(_text_runstart),
   SIZE(_text_size)
.cinit  : LOAD = FLASHC, PAGE = 0
   RUN = RAMH0, PAGE = 0
   LOAD_START(_cinit_loadstart),
   RUN_START(_cinit_runstart),
   SIZE(_cinit_size)
.pinit  : LOAD = FLASHC, PAGE = 0
   RUN = RAMH0, PAGE = 0
   LOAD_START(_pinit_loadstart),
   RUN_START(_pinit_runstart),
   SIZE(_pinit_size)
.switch : LOAD = FLASHC, PAGE = 0
               RUN = RAMH0, PAGE = 0
               LOAD_START(_switch_loadstart),
               RUN_START(_switch_runstart),
   SIZE(_switch_size)
/*.const : LOAD = FLASHJ, PAGE = 0
               RUN = RAML0L1, PAGE = 0
               LOAD_START(_const_loadstart),
               RUN_START(_const_runstart),
   SIZE(_const_size)*/
.econst : LOAD = FLASHJ, PAGE = 1
               RUN = RAML1, PAGE = 1
               LOAD_START(_econst_loadstart),
               RUN_START(_econst_runstart),
   SIZE(_econst_size)
/*** IQmath ***/
IQmath : LOAD = FLASHC, PAGE = 0
               RUN = RAMH0, PAGE = 0
               LOAD_START(_IQmath_loadstart),
               RUN_START(_IQmath_runstart),
   SIZE(_IQmath_size)
IQmathTables : > ROM PAGE = 0, TYPE = NOLOAD /* Math Tables In ROM */
IQmathTablesRam : LOAD = FLASHJ, PAGE = 1
               RUN = RAML1, PAGE = 1
               LOAD_START(_IQmathTablesRam_loadstart),
               RUN_START(_IQmathTablesRam_runstart),
   SIZE(_IQmathTablesRam_size)
.cio : > FLASHA,  PAGE = 0
}

1万 · 2016-7-24 19:46

个人比较喜欢高优先级的优化.

2万 · 2016-7-24 19:47

但是使用更高级别的优化时，串口中断就出现错误

2万 · 2016-7-24 19:48

这是因为代码优化会打乱指令执行顺序, 优化存储器访问等.

1万 · 2016-7-24 19:49

啥意思？

1万 · 2016-7-24 19:50

比如使用 volitale 强制不要优化

1万 · 2016-7-24 19:51

O3是最大的优化级别，特别对循环试图进行软件流水。优化后一些不常用的中间变量将被释放掉，优化前中间变量被定义在L2缓存里，优化后直接分配在了CPU内部寄存器里，所以这些变量将不能被看到。

1万 · 2016-7-24 19:56

建议买一本DSP优化方面的书，一般讲得很清楚

1万 · 2016-7-24 19:56

很正常，采用O3优化后，少些代码会不正常，我也遇见过好几次，把C代码的方法改一下，再采用FULLL－DEBUG模式回过去看看（MIX模式）汇编确认一下。

1万 · 2016-7-24 19:58

我跑的是一个视频采集和压缩的程序，压缩用的是JPEG压缩算法，程序在不选－O2
或者－o3选项优化的时候，可以正常工作，而且比较稳定，但使用－o2或者－o3选项后，程序工作不稳定，会出错。而且程序在使用－o2或者－o3选项后，很多变量被优化掉了，有些语句的顺序也被调整了，调试起来也不是很方便，还需要继续研究。