MSP432P401R全局变量突变

MSP432P401R.icf配置：

/*###ICF### Section handled by ICF editor, don't touch! ****/
/*-Editor annotation file-*/
/* IcfEditorFile="$TOOLKIT_DIR$\config\ide\IcfEditor\cortex_v1_1.xml" */
/*-Specials-*/
define symbol __ICFEDIT_intvec_start__ = 0x00000000;
/*-Memory Regions-*/
define symbol __ICFEDIT_region_IROM1_start__ = 0x00000000;
define symbol __ICFEDIT_region_IROM1_end__ = 0x0003FFFF;
define symbol __ICFEDIT_region_IROM2_start__ = 0x00200000;
define symbol __ICFEDIT_region_IROM2_end__ = 0x00203FFF;
define symbol __ICFEDIT_region_EROM1_start__ = 0x0;
define symbol __ICFEDIT_region_EROM1_end__ = 0x0;
define symbol __ICFEDIT_region_EROM2_start__ = 0x0;
define symbol __ICFEDIT_region_EROM2_end__ = 0x0;
define symbol __ICFEDIT_region_EROM3_start__ = 0x0;
define symbol __ICFEDIT_region_EROM3_end__ = 0x0;
define symbol __ICFEDIT_region_IRAM1_start__ = 0x20000000;
define symbol __ICFEDIT_region_IRAM1_end__ = 0x2000FFFF;
define symbol __ICFEDIT_region_IRAM2_start__ = 0x01000000;
define symbol __ICFEDIT_region_IRAM2_end__ = 0x0100FFFF;
define symbol __ICFEDIT_region_ERAM1_start__ = 0x0;
define symbol __ICFEDIT_region_ERAM1_end__ = 0x0;
define symbol __ICFEDIT_region_ERAM2_start__ = 0x0;
define symbol __ICFEDIT_region_ERAM2_end__ = 0x0;
define symbol __ICFEDIT_region_ERAM3_start__ = 0x0;
define symbol __ICFEDIT_region_ERAM3_end__ = 0x0;
/*-Sizes-*/
define symbol __ICFEDIT_size_cstack__ = 0x2000;
define symbol __ICFEDIT_size_heap__ = 0x4000;
/**** End of ICF editor section. ###ICF###*/

define memory mem with size = 4G;
define region IROM_region = mem:[from __ICFEDIT_region_IROM1_start__ to __ICFEDIT_region_IROM1_end__]
| mem:[from __ICFEDIT_region_IROM2_start__ to __ICFEDIT_region_IROM2_end__];
define region EROM_region = mem:[from __ICFEDIT_region_EROM1_start__ to __ICFEDIT_region_EROM1_end__]
| mem:[from __ICFEDIT_region_EROM2_start__ to __ICFEDIT_region_EROM2_end__]
| mem:[from __ICFEDIT_region_EROM3_start__ to __ICFEDIT_region_EROM3_end__];
define region IRAM_region = mem:[from __ICFEDIT_region_IRAM1_start__ to __ICFEDIT_region_IRAM1_end__]
| mem:[from __ICFEDIT_region_IRAM2_start__ to __ICFEDIT_region_IRAM2_end__];
define region ERAM_region = mem:[from __ICFEDIT_region_ERAM1_start__ to __ICFEDIT_region_ERAM1_end__]
| mem:[from __ICFEDIT_region_ERAM2_start__ to __ICFEDIT_region_ERAM2_end__]
| mem:[from __ICFEDIT_region_ERAM3_start__ to __ICFEDIT_region_ERAM3_end__];

define block CSTACK with alignment = 8, size = __ICFEDIT_size_cstack__ { };
define block HEAP with alignment = 8, size = __ICFEDIT_size_heap__ { };

do not initialize { section .noinit };
initialize by copy { readwrite };
if (isdefinedsymbol(__USE_DLIB_PERTHREAD))
{
// Required in a multi-threaded application
initialize by copy with packing = none { section __DLIB_PERTHREAD };
}

place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };

place in IROM_region { readonly };
place in EROM_region { readonly section application_specific_ro };
place in IRAM_region { readwrite, block CSTACK, block HEAP };
place in ERAM_region { readwrite section application_specific_rw };

EmptyMain.map编译输出：

*******************************************************************************
*** PLACEMENT SUMMARY
***

"A0": place at 0x00000000 { ro section .intvec };
"P1": place in [from 0x00000000 to 0x0003ffff] |
[from 0x00200000 to 0x00203fff] { ro };
define block CSTACK with size = 8K, alignment = 8 { };
define block HEAP with size = 16K, alignment = 8 { };
"P3": place in [from 0x01000000
to 0x0100ffff
repeat 2
displacement 0x1f000000] { rw, block CSTACK, block HEAP };
do not initialize { section .noinit };
initialize by copy { rw };

No sections matched the following patterns:

ro section application_specific_ro in "P2|P4"
rw section application_specific_rw in "P2|P4"

62 384 bytes of readonly code memory
95 673 bytes of readonly data memory
20 051 bytes of readwrite data memory

Errors: none
Warnings: 1

按照.map文件，我的程序与变量大小应该没有超过MSP432P401R的256Kflash和64KRAM，目前通过修改堆栈大小无法解决这个问题，部分全局变量在赋值后，程序运行后会被重新赋值另外的随机值，在指针或float型计算时发生的概率最大，编译环境IAR for ARM 8.22

user4974765：

回复 Susan Yang:

在专门一个.c文件里定义，并初始换：volatile unsigned char KeyState=0;，在.h文件extern volatile unsigned char KeyState;