IAR_STM32_CCM內存使用

在IAR中，硬件環境為STM32F464單片機，額外的CCM不能用DMA訪問，但可以作為內部額外擴充RAM使用

修改文件中的內容為：

define symbol __ICFEDIT_region_ROM_start__    = 0x08000000;
define symbol __ICFEDIT_region_ROM_end__      = 0x080FFFFF;
define symbol __ICFEDIT_region_RAM_start__    = 0x20000000;
define symbol __ICFEDIT_region_RAM_end__      = 0x2001FFFF;
define symbol __ICFEDIT_region_CCMRAM_start__ = 0x10000000;
define symbol __ICFEDIT_region_CCMRAM_end__   = 0x1000FFFF;
/*-Sizes-*/
define symbol __ICFEDIT_size_cstack__ = 0x400;
define symbol __ICFEDIT_size_heap__ = 0x800;
/**** End of ICF editor section. ###ICF###*/


define memory mem with size = 4G;    
define region ROM_region      = mem:[from __ICFEDIT_region_ROM_start__   to  
__ICFEDIT_region_ROM_end__];
define region RAM_region      = mem:[from __ICFEDIT_region_RAM_start__   to  
__ICFEDIT_region_RAM_end__];
define region CCMRAM_region   = mem:[from __ICFEDIT_region_CCMRAM_start__   to  
__ICFEDIT_region_CCMRAM_end__];

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

initialize by copy {readwrite};
do not initialize  { section .noinit };

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

place in ROM_region   { readonly };
place in CCMRAM_region { readwrite };    //內存分配CCM優先（除堆棧）
place in RAM_region   { block CSTACK, block HEAP };  //堆區和棧區設置在SRAM

要具設置某個文件生成在CCM區，place in CCMRAM_region { readwrite };修改為：

place in CCMRAM_region {readwrite object tasks.o,

                           readwrite object heap_4.o };

 

或者具體到內存中分配的類型（具體查看生成的map文件）修改為：

place in CCMRAM_region {section .bss object tasks.o,

                           section .bss object heap_4.o };

內存靈活配置，當然也可配置為（注意CCM區不能使用DMA）：

place in CCMRAM_region { block CSTACK, block HEAP };    //堆區和棧區設置在CCM

 place in RAM_region   { readwrite };  ///內存分配CCM優先（除堆棧）

/*###ICF### Section handled by ICF editor, don't touch! ****/
/*-Editor annotation file-*/
/* IcfEditorFile="$TOOLKIT_DIR$\config\ide\IcfEditor\cortex_v1_0.xml" */
/*-Specials-*/
define symbol __ICFEDIT_intvec_start__ = 0x08000000;
/*-Memory Regions-*/
define symbol __ICFEDIT_region_ROM_start__    = 0x08000000;
define symbol __ICFEDIT_region_ROM_end__      = 0x080FFFFF;
define symbol __ICFEDIT_region_RAM_start__    = 0x20000000;
define symbol __ICFEDIT_region_RAM_end__      = 0x2001FFFF;
define symbol __ICFEDIT_region_CCMRAM_start__ = 0x10000000;
define symbol __ICFEDIT_region_CCMRAM_end__   = 0x1000FFFF;
/*-Sizes-*/
define symbol __ICFEDIT_size_cstack__ = 0x800;
define symbol __ICFEDIT_size_heap__   = 0x18C00;
/**** End of ICF editor section. ###ICF###*/
define memory mem with size = 4G;
define region ROM_region   = mem:[from __ICFEDIT_region_ROM_start__   to __ICFEDIT_region_ROM_end__];
define region RAM_region   = mem:[from __ICFEDIT_region_RAM_start__   to __ICFEDIT_region_RAM_end__];
define region CCMRAM_region   = mem:[from __ICFEDIT_region_CCMRAM_start__   to __ICFEDIT_region_CCMRAM_end__];

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

initialize by copy { readwrite };
do not initialize  { section .noinit };

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

place in ROM_region   { readonly };
place in RAM_region   { readwrite,
                        block CSTACK, block HEAP };
place in CCMRAM_region{ readwrite  object heap_4.o,
                        readwrite  object tasks.o,
                        readwrite  object port.o,
                        readwrite  object cmsis_os.o,
                       };