STM32 Freertos 添加 外部sram heap_5.c

1：添加外部SRAM 初始化：

2：添加heap_5.c;

3:初始化heap_5.c 外部堆栈；

/* Define the start address and size of the two RAM regions not used by the 
linker. */
#define RAM2_START_ADDRESS ( ( uint8_t * ) 0x68000000 )
#define RAM2_SIZE ( 1024 * 1024 )

/* Declare an array that will be part of the heap used by heap_5. The array will be 
placed in RAM1 by the linker. */
#define RAM1_HEAP_SIZE ( 20 * 1024 )
 
static uint8_t ucHeap[ RAM1_HEAP_SIZE ];
 
/* Create an array of HeapRegion_t definitions. Whereas in Listing 6 the first entry 
described all of RAM1, so heap_5 will have used all of RAM1, this time the first 
entry only describes the ucHeap array, so heap_5 will only use the part of RAM1 that 
contains the ucHeap array. The HeapRegion_t structures must still appear in start 
address order, with the structure that contains the lowest start address appearing 
first. */
 
const HeapRegion_t xHeapRegions[] =
{
    { ucHeap, RAM1_HEAP_SIZE },
    { RAM2_START_ADDRESS, RAM2_SIZE },
    { NULL, 0 } /* Marks the end of the array. */
};
4：修改内存大小

#define configSUPPORT_DYNAMIC_ALLOCATION        1                       //支持动态内存申请
#define configTOTAL_HEAP_SIZE                    ((size_t)(1044*1024))     //系统所有总的堆大小

5：测试相关数据： 可以正常申请内存