有时候我们希望FreeRTOSConfig.h文件中定义的heap空间可以采用不连续的内存区，比如我们希望可以将其定义在内部SRAM一部分，外部SRAM一部分，此时我们就可以采用heap_5动态内存管理方式。另外，heap_5动态内存管理是在heap_4的基础上实现的。
heap_5动态内存管理是通过函数vPortDefineHeapRegions进行初始化的，也就是说用户在创建任务FreeRTOS的内部资源前要优先级调用这个函数vPortDefineHeapRegions，否则是无法通过函数pvPortMalloc申请到动态内存的。
函数vPortDefineHeapRegions定义不同段的内存空间采用了下面这种结构体：
复制代码
typedef struct HeapRegion
{
/* Start address of a block of memory that will be part of the heap.*/
uint8_t *pucStartAddress;
/* Size of the block of memory. */
size_t xSizeInBytes;
} HeapRegion_t;
比如下面定义了两个内存块:
复制代码
/* Allocate two blocks of RAM for use by the heap. The first is a block of
0x10000 bytes starting from address 0x80000000, and the second a block of
0xa0000 bytes starting from address 0x90000000. The block starting at
0x80000000 has the lower start address so appears in the array fist. */
const HeapRegion_t xHeapRegions[] =
{
{ ( uint8_t * ) 0x80000000UL, 0x10000 },
{ ( uint8_t * ) 0x90000000UL, 0xa0000 },
{ NULL, 0 } /* Terminates the array. */
};
/* Pass the array into vPortDefineHeapRegions(). */
vPortDefineHeapRegions( xHeapRegions );
FreeRTOS的配置：
FreeRTOSConfig.h文件中的配置如下：
复制代码
/* Ensure stdint is only used by the compiler, and not the assembler. */
#if defined(__ICCARM__) || defined(__CC_ARM) || defined(__GNUC__)
#include
extern volatile uint32_t ulHighFrequencyTimerTicks;
#endif
#define configUSE_PREEMPTION 1
#define configUSE_IDLE_HOOK 0
#define configUSE_TICK_HOOK 0
#define configCPU_CLOCK_HZ ( ( unsigned long ) 72000000 )
#define configTICK_RATE_HZ ( ( TickType_t ) 1000 )
#define configMAX_PRIORITIES ( 5 )
#define configMINIMAL_STACK_SIZE ( ( unsigned short ) 128 )
#define configTOTAL_HEAP_SIZE ( ( size_t ) ( 17 * 1024 ) )
#define configMAX_TASK_NAME_LEN ( 16 )
#define configUSE_TRACE_FACILITY 1
#define configUSE_16_BIT_TICKS 0
#define configIDLE_SHOULD_YIELD 1
/* Run time and task stats gathering related definitions. */
#define configGENERATE_RUN_TIME_STATS 1
#define configUSE_STATS_FORMATTING_FUNCTIONS 1
#define portCONFIGURE_TIMER_FOR_RUN_TIME_STATS() (ulHighFrequencyTimerTicks = 0ul)
#define portGET_RUN_TIME_COUNTER_VALUE() ulHighFrequencyTimerTicks
//#define portALT_GET_RUN_TIME_COUNTER_VALUE 1
/* Co-routine definitions. */
#define configUSE_CO_ROUTINES 0
#define configMAX_CO_ROUTINE_PRIORITIES ( 2 )
/* Set the following definitions to 1 to include the API function, or zero
to exclude the API function. */
#define INCLUDE_vTaskPrioritySet 1
#define INCLUDE_uxTaskPriorityGet 1
#define INCLUDE_vTaskDelete 1
#define INCLUDE_vTaskCleanUpResources 0
#define INCLUDE_vTaskSuspend 1
#define INCLUDE_vTaskDelayUntil 1
#define INCLUDE_vTaskDelay 1
/* Cortex-M specific definitions. */
#ifdef __NVIC_PRIO_BITS
/* __BVIC_PRIO_BITS will be specified when CMSIS is being used. */
#define configPRIO_BITS __NVIC_PRIO_BITS
#else
#define configPRIO_BITS 4 /* 15 priority levels */
#endif
/* The lowest interrupt priority that can be used in a call to a "set priority"
function. */
#define configLIBRARY_LOWEST_INTERRUPT_PRIORITY 0x0f
/* The highest interrupt priority that can be used by any interrupt service
routine that makes calls to interrupt safe FreeRTOS API functions. DO NOT CALL
INTERRUPT SAFE FREERTOS API FUNCTIONS FROM ANY INTERRUPT THAT HAS A HIGHER
PRIORITY THAN THIS! (higher priorities are lower numeric values. */
#define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 0x01
2
/6 
工商网监
湘ICP备2023018690号
10146
淘帖
2383
发表评论
赞
回复
