关于HeapMemParams.shareAddr的赋值问题。

rui sun4

Intellectual 450 points

Other Parts Discussed in Thread: SYSBIOS

HeapMemParams.shareAddr的类型在定义中为Ptr类型。

1.我的理解为该变量可以定义在shareregion中建立Heap的起始地址，这样理解对么？？

2.如果是这样理解话，我在XDC中定义的ShareMem的起始地址为0x00C00000。但是打断点显示为0x008002F8。这是为什么呢？？

3.我在C语言程序中定义了HeapMemParams.shareAddr=0x00C00000，但是编译报错，显示它是Ptr类型，无法用int值赋值，那该如何赋值呢？？

4.shareregionID和HeapMemParams.shareAddr之间的区别，是不是在XDC中定义了shareregion，再定义了regionID，就可以不用定义HeapMemParams.shareAddr?

尤其是两个Heap共用一个sharemem的情况。

谢谢能够帮我解答。

9 年多前

0 Andy Yin 9 年多前

TI__Guru 61135 points

你说的是在sysbios中使用HeapMem创建heap么？你使用的sysbios是什么版本？

关于heapMem有下面的结构体定义，我没有看到你说的shareAddr成员定义。

/* Params */
struct ti_sysbios_heaps_HeapMem_Params {
size_t __size;
const void *__self;
void *__fxns;
xdc_runtime_IInstance_Params *instance;
xdc_SizeT minBlockAlign;
xdc_Ptr buf;
xdc_runtime_Memory_Size size;
xdc_runtime_IInstance_Params __iprms;
};

0 rui sun4 9 年多前回复 Andy Yin

Intellectual 450 points

你好。我在heapMem的头文件中找到这段的定义：

typedef struct HeapMemMP_Params {
    String name;
    /*!< Name of this instance.
     *
     * The name (if not NULL) must be unique among all HeapMemMP
     * instances in the entire system. When creating a new
     * heap, it is necessary to supply an instance name.
     *
     * The name does not have to be persistent. The supplied string is copied
     * into persistent memory.
     */

    UInt16 regionId;
    /*!< Shared region ID
     *
     * The index corresponding to the shared region from which shared memory
     * will be allocated.
     */

    /*! @cond */
    Ptr sharedAddr;
    /*!< Physical address of the shared memory
     *
     * This value can be left as 'null' unless it is required to place the
     * heap at a specific location in shared memory. If sharedAddr is null,
     * then shared memory for a new instance will be allocated from the
     * heap belonging to the region identified by
     * #HeapMemMP_Params::regionId.
     */
    /*! @endcond */

    SizeT sharedBufSize;
    /*!< Size of shared buffer
     *
     * This is the size of the buffer to be used in the HeapMemMP instance.
     * The actual buffer size in the created instance might actually be less
     * than the value supplied in 'sharedBufSize' because of alignment
     * constraints.
     *
     * It is important to note that the total amount of shared memory required
     * for a HeapMemMP instance will be greater than the size supplied here.
     * Additional space will be consumed by shared instance attributes and
     * alignment-related padding.
     */

    GateMP_Handle gate;
    /*!< GateMP used for critical region management of the shared memory
     *
     * Using the default value of NULL will result in use of the GateMP
     * system gate for context protection.
     */

} HeapMemMP_Params;

其中有Ptr sharedAddr的定义。但是我直接给它赋值0x0C000000，显示int型无法赋值给它。那我该如何处理呢？？

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