malloc函数动态分配

您好，

您分配的地址空间是多大的？应该是heap太小了。

Project -> Properties -> C/C++ Build -> Linker -> Basic Options -> Heap Size(-heap)

我现在就是一个简单的测试程序，malloc两个字节的空间，-heap  0x1000,在device simulator下可以运行通过，

但是将程序连到f2812运行时就跑飞了，这是为什么？还有我还想请教的是在2812上可以用malloc函数吗？因为在ccs3.1

中help,输入malloc回车就出现下面一段话，求解释：

The following table summarizes the TI C-Language Run-time Support Library functions that may be referenced by eXpressDSP-compliant algorithms.

Allowed or disallowed Category Typical functions in category Notes

allowed String functions strcpy, strchr, ? 1

allowed Memory-moving functions memcpy, memmove, memset, ... 2

allowed Integer math support _divi, _divu, _remi, _remu, ... 2

allowed Floating point support _addf, _subf, _mpyf, _divf, _addd, _subd, _mpyd, _divd, log10, cosh, ... 2, 3

allowed Conversion functions atoi, ftoi, itof, ... 2

disallowed Heap management functions malloc, free, realloc, alloc, ? 5

disallowed I/O functions printf, open, read, write, ? 4

disallowed misc. non-reentrant functions printf, sprintf, ctime, ... 5, 6

Notes:

1) Exceptions: strtok is not reentrant, and strdup allocates memory with malloc.

2) Some of these are issued by the compiler automatically for certain C operators.

3) The errno paradigm isn't reentrant. Thus, errno must not be used by eXpressDSP-compliant algorithms.

4) Algorithms are not allowed to perform I/O (except via DSP/BIOS APIs).

5) Algorithms must not allocate memory.

6) Algorithms must be reentrant and must, therefore, only reference reentrant functions.

See Also

Algorithm Standard rules topics

Use of DSP/BIOS API

2812上可以用malloc函数,既然在device simulator下可以运行通过，那我建议你用下面的例程试一下，在例程环境中使用malloc试试。

例程：

www.ti.com.cn/.../sprc097