theHeap
ff1
((MAXMEMHEAP / HDRSZ) * HDRSZ) - SMALLBLKHEAP - HDRSZ
SMALLBLKHEAP
0x0000
typedef uint8 halDataAlign_t;
typedef uint16 osalMemHdr_t;
#define SMALLBLKHEAP 232
#define HDRSZ ( (sizeof ( halDataAlign_t ) > sizeof( osalMemHdr_t )) ? \
sizeof ( halDataAlign_t ) : sizeof( osalMemHdr_t ) )
static halDataAlign_t _theHeap[ MAXMEMHEAP / sizeof( halDataAlign_t ) ];
static byte *theHeap = (byte *)_theHeap;
void osal_mem_init( void )
{
osalMemHdr_t *tmp;
#if ( OSALMEM_PROFILER )
osal_memset( theHeap, OSALMEM_INIT, MAXMEMHEAP );
#endif
// Setup a NULL block at the end of the heap for fast comparisons with zero.
tmp = (osalMemHdr_t *)theHeap + (MAXMEMHEAP / HDRSZ) - 1;
*tmp = 0;
// Setup a small-block bucket.
tmp = (osalMemHdr_t *)theHeap;
*tmp = SMALLBLKHEAP;
// Setup the wilderness.
tmp = (osalMemHdr_t *)theHeap + (SMALLBLKHEAP / HDRSZ);
*tmp = ((MAXMEMHEAP / HDRSZ) * HDRSZ) - SMALLBLKHEAP - HDRSZ;
#if ( OSALMEM_GUARD )
ready = OSALMEM_READY;
#endif
// Setup a NULL block that is never freed so that the small-block bucket
// is never coalesced with the wilderness.
ff1 = tmp;
ff2 = osal_mem_alloc( 0 );
ff1 = (osalMemHdr_t *)theHeap;
#if ( OSALMEM_METRICS )
/* Start with the small-block bucket and the wilderness - don't count the
* end-of-heap NULL block nor the end-of-small-block NULL block.
*/
blkCnt = blkFree = 2;
#endif
}
0x8002
ff2
((MAXMEMHEAP/ HDRSZ) * HDRSZ)-SMALLBLKHEAP - HDRSZ-2
void *osal_mem_alloc( uint16 size )
osalMemHdr_t
(size | OSALMEM_IN_USE)
（ Len = 2 bytes ）
memory buffer
( Len = size )
void *osal_mem_alloc( uint16 size )
@return void * - pointer to the heap allocation
OSAL
层学习研究
了解TI Zigbee OSAL 首先要了解OSAL层是如何使用内存的，内存是根据使用量大概估算定义的一个数组。详细描述
如下：
首先，该数据块尺寸必须小于32768字节。
内存申请分配后得到的内存首地址
内存分配后内存块头
里面包含内存长度和
内存占用标志
内存分配的实际区域
资源评论
不冻的港湾2012-08-13不错的资料，学习Zigbee的初学者可以借鉴。
