ZigBee学习笔记_osal_nv_init()

新年过完了，又可以继续学习了，进度好慢那感觉，今天看哈osal_nv_init()函数，代码很简单如下，

void osal_nv_init( void *p )
{
  (void)p;  // Suppress Lint warning.
  (void)initNV();  // Always returns TRUE after pages have been erased.
}

static uint8 initNV( void )
{
  osalNvPgHdr_t pgHdr;
  uint8 oldPg = OSAL_NV_PAGE_NULL;
  uint8 newPg = OSAL_NV_PAGE_NULL;
  uint8 findDups = FALSE;
  uint8 pg;
 
  pgRes = OSAL_NV_PAGE_NULL;
 
  for ( pg = OSAL_NV_PAGE_BEG; pg <= OSAL_NV_PAGE_END; pg++ )
  {
    HalFlashRead(pg, OSAL_NV_PAGE_HDR_OFFSET, (uint8 *)(&pgHdr), OSAL_NV_HDR_SIZE);
 
    if ( pgHdr.active == OSAL_NV_ERASED_ID )
    {
      if ( pgRes == OSAL_NV_PAGE_NULL )
      {
        pgRes = pg;
      }
      else
      {
        setPageUse( pg, TRUE );
      }
    }
    else  // Page is active.
    {
      // If the page is not yet in use, it is the tgt of items from an xfer.
      if ( pgHdr.inUse == OSAL_NV_ERASED_ID )
      {
        newPg = pg;
      }
      // An Xfer from this page was in progress.
      else if ( pgHdr.xfer != OSAL_NV_ERASED_ID )
      {
        oldPg = pg;
      }
    }
 
    // Calculate page offset and lost bytes - any "old" item triggers an N^2 re-scan from start.
    if ( initPage( pg, OSAL_NV_ITEM_NULL, findDups ) != OSAL_NV_ITEM_NULL )
    {
      findDups = TRUE;
      pg = OSAL_NV_PAGE_BEG-1;
      continue;
    }
  }  // for ( pg = OSAL_NV_PAGE_BEG; pg <= OSAL_NV_PAGE_END; pg++ )
 
  /* First the old page is erased, and then the new page is put into use.
   * So if a transfer was in progress, the new page will always not yet be
   * marked as in use, since that is the last step to ending a transfer.
   */
  if ( newPg != OSAL_NV_PAGE_NULL )
  {
    /* If there is already a fallow page reserved, keep it and put the newPg in use.
     * An unfinished compaction will finish to the new reserve page and the old page
     * will be erased and reserved.
     */
    if ( pgRes != OSAL_NV_PAGE_NULL )
    {
      setPageUse( newPg, TRUE );
    }
    /* If setting old page to 'xfer' failed or board reset before it was effected, there is no way
     * to know which page was the 'old page' - so just reset all NV pages to start clean.
     */
    else if ( oldPg != OSAL_N