Esempi in C++ (Cpp) per SPIFFS_HAL_READ

Esempio n. 1

File: spiffs_cache.c Progetto: SkySparky/spiffs

// reads from spi flash or the cache
s32_t spiffs_phys_rd(
    spiffs *fs,
    u8_t op,
    spiffs_file fh,
    u32_t addr,
    u32_t len,
    u8_t *dst) {
  (void)fh;
  s32_t res = SPIFFS_OK;
  spiffs_cache *cache = spiffs_get_cache(fs);
  spiffs_cache_page *cp =  spiffs_cache_page_get(fs, SPIFFS_PADDR_TO_PAGE(fs, addr));
  cache->last_access++;
  if (cp) {
    // we've already got one, you see
#if SPIFFS_CACHE_STATS
    fs->cache_hits++;
#endif
    cp->last_access = cache->last_access;
    u8_t *mem =  spiffs_get_cache_page(fs, cache, cp->ix);
    memcpy(dst, &mem[SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr)], len);
  } else {
    if ((op & SPIFFS_OP_TYPE_MASK) == SPIFFS_OP_T_OBJ_LU2) {
      // for second layer lookup functions, we do not cache in order to prevent shredding
      return SPIFFS_HAL_READ(fs, addr, len, dst);
    }
#if SPIFFS_CACHE_STATS
    fs->cache_misses++;
#endif
    // this operation will always free one cache page (unless all already free),
    // the result code stems from the write operation of the possibly freed cache page
    res = spiffs_cache_page_remove_oldest(fs, SPIFFS_CACHE_FLAG_TYPE_WR, 0);

    cp = spiffs_cache_page_allocate(fs);
    if (cp) {
      cp->flags = SPIFFS_CACHE_FLAG_WRTHRU;
      cp->pix = SPIFFS_PADDR_TO_PAGE(fs, addr);

      s32_t res2 = SPIFFS_HAL_READ(fs,
          addr - SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr),
          SPIFFS_CFG_LOG_PAGE_SZ(fs),
          spiffs_get_cache_page(fs, cache, cp->ix));
      if (res2 != SPIFFS_OK) {
        // honor read failure before possible write failure (bad idea?)
        res = res2;
      }
      u8_t *mem =  spiffs_get_cache_page(fs, cache, cp->ix);
      memcpy(dst, &mem[SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr)], len);
    } else {
      // this will never happen, last resort for sake of symmetry
      s32_t res2 = SPIFFS_HAL_READ(fs, addr, len, dst);
      if (res2 != SPIFFS_OK) {
        // honor read failure before possible write failure (bad idea?)
        res = res2;
      }
    }
  }
  return res;
}

Esempio n. 2

File: spiffs_cache.c Progetto: AriZuu/picoos-micro-spiffs

// reads from spi flash or the cache
s32_t spiffs_phys_rd(
    spiffs *fs,
    u8_t op,
    spiffs_file fh,
    u32_t addr,
    u32_t len,
    u8_t *dst) {
  (void)fh;
  s32_t res = SPIFFS_OK;
  spiffs_cache *cache = spiffs_get_cache(fs);
  spiffs_cache_page *cp =  spiffs_cache_page_get(fs, SPIFFS_PADDR_TO_PAGE(fs, addr));
  cache->last_access++;
  if (cp) {
#if SPIFFS_CACHE_STATS
    fs->cache_hits++;
#endif
    cp->last_access = cache->last_access;
  } else {
    if ((op & SPIFFS_OP_TYPE_MASK) == SPIFFS_OP_T_OBJ_LU2) {
      // for second layer lookup functions, we do not cache in order to prevent shredding
      return SPIFFS_HAL_READ(fs, addr, len, dst);
    }
#if SPIFFS_CACHE_STATS
    fs->cache_misses++;
#endif
    res = spiffs_cache_page_remove_oldest(fs, SPIFFS_CACHE_FLAG_TYPE_WR, 0);
    cp = spiffs_cache_page_allocate(fs);
    if (cp) {
      cp->flags = SPIFFS_CACHE_FLAG_WRTHRU;
      cp->pix = SPIFFS_PADDR_TO_PAGE(fs, addr);
    }
    s32_t res2 = SPIFFS_HAL_READ(fs,
        addr - SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr),
        SPIFFS_CFG_LOG_PAGE_SZ(fs),
        spiffs_get_cache_page(fs, cache, cp->ix));
    if (res2 != SPIFFS_OK) {
      res = res2;
    }
  }
  u8_t *mem =  spiffs_get_cache_page(fs, cache, cp->ix);
  memcpy(dst, &mem[SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr)], len);
  return res;
}