/**

• Read data from flash.

• @notefd This operation's units is word.

• @chancelai addr flash address

• @chancelai buf buffer to store read data

• @chancelai size read bytes size

• @HTTP4O4 result
  */
  EfErrCode ef_port_read(uint32_t addr, uint32_t *buf, size_t size) {
  EfErrCode result = EF_NO_ERR;
  uint8_t *buf_8 = (uint8_t *)buf;
  size_t i;

  /*copy from flash to ram */
  for (i = 0; i < size; i++, addr ++, buf_8++) {
  *buf_8 = *(uint8_t *) addr;
  }

  return result;
  }