int luat_flash_read(char *buff, size_t addr, size_t len)
读�指定区域的Flash数�
int luat_flash_erase(size_t addr, size_t len)
抹除指定区域的flash数�
int luat_flash_write(char *buff, size_t addr, size_t len)
写入指定区域的flash数�
size_t luat_flash_get_fskv_addr(size_t *len)
获�kv起始地�与长度