Storage interface for onboard FRAM chips.
fram_status(* fram_read_ptr_t)(fram_addr addr, size_t len, uint8_t *data)
fram_status(* fram_write_ptr_t)(fram_addr addr, const uint8_t *data, size_t len)
fram_addr(* fram_size_ptr_t)(void)
fram_write_ptr_t write_ptr