/* initialize or add/subtract to second of the system time  */
void enet_ptp_timestamp_update_config(uint32_t sign, uint32_t second, uint32_t subsecond)
/* initialize or add/subtract to second of the system time  */
void enet_ptp_timestamp_update_config(uint32_t sign, uint32_t second, uint32_t subsecond)
{
    ENET_PTP_TSUH = second;
    ENET_PTP_TSUL = sign | PTP_TSUL_TMSUSS(subsecond);
}