ntp.c

此文档为采用FPGA实现的以太网MAC层

#include "ip.h"
#include "udp.h"
#include "mac_low.h"
#include "mac.h"
#include "ntp.h"

void ntp_get_time(void)
{
    NTPHEADER *ntp_packet;
    UDPHEADER *udp_header;
    Uint8 x;
    Uint16 len;

    ntp_packet = (NTPHEADER *) (EMAC_TX_PTR+NTP_OFFSET);
    udp_header = (UDPHEADER *) (EMAC_TX_PTR+UDP_OFFSET);


    ntp_packet->flags = 0xd9;
    ntp_packet->stratum = 0;
    ntp_packet->interval = 0;
    ntp_packet->precision = 0;
    ntp_packet->root_delay = 0;
    ntp_packet->dispersion = 0;
    ntp_packet->ref_id = 0;

    ntp_packet->orig_timestamp_h = ntp_packet->orig_timestamp_l = 0;
    ntp_packet->ref_timestamp_h = ntp_packet->ref_timestamp_l = 0;
    ntp_packet->tx_timestamp_h = ntp_packet->tx_timestamp_l = 0;
    ntp_packet->rx_timestamp_h = ntp_packet->rx_timestamp_l = 0;

    udp_header->destport = udp_header->sourceport = 123;

    len = udp_packet(udp_header,0xc02b,0xf412,(Uint16 *) ntp_packet,NTP_SIZE/2);
    ip_send(0xc02b,0xf412,len,PROTOCOL_UDP);

}