ntp.h File Reference

#include <string.h>
#include <time.h>
#include "pico/stdlib.h"
#include "pico/cyw43_arch.h"
#include "lwip/dns.h"
#include "lwip/pbuf.h"
#include "lwip/udp.h"

Go to the source code of this file.

Data Structures
struct	NTP_T_
	NTP struct. More...

Macros
#define	NTP_SERVER   "pool.ntp.org"
#define	NTP_MSG_LEN   48
#define	NTP_PORT   123
#define	NTP_DELTA   2208988800
#define	NTP_TEST_TIME   (30 * 1000)
#define	NTP_RESEND_TIME   (10 * 1000)

Typedefs
typedef struct NTP_T_	NTP_T
	NTP struct.

Functions
static void	ntp_result (NTP_T *state, int status, time_t *result)
	NTP result.
static int64_t	ntp_failed_handler (alarm_id_t id, void *user_data)
	NTP failed handler.
static void	ntp_request (NTP_T *state)
	NTP request.
static void	ntp_dns_found (const char *hostname, const ip_addr_t *ipaddr, void *arg)
	NTP DNS found.
static void	ntp_recv (void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
	NTP recv.
static NTP_T *	ntp_init (void)
	NTP init.
void	ntp_deinit (void)
	NTP deinit.
void	ntp_update_time (void)
	NTP update time.

Variables
volatile struct tm *	utc
	UTC time struct.
volatile struct tm *	current_utc
	UTC time struct.

Macro Definition Documentation

NTP_DELTA

#define NTP_DELTA   2208988800

Definition at line 17 of file ntp.h.

NTP_MSG_LEN

#define NTP_MSG_LEN   48

Definition at line 15 of file ntp.h.

NTP_PORT

#define NTP_PORT   123

Definition at line 16 of file ntp.h.

NTP_RESEND_TIME

#define NTP_RESEND_TIME   (10 * 1000)

Definition at line 19 of file ntp.h.

NTP_SERVER

#define NTP_SERVER   "pool.ntp.org"

Definition at line 14 of file ntp.h.

NTP_TEST_TIME

#define NTP_TEST_TIME   (30 * 1000)

Definition at line 18 of file ntp.h.

Typedef Documentation

NTP_T

typedef struct NTP_T_ NTP_T

NTP struct.

Struct for the NTP state.

Function Documentation

ntp_deinit()

void ntp_deinit

(

void

)

NTP deinit.

Function de-initializes the NTP.

Definition at line 114 of file ntp.c.

{
    if (utc)
    {
        free((void*)utc);
        utc = NULL;
    }
}

References utc.

Referenced by main().

ntp_dns_found()

static void ntp_dns_found ( const char *  hostname, const ip_addr_t *  ipaddr, void *  arg  )

static

NTP DNS found.

Function handles the NTP DNS found.

Parameters

hostname	hostname
ipaddr	IP address
arg	argument

ntp_failed_handler()

static int64_t ntp_failed_handler ( alarm_id_t  id, void *  user_data  )

static

NTP failed handler.

NTP DNS found.

Function handles the NTP failed handler.

Parameters

id	alarm ID
user_data	user data

Returns

: time

Function handles the NTP DNS found.

Parameters

hostname	hostname
ipaddr	IP address
arg	argument

ntp_init()

static NTP_T * ntp_init ( void  )

static

NTP init.

Function initializes the NTP.

Returns

: NTP state

ntp_recv()

static void ntp_recv ( void *  arg, struct udp_pcb *  pcb, struct pbuf *  p, const ip_addr_t *  addr, u16_t  port  )

static

NTP recv.

Function receives the NTP response.

Parameters

arg	argument
pcb	UDP PCB
p	pbuf
addr	IP address
port	port

ntp_request()

static void ntp_request ( NTP_T *  state )

static

NTP request.

Function sends the NTP request.

Parameters

state

NTP state

ntp_result()

static void ntp_result ( NTP_T *  state, int  status, time_t *  result  )

static

NTP result.

Function handles the NTP result.

Parameters

state	NTP state
status	status
result	result

ntp_update_time()

void ntp_update_time

(

void

)

NTP update time.

Function updates the NTP time.

Definition at line 123 of file ntp.c.

{
    NTP_T *state = ntp_init();
    if (!state)
        return;
    if (absolute_time_diff_us(get_absolute_time(), state->ntp_test_time) < 0 && !state->dns_request_sent)
    {
        state->ntp_resend_alarm = add_alarm_in_ms(NTP_RESEND_TIME, ntp_failed_handler, state, true);
        cyw43_arch_lwip_begin();
        int err = dns_gethostbyname(NTP_SERVER, &state->ntp_server_address, ntp_dns_found, state);
        cyw43_arch_lwip_end();
 
        state->dns_request_sent = true;
        if (err == ERR_OK)
            ntp_request(state);
        else if (err != ERR_INPROGRESS)
        {
            printf("DNS request failed\n");
            ntp_result(state, -1, NULL);
        }
    }
    free(state);
}

References NTP_T_::dns_request_sent, ntp_dns_found(), ntp_failed_handler(), ntp_init(), ntp_request(), NTP_T_::ntp_resend_alarm, NTP_RESEND_TIME, ntp_result(), NTP_SERVER, NTP_T_::ntp_server_address, and NTP_T_::ntp_test_time.

Referenced by init().

Variable Documentation

current_utc

volatile struct tm* current_utc

extern

UTC time struct.

Struct for the last checked UTC time.

Definition at line 14 of file ntp.c.

Referenced by ntp_result().

utc

volatile struct tm* utc

extern

UTC time struct.

Struct for the UTC time of program start.

Definition at line 13 of file ntp.c.

Referenced by ntp_deinit(), ntp_result(), and ssi_handler().