EK-TM4C1294XL: need example code

Please download the SW-SECURE-IOT-DEMO software package from www.ti.com/.../SW-EK-TM4C129EXL.

Please also read this post. e2e.ti.com/.../2017227

i couldn't get SW-SECURE-IOT-DEMO example in it.. even i download that also. please provide me the example code for that 

thank you

What you download is an installer. You will need to run the installer. Here is the installer.

spmc022.zip

ya i installed same thing but in that not there keil version of code. just there only text files so.

thank you

i found that code for keil but i could not get call back from UDP. please try solve it
THANK YOU

/**
* @file
* SNTP client module
*
*/


#include "lwip/opt.h"

#include "sntp.h"

#include "lwip/timers.h"
#include "lwip/udp.h"
#include "lwip/dns.h"
#include "lwip/ip_addr.h"
#include "lwip/pbuf.h"

#include <string.h>
#include <time.h>

extern struct tm RTC;

uint8_t ntp_send_cmnd_set;

extern tConfigParameters g_sParameters;

#if LWIP_UDP

/** This is simple "SNTP" client for socket or raw API.
* It is a minimal implementation of SNTPv4 as specified in RFC 4330.
*
* For a list of some public NTP servers, see this link :
* support.ntp.org/.../NTPPoolServers
*
* @todo:
* - set/change servers at runtime
* - complete SNTP_CHECK_RESPONSE checks 3 and 4
* - support broadcast/multicast mode?
*/


#define SNTP_SERVER_DNS 0

/** Decide whether to build SNTP for socket or raw API
* The socket API SNTP client is a very minimal implementation that does not
* fully confor to the SNTPv4 RFC, especially regarding server load and error
* procesing. */
#ifndef SNTP_SOCKET
#define SNTP_SOCKET 0
#endif

#if SNTP_SOCKET
#include "lwip/sockets.h"
#endif

/**
* SNTP_DEBUG: Enable debugging for SNTP.
*/
#ifndef SNTP_DEBUG
#define SNTP_DEBUG LWIP_DBG_OFF
#endif

/** SNTP server port */
#ifndef SNTP_PORT
#define SNTP_PORT 123
#endif

/** Set this to 1 to allow SNTP_SERVER_ADDRESS to be a DNS name */
#ifndef SNTP_SERVER_DNS
#define SNTP_SERVER_DNS 0
#endif

/** Set this to 1 to support more than one server */
#ifndef SNTP_SUPPORT_MULTIPLE_SERVERS
#define SNTP_SUPPORT_MULTIPLE_SERVERS 0
#endif

/** SNTP server address:
* - as IPv4 address in "u32_t" format
* - as a DNS name if SNTP_SERVER_DNS is set to 1
* May contain multiple server names (e.g. "pool.ntp.org","second.time.server")
*/
#ifndef SNTP_SERVER_ADDRESS
#if SNTP_SERVER_DNS
#define SNTP_SERVER_ADDRESS "pool.ntp.org"
#else
#define SNTP_SERVER_ADDRESS "128.138.140.44"
#endif
#endif

/** Sanity check:
* Define this to
* - 0 to turn off sanity checks (default; smaller code)
* - >= 1 to check address and port of the response packet to ensure the
* response comes from the server we sent the request to.
* - >= 2 to check returned Originate Timestamp against Transmit Timestamp
* sent to the server (to ensure response to older request).
* - >= 3 @todo: discard reply if any of the LI, Stratum, or Transmit Timestamp
* fields is 0 or the Mode field is not 4 (unicast) or 5 (broadcast).
* - >= 4 @todo: to check that the Root Delay and Root Dispersion fields are each
* greater than or equal to 0 and less than infinity, where infinity is
* currently a cozy number like one second. This check avoids using a
* server whose synchronization source has expired for a very long time.
*/
#ifndef SNTP_CHECK_RESPONSE
#define SNTP_CHECK_RESPONSE 2
#endif

/** According to the RFC, this shall be a random delay
* between 1 and 5 minutes (in milliseconds) to prevent load peaks.
* This can be defined to a random generation function,
* which must return the delay in milliseconds as u32_t.
* Turned off by default.
*/
#ifndef SNTP_STARTUP_DELAY
#define SNTP_STARTUP_DELAY 1
#endif

/** SNTP receive timeout - in milliseconds
* Also used as retry timeout - this shouldn't be too low.
* Default is 3 seconds.
*/
#ifndef SNTP_RECV_TIMEOUT
#define SNTP_RECV_TIMEOUT 5000
#endif

/** SNTP update delay - in milliseconds
* Default is 1 hour.
*/
#ifndef SNTP_UPDATE_DELAY
#define SNTP_UPDATE_DELAY 900000 //3600000
#endif
#if (SNTP_UPDATE_DELAY < 15000) && !SNTP_SUPPRESS_DELAY_CHECK
#error "SNTPv4 RFC 4330 enforces a minimum update time of 15 seconds!"
#endif

/** SNTP macro to change system time and/or the update the RTC clock */
#ifndef SNTP_SET_SYSTEM_TIME
#define SNTP_SET_SYSTEM_TIME(sec) ((void)sec)
#endif

/** SNTP macro to change system time including microseconds */
#ifdef SNTP_SET_SYSTEM_TIME_US
#define SNTP_CALC_TIME_US 1
#define SNTP_RECEIVE_TIME_SIZE 2
#else
#define SNTP_SET_SYSTEM_TIME_US(sec, us)
#define SNTP_CALC_TIME_US 0
#define SNTP_RECEIVE_TIME_SIZE 1
#endif

/** SNTP macro to get system time, used with SNTP_CHECK_RESPONSE >= 2
* to send in request and compare in response.
*/
#ifndef SNTP_GET_SYSTEM_TIME
#define SNTP_GET_SYSTEM_TIME(sec, us) do { (sec) = 0; (us) = 0; } while(0)
#endif

/** Default retry timeout (in milliseconds) if the response
* received is invalid.
* This is doubled with each retry until SNTP_RETRY_TIMEOUT_MAX is reached.
*/
#ifndef SNTP_RETRY_TIMEOUT
#define SNTP_RETRY_TIMEOUT SNTP_RECV_TIMEOUT
#endif

/** Maximum retry timeout (in milliseconds). */
#ifndef SNTP_RETRY_TIMEOUT_MAX
#define SNTP_RETRY_TIMEOUT_MAX (SNTP_RETRY_TIMEOUT * 10)
#endif

/** Increase retry timeout with every retry sent
* Default is on to conform to RFC.
*/
#ifndef SNTP_RETRY_TIMEOUT_EXP
#define SNTP_RETRY_TIMEOUT_EXP 1
#endif

/* the various debug levels for this file */
#define SNTP_DEBUG_TRACE (SNTP_DEBUG | LWIP_DBG_TRACE)
#define SNTP_DEBUG_STATE (SNTP_DEBUG | LWIP_DBG_STATE)
#define SNTP_DEBUG_WARN (SNTP_DEBUG | LWIP_DBG_LEVEL_WARNING)
#define SNTP_DEBUG_WARN_STATE (SNTP_DEBUG | LWIP_DBG_LEVEL_WARNING | LWIP_DBG_STATE)
#define SNTP_DEBUG_SERIOUS (SNTP_DEBUG | LWIP_DBG_LEVEL_SERIOUS)

#define SNTP_ERR_KOD 1

/* SNTP protocol defines */
#define SNTP_MSG_LEN 48

#define SNTP_OFFSET_LI_VN_MODE 0
#define SNTP_LI_MASK 0xC0
#define SNTP_LI_NO_WARNING 0x00
#define SNTP_LI_LAST_MINUTE_61_SEC 0x01
#define SNTP_LI_LAST_MINUTE_59_SEC 0x02
#define SNTP_LI_ALARM_CONDITION 0x03 /* (clock not synchronized) */

#define SNTP_VERSION_MASK 0x38
#define SNTP_VERSION (4/* NTP Version 4*/<<3)

#define SNTP_MODE_MASK 0x07
#define SNTP_MODE_CLIENT 0x03
#define SNTP_MODE_SERVER 0x04
#define SNTP_MODE_BROADCAST 0x05

#define SNTP_OFFSET_STRATUM 1
#define SNTP_STRATUM_KOD 0x00

#define SNTP_OFFSET_ORIGINATE_TIME 24
#define SNTP_OFFSET_RECEIVE_TIME 32
#define SNTP_OFFSET_TRANSMIT_TIME 40

/* number of seconds between 1900 and 1970 */
#define DIFF_SEC_1900_1970 (2208988800UL)

/**
* SNTP packet format (without optional fields)
* Timestamps are coded as 64 bits:
* - 32 bits seconds since Jan 01, 1970, 00:00
* - 32 bits seconds fraction (0-padded)
* For future use, if the MSB in the seconds part is set, seconds are based
* on Feb 07, 2036, 06:28:16.
*/
#ifdef PACK_STRUCT_USE_INCLUDES
# include "arch/bpstruct.h"
#endif
PACK_STRUCT_BEGIN
struct sntp_msg {
PACK_STRUCT_FIELD(u8_t li_vn_mode);
PACK_STRUCT_FIELD(u8_t stratum);
PACK_STRUCT_FIELD(u8_t poll);
PACK_STRUCT_FIELD(u8_t precision);
PACK_STRUCT_FIELD(u32_t root_delay);
PACK_STRUCT_FIELD(u32_t root_dispersion);
PACK_STRUCT_FIELD(u32_t reference_identifier);
PACK_STRUCT_FIELD(u32_t reference_timestamp[2]);
PACK_STRUCT_FIELD(u32_t originate_timestamp[2]);
PACK_STRUCT_FIELD(u32_t receive_timestamp[2]);
PACK_STRUCT_FIELD(u32_t transmit_timestamp[2]);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
# include "arch/epstruct.h"
#endif




/* function prototypes */
static void sntp_request(void *arg);

/** The UDP pcb used by the SNTP client */
struct udp_pcb* sntp_pcb;
/** Addresses of servers */
static char* sntp_server_addresses[] = {SNTP_SERVER_ADDRESS};
#if SNTP_SUPPORT_MULTIPLE_SERVERS
/** The currently used server (initialized to 0) */
static u8_t sntp_current_server;
static u8_t sntp_num_servers = sizeof(sntp_server_addresses)/sizeof(char*);
#else /* SNTP_SUPPORT_MULTIPLE_SERVERS */
#define sntp_current_server 0
#endif /* SNTP_SUPPORT_MULTIPLE_SERVERS */

#if SNTP_RETRY_TIMEOUT_EXP
#define SNTP_RESET_RETRY_TIMEOUT() sntp_retry_timeout = SNTP_RETRY_TIMEOUT
/** Retry time, initialized with SNTP_RETRY_TIMEOUT and doubled with each retry. */
static u32_t sntp_retry_timeout;
#else /* SNTP_RETRY_TIMEOUT_EXP */
#define SNTP_RESET_RETRY_TIMEOUT()
#define sntp_retry_timeout SNTP_RETRY_TIMEOUT
#endif /* SNTP_RETRY_TIMEOUT_EXP */

#if SNTP_CHECK_RESPONSE >= 1
/** Saves the last server address to compare with response */
static ip_addr_t sntp_last_server_address;
#endif /* SNTP_CHECK_RESPONSE >= 1 */

#if SNTP_CHECK_RESPONSE >= 2
/** Saves the last timestamp sent (which is sent back by the server)
* to compare against in response */
static u32_t sntp_last_timestamp_sent[2];
#endif /* SNTP_CHECK_RESPONSE >= 2 */

/**
* SNTP processing of received timestamp
*/
static void
sntp_process(u32_t *receive_timestamp)
{

/* convert SNTP time (1900-based) to unix GMT time (1970-based)
* @todo: if MSB is 1, SNTP time is 2036-based!
*/
time_t t = (ntohl(receive_timestamp[0]) - DIFF_SEC_1900_1970);

memcpy(&RTC, localtime(&t), sizeof (struct tm));

HibernateCalendarSet(&RTC);


UARTprintf("************time_t : %x********************\r\n",t);

#if SNTP_CALC_TIME_US
u32_t us = ntohl(receive_timestamp[1]) / 4295;
SNTP_SET_SYSTEM_TIME_US(t, us);
/* display local time from GMT time */
LWIP_DEBUGF(SNTP_DEBUG_TRACE, ("sntp_process: %s, %"U32_F" us", ctime(&t), us));

#else /* SNTP_CALC_TIME_US */

/* change system time and/or the update the RTC clock */
SNTP_SET_SYSTEM_TIME(t);
/* display local time from GMT time */
LWIP_DEBUGF(SNTP_DEBUG_TRACE, ("sntp_process: %s", ctime(&t)));
#endif /* SNTP_CALC_TIME_US */
}

/**
* Initialize request struct to be sent to server.
*/
void
sntp_initialize_request(struct sntp_msg *req)
{
memset(req, 0, SNTP_MSG_LEN);
req->li_vn_mode = SNTP_LI_NO_WARNING | SNTP_VERSION | SNTP_MODE_CLIENT;

#if SNTP_CHECK_RESPONSE >= 2
{
u32_t sntp_time_sec, sntp_time_us;
/* fill in transmit timestamp and save it in 'sntp_last_timestamp_sent' */
SNTP_GET_SYSTEM_TIME(sntp_time_sec, sntp_time_us);
sntp_last_timestamp_sent[0] = htonl(sntp_time_sec + DIFF_SEC_1900_1970);
req->transmit_timestamp[0] = sntp_last_timestamp_sent[0];
/* we send/save us instead of fraction to be faster... */
sntp_last_timestamp_sent[1] = htonl(sntp_time_us);
req->transmit_timestamp[1] = sntp_last_timestamp_sent[1];
}
#endif /* SNTP_CHECK_RESPONSE >= 2 */
}

#if SNTP_SOCKET

/**
* Send an SNTP request via sockets.
* This is a very minimal implementation that does not fully conform
* to the SNTPv4 RFC, especially regarding server load and error procesing.
*/
static void
sntp_request(void *arg)
{
int sock;
struct sockaddr_in local;
struct sockaddr_in to;
int tolen;
int size;
int timeout;
struct sntp_msg sntpmsg;
ip_addr_t sntp_server_address;

LWIP_UNUSED_ARG(arg);

/* if we got a valid SNTP server address... */
if (ipaddr_aton(SNTP_SERVER_ADDRESS, &sntp_server_address)) {
/* create new socket */
sock = lwip_socket(AF_INET, SOCK_DGRAM, 0);
if (sock >= 0) {
/* prepare local address */
memset(&local, 0, sizeof(local));
local.sin_family = AF_INET;
local.sin_port = PP_HTONS(INADDR_ANY);
local.sin_addr.s_addr = PP_HTONL(INADDR_ANY);

/* bind to local address */
if (lwip_bind(sock, (struct sockaddr *)&local, sizeof(local)) == 0) {
/* set recv timeout */
timeout = SNTP_RECV_TIMEOUT;
lwip_setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout));

/* prepare SNTP request */
sntp_initialize_request(&sntpmsg);

/* prepare SNTP server address */
memset(&to, 0, sizeof(to));
to.sin_family = AF_INET;
to.sin_port = PP_HTONS(SNTP_PORT);
inet_addr_from_ipaddr(&to.sin_addr, &sntp_server_address);

uint32_t ind = 0;

for(ind = 0;ind < 48 ;ind++)
UARTprintf("%x ",sntpmsg[ind]);

/* send SNTP request to server */
if (lwip_sendto(sock, &sntpmsg, SNTP_MSG_LEN, 0, (struct sockaddr *)&to, sizeof(to)) >= 0) {
/* receive SNTP server response */
tolen = sizeof(to);
size = lwip_recvfrom(sock, &sntpmsg, SNTP_MSG_LEN, 0, (struct sockaddr *)&to, (socklen_t *)&tolen);
/* if the response size is good */
if (size == SNTP_MSG_LEN) {
/* if this is a SNTP response... */
if (((sntpmsg.li_vn_mode & SNTP_MODE_MASK) == SNTP_MODE_SERVER) ||
((sntpmsg.li_vn_mode & SNTP_MODE_MASK) == SNTP_MODE_BROADCAST)) {
/* do time processing */
sntp_process(sntpmsg.receive_timestamp);
} else {
LWIP_DEBUGF( SNTP_DEBUG_WARN, ("sntp_request: not response frame code\n"));
}
}
} else {
LWIP_DEBUGF( SNTP_DEBUG_WARN, ("sntp_request: not sendto==%i\n", errno));
}
}
/* close the socket */
closesocket(sock);
}
}
}



/**
* SNTP thread
*/
static void
sntp_thread(void *arg)
{
LWIP_UNUSED_ARG(arg);
while(1) {
sntp_request(NULL);
sys_msleep(SNTP_UPDATE_DELAY);
}
}

/**
* Initialize this module when using sockets
*/
void
sntp_init(void)
{
sys_thread_new("sntp_thread", sntp_thread, NULL, DEFAULT_THREAD_STACKSIZE, DEFAULT_THREAD_PRIO);
}

#else /* SNTP_SOCKET */

/**
* Retry: send a new request (and increase retry timeout).
*
* @param arg is unused (only necessary to conform to sys_timeout)
*/
static void
sntp_retry(void* arg)
{
LWIP_UNUSED_ARG(arg);

LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_retry: Next request will be sent in %"U32_F" ms\n",
sntp_retry_timeout));

/* set up a timer to send a retry and increase the retry delay */
sys_timeout(sntp_retry_timeout, sntp_request, NULL);

#if SNTP_RETRY_TIMEOUT_EXP
{
u32_t new_retry_timeout;
/* increase the timeout for next retry */
new_retry_timeout = sntp_retry_timeout << 1;
/* limit to maximum timeout and prevent overflow */
if ((new_retry_timeout <= SNTP_RETRY_TIMEOUT_MAX) &&
(new_retry_timeout > sntp_retry_timeout)) {
sntp_retry_timeout = new_retry_timeout;
}
}
#endif /* SNTP_RETRY_TIMEOUT_EXP */
}

#if SNTP_SUPPORT_MULTIPLE_SERVERS
/**
* If Kiss-of-Death is received (or another packet parsing error),
* try the next server or retry the current server and increase the retry
* timeout if only one server is available.
*
* @param arg is unused (only necessary to conform to sys_timeout)
*/
static void
sntp_try_next_server(void* arg)
{
LWIP_UNUSED_ARG(arg);

if (sntp_num_servers > 1) {
/* new server: reset retry timeout */
SNTP_RESET_RETRY_TIMEOUT();
sntp_current_server++;
if (sntp_current_server >= sntp_num_servers) {
sntp_current_server = 0;
}
LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_try_next_server: Sending request to server %"U16_F"\n",
(u16_t)sntp_current_server));
/* instantly send a request to the next server */
sntp_request(NULL);
} else {
sntp_retry(NULL);
}
}
#else /* SNTP_SUPPORT_MULTIPLE_SERVERS */
/* Always retry on error if only one server is supported */
#define sntp_try_next_server sntp_retry
#endif /* SNTP_SUPPORT_MULTIPLE_SERVERS */

/** UDP recv callback for the sntp pcb */
static void
sntp_recv(void *arg, struct udp_pcb* pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
{
u8_t mode;
u8_t stratum;
u32_t receive_timestamp[SNTP_RECEIVE_TIME_SIZE];
err_t err;

LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(pcb);

/* packet received: stop retry timeout */
sys_untimeout(sntp_try_next_server, NULL);
sys_untimeout(sntp_request, NULL);

err = ERR_ARG;
#if SNTP_CHECK_RESPONSE >= 1
/* check server address and port */
if (ip_addr_cmp(addr, &sntp_last_server_address) &&
(port == SNTP_PORT))
#else /* SNTP_CHECK_RESPONSE >= 1 */
LWIP_UNUSED_ARG(addr);
LWIP_UNUSED_ARG(port);
#endif /* SNTP_CHECK_RESPONSE >= 1 */
{
/* process the response */
if (p->tot_len == SNTP_MSG_LEN) {
pbuf_copy_partial(p, &mode, 1, SNTP_OFFSET_LI_VN_MODE);
mode &= SNTP_MODE_MASK;
/* if this is a SNTP response... */
if ((mode == SNTP_MODE_SERVER) ||
(mode == SNTP_MODE_BROADCAST)) {
pbuf_copy_partial(p, &stratum, 1, SNTP_OFFSET_STRATUM);
if (stratum == SNTP_STRATUM_KOD) {
/* Kiss-of-death packet. Use another server or increase UPDATE_DELAY. */
err = SNTP_ERR_KOD;
LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_recv: Received Kiss-of-Death\n"));
} else {
#if SNTP_CHECK_RESPONSE >= 2
/* check originate_timetamp against sntp_last_timestamp_sent */
u32_t originate_timestamp[2];
pbuf_copy_partial(p, &originate_timestamp, 8, SNTP_OFFSET_ORIGINATE_TIME);
if ((originate_timestamp[0] != sntp_last_timestamp_sent[0]) ||
(originate_timestamp[1] != sntp_last_timestamp_sent[1]))
{
LWIP_DEBUGF(SNTP_DEBUG_WARN, ("sntp_recv: Invalid originate timestamp in response\n"));
} else
#endif /* SNTP_CHECK_RESPONSE >= 2 */
/* @todo: add code for SNTP_CHECK_RESPONSE >= 3 and >= 4 here */
{
/* correct answer */
err = ERR_OK;
pbuf_copy_partial(p, &receive_timestamp, SNTP_RECEIVE_TIME_SIZE * 4, SNTP_OFFSET_RECEIVE_TIME);
}
}
} else {
LWIP_DEBUGF(SNTP_DEBUG_WARN, ("sntp_recv: Invalid mode in response: %"U16_F"\n", (u16_t)mode));
}
} else {
LWIP_DEBUGF(SNTP_DEBUG_WARN, ("sntp_recv: Invalid packet length: %"U16_F"\n", p->tot_len));
}
}
pbuf_free(p);
if (err == ERR_OK) {
/* Correct response, reset retry timeout */
SNTP_RESET_RETRY_TIMEOUT();

sntp_process(receive_timestamp);

/* Set up timeout for next request */
sys_timeout((u32_t)SNTP_UPDATE_DELAY, sntp_request, NULL);
LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_recv: Scheduled next time request: %"U32_F" ms\n",
(u32_t)SNTP_UPDATE_DELAY));
} else if (err == SNTP_ERR_KOD) {
/* Kiss-of-death packet. Use another server or increase UPDATE_DELAY. */
sntp_try_next_server(NULL);
} else {
/* another error, try the same server again */
sntp_retry(NULL);
}
}

/** Actually send an sntp request to a server.
*
* @param server_addr resolved IP address of the SNTP server
*/
static void
sntp_send_request(ip_addr_t *server_addr)
{
struct pbuf* p;
p = pbuf_alloc(PBUF_TRANSPORT, SNTP_MSG_LEN, PBUF_RAM);
if (p != NULL) {

struct sntp_msg *sntpmsg = (struct sntp_msg *)p->payload;

uint8_t sntp_packet[] = {0x1B,0x00,0x06,0xEC,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x49,0x4E,0x49,0x52,0x00,0x00,0x00,0x00,0x00,0x00,0x00,00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};

//uint8_t*My_packet = (uint8_t*)p->payload;

memcpy(p->payload,sntp_packet,48);

LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_send_request: Sending request to server\n"));
/* initialize request message */
//sntp_initialize_request(sntpmsg);



uint32_t len = 0;
UARTprintf("PayLoad \r\n");
// for(len = 0;len < p->len;len++)
//UARTprintf("%s ",p->payload);
/* send request */
UARTprintf("Server Address : %X\r\n",server_addr);
udp_sendto(sntp_pcb, p, server_addr, SNTP_PORT);
/* set up receive timeout: try next server or retry on timeout */
sys_timeout((u32_t)SNTP_RECV_TIMEOUT, sntp_try_next_server, NULL);

#if SNTP_CHECK_RESPONSE >= 1
/* save server address to verify it in sntp_recv */
ip_addr_set(&sntp_last_server_address, server_addr);
#endif /* SNTP_CHECK_RESPONSE >= 1 */
} else {
LWIP_DEBUGF(SNTP_DEBUG_SERIOUS, ("sntp_send_request: Out of memory, trying again in %"U32_F" ms\n",
(u32_t)SNTP_RETRY_TIMEOUT));
/* out of memory: set up a timer to send a retry */
sys_timeout((u32_t)SNTP_RETRY_TIMEOUT, sntp_request, NULL);
}
}

#if SNTP_SERVER_DNS
/**
* DNS found callback when using DNS names as server address.
*/
static void
sntp_dns_found(const char* hostname, ip_addr_t *ipaddr, void *arg)
{
LWIP_UNUSED_ARG(hostname);
LWIP_UNUSED_ARG(arg);

if (ipaddr != NULL) {
/* Address resolved, send request */
LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_dns_found: Server address resolved, sending request\n"));
sntp_send_request(ipaddr);
} else {
/* DNS resolving failed -> try another server */
LWIP_DEBUGF(SNTP_DEBUG_WARN_STATE, ("sntp_dns_found: Failed to resolve server address resolved, trying next server\n"));
sntp_try_next_server(NULL);
}
}
#endif /* SNTP_SERVER_DNS */

/**
* Send out an sntp request via raw API.
*
* @param arg is unused (only necessary to conform to sys_timeout)
*/
static void
sntp_request(void *arg)
{
ip_addr_t sntp_server_address;
err_t err;

UARTprintf("************Sends Reqst**********\r\n");
LWIP_UNUSED_ARG(arg);

/* initialize SNTP server address */
#if SNTP_SERVER_DNS
err = dns_gethostbyname((static char*)g_s, &sntp_server_address,
sntp_dns_found, NULL);


if (err == ERR_INPROGRESS) {
/* DNS request sent, wait for sntp_dns_found being called */
UARTprintf("Dns not resolved\r\n");
LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_request: Waiting for server address to be resolved.\n"));
return;
}
#else /* SNTP_SERVER_DNS */
err = ipaddr_aton(g_sParameters.Ntp_Server_IP, &sntp_server_address)
? ERR_OK : ERR_ARG;

#endif /* SNTP_SERVER_DNS */

if (err == ERR_OK) {

UARTprintf("*** Send Ntp Reqst ***\r\n");

sntp_send_request(&sntp_server_address);
} else {
/* address conversion failed, try another server */
LWIP_DEBUGF(SNTP_DEBUG_WARN_STATE, ("sntp_request: Invalid server address, trying next server.\n"));
sys_timeout((u32_t)SNTP_RETRY_TIMEOUT, sntp_try_next_server, NULL);
}
}

/**
* Initialize this module when using raw API.
* Send out request instantly or after SNTP_STARTUP_DELAY.
*/
void
sntp_init(void)
{
sys_untimeout(sntp_request, NULL);

SNTP_RESET_RETRY_TIMEOUT();

sntp_pcb = udp_new();

UARTprintf("**** SNTP : %x ******\r\n",sntp_pcb);

if (sntp_pcb != NULL) {
udp_recv(sntp_pcb, sntp_recv, NULL);
#if SNTP_STARTUP_DELAY
sys_timeout(1, sntp_request, NULL);
#else
sntp_request(NULL);
#endif
}
}

#endif /* SNTP_SOCKET */

#endif /* LWIP_UDP */


THIS IS MY CODE ..