如何使用LWIP的SNTP客户端？

血染风采2017

如何使用LWIP的SNTP客户端？

sntp_setoperatingmode(SNTP_OPMODE_POLL);
sntp_setservername（）；

sntp_init();

已知了这些API，如何获取到SNTP服务器的时间？

如果得到时间之后，就可以绑定RTC了。

eric2013

https://stackoverflow.com/questi ... he-time-it-receives

血染风采2017

eric2013 发表于 2021-3-27 08:18
https://stackoverflow.com/questions/61932743/how-does-the-sntp-app-of-the-lwip-component-set-the-tim ...

感谢硬汉哥，已解决。

1. struct datetime
   
2. {
   
3.     unsigned int  year;
   
4.     unsigned char month;
   
5.     unsigned char day;
   
6.     unsigned char weekday;
   
7.     unsigned char hours;
   
8.     unsigned char minutes;
   
9.     unsigned char seconds;
   
10.     unsigned int mseconds;
    
11. };
    
12. 
    
13. /**
    
14. * @brief Set the RTC to a specified time
    
15. * @param datetime  An application specific date and time structure pointer with
    
16. *                  the current time
    
17. * @return  True on success, False otherwise
    
18. */
    
19. bool set_datetime(datetime_t datetime)
    
20. {
    
21.     RTC_DateTypeDef sdate;
    
22.     RTC_TimeTypeDef stime;
    
23.     bool rc = false;
    
24. 
    
25.     if (datetime != NULL)
    
26.     {
    
27.         sdate.WeekDay = datetime->weekday;
    
28.         sdate.Year = datetime->year - 2000;
    
29.         sdate.Month = datetime->month;
    
30.         sdate.Date = datetime->day;
    
31. 
    
32.         // All internal time is 24 hour GMT/UTC
    
33.         stime.Hours = datetime->hours;
    
34.         stime.Minutes = datetime->minutes;
    
35.         stime.Seconds = datetime->seconds;
    
36.         stime.TimeFormat = RTC_HOURFORMAT_24;
    
37.         stime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
    
38.         stime.StoreOperation = RTC_STOREOPERATION_SET;
    
39. 
    
40.         if ((HAL_RTC_SetDate(&hrtc, &sdate, RTC_FORMAT_BIN) == HAL_OK) &&
    
41.                 (HAL_RTC_SetTime(&hrtc, &stime, RTC_FORMAT_BIN) == HAL_OK))
    
42.         {
    
43.             rc = true;
    
44.         }
    
45.     }
    
46. 
    
47.     return rc;
    
48. }
    
49. 
    
50. /**
    
51. * @brief Get the RTC date and time
    
52. * @param datetime  Pointer to an application date and time structure in which to
    
53. *                  return the current date and time
    
54. * @return   True on success and a filled in date and time structure with the current
    
55. *           date and time, False otherwise
    
56. */
    
57. bool get_datetime(datetime_t datetime)
    
58. {
    
59.     RTC_DateTypeDef date;
    
60.     RTC_TimeTypeDef time;
    
61.     bool rc = false;
    
62. 
    
63.     if (datetime != NULL)
    
64.     {
    
65.         // We *MUST* read the RTC in this order to unlock the shadow registers
    
66.         if ((HAL_RTC_GetTime(&hrtc, &time, RTC_FORMAT_BIN) == HAL_OK) &&
    
67.                 (HAL_RTC_GetDate(&hrtc, &date, RTC_FORMAT_BIN) == HAL_OK))
    
68.         {
    
69.             datetime->year = date.Year + 2000;
    
70.             datetime->month = date.Month;
    
71.             datetime->day = date.Date;
    
72.             datetime->weekday = date.WeekDay;
    
73.             datetime->hours = time.Hours;
    
74.             datetime->minutes = time.Minutes;
    
75.             datetime->seconds = time.Seconds;
    
76.             // SecondFraction is a scaler for SubSeconds increments per second that counts down
    
77.             datetime->mseconds = ((time.SecondFraction - time.SubSeconds) * 1000) / (time.SecondFraction + 1);
    
78. 
    
79.             rc = true;
    
80.         }
    
81.     }
    
82. 
    
83.     return rc;
    
84. }
    
85. 
    

复制代码

1. 
   
2. #define SNTP_SERVER_DNS   1
   
3. 
   
4. #include "bsp_rtc.h"
   
5. #include <time.h>
   
6. 
   
7. #define SNTP_SET_SYSTEM_TIME_NTP(sec, us)  do { \
   
8.     struct datetime now = {0}; struct tm now_time; \
   
9.     time_t ut = (unsigned int)((unsigned int)sec + (unsigned int)2085978496L); \
   
10.     localtime_r(&ut, &now_time); \
    
11.     now.year = now_time.tm_year + 1900; \
    
12.     now.month = now_time.tm_mon + 1; \
    
13.     now.day = now_time.tm_mday; \
    
14.     now.weekday = now_time.tm_wday; \
    
15.     now.hours = now_time.tm_hour + 8; \
    
16.     now.minutes = now_time.tm_min; \
    
17.     now.seconds = now_time.tm_sec; \
    
18.     now.mseconds = (((unsigned int)(((uint64_t)(us) * 1000000UL) >> 32)) / 1000); \
    
19.     set_datetime(&now); \
    
20. } while(0);

复制代码

1. static void set_sntp_server_list(void)
   
2. {
   
3.     uint32_t server_list[SNTP_MAX_SERVERS] =
   
4.     {
   
5.         0x279148D2,
   
6.         0x42041876,
   
7.         0x5F066CCA,
   
8.         0x0B6C1978,
   
9.         0x0B0C5CB6,
   
10.     };
    
11. 
    
12.     ip_addr_t sntp_server;
    
13. 
    
14.     for (int i = 0; i < SNTP_MAX_SERVERS; i++)
    
15.     {
    
16.         sntp_server.addr = server_list[i];
    
17.         sntp_setserver(i, &sntp_server);
    
18.     }
    
19. }
    
20. 
    
21. /**
    
22. * @brief Initialize SNTP, only need to call it once
    
23. */
    
24. void initialize_sntp(void)
    
25. {
    
26.     sntp_setoperatingmode(SNTP_OPMODE_POLL);
    
27.     set_sntp_server_list();
    
28.     sntp_init();
    
29. }

复制代码

在应用层调用一次initialize_sntp()即可