一、SNTP简介

简单网络时间协议（Simple Network Time Protocol），由 NTP 改编而来，主要用来同步因特网中的计算机时钟

二、SNTP接口

SNTP 接口位于 ESP8266_NONOS_SDK/include/sntp.h。

三、初始化SNTP

设置三个时间服务器域名并初始化。

/**@brief 初始化SNTP服务@param 无@return 无
*/
void ICACHE_FLASH_ATTR
SNTP_Init(void)
{sntp_setservername(0,"0.cn.pool.ntp.org");sntp_setservername(1,"1.cn.pool.ntp.org");sntp_setservername(2,"2.cn.pool.ntp.org");sntp_init();
}

四、获取SNTP时间

4.1 获取时间字符串

/**@brief 获取SNTP时间@param pRealTime -[in&out] 实时时间@return 无
*/
void ICACHE_FLASH_ATTR
GetSntpTime(char *pRealTime)
{uint32_t time = sntp_get_current_timestamp();os_sprintf(pRealTime, "%s", sntp_get_real_time(time));os_sprintf(pRealTime, "%s", sntpTimeChangeToSimpleDateFormat(pRealTime));
}

由于通过 sntp_get_real_time()函数 获取出来的时间字符串格式为Thu Dec 27 22:40:21 2018，不是我想要的格式，所以需要重新转换格式。

4.2 SNTP时间转化为简单日期格式

typedef struct sntpData_t
{uint8 week;uint8 month;uint8 day;uint8 hour;uint8 minute;uint8 second;uint8 year;
} SntpData_t;/**@brief SNTP时间转化为简单日期格式@param pSntpRealTime -[in] 实时时间@return 简单日期格式时间字符串
*/
static char *ICACHE_FLASH_ATTR
sntpTimeChangeToSimpleDateFormat(char *pSntpRealTime)
{if(!pSntpRealTime){return "";}pSntpRealTime[24] = '\0';						// 不要年份后面的数据SntpData_t sntpData;uint8 dateType[7] = {3, 3, 2, 2, 2, 2, 4};		// 3-Fri 3-May 2-31 2-11: 2-21: 2-42 4-2019uint8 temp[5];uint8 i = 0, j = 0;while(*pSntpRealTime != '\0'){if(*pSntpRealTime == ' ' || *pSntpRealTime == ':'){pSntpRealTime++;i++;}else{os_memset(temp, '\0', 5);for(j = 0; j < dateType[i]; j++){temp[j] = *pSntpRealTime;pSntpRealTime++;}switch(i){case 0: // 周sntpData.week = checkWahtWeek(temp);break;case 1: // 月sntpData.month = checkWahtMonth(temp);break;case 2: // 日sntpData.day = checkWahtDay(temp);break;case 3: // 时sntpData.hour = checkWahtHour(temp);break;case 4: // 分sntpData.minute = checkWahtMinute(temp);break;case 5: // 秒sntpData.second = checkWahtSecond(temp);break;case 6: // 年sntpData.year = checkWahtYear(temp);break;default:break;}}}os_memset(pSntpRealTime, 0, 24);os_sprintf(pSntpRealTime, "20%x-%02x-%02x %02x:%02x:%02x",sntpData.year, sntpData.month,sntpData.day, sntpData.hour,sntpData.minute, sntpData.second);return pSntpRealTime;
}

4.3 解析年月日时分秒

/**@brief 检查星期几@param pWeek -[in] 待检测字符串@return 星期几
*/
static uint8 ICACHE_FLASH_ATTR
checkWahtWeek(char *pWeek)
{if(!pWeek){return 0;}uint8 week;if(strcmp(pWeek, "Mon") == 0){week = 1;									// 星期一}else if(strcmp(pWeek, "Tue") == 0){week = 2;									// 星期二}else if(strcmp(pWeek, "Wed") == 0){week = 3;									// 星期三}else if(strcmp(pWeek, "Thu") == 0){week = 4;									// 星期四}else if(strcmp(pWeek, "Fri") == 0){week = 5;									// 星期五}else if(strcmp(pWeek, "Sat") == 0){week = 6;									// 星期六}else if(strcmp(pWeek, "Sun") == 0){week = 7;									// 星期天}return week;
}/**@brief 检查几月份@param pMonth -[in] 待检测字符串@return 几月份
*/
static uint8 ICACHE_FLASH_ATTR
checkWahtMonth(char *pMonth)
{if(!pMonth){return 0;}uint8 month;if(strcmp(pMonth, "Jan") == 0){month = 1;									// 一月}else if(strcmp(pMonth, "Feb") == 0){month = 2;									// 二月}else if(strcmp(pMonth, "Mar") == 0){month = 3;									// 三月}else if(strcmp(pMonth, "Apr") == 0){month = 4;									// 四月}else if(strcmp(pMonth, "May") == 0){month = 5;									// 五月}else if(strcmp(pMonth, "Jun") == 0){month = 6;									// 六月}else if(strcmp(pMonth, "Jul") == 0){month = 7;									// 七月}else if(strcmp(pMonth, "Aug") == 0){month = 8;									// 八月}else if(strcmp(pMonth, "Sep") == 0){month = 9;									// 九月}else if(strcmp(pMonth, "Oct") == 0){month = 10;									// 十月}else if(strcmp(pMonth, "Nov") == 0){month = 11;									// 十一月}else if(strcmp(pMonth, "Dec") == 0){month = 12;									// 十二月}return month;
}/**@brief 检查几日@param pDay -[in] 待检测字符串@return 几日
*/
static uint8 ICACHE_FLASH_ATTR
checkWahtDay(char *pDay)
{if(!pDay){return 0;}uint8 day = (*pDay & 0x0f) << 4;day = day | (*(pDay+1) & 0x0f);return day;
}/**@brief 检查几时@param pHour -[in] 待检测字符串@return 几时
*/
static uint8 ICACHE_FLASH_ATTR
checkWahtHour(char *pHour)
{if(!pHour){return 0;}uint8 hour = (*pHour & 0x0f) << 4;hour = hour | (*(pHour+1) & 0x0f);return hour;
}/**@brief 检查几分@param pMinute -[in] 待检测字符串@return 几分
*/
static uint8 ICACHE_FLASH_ATTR
checkWahtMinute(char *pMinute)
{if(!pMinute){return 0;}uint8 minute = (*pMinute & 0x0f) << 4;minute = minute | (*(pMinute+1) & 0x0f);return minute;
}/**@brief 检查几秒@param pSecond -[in] 待检测字符串@return 几秒
*/
static uint8 ICACHE_FLASH_ATTR
checkWahtSecond(char *pSecond)
{if(!pSecond){return 0;}uint8 second = (*pSecond & 0x0f) << 4;second = second | (*(pSecond+1) & 0x0f);return second;
}/**@brief 检查几年@param pYear -[in] 待检测字符串@return 几年
*/
static uint8 ICACHE_FLASH_ATTR
checkWahtYear(char *pYear)
{if(!pYear){return 0;}uint8 year = (*(pYear+2) & 0x0f) << 4;year = year | (*(pYear+3) & 0x0f);return year;
}

五、使用方法

首先，在 user_main.c 的 user_init() 中调用 SNTP_Init() 初始化。

void ICACHE_FLASH_ATTR
user_init(void)
{···SNTP_Init();														// SNTP服务初始化···
}

在其他地方调用 GetSntpTime() 获取时间

uint8 time[25];
GetSntpTime(time);
os_printf("%s\n", time);

获取到时间格式为：
2019-07-31 17:01:01

---

• 由 Leung 写于 2019 年 7 月 31日

• 参考：esp8266_SNTP时间获取处理成BCD码
　　　　ESP8266 Non-OS SDK API参考[7qq6]