Added a SNTP protocol.

Internet/SNTP/sntp.h

@@ -0,0 +1,68 @@
+/*
+ * sntp.h
+ *
+ *  Created on: 2014. 12. 15.
+ *      Author: Administrator
+ */
+
+#ifndef SNTP_H_
+#define SNTP_H_
+
+#include <stdint.h>
+
+/*
+ * @brief Define it for Debug & Monitor DNS processing.
+ * @note If defined, it dependens on <stdio.h>
+ */
+//#define _SNTP_DEBUG_
+
+#define	MAX_SNTP_BUF_SIZE	sizeof(ntpformat)		///< maximum size of DNS buffer. */
+
+/* for ntpclient */
+typedef signed char s_char;
+typedef unsigned long long tstamp;
+typedef unsigned int tdist;
+
+typedef struct _ntpformat
+{
+
+	uint8_t  dstaddr[4];        /* destination (local) address */
+	char    version;        /* version number */
+	char    leap;           /* leap indicator */
+	char    mode;           /* mode */
+	char    stratum;        /* stratum */
+	char    poll;           /* poll interval */
+	s_char  precision;      /* precision */
+	tdist   rootdelay;      /* root delay */
+	tdist   rootdisp;       /* root dispersion */
+	char    refid;          /* reference ID */
+	tstamp  reftime;        /* reference time */
+	tstamp  org;            /* origin timestamp */
+	tstamp  rec;            /* receive timestamp */
+	tstamp  xmt;            /* transmit timestamp */
+
+
+} ntpformat;
+
+typedef struct _datetime
+{
+	uint16_t yy;
+	uint8_t mo;
+	uint8_t dd;
+	uint8_t hh;
+	uint8_t mm;
+	uint8_t ss;
+} datetime;
+
+#define ntp_port		123                     //ntp server port number
+#define SECS_PERDAY		86400UL             	// seconds in a day = 60*60*24
+#define UTC_ADJ_HRS		9              	        // SEOUL : GMT+9
+#define EPOCH			1900                    // NTP start year
+
+void get_seconds_from_ntp_server(uint8_t *buf, uint16_t idx);
+void SNTP_init(uint8_t s, uint8_t *ntp_server, uint8_t tz, uint8_t *buf);
+int8_t SNTP_run(datetime *time);
+tstamp changedatetime_to_seconds(void);
+void calcdatetime(tstamp seconds);
+
+#endif /* SNTP_H_ */