Simple code for comunication via TCP between the mbed and PC.
Dependencies: EthernetInterface SimpleSocket mbed-rtos mbed
Fork of SimpleSocketExamples by
examples/ntpclient.cpp@0:6dc3cfd058c6, 2013-02-04 (annotated)
- Committer:
- yamaguch
- Date:
- Mon Feb 04 09:29:18 2013 +0000
- Revision:
- 0:6dc3cfd058c6
modified to use SimpleSocket/EthernetInterface
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
yamaguch | 0:6dc3cfd058c6 | 1 | #include "SimpleSocket.h" |
yamaguch | 0:6dc3cfd058c6 | 2 | |
yamaguch | 0:6dc3cfd058c6 | 3 | void ntpclient() { |
yamaguch | 0:6dc3cfd058c6 | 4 | char *NTP_SERVER = "pool.ntp.org"; |
yamaguch | 0:6dc3cfd058c6 | 5 | printf("ntp server = %s\n", NTP_SERVER); |
yamaguch | 0:6dc3cfd058c6 | 6 | |
yamaguch | 0:6dc3cfd058c6 | 7 | while (true) { |
yamaguch | 0:6dc3cfd058c6 | 8 | DatagramSocket datagram; |
yamaguch | 0:6dc3cfd058c6 | 9 | char buf[48] = {0x23}; // 00100011 LI(0), Version(4), Mode(3: Client) |
yamaguch | 0:6dc3cfd058c6 | 10 | datagram.write(buf, sizeof(buf)); |
yamaguch | 0:6dc3cfd058c6 | 11 | datagram.send(NTP_SERVER, 123); |
yamaguch | 0:6dc3cfd058c6 | 12 | |
yamaguch | 0:6dc3cfd058c6 | 13 | //datagram.setTimeout(5.0); |
yamaguch | 0:6dc3cfd058c6 | 14 | if (datagram.receive() > 0) { |
yamaguch | 0:6dc3cfd058c6 | 15 | if (datagram.read(buf, sizeof(buf)) > 0) { |
yamaguch | 0:6dc3cfd058c6 | 16 | unsigned long seconds = 0; |
yamaguch | 0:6dc3cfd058c6 | 17 | for (int i = 40; i <= 43; i++) |
yamaguch | 0:6dc3cfd058c6 | 18 | seconds = (seconds << 8) | buf[i]; |
yamaguch | 0:6dc3cfd058c6 | 19 | set_time(time_t(seconds - 2208988800ULL)); |
yamaguch | 0:6dc3cfd058c6 | 20 | char timestamp[16]; |
yamaguch | 0:6dc3cfd058c6 | 21 | time_t jstime = time(NULL) + 9 * 3600; |
yamaguch | 0:6dc3cfd058c6 | 22 | strftime(timestamp, sizeof(timestamp), "%m/%d %X", localtime(&jstime)); |
yamaguch | 0:6dc3cfd058c6 | 23 | printf("Time: %s\n", timestamp); |
yamaguch | 0:6dc3cfd058c6 | 24 | break; |
yamaguch | 0:6dc3cfd058c6 | 25 | } |
yamaguch | 0:6dc3cfd058c6 | 26 | } else { |
yamaguch | 0:6dc3cfd058c6 | 27 | printf("no answer\n"); |
yamaguch | 0:6dc3cfd058c6 | 28 | wait(1.0); |
yamaguch | 0:6dc3cfd058c6 | 29 | } |
yamaguch | 0:6dc3cfd058c6 | 30 | } |
yamaguch | 0:6dc3cfd058c6 | 31 | } |