Diff: ntpclient.cpp

Revision:

32:00114e36de90

Child:

33:39d9cdf99de8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ntpclient.cpp	Wed Oct 26 12:47:31 2011 +0000
@@ -0,0 +1,31 @@
+#include "EthernetNetIf.h"
+#include "SimpleSocket.h"
+
+void ntpclient() {
+    char *NTP_SERVER = "pool.ntp.org";
+    
+    printf("ntp client - %s\n", NTP_SERVER);
+
+    while (true) {
+        DatagramSocket datagram;
+        char buf[48] = {0x23};// 00100011 LI(0), Version(4), Mode(3: Client)
+        datagram.write(buf, sizeof(buf));
+        datagram.send(NTP_SERVER, 123);
+        
+        if (datagram.receive() > 0) {
+            if (datagram.read(buf, sizeof(buf))) {
+                unsigned long seconds = 0;
+                for (int i = 40; i <= 43; i++)
+                    seconds = (seconds << 8) | buf[i];
+                seconds -= 2208988800ULL;               
+                set_time((time_t) seconds);
+                
+                char buf[16];
+                time_t jstime = time(NULL) + 9 * 3600;
+                strftime(buf, sizeof(buf), "%m/%d %X", localtime(&jstime));
+                printf("Time: %s\n", buf);
+                break;
+            }
+        }
+    }
+}
\ No newline at end of file