Diff: main.cpp

Revision:

0:7e901efc73e7

Child:

1:7974d199ed39

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Mar 25 16:54:13 2011 +0000
@@ -0,0 +1,99 @@
+#include "mbed.h"
+#include "time.h"
+#include "TextLCD.h"
+#include "EthernetNetIf.h"
+#include "NTPClient.h"
+
+#define TIMEZONE (9 * 60 * 60)
+
+TextLCD lcd(p21, p22, p23, p24, p25, p26);
+
+EthernetNetIf eth;
+NTPClient ntp;
+
+unsigned long convert_gregorian_to_julian(int year, int month, int day)
+{
+	if (month < 3) {
+		month += 9;
+		year--;
+	} else {
+		month -= 3;
+	}
+	year += 4800;
+	int c = year / 100;
+	return c * 146097 / 4 + (year - c * 100) * 1461 / 4 + (153 * month + 2) / 5 + day - 32045;
+}
+
+void convert_julian_to_gregorian(unsigned long j, int *year, int *month, int *day)
+{
+	int y, m, d;
+	y = (j * 4 + 128179) / 146097;
+	d = (j * 4 - y * 146097 + 128179) / 4 * 4 + 3;
+	j = d / 1461;
+	d = (d - j * 1461) / 4 * 5 + 2;
+	m = d / 153;
+	d = (d - m * 153) / 5 + 1;
+	y = (y - 48) * 100 + j;
+	if (m < 10) {
+		m += 3;
+	} else {
+		m -= 9;
+		y++;
+	}
+	*year = y;
+	*month = m;
+	*day = d;
+}
+
+void display(int year, int month, int day, int hour, int minute, int second)
+{
+    lcd.cls();
+    lcd.printf("%04u-%02u-%02u\n", year, month, day);
+    lcd.printf("%02u:%02u:%02u\n", hour, minute, second);
+}
+
+int main()
+{
+    eth.setup();
+
+    Host server(IpAddr(), 123, "ntp.jst.mfeed.ad.jp");
+ 
+    bool adjust = true;
+
+    double last = 0;
+
+    while (1) {
+        if (adjust) {
+            ntp.setTime(server);
+            adjust = false;
+        }
+        
+        time_t t = time(0);
+        double s = t + 2440588.0 * 24 * 60 * 60; // chronological julian second
+
+        if (s > last) {
+            last = s;
+
+            s += TIMEZONE;
+
+            unsigned long cjd = (unsigned long)(s / (24 * 60 * 60)); // chronological julian day
+            int year, month, day, hour, minute, second;
+            convert_julian_to_gregorian(cjd, &year, &month, &day);
+            second = (int)fmod(s, 24 * 60 * 60);
+            hour = second / (60 * 60);
+            minute = second / 60 % 60;
+            second %= 60;
+
+            display(year, month, day, hour, minute, second);
+
+            if (hour == 4 && minute == 0 && second == 0) {
+                adjust = true;
+            }
+        }
+        
+        wait(0.1);
+    }
+
+    return 0;
+}
+