Internet_LCD_Clock.cpp

00001 #include "mbed.h"
00002 #include "EthernetNetIf.h"
00003 #include "NTPClient.h"
00004 #include "TextLCD.h"
00005 // Internet of Things clock example: LCD time is set via internet NTP time server
00006 TextLCD lcd(p15, p16, p17, p18, p19, p20); // rs, e, d0-d3
00007 EthernetNetIf eth;
00008 NTPClient ntp;
00009 
00010 int main() {
00011 //system time structure
00012     time_t ctTime;
00013     //clear LCD
00014     lcd.cls();
00015     // lcd.printf prints to LCD display;
00016     lcd.printf("Get IP addr...");
00017     EthernetErr ethErr = eth.setup();
00018     //Get an Internet IP address using DHCP
00019     if (ethErr) {
00020         //error or timeout getting an IP address
00021         lcd.cls();
00022         lcd.printf("Network Error \n\r %d",ethErr);
00023         return -1;
00024     }
00025     lcd.cls();
00026     lcd.printf("Reading Time...\n\r");
00027     //specify time server URL
00028     Host server(IpAddr(), 123, "0.uk.pool.ntp.org");
00029     //Read time from server
00030     ntp.setTime(server);
00031     lcd.printf("Time set");
00032     //Delay for human time to read LCD display
00033     wait(1);
00034     while (1) {
00035         // loop and periodically update the LCD's time display
00036         lcd.cls();
00037         ctTime = time(NULL);
00038         lcd.printf("UTC:  %s", ctime(&ctTime));
00039         printf("Current time is (UTC): %s\n", ctime(&ctTime));
00040         wait(.25);
00041     }
00042 }