WIZnet / smart_watch

The Smart Watch using SSD1306 and I2C. The Time obtain using SNTP protocol from NTP Server.

Dependencies:   WIZnetInterface SNTPClinet mbed-dev

Prerequisite

This example is to obtain a time from NTP server using SNTP protocol.

To implement this function, you need a Platform board and OLED.

Below are what we used.

  • WIZwiki-W7500 from WIZnet (Platform board)
  • OLED from WIZnet

Hardware Configuration

WIZwiki-W7500 Pin map

pin map

OLED (from WIZnet)

/media/uploads/stkim92/oled.png

Wiring Table

OLEDW7500
SCLPA_9
SDAPA_10
GNDGND
VCCVCC

Software

Define Pins

SSD1306.h

#if defined(TARGET_WIZwiki_W7500)
#define SDA                  PA_10
#define SCL                  PA_9
#endif

Connect to NTP server

main.cpp

SNTPClient sntp("time.nist.gov", 40);   // timezone: Korea, Republic of
sntp.connect();

Get Time

main.cpp

if(sntp.getTime(&ntptime) == true)
    {
        pc.printf("%d-%d-%d, %d:%d:%d\r\n", ntptime.yy, ntptime.mo, ntptime.dd, ntptime.hh, ntptime.mm, ntptime.ss);
        wait(1.0);
    }
    else
    {
        while(sntp.getTime(&ntptime) != true)
        {
            //break;
        }
    }

Caution

watchout pins setting

Diff: main.cpp

Revision:
0:6e799e373101
Child:
1:f0c1fe04502c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Jun 26 00:56:23 2015 +0000
@@ -0,0 +1,121 @@
+#include "mbed.h"
+#include "EthernetInterface.h"
+#include "SNTPClient.h"
+#include "SSD1306.h"
+
+
+#if defined(TARGET_WIZwiki_W7500)
+    EthernetInterface eth;
+ /*   DigitalOut led1(LED1);
+    DigitalOut led2(LED2);
+    DigitalOut led3(LED3);
+    DigitalOut led4(LED4); */
+    DigitalIn  sw(PC_0);
+#elif 
+
+#endif
+TCPSocketConnection sock;
+
+DigitalOut myled(PA_6);
+
+Serial pc(USBTX, USBRX); // tx, rx
+
+datetime ntptime;
+struct tm timeinfo;
+
+
+int main()
+{
+  uint8_t mac_addr[6] = {0x00, 0x08, 0xDC, 0x00, 0x01, 0x02}; 
+  uint8_t count=0;
+  uint8_t time_x_offset =0;
+  uint8_t old_offset =0;
+
+  
+    init();
+    cls();
+    OLED_DrawBMP(0,0,128,8,(unsigned char *)wiznet);
+    wait(1);
+     cls();
+    eth.init(mac_addr); //Use DHCP
+    eth.connect();
+    
+   
+    printf("IP Address is %s\n\r", eth.getIPAddress());
+
+    SNTPClient sntp("time.nist.gov", 40);   // timezone: Korea, Republic of
+    sntp.connect();
+    if(sntp.getTime(&ntptime) == true)
+    {
+  //          printf("%d-%d-%d, %d:%d:%d\r\n", ntptime.yy, ntptime.mo, ntptime.dd, ntptime.hh, ntptime.mm, ntptime.ss);
+ //           wait(1.0);
+    }
+    else
+    {
+        while(sntp.getTime(&ntptime) == true)
+        {
+            break;
+        }
+    }
+
+      timeinfo.tm_mon = ntptime.mo-1;
+      timeinfo.tm_mday = ntptime.dd;
+      timeinfo.tm_hour = ntptime.hh;
+      timeinfo.tm_min = ntptime.mm;
+      timeinfo.tm_sec = ntptime.ss;
+      timeinfo.tm_year = ntptime.yy-1900;
+     // printf("%d-%d, %d:%d:%d\r\n", timeinfo.tm_mon, timeinfo.tm_mday, timeinfo.tm_hour, timeinfo.tm_min, timeinfo.tm_sec);
+      time_t t =mktime(&timeinfo);
+            
+      set_time(t);
+      t = time(NULL);
+     
+    while (1) {
+         char buffer[32];
+        time_t seconds = time(NULL);
+              
+       // printf("Time as a basic string = %s\r\n", ctime(&seconds));
+        if(count == 50)
+        {
+            cls();
+            count++;
+        }
+        if(count > 50)
+        {
+           time_x_offset =0;              
+           if(old_offset != time_x_offset){
+               old_offset = time_x_offset;
+            
+               }
+
+
+            //strftime (buffer,32,"%I:%M:%S ",localtime(&seconds));
+            strftime (buffer,32,"%I:%M",localtime(&seconds));
+            LED_P23x32Str(time_x_offset,3,buffer);
+
+            //intBigTime(buffer);
+            if(sw == 0)
+            {
+                count = 0;   
+                cls();
+            
+            }
+        
+        }
+        else
+        {
+           
+             strftime(buffer, 32,"%a %d %b %Y", localtime(&seconds));
+             OLED_ShowStr(10, 3, buffer,1 );
+             strftime(buffer, 32, "%I:%M:%S %p", localtime(&seconds));
+             OLED_ShowStr(10, 4, buffer,2 );
+             count ++;
+        }
+         
+         
+         
+         
+
+    }
+
+}