Diff: main.cpp

Revision:

0:9f741d395d17

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Aug 07 13:13:02 2014 +0000
@@ -0,0 +1,49 @@
+#include "mbed.h"
+
+Serial serial(USBTX,USBRX);
+
+void serialISR();  // ISR that is called when serial data is received
+void setTime();    // function to set the UNIX time
+int setTimeFlag = 0;  // flag for ISR
+
+char rxString[16];  // buffer to store received string
+
+int main()
+{
+    serial.attach(&serialISR);  // attach serial ISR
+    char buffer[30];  // buffer used to store time string
+    
+    set_time(0);  // initialise time to 1st January 1970
+
+    while(1) {
+
+        time_t seconds = time(NULL);  // get current time
+        // format time into a string (time and date)
+        strftime(buffer, 30 , "%X %D", localtime(&seconds));
+        // print over serial
+        serial.printf("Time = %s\n",buffer);
+        wait(1.0);  // delay for a second
+        
+        if (setTimeFlag) {  // if updated time has been sent
+            setTimeFlag = 0;  // clear flag
+            setTime(); // update time
+        }
+    }
+
+}
+
+void setTime() {
+    // print time for debugging
+    serial.printf("set_time - %s",rxString);
+    // atoi() converts a string to an integer
+    int time = atoi(rxString);
+    // update the time
+    set_time(time);
+}
+
+void serialISR() {
+    // when a serial interrupt occurs, read rx string into buffer
+    serial.gets(rxString,16);
+    // set flag
+    setTimeFlag = 1;    
+}