Community Contributors / USBSerial-RTC-HelloWorld

Teensy3.1 USB Serial and RTC test. Use this program to check the operation of the RTC after the 32KHz crystal has been fitted. If a back up cell has also been fitted the RTC will remain running after the main power has been removed. Reconnect the USB to the PC and the RTC time will be displayed when using a PC terminal program.

Dependencies:   USBDevice mbed-src

Fork of USBSerial-RTC-HelloWorld by Community Contributors

Files at this revision

API Documentation at this revision

Revision 12:f4e5544977c2, committed 2015-09-30

Comitter:
star297
Date:
Wed Sep 30 22:24:41 2015 +0000
Parent:
11:7bf81089fce6
Commit message:
Added clock rate display output

Changed in this revision

USBDevice.lib Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file 
diff -r 7bf81089fce6 -r f4e5544977c2 USBDevice.lib
--- a/USBDevice.lib	Mon Jun 15 23:10:36 2015 +0000
+++ b/USBDevice.lib	Wed Sep 30 22:24:41 2015 +0000
@@ -1,1 +1,1 @@
-http://developer.mbed.org/users/star297/code/USBDevice/#322588ae9094
+http://mbed.org/users/mbed_official/code/USBDevice/#2af474687369

diff -r 7bf81089fce6 -r f4e5544977c2 main.cpp
--- a/main.cpp	Mon Jun 15 23:10:36 2015 +0000
+++ b/main.cpp	Wed Sep 30 22:24:41 2015 +0000
@@ -2,9 +2,13 @@
 
 // Requires 32KHz crystal fitted.
 // Unplug then plug back in the Teensy after programing to reactivate the Teensy USB serial port.
+// if your terminal program can't see the Teensy
 
 #include "mbed.h"
 #include "USBSerial.h"
+
+// include to check/display clock rates
+#include "clk_freqs.h"
  
 //Virtual serial port over USB
 USBSerial serial;
@@ -12,12 +16,12 @@
 DigitalOut led(LED1);
 
 struct tm t;
-char timebuff[60];
+char timebuff[80];
 
-int minute      =35;    // 0-59
-int hour        =18;    // 0-23
-int dayofmonth  =14;    // 1-31
-int month       =6;     // 1-12
+int minute      =20;    // 0-59
+int hour        =23;    // 0-23
+int dayofmonth  =30;    // 1-31
+int month       =9;     // 1-12
 int year        =15;    // last 2 digits
  
 void setRTC()
@@ -33,13 +37,22 @@
  
 int main(void) {
  
-    setRTC(); // If back up cell fitted, comment this out after the RTC has been set then re-program.  
+    led=1;
+    
+    //setRTC(); // If back up cell fitted, comment this out after the RTC has been set then re-program.  
     
     while(1)
     {   
         time_t seconds = time(NULL);
-        strftime(timebuff,60,"Teensy RTC\r\nTime:  %H:%M:%S\r\nDate:  %A %d %B %Y\r\n\n", localtime(&seconds));       
-        serial.printf(timebuff);
+        strftime(timebuff,80,"\n\n Teensy RTC\r\nTime:  %H:%M:%S\r\nDate:  %A %d %B %Y\n\n", localtime(&seconds));       
+        serial.printf(timebuff);       
+        
+        serial.printf("\n core %d",SystemCoreClock);
+        
+        serial.printf("\n Bus  %d",bus_frequency());
+        
+        serial.printf("\n Osc  %d",extosc_frequency());
+        
         led=0;        
         wait(1);
         led=1;