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

main.cpp@10:5a7c14815199, 2015-06-14 (annotated)

Committer:
star297
Date:
Sun Jun 14 18:11:07 2015 +0000
Revision:
10:5a7c14815199
Parent:
9:d88699a0905a
Child:
11:7bf81089fce6
V1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
star297 10:5a7c14815199 1 // Teensy3.1 USB Serial, RTC test
star297 10:5a7c14815199 2
star297 10:5a7c14815199 3 // Requires 32KHz crystal fitted.
star297 10:5a7c14815199 4 // Unplug then plug back in the Teensy after programing to reactivate the Teensy USB serial port.
star297 10:5a7c14815199 5
samux 7:5e693654d5b4 6 #include "mbed.h"
samux 7:5e693654d5b4 7 #include "USBSerial.h"
samux 7:5e693654d5b4 8
samux 7:5e693654d5b4 9 //Virtual serial port over USB
samux 7:5e693654d5b4 10 USBSerial serial;
star297 10:5a7c14815199 11
star297 10:5a7c14815199 12 DigitalOut led(LED1);
star297 10:5a7c14815199 13
star297 10:5a7c14815199 14 struct tm t;
star297 10:5a7c14815199 15 char timebuff[60];
star297 10:5a7c14815199 16
star297 10:5a7c14815199 17 int minute =35; // 0-59
star297 10:5a7c14815199 18 int hour =18; // 2-23
star297 10:5a7c14815199 19 int dayofmonth =14; // 1-31
star297 10:5a7c14815199 20 int month =6; // 1-12
star297 10:5a7c14815199 21 int year =15; // last 2 digits
star297 10:5a7c14815199 22
star297 10:5a7c14815199 23 void setRTC()
star297 10:5a7c14815199 24 {
star297 10:5a7c14815199 25 t.tm_sec = (0); // 0-59
star297 10:5a7c14815199 26 t.tm_min = (minute); // 0-59
star297 10:5a7c14815199 27 t.tm_hour = (hour); // 0-23
star297 10:5a7c14815199 28 t.tm_mday = (dayofmonth); // 1-31
star297 10:5a7c14815199 29 t.tm_mon = (month-1); // 0-11 "0" = Jan, -1 added for Mbed RCT clock format
star297 10:5a7c14815199 30 t.tm_year = ((year)+100); // year since 1900, current DCF year + 100 + 1900 = correct year
star297 10:5a7c14815199 31 set_time(mktime(&t)); // set RTC clock
star297 10:5a7c14815199 32 }
samux 7:5e693654d5b4 33
samux 7:5e693654d5b4 34 int main(void) {
samux 9:d88699a0905a 35
star297 10:5a7c14815199 36 setRTC(); // If back up cell fitted, comment this out after the RTC has been set then re-program.
star297 10:5a7c14815199 37
samux 7:5e693654d5b4 38 while(1)
star297 10:5a7c14815199 39 {
star297 10:5a7c14815199 40 time_t seconds = time(NULL);
star297 10:5a7c14815199 41 strftime(timebuff,60,"Teensy RTC\r\nTime: %H:%M:%S\r\nDate: %A %d %B %Y\r\n\n", localtime(&seconds));
star297 10:5a7c14815199 42 serial.printf(timebuff);
star297 10:5a7c14815199 43 led=0;
samux 9:d88699a0905a 44 wait(1);
star297 10:5a7c14815199 45 led=1;
samux 7:5e693654d5b4 46 }
star297 10:5a7c14815199 47 }
star297 10:5a7c14815199 48