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
main.cpp
- Committer:
- star297
- Date:
- 2015-06-15
- Revision:
- 11:7bf81089fce6
- Parent:
- 10:5a7c14815199
- Child:
- 12:f4e5544977c2
File content as of revision 11:7bf81089fce6:
// Teensy3.1 USB Serial, RTC test // Requires 32KHz crystal fitted. // Unplug then plug back in the Teensy after programing to reactivate the Teensy USB serial port. #include "mbed.h" #include "USBSerial.h" //Virtual serial port over USB USBSerial serial; DigitalOut led(LED1); struct tm t; char timebuff[60]; int minute =35; // 0-59 int hour =18; // 0-23 int dayofmonth =14; // 1-31 int month =6; // 1-12 int year =15; // last 2 digits void setRTC() { t.tm_sec = (0); // 0-59 t.tm_min = (minute); // 0-59 t.tm_hour = (hour); // 0-23 t.tm_mday = (dayofmonth); // 1-31 t.tm_mon = (month-1); // 0-11 "0" = Jan, -1 added for Mbed RCT clock format t.tm_year = ((year)+100); // year since 1900, current year + 100 + 1900 = correct year set_time(mktime(&t)); // set RTC clock } int main(void) { 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); led=0; wait(1); led=1; } }