Henry James

Important changes to forums and questions

All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.

6 years, 6 months ago.

How do I print out to the serial port, each second, the time starting at Tues Nov 28?

I have a Nucleo-F303RE and want to print out the time to the serial port starting at Tues Nov 28 00:00:00 2017

What is the code that I need to enter into my online compiler?

1 Answer

Zoltan Hudak
6 years, 6 months ago.

Hello Henry,

Try to copy and paste the code below into the online compiler and import the Clock library into the project. Then compile.

#include "mbed.h"
#include "Clock.h"

Serial pc(USBTX, USBRX);
Clock  rtc;

void onClockTick()
{
    time_t t = rtc.time();
    pc.printf("Time = %s", ctime(&t));
}

int main()
{
    rtc.attach(onClockTick);            // Attach a handler function
    rtc.set(2017, 11, 28, 00, 00, 00);  // Set the Clock to 2017, Nov, 28th, 0 hours, 0 minutes, 0 seconds

    while (1) { }
}

You might also have a look at the Clock_Hello example program.

Zoltan, thank you very much for your help.

I, unfortunately, couldn't get your clock programme to work. The aim of the task I have to do is to create a programme that prints the following to the serial port:

Time = Tue Nov 28 00:00:00 2017 Time = Tue Nov 28 00:00:01 2017 Time = Tue Nov 28 00:00:02 2017 Time = Tue Nov 28 00:00:03 2017 Time = Tue Nov 28 00:00:04 2017 etc

posted by Henry James 26 May 2018

Could you please spell out the issues you have (compilation , run time errors)?

posted by Zoltan Hudak 27 May 2018

I can't see any errors. The program compiles correctly, I just don't see the output in CoolTerm. I copied your code and added the clock library as you instructed.

posted by Henry James 27 May 2018

Close the CoolTerm program, disconnect and then reconnect your MBED board to the PC. Restart the CoolTerm program and click on the Options icon. Select STMicroelectronics STLink Virtual COM Port as your port. Make sure the Buadrate is set to 9600, Data Bits to 8, Parity to none, Stop Bits to 1 and no Flow Control is checked. Save your settings and see how it works.

posted by Zoltan Hudak 27 May 2018

I only have 2 options within the port dropdown menu - Bluetooth-Incoming-Port and usbmodemFD1313. I running this through an Apple OS, so don't have the ability to install the STMicroelectronics STLink Virtual COM Port

posted by Henry James 27 May 2018

I have managed to print "Hello World!" to CoolTerm, so I know that they can communicate

posted by Henry James 27 May 2018

Then select the same serial port as you did when printf("Hello World!") worked.

posted by Zoltan Hudak 27 May 2018

I have done that and I didn't get the output. I will try again. Do you use an Instant Messaging platform? As this is a rather cumbersome method of communicating :) I use Skype or Facebook messenger.

posted by Henry James 27 May 2018

I agree that it's far from being perfect. But on the other hand it could help other people to fix similar issues.
Unfortulately I have no experience with Apple OS. But this Tutorial explains MBED board to PC communication over USB.
NOTE: I have modified the code above (replaced printf with =pc.printf) to be in compliance with the that. However, the original version would work as good as the modified one.

posted by Zoltan Hudak 27 May 2018

I quite agree with your point about not using a private chat. Thank you for the tutorial link.

posted by Henry James 27 May 2018

This link might help too.

posted by Zoltan Hudak 27 May 2018