Clock runs too slow

Question

I have to display the current time in my application. The time is set by an external clock via serial port using EwBspSetTime().

For displaying I'm using Core::Time time = Time.CurrentTime;

The displayed time in the GUI application runs much slower than the real time. In one minute more than 10 seconds are lost.

Answer 1

Hello,

the function EwBspSetTime() is not part of the Build Environment - so I assume you have implemented that function.

If you are using the RTC of your hardware, please check the clock settings / clock sources for the RTC.

For that purpose, let me refer to the following application notes:

AN3371 - Using the hardware real-time clock (RTC) in STM32 F0, F2, F3, F4 and L1 series of MCUs

AN4759 - Using the hardware real-time clock (RTC) in low-power modes with STM32 microcontrollers

Both documents describes the RTC configuration.

Hope this helps...

Best regards,

Manfred.

 

Comments

Since I receive the time from external sources, I do not really need the RTC.

Does EW or FreeRTOS require to use the RTC?

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There is no requirement for Embedded Wizard (Runtime Environment or Graphics Engine or the GUI application itself) to have access to RTC.

If your UI application is using Core::Time in order to query the current time, then EwGetTime() is called (which calls EwBspGetTime()). Here you can returnt the time from any time source of your choice.