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POOJA_1227
Associate
February 23, 2024
Question

TIMER SYSCHRONISATION

  • February 23, 2024
  • 2 replies
  • 2349 views

I am using STM32F446RE microcontroller and using MATLAB to develop the logic. Upon launching StmCubeMx, I have kept the clock frequency as 90MHz and 10% duty cycle for TIM1, TIM2, TIM3. So, it gives same output frequency of the pulses (PWM_Output.png) from each PWM. Model screenshot is also attached (model.PNG). All 3 timer settings have been kept same as shown in (Timer_setting.PNG). I want all the 3 pulses shall be in phase. How can I achieve that?

Hoping to hear soon!

Thanks in advance!

 

PWM_Output.pngTimer_setting.PNGmodel.PNG

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2 replies

waclawek.jan
waclawek.jan
Super User
February 23, 2024

The simplest thing is to:

- set up all three timers completely, but don't enable them yet

- disable interrupts globally

- enable all the timers

- reenable interrupts globally

There may still be a small phase difference, you can compensate for it by setting CNT of each timer to a small value before enabling.

A more rigorous method is to use the master-slave connection of timers, but that's also more complicated.

JW

P
POOJA_1227Author
Associate
February 26, 2024

Thank You JW. I tried this and as you said there is still small phase shift, trying to compensate that. 

Michal Dudka
Michal Dudka
Lead
February 23, 2024

If you need precise synchronisation, use master-slave connection like JW suggest. It is described in Reference manual in "17.3.15 Timer synchronization". 

BTW: To generate three PWMs, you can use just one timer.

    P
    POOJA_1227Author
    Associate
    February 26, 2024

    Thanks @@Michal DudkaDudka, I will once go through manual. 

    And I Want to generate 6 pulses.

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