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Resetting Timer Unit used for Timer Interrupt

Question asked by Josiah Carlisle on Jul 23, 2019
Latest reply on Aug 1, 2019 by Josiah Carlisle

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I'm trying to use a timer to catch the end of a ModBus message. ModBus has a minimum delay time between messages, so my goal was to have the interrupt period be the minimum delay time, and have the timer reset whenever a new character is received. However, when I create a TimerInt component based off the TimerUnit component, the ResetCounter function because 'grayed-out'. I know this is a common method for determining the end of a ModBus message, so how would I go about doing this with Processor Expert?

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Alexis Andalon Jul 25, 2019 10:18 AM
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Dear Josiah Carlisle,

Could you let me know which MCU are you using?

Best Regards,
Alexis Andalon
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- Josiah Carlisle @ Alexis Andalon on Jul 29, 2019 5:30 AM
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  Thanks for the response. The chip is S9KEAZN64MLC2. The project is in Kinetis Design Studio with Processor Expert.
  -Josiah
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  - Alexis Andalon @ Josiah Carlisle on Jul 31, 2019 3:56 PM
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    Dear Josiah,
    
    In the description of this function there's the next note:
    
    But I think if you use the SetPeriodTicks could be a good replace to this function.
    
    Best Regards.
    Alexis Andalon
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    - Josiah Carlisle @ Alexis Andalon on Aug 1, 2019 9:42 AM
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      Alexis,
      
      Yes, I had seen that note, but I didn't think that was applicable, because when I create the TimerUnit component, I am able to enabled the ResetCounter function, but when I attach a TimerInt component to that TimerUnit, I am no longer able to use that function. Why would creating the Interrupt component disable that function?
      
      As for using the SetPeriodTicks function, are you suggesting that I simply continually move the goal time forward instead of resetting the counter? That might work. I'll give that a try.
      
      -Josiah
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      - Alexis Andalon @ Josiah Carlisle on Aug 1, 2019 10:32 AM
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        Hi Josiah,
        
        When you enable the interrupt the counter will be cleared when the interrupt is triggered, that's why this function disable the reset counter.
        
        Best Regards,
        Alexis Andalon
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        Josiah Carlisle @ Alexis Andalon on Aug 1, 2019 11:42 AM
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        I think I understand. So the interrupt is triggered by the reset, so resetting it would also trigger the interrupt. I want the interrupt to be triggered by the match, and then the counter to be reset, but that's not how it works, apparently.
        
        Thanks for your help,
        
        -Josiah
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Resetting Timer Unit used for Timer Interrupt

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