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How to latch FTM_MOD counter on falling edge

Question asked by Nitin verma on Oct 17, 2017
Latest reply on Nov 23, 2017 by Razvan-nicolae Tilimpea

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Dear support team,

We are working with S32K144 device. We want to latch the falling edges of signal coming on FTM0_CH1.

This signal is generated using FTM0_CH0 port. We want to configure FTM0_CH1 in such way that on falling edge

FTM_MOD counter value should be latched and not get reset. I tried to implement this using Global Base Timer

feature of FTM. I am unable to configure it properly and don't know how to read latched value using this feature

(As I am trying this for single module with 2 different channels). Please help us if it is possible to implement using GBT.

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Daniel Martynek Oct 20, 2017 6:49 AM
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Hi,
Sorry but I have difficulties to understand. Could you reformulate the question?
The GTB function allows synchronization of multiple FTMs, but you want to use just one FTM.

Regards,
Daniel
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- Nitin verma @ Daniel Martynek on Nov 1, 2017 11:45 PM
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  Dear Daniel
  Yes I have read from datasheets and articles available that GTB function is used for synchronization of multiple FTM's. But my requirement is to generate pwm using FTM0_CH0 and then I want to know the duty cycle of that generated pwm for diagnosis purpose but using another channel of same FTM module. So my query is can we use GTB function to implement above requirement or do we have another provision to implement above requirement . We can't configure other channel of same module(through which we are generating the PWM) as ICU.
  Please guide me through this.
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  - Daniel Martynek @ Nitin verma on Nov 5, 2017 2:33 PM
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    Hi,
    Sorry, I don't see any way to connect internally FTM0_ch0 PWM output with FTM0_Ch1 IC input.
    
    Regards,
    Daniel
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  - Razvan-nicolae Tilimpea @ Nitin verma on Nov 23, 2017 3:26 AM
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    Hi,
    
    GTB is used to have the same timebase for more FTM modules. All FTM channels are connected to the same timebase, so this feature won't help you.
    
    I don't understand exactly your usecase, but why you need to know the value of the duty cycle( which is stored in CnV, not in MOD)? The application knows the value configured as duty and you can compare it with the value obtained by FTM channel configured as input capture.
    
    Best regards,
    Razvan
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How to latch FTM_MOD counter on falling edge

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