Timer Function implimentation in S32k

akhilranga — Thu, 15 Feb 2024 11:57:33 GMT

Hi there,

I am trying to build an Automotive application using S32k14x EAR SDK. In this i have few use cases which i want to acheive, but i belive i require a timer module to acheive them.

Mentionoing couple of use cases.

Use Case 1: Want to change the state of an Output pin High or Low after some milliseconds. when i receive a high signal from an Input Pin.

Use Case 2 : I want detect the duration of the pressed Push Button Input. i.e i want to apply a function to a push button upon pressing it for "x" milliseconds i need to get a confirmation/acknowledgement signal.

i belive these can be acheived using FTM OC component. But it would be helpful if any example codes are available for reference to acheive the above functions

Re: Timer Function implimentation in S32k

Julián_AragónM — Thu, 15 Feb 2024 20:32:23 GMT

Hi @akhilranga,

For Use Case 1, you can look into this example: Example: S32K148 GPIO Interrupt - NXP Community, pressing SW4 invoke interrupt and Interrupt handler toggles Green LED. If you need some specific time after the interruption, an implementation of the LPIT is possible: S32K SDK Example - Function call on configurable period using LPIT timer. - NXP Community.

However, I haven't seen an example for the S32K which implements the time for a button pressed. There are some examples implemented for the KW45EVB (kw45b41zevk_temperature_collector_freertos), which implement the fsl_component_button driver, including the different types of button events, measured by time thresholds with SW timer in FreeRTOS:

/*! @brief The event type of button */ typedef enum _button_event { kBUTTON_EventOneClick = 0x01U, /*!< One click with short time, the duration of key down and key up is less than #BUTTON_SHORT_PRESS_THRESHOLD. */ kBUTTON_EventDoubleClick, /*!< Double click with short time, the duration of key down and key up is less than #BUTTON_SHORT_PRESS_THRESHOLD. And the duration of the two button actions does not exceed #BUTTON_DOUBLE_CLICK_THRESHOLD. */ kBUTTON_EventShortPress, /*!< Press with short time, the duration of key down and key up is no less than #BUTTON_SHORT_PRESS_THRESHOLD and less than #BUTTON_LONG_PRESS_THRESHOLD. */ kBUTTON_EventLongPress, /*!< Press with long time, the duration of key down and key up is no less than #BUTTON_LONG_PRESS_THRESHOLD. */ kBUTTON_EventError, /*!< Error event if the button actions cannot be identified. */ } button_event_t;

This, however, is implemented in the KW45EVB and MCUXpresso, just for you information in case you find it useful. You can implement parts of this example into the first ones I shared.

Best regards,
Julián

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