LPIT counter reset

AjRj14 — Wed, 01 Dec 2021 05:56:45 GMT

Hi,

I am generating a 10ms ISR using LPIT.

Also I am capturing a PWM signal in FTM0 channel. I want to reset the LPIT counter whenever an edge is detected in FTM0 channel.

Could you please tell me how can I reset the LPIT counter.

Thanks in Advance.

Re: LPIT counter reset

Robin_Shen — Thu, 02 Dec 2021 06:40:45 GMT

When set TROT, the LPIT timer will reload when a rising edge is detected on the selected trigger input.

But the trigger source from FlexTimer are FTMx_INIT_TRIG and FTMx_EXT_TRIG
FTMx_INIT_TRIG: counter initialization trigger
FTMx_EXT_TRIG: channel match trigger
These two trigger source from FlexTimer don’t seem to be suitable for your application.

Writing to MISCTRL1[SW_TRG] generates software trigger to peripherals through TRGMUX.

But seems using another FTM may more easier: configure another FTM works as simple timer.

Or using LPTMR, software reset the counter in ISR.

Best Regards,
Robin
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Re: LPIT counter reset

AjRj14 — Thu, 02 Dec 2021 10:48:31 GMT

Thanks very much Robin.

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