MCUXpresso Config ToolsのトピックPIT Ticks off by one

PIT Ticks off by one

IdrisCodes — Sat, 18 Dec 2021 18:29:10 GMT

Hello,

I'm using MCUXpresso IDE v11.4.1 with the FRDM-K64F SDK v2.10.0

I noticed that the PIT configuration tool creates a #define called PIT_X_TICKS with the number of ticks minus 1.

The PIT driver function PIT_SetTimerPeriod also subtracts 1 from the parameter before updating the PIT reload value.

I believe this should be changed in the config tool.

Thanks

Re: PIT Ticks off by one

diego_charles — Wed, 22 Dec 2021 22:21:30 GMT

Hi @IdrisCodes

Thank you for noticing this! I will escalate the below report.

In the SDK PIT example we can see:

PIT_SetTimerPeriod(DEMO_PIT_BASEADDR, DEMO_PIT_CHANNEL, USEC_TO_COUNT(1000000U, PIT_SOURCE_CLOCK));

Where the USEC_TO_COUNT is only decremented by one inside the function.

But if we use Config tools to do PIT setup :

#define PIT_CHANNEL_0_TICKS USEC_TO_COUNT(100000U, PIT_CLK_FREQ) - 1U

PIT_SetTimerPeriod(PIT_PERIPHERAL, PIT_CHANNEL_0, PIT_CHANNEL_0_TICKS);

The USEC_TO_COUNT is decremented by one twice, by the define generated by config tools and the function.

Thank you.

Diego.

Re: PIT Ticks off by one

diego_charles — Mon, 27 Dec 2021 16:29:40 GMT

Hi @IdrisCodes

I just wanted to let you know that our SW team is now aware of the error that you reported.

According changes will be made whenever possible. Please note that we do not have any expected date for this.

Thank you for your understanding and for reporting this.

Diego.

Re: PIT Ticks off by one

marek_neuzil — Wed, 05 Jan 2022 13:38:20 GMT

Hello,

Thank you for reporting the issue. I have analyzed it. The latest version of the PIT driver has been updated to decrement the count value by one in the PIT_SetTimerPeriod() function. A new version of the PIT component has been created and it will be available in the upcoming release MCUXPresso Config Tools V11.

Best Regards,

Marek Neuzil