Something about configuring GPT may be wrong in MCUXpresso Config Tools

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Something about configuring GPT may be wrong in MCUXpresso Config Tools

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Contributor I

Hey,   Recently while i use MCUXpressoIDE & MCUXpresso Config Tools to generate GPT1 & GPT2 configurations automatically for my project, I found out there may be something incorrect about `compare value`, showing as follows:

121511296_2-1601027157579.png

 

And my IRQ shows like this:

```C

extern "C" void GPT1_IRQHandler()
{
/* Clear interrupt flag.*/
GPT_ClearStatusFlags(GPT1_PERIPHERAL, kGPT_OutputCompare1Flag);
TOGGLE(GPIO_AD_B1_06);

/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
__DSB();
#endif
}


extern "C" void GPT2_IRQHandler()
{
/* Clear interrupt flag.*/
GPT_ClearStatusFlags(GPT2_PERIPHERAL, kGPT_OutputCompare1Flag);
TOGGLE(GPIO_AD_B1_07);

/* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
exception return operation might vector to incorrect interrupt */
#if defined __CORTEX_M && (__CORTEX_M == 4U)
__DSB();
#endif
}

```

Then I captured the pin logic, like this:

121511296_1-1601027071127.png

121511296_3-1601027316285.png

Then I realized that same thing happened before while i use the same processor and same gpt, which is that the actual compare value is 1 more than its setting value, while it cannot be set as zero in MCUXpresso Config Tools(showing as follow). So it leads to one more microsecond for every microseconds.(I guess.)

121511296_4-1601027628907.png

 

So, I am a little confused. Am I right about this?

 

 

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1 Reply

48 Views
NXP TechSupport
NXP TechSupport

Hi

 

Thank you for your feedback, could you please let me know which MCU and the SDK version you are using?

 

Regards

Daniel

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