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TMS320F28035: GPIO toggle speed slows down at low temperature

Julia Li
Expert 3910 points
Part Number: TMS320F28035

Dear Champs,

 

I ask this for our customer.

Customer use the following statement to toggle GPIO:

GpioDataRegs.GPASET.bit.GPIO21 = 1;
while(error){cnt++;}  
GpioDataRegs.GPACLEAR.bit.GPIO21 = 1;

When "error" is always 0, they found that if they toggle GPIO at 25°C without adding a delay between the two lines of toggle code, it can be toggled normally.

But at low temperature(below 0℃), it cannot be toggled correctly, GPIO always outputs 0. It looks like "GpioDataRegs.GPASET.bit.GPIO21 = 1;" is not executed

If they add a delay() between GpioDataRegs.GPASET.bit.GPIO21 = 1 and GpioDataRegs.GPACLEAR.bit.GPIO21 = 1, GPIO will output 1 and then output 0.

So now customer want to know the cause of this issue. Is the GPIO toggle speed related to the temperature? Could we help analyze it? Thanks!

Best Regards,

Julia

  • 0
    TI__Prodigy 430 points

    Hello,

     

    Please note that our expert on this topic is currently out of office and expected to return on 27th Dec. Please expect a delay in response.

     

    Regards,

  • 0
    TI__Mastermind 30185 points

    Hello Julia,

    Has the customer verified there is no frost or other buildups occurring on the the GPIO pin that might cause other electrical problems? Is this isolated to this one GPIO pin? This one board? Does the same issue occur at higher temperatures (within datasheet specifications)?

  • 0 in reply to Omer Amir
    TI__Expert 3910 points

    Hi Omer,

    Customer just came back from vacation due to the holidays in China. I will confirm this with the customer and reply to you, thank you!

    Best Regards,

    Julia