topic Re: ADC/GPIO/Clock Startup Stumper in Kinetis Microcontrollers

ADC/GPIO/Clock Startup Stumper

codyhubman — Mon, 17 Feb 2020 16:09:32 GMT

Came across an interesting issue and currently not satisfied with the "fix" performed. Some background, during testing of the MKEAZ128 chip a custom control board an issue was found that seemed to be an issue with the thermistor placed on A6 (which I recognize is defaulted to ADC). Once the Thermistor reached ~90 F the processor started to get hung up and wouldn't connect to the controller. Soon we found out the processor would work with no issues at those temperatures if it was on before turning it up that high. After further investigation SystemInit() was getting hung up at the following spot.

What is in red is where the code would get hung up. However, When adding the code in blue (pin A0) everything would work fine and the proper clock would be selected. Any hints on why this is a problem? For now we are continuing testing and this weird code works. (The A0 pin is tied to a 10k resistor and goes out to a header.) However I still am not satisfied with not understanding this. Any hints, suggestions, or reasoning would be greatly appreciated! Thank you!

-Cody

Re: ADC/GPIO/Clock Startup Stumper

codyhubman — Mon, 17 Feb 2020 18:54:31 GMT

A little update. When I did the LED blink code on a pin that was not defaulted to ADC it no longer worked. I tried A1 then instead of A0 (which is another ADC default pin) the code booted fine. So I guess the question is now... What with my ADC might be causing this to get hung up. To summarize my issues...

When I heat the thermistor the bootup code never selects a clock unless I write a 1 to a GPIO pin with ADC selected as the default.

Re: ADC/GPIO/Clock Startup Stumper

kerryzhou — Wed, 19 Feb 2020 03:26:44 GMT

Hi cody hubman,

When you meet the code is stopping your red area:

From the RM register:

So, when you code stop there, it means your external OSC is stopping oscillating, you can check your hardware, check the osc pin, whether it is oscillating or not.

BTW, you also can try to use the internal IRC, whether you still have this problems or not?

Have a great day,
Kerry

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Re: ADC/GPIO/Clock Startup Stumper

codyhubman — Wed, 19 Feb 2020 04:23:43 GMT

I'll check. Let me provide more clarity.

It stops in the red loop automatically if I have a thermistor heated when I turn on the chip. For some reason. If I drive a "1" on an ADC default pin it continues normally.

I'm trying to figure out what in the ADC is causing the ICS to not be able to select the external clock as the source. Im assuming something with the ADC is causing an interrupt.

Here's my challenge. In Debug it completely ignores this and boots up anyways. So I'm unable to find where in the code it goes when I turn it on with the thermistor heated.

All I know is that when I activate an ADC pin (Code in blue) it works unless the pin I activate for the code in blue is defaulted to DISABLED.
I hope this helps provide clarity I really want to figure out what I'm missing.

-Cody

Re: ADC/GPIO/Clock Startup Stumper

kerryzhou — Wed, 19 Feb 2020 06:27:45 GMT

Hi cody hubman,

Please use the FEI clock mode, to test your ADC pin in the same situation again, whether you have problems?

If you use the FEI mode, you won't go the red code which you mentioned.

Have a great day,
Kerry

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Re: ADC/GPIO/Clock Startup Stumper

codyhubman — Wed, 19 Feb 2020 17:34:45 GMT

I tried the clock setup 0 which says that it uses the FEI clock mode but when heating the thermistor it still never makes it through the clock setup.

Do I need to disable ADC before configuring my clocks? Or something like that?

Re: ADC/GPIO/Clock Startup Stumper

codyhubman — Wed, 19 Feb 2020 18:17:59 GMT

I tried all the different clock configurations. No success though

Re: ADC/GPIO/Clock Startup Stumper

kerryzhou — Thu, 20 Feb 2020 02:23:36 GMT

Hi cody hubman,

When you use the FEI mode, where you are stopping? Please give me you test result！

BTW, please tell me which code you are using? The NXP official code? Which IDE?

Have a great day,
Kerry

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Re: ADC/GPIO/Clock Startup Stumper

codyhubman — Thu, 20 Feb 2020 03:00:47 GMT

So this is in the MKE06Z.C startup code file and it's part of a prebuilt setup in Kinetis Design Studio. I assume this is NXP official code. Clock Setup 0 or 1 suggests it starts with FEI. But It gets stuck on a similar while loop. (I think). I'm also not sure if there is an interrupt causing an issue but idk why that would be the case.

Im so thrown off why my thermistor would be affecting my ICS selection. It works perfectly fine if I activate any random ADC Default GPIO before it checks to see which clock has been selected. I'm not at work now otherwise I would have posted the rest.

It only takes about 5 seconds of blowing the heat gun on the thermistor too for it to get hung up on the ICS code.

Re: ADC/GPIO/Clock Startup Stumper

kerryzhou — Thu, 20 Feb 2020 03:18:34 GMT

Hi cody hubman,

Do you mean PTA6 will cause the problem?

When you can test the project, please test the following case:

1. Before you do the clock mode settings, you can try to configure the PTA6 as the GPIO function instead of the ADC function.

Then heat the PTA6 again, whether you still have problems, please note, you need to make sure the Temperature range (ambient): -40 to 125°C.

2. You can try my attached KDS KEA PE simple project, you can add some LED blinky refer to your own board, then test it again without modify the PTA6 pin function, whether the problem still exist.

After you test it, please let me know the result.

Waiting for your updated information.

Have a great day,
Kerry

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Re: ADC/GPIO/Clock Startup Stumper

codyhubman — Thu, 20 Feb 2020 03:27:15 GMT

Yes, PTA6 is causing my problem. However I went back and seen if this error occurred on past boards with a different pin assignment for the thermistor and it still happened.

I assume your suggestion will work. That code that I added in blue also worked and as long as I configure any ADC GPIO to drive a 1 before I do my clock settings everything works perfectly fine. Im just trying to figure out why my A6 with the thermistor would affect setting up my clock

Re: ADC/GPIO/Clock Startup Stumper

kerryzhou — Thu, 20 Feb 2020 03:29:50 GMT

Hi cody hubman,

Except the PTA6 ADC with thermistor, do you check any other ADC pins with thermistor, whether other ADC pins also have this issue or not?

Have a great day,
Kerry

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Re: ADC/GPIO/Clock Startup Stumper

codyhubman — Thu, 20 Feb 2020 04:04:21 GMT

Ill double check tomorrow which pin I used but I did try this on an old board that I was prototyping with that ran a 44pin instead of a 64 pin KE06z and the thermistor caused the startup code to not finish with that model as well. Im pretty sure I didn't have it on the A6 tomorrow but I will verify that tomorrow

Re: ADC/GPIO/Clock Startup Stumper

kerryzhou — Thu, 20 Feb 2020 04:18:03 GMT

Hi cody hubman,

Do you mean KE06 alao have this problems?

Do you have any NXP official KEA128 or KE06 board? Can you reproduce the problem on the NXP official board as well?

Have a great day,
Kerry

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Re: ADC/GPIO/Clock Startup Stumper

codyhubman — Thu, 20 Feb 2020 04:22:54 GMT

So far what I the ones I have dealt with too but these were all on Proto-boards. I do have a FRDM KE06z board that I can try to reproduce the problem but I didn't have enough time today. I will also report those findings tomorrow

Re: ADC/GPIO/Clock Startup Stumper

kerryzhou — Thu, 20 Feb 2020 06:56:17 GMT

Hi cody hubman,

It doesn't matter, after you find time to test it, just share your test result with me.

Have a great day,
Kerry

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Re: ADC/GPIO/Clock Startup Stumper

codyhubman — Thu, 20 Feb 2020 17:52:24 GMT

It was a different ADC pin that causes a crash for my past boards... However I did try setting up a thermistor on the KE06z freedom board and it seemed to hand the clock setup without any issues so I'm suspicious that it's a hardware issue somewhere. Could it be a filtering issue from the thermistor?

Re: ADC/GPIO/Clock Startup Stumper

kerryzhou — Fri, 21 Feb 2020 02:19:44 GMT

Hi cody hubman,

Check your KEA chip, whether it is the same package as the FRDM-KE06 board? If yes, you can replace the FRDM-KE06 chip to the KEA chip, then test it again, whether it has problems or not? Just check whether it is related to the PCB layout interference.

Have a great day,
Kerry

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Re: ADC/GPIO/Clock Startup Stumper

codyhubman — Fri, 21 Feb 2020 02:23:01 GMT

It is a similar problem to my KEA128 64 pin, 44 pin ke06z128, and 64 pin ke06z128. Because It doesn't seem to be an issues with the FRDM board I am suspicious that it is a hardware problem... It's a really weird problem

Re: ADC/GPIO/Clock Startup Stumper

kerryzhou — Fri, 21 Feb 2020 02:31:41 GMT

Hi cody hubman,

A test thought for your own board, but you need to do it very carefully.

Find a tweezer, just move the PTA6 pin leave your own PCB, then heat the pin again, whether you still have problems or not?

It seems your hardware is influenced by your thermistor, maybe some interference flow to the power, the crystal, or the ground signals.

Have a great day,
Kerry

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