F2837xD - GPIO20 IO problems

Will D

Dear TI,

I am currently using your new F2837xD micro, which for the most part is a fantastic part!

However, I am having an issue with toggling GPIO20. I have attached some images which show how I setup two GPIOs 19 and 20 as outputs, and then toggle theirs outputs high. GPIO 19 works as expected, however 20 never seems to switch states. We have three of your control boards and the issue happens on all three.

Image 1: Pre-setting the GPIOs as output - GPADIR are both 0.

Image 2: Post-setting the GPIOs as output - GPADIR are both 1.

Image 3: Post-setting and Pre-setting GPIOs high - GPADAT are both 0.

Image 4: Post-setting GPIOs high - GPADAT.GPIO19 = 1, but GPADAT.GPIO20 = 0

Is there a problem with the code or is there a bug on the silicon?

Many thanks for your help.

over 10 years ago

0 Gautam Iyer over 10 years ago

Guru 192875 points

Hi Will,

Try this:

EALLOW;

GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 0;  // GPIO19 = GPIO19
GpioCtrlRegs.GPADIR.bit.GPIO19 = 1;   // GPIO19 = output

GpioCtrlRegs.GPAMUX2.bit.GPIO20 = 0;  // GPIO20 = GPIO20
GpioCtrlRegs.GPADIR.bit.GPIO20 = 1;   // GPIO20 = output

EDIS;

GpioDataRegs.GPASET.bit.GPIO19 = 1;
GpioDataRegs.GPASET.bit.GPIO20 = 1;

Regards,

Gautam

0 Will D over 10 years ago in reply to Gautam Iyer

Prodigy 120 points

Hi Gautam,

Thanks for the quick reply. I have just imported that code and tried it - same result GPIO20 remains low. I have managed to toggle probably 60 other GPIOs on this micro, but for some reason this one is stuck.

Are you or someone at TI able to replicate this problem on your own F2837xD eval kit. It is a pretty simple test to setup?

And this I don't think is a CCS debug problem as the physical pin never toggle either.

Will

0 Gautam Iyer over 10 years ago in reply to Will D

Guru 192875 points

Are you or someone at TI able to replicate this problem on your own F2837xD eval kit. It is a pretty simple test to setup?

Currently on travel, so don't have access to my kits. But if you toggle GPIO20 with some delay in between; what does your scope (DSO) say? (ignore the watch window for now)

Are you able to observe the toggling on DSO? If not then the matter looks a bit intense.

Also, at the same time do toggle GPIO19 too; so that we can compare the results on 2 channels.

Regards,

Gautam

0 Will D over 10 years ago in reply to Gautam Iyer

Prodigy 120 points

Gautam,

I did as suggested above, and in the process disconnected a peripheral device further down the chain. This device was accidentally holding the line low, and in the process this was seen in both HW and SW.

Thanks for your help - it help me solve the problem.

A final question, when are you looking to release the F2837xD. I can see that samples are available however when are pre/production qtys going to be available.

Many thanks.

0 Gautam Iyer over 10 years ago in reply to Will D

Guru 192875 points

Thats Great, Will!

A final question, when are you looking to release the F2837xD. I can see that samples are available however when are pre/production qtys going to be available.

I don't work for TI (you can check out my profile). I'll forward your query to a TI buddy of mine who'll respond to your query.

Do close the thread when you get your answers :)

Regards,

Gautam

0 Loretta Faluade over 10 years ago in reply to Gautam Iyer

TI__Intellectual 1910 points

Hi Will,

Production samples will be available December this year.

Loretta

0 Gautam Iyer over 10 years ago in reply to Loretta Faluade

Guru 192875 points

Thanks Loretta, for the info.

Regards,

Gautam

0 Loretta Faluade over 10 years ago in reply to Gautam Iyer

TI__Intellectual 1910 points

You're very welcome!

0 Will D over 10 years ago in reply to Loretta Faluade

Prodigy 120 points

Many thanks to you both.

Will

0 Gautam Iyer over 10 years ago in reply to Will D

Guru 192875 points

Welcome Will. I would like you to close this thread by verifying the answer.

Regards.

Gautam

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F2837xD - GPIO20 IO problems