CC3235MODASF: GPIO Pull-up don't seem to work

Benno E

Part Number: CC3235MODASF
Other Parts Discussed in Thread: SYSCONFIG

Hi,

Trying to get to know the SDK and module I'm trying to enable a GPIO pin as an input with the internal pull up enabled.

I'm using the portable project as a start and configured the GPIO as input with Internal PullUp enabled, but it doesn't work.

If I configure it a PullDown it does work. As the led is staying off and only lights when I put 3V on the input.

But when i Enable PullUp, the led even lights when I touch the pin header with my finger, so I think the pullup isn't enabled at that moment.

I've tried different GPIO pens to rule out any peripherals or board issues.

I've also disabled all tasks except this one which only is executing the code below...

What am I doing wrong?

I'm testing on the LAUNCHCC2335MOD

This is my code:

GPIO_setConfig(CONFIG_GPIO_IN_OPEN11, GPIO_CFG_IN_PD | GPIO_CFG_INT_DISABLE);

while(1){

GPIO_write(CONFIG_GPIO_LED_0, GPIO_read(CONFIG_GPIO_IN_OPEN11));

}

Thanks,

Benno

over 2 years ago

0 Sabeeh Khan1 over 2 years ago

TI__Mastermind 23880 points

Which version of the SDK are you using? Have you enabled the pin in SysConfig? Can you please share an image of SysConfig?

0 Benno E over 2 years ago in reply to Sabeeh Khan1

Prodigy 20 points

Hi,

I'm using SDK version 5.30.00.

I've enabled the pin in SysConfig. I'm using the Button driver app. I also tried without using the button app but configuring the GPIO pin as in my first post.

Thank you

0 Sabeeh Khan1 over 2 years ago in reply to Benno E

TI__Mastermind 23880 points

Hi,

Which GPIO pin are you trying to configure as internal with pull up? The SysConfig screenshot you shared does not have the name as you described in your code: "CONFIG_GPIO_IN_OPEN11"

Furthermore, I noticed you have 12 pins, can you please start with the Portable project from scratch? I'd like to verify that there are no other issues.

0 Sabeeh Khan1 over 2 years ago in reply to Sabeeh Khan1

TI__Mastermind 23880 points

Furthermore, instead of button driver, please use GPIO from sysconfig since that is how you are reading it.

0 Benno E over 2 years ago in reply to Sabeeh Khan1

Prodigy 20 points

Sorry, that wasn't very clear.

I tried both ways, so with Button driver app and since that didn't work I made the CONFIG_GPIO_OPEN11 pin as GPIO to try it the way I sent in my first post. To rule out everything I did the configuration myself as I sent in the example above. But that didn't work either.

So I tried with the Button driver app, including the function callbacks etc.

I also tried with GPIO with the generated source without configuring anything by myself.

I also tried GPIO with my own configuration, however I set the GPIO pin in SYSconfig at that point.

I'll try again with Portable, with 1 pin and let you know the results.

Thanks.

0 Sabeeh Khan1 over 2 years ago in reply to Benno E

TI__Mastermind 23880 points

Hi Benno,

Please also share the pin number you are testing on. I can test on my side to confirm any issues.

0 Benno E over 2 years ago in reply to Sabeeh Khan1

Prodigy 20 points

Hi Sabeeh,

I've used P05 as an input.

Thank you!

0 Sabeeh Khan1 over 2 years ago in reply to Benno E

TI__Mastermind 23880 points

Hi Benno,

You are seeing this issue when setting P05 to Pull up, correct?

0 Sabeeh Khan1 over 2 years ago in reply to Sabeeh Khan1

TI__Mastermind 23880 points

Hi Benno,

This issue is common. The pullup on the GPIO is very weak, so it can be triggered easily. I do not believe you are doing anything incorrect in the software.

0 Benno E over 2 years ago in reply to Sabeeh Khan1

Prodigy 20 points

Hi Sabeeh,

Yes, that's correct, I've also tried different pens, but all with the same result.

0 Benno E over 2 years ago in reply to Sabeeh Khan1

Prodigy 20 points

Hi Sabeeh,

Ok so in order to get rid of this issue I'll use external pull-ups.

Thank you for your time.

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CC3235MODASF: GPIO Pull-up don't seem to work