GPIO can't be controlled

[LanceTaiwan]

Hi,

     I encountered a very strange issue.  I need to control a device using GPIO.  What I use is p0.22/p0.02/p0.03/p1.11/p0.31/p0.30.  I modify the app.overlay file and check the final zephyr.dts which is correct.  But when I use the gpio_pin_set_dt to control those GPIO, the results are not as I expected.

p0.22 , can't control, always 1
p0.02 ,can't control, always 0
p0.03 ,can't control, always 0
p1.11 , OK
p0.31 , OK
p0.30 ,can't control, always 0

   In my project, I also control the other GPIO p0.5/p1.15/p1.14/p1.1/p1.0 using the same method and those GPIO work well.  I check the issue again and again and I can't find anything wrong.  

My questions are

1. Is it possible the pins are overlapping assignments? ( I checked zephyr.dts already, another way to check it? )
2. Is it possible those pins can't be used as GPIO? p0.22/p0.02/p0.03/p0.30

Thanks

[Marte Myrvold]

Hi,

Some of the pins you are using are, by default, used by other peripherals.

P0.22 is used by the UART0, P0.02 and P0.03 are used by NFC, and P0.30 is used by the coex interface.

In order to use the NFC pins as GPIO, you must set CONFIG_NFCT_PINS_AS_GPIOS=y in your configuration, see nrF7002 DK - NFC antenna interface. To use the other pins, you must disable UART and the coex interface. I would recommend checking the nRF7002 DK hardware user guide and the board files to see which pins are already taken.

Best regards,
Marte

[LanceTaiwan]

Hi,

    Thanks for your support.  Now I can configure ALL gpio.   The other question is, I can use

    # nrfjprog --family nrf53 --memwr 0x00FF8010 --val 5

    to config the GPIO to 3.3v.  My question is, how can I do this in c code?

[Sigurd Hellesvik]

Hi,

I will continue to help with this ticket.

LanceTaiwan said:

    to config the GPIO to 3.3v.  My question is, how can I do this in c code?

What do you mean "config to 3.3v"?

Do you mean that you will set it to output and high?

Or to configure it as pull-up?

Or to change its specific voltage level?

LanceTaiwan said:

    # nrfjprog --family nrf53 --memwr 0x00FF8010 --val 5

How did you find this command? What is the register you write to?

Regards,
Sigurd Hellesvik

[LanceTaiwan]

Hi,

    sorry' let me make it clear.

    Currently if I use API to set gpio to high (V1.8) using  gpio_pin_set_dt(&dispen, 1) 

     and set gpio to low(V0) using gpio_pin_set_dt(&dispen, 0).

     But I need to use 3.3V to control Peripherals.  

  For your questions.

What do you mean "config to 3.3v"?
>>> change its specific voltage level

How did you find this command? What is the register you write to?
>>> Using nRF5340-PDK at 3.3V instead of 1.8V 

My question is, can I write a c code to configure it?

  

[Sigurd Hellesvik]

From what I know about the nRF7002DK, it only supports 1.8V.

There may be methods for changing it on the DK itself, but I think they will be a bit hacky.

Can I suggest that you use a logic level converter instead for testing the DK with higher voltage peripherals?

[LanceTaiwan]

Hi

    Yes please

[Sigurd Hellesvik]

I mean:

Use a Logic Level Converter module

[LanceTaiwan]

Hi,

    Let me discuss with my hardware engineers, thanks