nRF52810 P0.14 out of control

[Ryon_pan]

hi,

I found a  interesting thing：I use the output function to configure the P0.14（nrf_gpio_cfg_output(14)）. After configuration, the normal output should be low, but it outputs high. Can you explain.

another question：Some pins are high by default（for example P0.16）. When I don’t use these pins, will they increase power consumption? Do they need to be configured as inputs or outputs to reduce power consumption?

thanks a lot

[ovrebekk]

Hi 

The pins should default to low when configured as outputs.

Can you check the state of the NRF_GPIO->OUT register after reset and see what it is configured to?

What kind of hardware board or module are you using?

Best regards
Torbjørn

[Ryon_pan]

yes,the pins should default to low when configured as outputs,but pin 14(nRF52810) is high when configured as output,you can try.That's why I want to ask you.

My hardware is as follows：LED5 is pin 14.

Is the SDK set to high by default

[ovrebekk]

Hi

I just tried it with an nRF52811 device, which is very similar to the nRF52810, and see no problems. I configure P0.14 as an output at the start of the application, and verify with a multimeter that the pin is low. 

I ran the following simple code to test this:

int main(void)
{
    nrf_gpio_cfg_output(14);
    nrf_gpio_cfg_output(17);
    nrf_gpio_cfg_output(18);

    while (true)
    {
        nrf_delay_ms(500);
        nrf_gpio_pin_toggle(18);
    }
}

If you test the same code, will the issue remain?

To clarify, you're testing this on your own hardware?

Do you have more than one board to test with?

Best regards
Torbjørn

[Ryon_pan]

very sorry,I pulled up these pins in the bootloader.

[ovrebekk]

Good to hear you found the issue  

That explains why the pin got set before the application could run ;)