P0.17 on nRF52840

[higherkuo]

Hi,

I designed a customer board and defined my own board header file, which is pretty much copied from pca10056.h. One question I encountered is I somehow couldn't toggle p0.17. 

int main(void)
{
    /* Configure board. */
    nrf_gpio_cfg_output(17);

    /* Toggle LEDs. */
    while (true)
    {
            nrf_gpio_pin_toggle(17);
            nrf_delay_ms(2000);
    }
}

I tried something like this, but it doesn't toggle. It always stays low. I'm sure this is some software config I need to change, but couldn't find it. Can someone point me the right direction?

Thanks,

[haakonsh]

I suggest you enter debug mode and verify that the PORT0's PIN_CNF[17] registers is set correctly after you've called nrf_gpio_cfg_output(17), and that PORT0's OUT register shows a toggling pin. Do note that you will need to halt the cpu in order to read the registers, so set a breakpoint after the configuration and after each toggling of the pin. 
 
If you can verify that the registers behave as we expect then we're most likely looking at a soldering or ESD issue. A scope of the pin when it's toggling can be useful. 

[awneil]

higherkuo said:

I tried something (sic) like this

It would be better if you showed exactly what you tried!

Also, if you run the same code on a known-good board - does it work?

[haakonsh]

Also this :) 

[higherkuo]

Turns out this is a measuring error, everything is good :)