PCA10005 GPIO: unable to drive a high voltage level.

[NK]

Hi,

I have the following code running on NRF51822:

int main(void)
{
    // Configure GPIO 08 (P1.0) as output.

  nrf_gpio_cfg_output(8);
   // Set HI on GPIO 08(P1.0)
   nrf_gpio_pin_set(8);

...
}

However, when I check the voltage at pin 29 of connector P1 on the PCA10005 board (which I believe corresponds to GPIO 08) using a multimeter, I find that it reads 0V. What should I be expecting & is there any additional configuration required in order to drive a HI (3.3V) on GPIO pins.

Regards, NK

[John]

Hi,

If you look at the GPIO section of the nRF51822 reference manual, it would appear that GPIO pins are set to low by default. You need to do a nrf_gpio_pin_set(8); in order to get the high value on the pin.

[NK]

Hi John,

Apologies if it was not clear - I think some of the formatting in my original post got removed, but I do have that statement in my code above. I would appreciate any pointers on how I could debug the fact that inspite of having the "nrf_gpio_pin_set" statement in my code, I am still not seeing a HIGH voltage level on the GPIO pin.

Thanks, NK