Change Pin from Input to Output in runtime?

[schef]

Hi, i have nrf52 and sdk13.1. Is this possible. I get NRF_ERROR_INVALID_STATE.

[Boris Matešin]

I have a similar case, so pardon me for hijacking the topic. I have pin 0.08 that I wanted to have as a dual-purpose pin - first a pushbutton, then a LED. Both are tied to the pin, in parallel, then grounded

My init goes smoothly:

#define GPIO_1 8

err_code = nrf_drv_gpiote_init();
APP_ERROR_CHECK(err_code);

nrf_drv_gpiote_in_config_t configInButton = GPIOTE_CONFIG_IN_SENSE_HITOLO(true);
err_code = nrf_drv_gpiote_in_init(BUTTON_0, &configInButton, my_gpio_handler);
APP_ERROR_CHECK(err_code);

and my_gpio_handler works well. Once I'm done with the button I call a second method that does the following:

nrf_drv_gpiote_out_config_t configOut = GPIOTE_CONFIG_OUT_SIMPLE(0);
err_code = nrf_drv_gpiote_out_init(GPIO_1, &configOut);
APP_ERROR_CHECK(err_code);

That last APP_ERROR_CHECK throws an NRF_ERROR_INVALID_STATE.

Did I skip a step somewhere?