RTC Initialization fails (NRF_ERROR_ALREADY)

Question

Hi, 
 I'm trying to use an RTC with the nRF Connect SDK (v2.9.0) and nRF52840, but nrfx_rtc_init always returns the error NRF_ALREADY_INIT . I haven't used the RTC anywhere else in my code, and I also tried using RTC0, but I still get the same error." 
 const nrfx_rtc_t rtc = NRFX_RTC_INSTANCE(2);
 
 nrfx_err_t err;
 nrfx_rtc_config_t rtc_cfg = NRFX_RTC_DEFAULT_CONFIG;
 if (nrfx_rtc_init(&rtc, &rtc_cfg, rtc_event_handler))
 err = nrfx_rtc_init(&rtc, &rtc_cfg, rtc_event_handler); 
 The project configuration file is below: CONFIG_NRFX_SAADC=y
CONFIG_NRFX_PPI=y
CONFIG_NRFX_TIMER4=y
CONFIG_NRFX_TEMP=y
CONFIG_NRFX_PWM0=y
CONFIG_NRFX_RTC2=y
# Enable DK LED and Buttons library
CONFIG_DK_LIBRARY=y
CONFIG_LOG=y
CONFIG_LOG_MODE_MINIMAL=y 
 I'm using the nrfx library because I need to link it with the PPI module, which I believe is not supported in Zephyr.

Håkon Alseth · Accepted Answer

Hi,

I ran this in hello_world:

/*
 * Copyright (c) 2012-2014 Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <stdio.h>
#include <nrfx_rtc.h>

static const nrfx_rtc_t rtc = NRFX_RTC_INSTANCE(2);

void rtc_event_handler(nrfx_rtc_int_type_t isr_type)
{
	(void)isr_type;
}

int main(void)
{
	printf("Hello World! %s\n", CONFIG_BOARD_TARGET);
  
    nrfx_err_t err;
    nrfx_rtc_config_t rtc_cfg = NRFX_RTC_DEFAULT_CONFIG;
    err = nrfx_rtc_init(&rtc, &rtc_cfg, rtc_event_handler);
	printf("Error : %x\n", err);
	return 0;
}

And it prints NRFX_SUCCESS (0xbad0000).

This will always run nrfx_rtc_init twice, as "NRFX_SUCCESS" is not defined as 0:

    if (nrfx_rtc_init(&rtc, &rtc_cfg, rtc_event_handler))
    err = nrfx_rtc_init(&rtc, &rtc_cfg, rtc_event_handler);

Kind regards,

Håkon

RTC Initialization fails (NRF_ERROR_ALREADY)

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