RTC Initialization fails (NRF_ERROR_ALREADY)

[Ros]

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]

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

[Ros]

Håkon Alseth said:

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

Fullscreen

I thought I’d already removed the first line. Thanks, it worked!