LFCLK request gives Fatal error

[Ali Rumane]

Hi,

I modified template example and now I am trying to add usb cdc. The applicaton results in Fatal error.I found that nrf_drv_clock_init() works fine but nrf_drv_clock_lfclk_request(NULL); gives Fatal error.

ret_code_t err_code = nrf_drv_clock_init();
APP_ERROR_CHECK(err_code);
nrf_drv_clock_lfclk_request(NULL);

while(!nrf_drv_clock_lfclk_is_running())
{
    /* Just waiting */
}

I have included

#include "nrf_drv_clock.h"
#include "nrf_drv_power.h"

 in header , enabled

#ifndef NRFX_CLOCK_ENABLED
#define NRFX_CLOCK_ENABLED 1
#endif

// <0=> RC 
// <1=> XTAL 
// <2=> Synth 
// <131073=> External Low Swing 
// <196609=> External Full Swing 

#ifndef NRFX_CLOCK_CONFIG_LF_SRC
#define NRFX_CLOCK_CONFIG_LF_SRC 1
#endif

#ifndef NRFX_POWER_ENABLED
#define NRFX_POWER_ENABLED 1
#endif

#ifndef NRF_CLOCK_ENABLED
#define NRF_CLOCK_ENABLED 1
#endif
// <o> CLOCK_CONFIG_LF_SRC  - LF Clock Source
 
// <0=> RC 
// <1=> XTAL 
// <2=> Synth 
// <131073=> External Low Swing 
// <196609=> External Full Swing 

#ifndef CLOCK_CONFIG_LF_SRC
#define CLOCK_CONFIG_LF_SRC 1
#endif

#ifndef POWER_ENABLED
#define POWER_ENABLED 1
#endif

among other parameters as in usb cdc example but still gets error (I compared sdk_config.h and project includes with usb_cdc_acm example).

Could you please let me know why is it happening?

nRF52840 - Raytac Corporation MDBT50Q Module. (has 32.768 kHz crystal) image attached.

SDK 15.2

Edit: Can you please make it a public case?

[Jørgen Holmefjord]

Hi,

Are you using a softdevice in your application? If you do, have you set the SOFTDEVICE_PRESENT flag in your preprocessor symbols?

Best regards,
Jørgen

[Jørgen Holmefjord]

Are you sure that the "Fatal error" is coming from nrf_drv_clock_lfclk_request? I would recommend that you enable the DEBUG flag to get more details about the error in the log output. See this post and this video tutorial for more information about debugging.

[Ali Rumane]

Hi,

Thank you for your reply.

I found that the error was from 

void uart_event_handle(app_uart_evt_t * p_event)

    APP_ERROR_HANDLER(p_event->data.error_communication)

It is common error found on devzone. Is there something we can do to prevent it?

Regards