softdevice_fault_handler error

[Gaétan]

Hi,

I have developed a application on nRF51822 that is detect eBeacon and read some information in Beacon and Scan reponse frames.

There is about 200 systems deployed.

I have 4 boards, that is reset periodicly after ~7 seconds ! Only 4 boards at this time, are this problem...

Whean I use debug: 

softdevice_fault_handler() is called ... and the error handler call NVIC_SystemReset();

The  softdevice_fault_handler() function is called with id=1, pc=0xf764, info=0...

I don't use timeslot.

What is the problem ? ... ?

Regards,

Gaétan

EDIT: In my projet I have configured scan_window = scan_interval = BLE_GAP_SCAN_WINDOW_MAX = 0x4000

Now I have changed this value to 2500 and now there no reset !

What is the max value for scan_interval and scan_windows ?

I have indentified that, if there are a lot of ebeacon or smartphone near  the nrf51822, the Reset appear more frequently !

There is a maximum of bluetooth detection in a scan_windows ?

Softdevice S130 V2.001

Regards,

[Kenneth]

Hi,

Is it possible that you are disabling (blocking) interrupts somewhere in your code and/or have any interrupts with priority 0 and/or use timeslot api?

It may also be related to accuracy of the LFCLK is out of specified tolerance.  It's important that the correct XTAL accuracy/ppm value for the crystal is set when enabling the SoftDevice.

Best regards,
Kenneth

[Gaétan]

No interrupt with priority = 0
I think they no blocking or disabling interrupt
No  timeslot used

The mounted XTAL is: https://www.digikey.fr/product-detail/fr/abracon-llc/ABS06-32.768KHZ-T/535-10104-1-ND/2089921 (20ppm)
I have tried to change clock_lf_cfg.xtal_accuracy to NRF_CLOCK_LF_XTAL_ACCURACY_250_PPM, and it's the same...

Regards,
Gaétan

[Gaétan]

I have tried scan window = 0x3FFF and scan interval = 0x4000, 

No change, reset occur every ~10 seconds

[Kenneth]

Are you able to replicate this on a devkit and can send us a precompiled hex file we may try here?

I may check with the developers in any case.

Best regards,
Kenneth

[Gaétan]

I don't have nRF51822 DK...

LED on pin 17, 18, 19

Buzz on start pin 23

Balise-BL+Settings+App+SD 0x4000 0x4000.zip

Regards

[Kenneth]

Can you double check the settings of: NRF_CLOCK_LFCLKSRC, e.g:

{.source = NRF_CLOCK_LF_SRC_XTAL, \
.rc_ctiv = 0, \
.rc_temp_ctiv = 0, \
.xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM}

Just want to make sure it is NRF_CLOCK_LF_SRC_XTAL.

Are you doing any flash write or erase operations?

[Gaétan]

That's right

#define NRF_CLOCK_LFCLKSRC {.source = NRF_CLOCK_LF_SRC_XTAL, \
.rc_ctiv = 0, \
.rc_temp_ctiv = 0, \
.xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM}

nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;
//clock_lf_cfg.xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_250_PPM;

// Initialize the SoftDevice handler module.
SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);

No Write or erase operation in flash.

[Kenneth]

Hi,

I have tried to look for any known issues, but this is the first report we have seen of this. I am not sure if I have any good suggestions other than to for instance use the workaround you are already implying, such as reduce scan window and interval. For instance using 0x2500 for both, this is the same for all practical purposes.

Best regards,
Kenneth

[_maibi]

Hi, Did you solve the problem? I face with the same issue "softdevice_fault_handler() function is called with id=1, pc=0xf764, info=0..." . my case is slightly different, not centeral but peripheral role.

this error randomly occur.

How can I fix this issue?

[Kenneth]

_maibi said:

I face with the same issue "softdevice_fault_handler() function is called with id=1, pc=0xf764, info=0..." . my case is slightly different, not centeral but peripheral role.

 Have you tried my initial comment in your case:

"Is it possible that you are disabling (blocking) interrupts somewhere in your code and/or have any interrupts with priority 0 and/or use timeslot api?

It may also be related to accuracy of the LFCLK is out of specified tolerance.  It's important that the correct XTAL accuracy/ppm value for the crystal is set when enabling the SoftDevice."

[_maibi]

no timeslot api, no interrupt priority 0.

LFCLK X-TAL: FC-135 ±20PPM,9.0PF. 

my ble_stack_init is exactly same above.

define NRF_CLOCK_LFCLKSRC {.source = NRF_CLOCK_LF_SRC_XTAL, \
.rc_ctiv = 0, \
.rc_temp_ctiv = 0, \
.xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM}

nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;

[Kenneth]

Can you try to set 250PPM for test? Any interrupts disable in your code?

Best regards,
Kenneth