Why does hard fault occurs in the example ble_app_blinky_pca10056_s140 ?

[tj.park]

I'm experimenting with nRF52840 DK 

However, using break points in the main loop causes 'app_error_fault_handler'.

using the iar compiler. What's the cause?

[Simonr]

Hi

If you're setting breakpoints while the application is doing something time critical, likely causing the SoftDevice to miss its BLE timing. The workaround would be to instead do a reset instead of continue when debugging.

Best regards,

Simon