sd_evt_get hang by HardFault_Handler

Question

Hello 
 I am using the nrf51822_Beacon application and SDKv7.1.0.
have a issue when sd_evt_get function start executing, after imitatively program counter reach into HardFault_handler, it can not come outside the sd_evt_get().

Hung Bui · Accepted Answer

Hi Rk Menat, 
 When you add a break point and halt the CPU, other peripheral that the stack uses(timer, RTC, PPI, radio) still work and when you call a softdevice API, most likely you will receive a hardfault because the stack already crash. 
 For debugging you can use UART or Segger RTT to printout the trace.