The Common application error handler module provides the weak function app_error_fault_handler for handling application and SoftDevice errors. If custom handing of errors is needed, app_error_fault_handler can be redefined in the application. Most example applications in the SDK use the default function.
The app_error_fault_handler has the same signature as the nrf_fault_handler_t . The error module defines its own IDs ( Fault ID types ) in addition to the ones defined by the SoftDevice ( Fault ID types ). In some cases (see the ID documentation), the uint32_t info parameter represents a pointer to a struct that has been cast.
The behavior of the default error handler depends on whether the DEBUG flag is set:
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If the DEBUG flag is not set:
When app_error_fault_handler is invoked, the MCU is reset.
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If the DEBUG flag is set:
When app_error_fault_handler is invoked, the error info (for example the function parameters: error code, line number, and file name) are copied to global memory, interrupts are disabled, and the application enters an infinite loop.
If the BSP_DEFINES_ONLY flag is set, all LEDs available on the board are turned on.
If the BSP_DEFINES_ONLY flag is not set, the BSP_INDICATE_FATAL_ERROR state is indicated.