esp_backtrace_get_start() function

Get the first frame of the current stack's backtrace Given the following function call flow (B -> A -> X -> esp_backtrace_get_start), this function will do the following. - Flush CPU registers and window frames onto the current stack - Return PC and SP of function A (i.e. start of the stack's backtrace) - Return PC of function B (i.e. next_pc)