1  # Custom utilities for openOCD
 2  
 3  # NOTE: This file must be included prior to any other file that
 4  # might reference it
 5  
 6  puts "Loading custom utils!"
 7  
 8  # Detach debugger so processor can go about it's business
 9  # Otherwise if we have any halt_if_debugging() dependent code
10  # it will keep hitting it until a power-on reset clears the
11  # "debugging" flag. This is set whenever a debugger is attached
12  # for debugging and/or flashing purposes
13  proc detach_swd {} {
14      # Clear C_DEBUGEN in DHCSR register
15      # Also need to write magic 0xA05F "DBGKEY"
16      # See link for more information:
17      # https://developer.arm.com/documentation/ddi0403/d/Debug-Architecture/ARMv7-M-Debug/Debug-register-support-in-the-SCS/Debug-Halting-Control-and-Status-Register--DHCSR
18      mmw 0xE000EDF0 0xA05F0000 0xFFFF0001
19  }
20  
21  # Make sure system keeps running when we detatch gdb
22  $_TARGETNAME configure -event gdb-detach {
23      resume
24      detach_swd
25      shutdown
26  }