Adafruit Feather Express nRF52840 PlatformIO configuration for Black Magic Probe debugger

platformio.ini

; PlatformIO Project Configuration File
;
;   Build options: build flags, source filter
;   Upload options: custom upload port, speed and extra flags
;   Library options: dependencies, extra library storages
;   Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html

[env:nrf52840_dk]
platform = nordicnrf52
board = nrf52840_dk
framework = zephyr

debug_tool = blackmagic
debug_port = /dev/cu.usbmodem79A67BCB1
debug_init_cmds =
    define pio_reset_halt_target
        set language c
        set *0xE000ED0C = 0x05FA0004
        set $busy = (*0xE000ED0C & 0x4)
        while ($busy)
            set $busy = (*0xE000ED0C & 0x4)
        end
        set language auto
    end
    define pio_reset_run_target
        pio_reset_halt_target
    end
    target extended-remote $DEBUG_PORT
    monitor tpwr enable
    monitor swdp_scan
    attach 1
    set mem inaccessible-by-default off
    $LOAD_CMDS
    $INIT_BREAK
    set language c
    set *0xE000ED0C = 0x05FA0004
    set $busy = (*0xE000ED0C & 0x4)
    while ($busy)
        set $busy = (*0xE000ED0C & 0x4)
    end
    set language auto

upload_protocol = blackmagic
upload_port = /dev/cu.usbmodem79A67BCB1