Arduino Leonardo with USB Shield does not work at bootup

[MycroftHolmes1989]

I am using an Arduino Leonardo with an USB Shield as a QMK USB-to-USB converter, and for all intents and purposes, it works flawlessly. It even works fine with the wireless Logitech keyboards. But, when I boot up the system, with the Leonardo plugged in, the system fails to recognise the keyboard. Only when I remove the board, then connect the Leonardo to the computer, and then the keyboard to the Leonardo, exactly in that order, does it start to work.

System Information

• Keyboard: Logitech K375s
• Operating system: Ubuntu 18.10 / Fedora 29 / Arch Linux / OpenSUSE Tumbleweed
• AVR GCC version: 5.4.0
• ARM GCC version: 15:6.3.1+svn253039-1build1
• QMK Firmware version: 0.6.326

[MycroftHolmes1989]

This is my rules.mk

# MCU name
MCU = atmega32u4

# Processor frequency.
#     This will define a symbol, F_CPU, in all source code files equal to the
#     processor frequency in Hz. You can then use this symbol in your source code to
#     calculate timings. Do NOT tack on a 'UL' at the end, this will be done
#     automatically to create a 32-bit value in your source code.
#
#     This will be an integer division of F_USB below, as it is sourced by
#     F_USB after it has run through any CPU prescalers. Note that this value
#     does not *change* the processor frequency - it should merely be updated to
#     reflect the processor speed set externally so that the code can use accurate
#     software delays.

# Since there are different hardware variations of these adapters and since these
# have different CPU clocks, the clock speed should be set in the rules.mk file of the
# respective hardware variantion (i.e. subproject). For example, in /pro_micro/rules.mk
# this is set to 8000000.
# The value here is only a fallback and is ignored if it is defined in the subproject.
F_CPU ?= 16000000

DEFAULT_FOLDER = converter/usb_usb/hasu

#
# LUFA specific
#
# Target architecture (see library "Board Types" documentation).
ARCH = AVR8

# Input clock frequency.
#     This will define a symbol, F_USB, in all source code files equal to the
#     input clock frequency (before any prescaling is performed) in Hz. This value may
#     differ from F_CPU if prescaling is used on the latter, and is required as the
#     raw input clock is fed directly to the PLL sections of the AVR for high speed
#     clock generation for the USB and other AVR subsections. Do NOT tack on a 'UL'
#     at the end, this will be done automatically to create a 32-bit value in your
#     source code.
#
#     If no clock division is performed on the input clock inside the AVR (via the
#     CPU clock adjust registers or the clock division fuses), this will be equal to F_CPU.
F_USB = $(F_CPU)

# Bootloader
#     This definition is optional, and if your keyboard supports multiple bootloaders of
#     different sizes, comment this out, and the correct address will be loaded
#     automatically (+60). See bootloader.mk for all options.
BOOTLOADER = caterina

# Interrupt driven control endpoint task
OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
EXTRAFLAGS += -flto
# Build Options
#   comment out to disable the options.
#
#BOOTMAGIC_ENABLE = yes  # Virtual DIP switch configuration(+1000)
MOUSEKEY_ENABLE  = yes  # Mouse keys(+4700)
EXTRAKEY_ENABLE  = yes  # Audio control and System control(+450)
#CONSOLE_ENABLE   = yes  # Console for debug(+400)
#COMMAND_ENABLE   = yes  # Commands for debug and configuration
#SLEEP_LED_ENABLE = yes  # Breathing sleep LED during USB suspend
#NKRO_ENABLE      = yes  # USB Nkey Rollover - not yet supported in LUFA
#BACKLIGHT_ENABLE = yes
USB_HID_ENABLE   = yes
CUSTOM_MATRIX    = yes

SRC = custom_matrix.cpp

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had activity in the last 90 days. It will be closed in the next 30 days unless it is tagged properly or other activity occurs. For maintainers: Please label with bug, in progress, on hold, discussion or to do to prevent the issue from being re-flagged.

[tzarc]

Closing due to inactivity.