Including the rp2350 stack on my OS

[Edo-Franzi]

Dear all,
I would like to port the TinyUSB stack for the RP2350 to my OS.
As I already did with other CPUs, I have created a static library (.a) that contains all the required
TinyUSB .c files, as well as the necessary pico-sdk .c and .S files.
The runtime and the vector table handling are not included in the library and are provided by the OS.
As soon as tud_init(BOARD_TUD_RHPORT) is called, the CPU ends up in a BusFault exception.
Has anyone already done this kind of integration or experienced a similar issue?
Any hints or suggestions on how to fix or debug this would be very welcome.
Kind regards,
Edo

Here is the list of the modules I compile and I include in my archive.a

ifeq ($(PROVIDER), raspberry)
PATH_INCLUDES += -I$(PATH_OS)/Ports/EquatesModels/Generic/Runtime
PATH_INCLUDES += -I$(PATH_OS)/Ports/EquatesModels/SOCs/$(SOC)/Includes
PATH_INCLUDES += -I$(PATH_OS)/Ports/EquatesModels/Cores/$(CORE)/Includes
PATH_INCLUDES += -I$(PATH_TINYUSB)/OS_Interface/Includes/mcu/$(PROVIDER)

PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/common/pico_base_headers/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/pico_platform/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/hardware_base/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/hardware_irq/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/hardware_resets/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/hardware_sync/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/hardware_sync_spin_lock/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/hardware_timer/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/hardware_claim/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/hardware_structs/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/pico_platform_compiler/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/pico_platform_sections/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/pico_platform_panic/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/pico_platform_common/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2350/pico_platform/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2350/hardware_structs/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2350/hardware_regs/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/bazel/include

PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/pico_runtime_init/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/pico_runtime/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/common/hardware_claim/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/common/pico_sync/include
PATH_INCLUDES += -I$(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/common/pico_time/include
endif

SRC = $(PATH_TINYUSB)/OS_System/headerTusb.c
SRC += $(PATH_TINYUSB)/OS_Interface/Descriptors/$(PROFILE)/usb_descriptors.c
SRC += $(PATH_TINYUSB)/OS_Interface/OSAL/tusb_os_custom.c
SRC += $(PATH_TINYUSB)/TinyUSB-current/src/tusb.c
SRC += $(shell find $(PATH_TINYUSB)/TinyUSB-current/src/class -name '.c')
SRC += $(shell find $(PATH_TINYUSB)/TinyUSB-current/src/common -name '.c')
SRC += $(shell find $(PATH_TINYUSB)/TinyUSB-current/src/device -name '.c')
SRC += $(shell find $(PATH_TINYUSB)/TinyUSB-current/src/host -name '.c')
SRC += $(shell find $(PATH_TINYUSB)/TinyUSB-current/src/osal -name '.c')
SRC += $(shell find $(PATH_TINYUSB)/TinyUSB-current/src/typec -name '.c')

ifeq ($(PROVIDER), raspberry)
SRC += $(shell find $(PATH_TINYUSB)/TinyUSB-current/src/portable/raspberrypi -name '*.c')
SRC += $(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/common/hardware_claim/claim.c
SRC_A += $(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/hardware_irq/irq_handler_chain.S
SRC += $(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/hardware_irq/irq.c
SRC += $(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/pico_platform_panic/panic.c
SRC += $(PATH_TINYUSB)/TinyUSB-current/lib/pico-sdk/src/rp2_common/hardware_sync_spin_lock/sync_spin_lock.c
SRC += $(PATH_TINYUSB)/Library/Family/$(FAMILY)/$(SOC)/init.c
endif

On the OS side, as nornal, I initialise the necessary periphs and call the tusb_xyz functions

void stub_TinyUSB_init(void) {

INTERRUPT_VECTOR(USBCTRL_IRQ_C0_IRQn, local_USB_FS_IRQHandler);
NVIC_SetPriority(USBCTRL_IRQ_C0_IRQn, KINT_LEVEL_COMMUNICATIONS);

tud_init(BOARD_TUD_RHPORT);
NVIC_SetPriority(USBCTRL_IRQ_C0_IRQn, KINT_LEVEL_COMMUNICATIONS);

}

void stub_TinyUSB_cyclic(void) {

// Periodically called

tud_task();

}

static void local_USB_FS_IRQHandler(void) {

tud_int_handler(BOARD_TUD_RHPORT);

}