diff --git a/hw/bsp/ra/family.cmake b/hw/bsp/ra/family.cmake
index 307e01da8..11bc7c668 100644
--- a/hw/bsp/ra/family.cmake
+++ b/hw/bsp/ra/family.cmake
@@ -116,6 +116,7 @@ function(family_configure_example TARGET RTOS)
   target_sources(${TARGET}-tinyusb PUBLIC
     ${TOP}/src/portable/renesas/rusb2/dcd_rusb2.c
     ${TOP}/src/portable/renesas/rusb2/hcd_rusb2.c
+    ${TOP}/src/portable/renesas/rusb2/rusb2_common.c
     )
   target_link_libraries(${TARGET}-tinyusb PUBLIC board_${BOARD})
 
diff --git a/hw/bsp/ra/family.mk b/hw/bsp/ra/family.mk
index 901808958..9afb38e06 100644
--- a/hw/bsp/ra/family.mk
+++ b/hw/bsp/ra/family.mk
@@ -34,6 +34,7 @@ endif
 SRC_C += \
 	src/portable/renesas/rusb2/dcd_rusb2.c \
 	src/portable/renesas/rusb2/hcd_rusb2.c \
+	src/portable/renesas/rusb2/rusb2_common.c \
 	$(FSP_RA)/src/bsp/cmsis/Device/RENESAS/Source/startup.c \
 	$(FSP_RA)/src/bsp/cmsis/Device/RENESAS/Source/system.c \
 	$(FSP_RA)/src/bsp/mcu/all/bsp_clocks.c \
diff --git a/src/portable/renesas/rusb2/dcd_rusb2.c b/src/portable/renesas/rusb2/dcd_rusb2.c
index 9a3983f56..3ec1b70b5 100644
--- a/src/portable/renesas/rusb2/dcd_rusb2.c
+++ b/src/portable/renesas/rusb2/dcd_rusb2.c
@@ -50,11 +50,6 @@
     #define D0FIFOCTR_b CFIFOCTR_b
   #endif
 
-  // Application API for setting IRQ number
-  void tud_rusb2_set_irqnum(uint8_t rhport, int32_t irqnum) {
-    rusb2_controller[rhport].irqnum = irqnum;
-  }
-
 #else
   #error "Unsupported MCU"
 #endif
diff --git a/src/portable/renesas/rusb2/hcd_rusb2.c b/src/portable/renesas/rusb2/hcd_rusb2.c
index 7f49dc8a9..621320095 100644
--- a/src/portable/renesas/rusb2/hcd_rusb2.c
+++ b/src/portable/renesas/rusb2/hcd_rusb2.c
@@ -34,14 +34,8 @@
 
 #if TU_CHECK_MCU(OPT_MCU_RX63X, OPT_MCU_RX65X, OPT_MCU_RX72N)
   #include "rusb2_rx.h"
-
 #elif TU_CHECK_MCU(OPT_MCU_RAXXX)
   #include "rusb2_ra.h"
-
-//  void osal_task_delay(uint32_t msec) {
-//    R_BSP_SoftwareDelay(msec, BSP_DELAY_UNITS_MILLISECONDS);
-//  }
-
 #else
   #error "Unsupported MCU"
 #endif
diff --git a/src/portable/renesas/rusb2/rusb2_common.c b/src/portable/renesas/rusb2/rusb2_common.c
new file mode 100644
index 000000000..850060777
--- /dev/null
+++ b/src/portable/renesas/rusb2/rusb2_common.c
@@ -0,0 +1,61 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2023 Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#include "tusb_option.h"
+
+#if defined(TUP_USBIP_RUSB2) && (CFG_TUH_ENABLED || CFG_TUD_ENABLED)
+
+#include "rusb2_type.h"
+
+#if TU_CHECK_MCU(OPT_MCU_RX63X, OPT_MCU_RX65X, OPT_MCU_RX72N)
+#include "rusb2_rx.h"
+
+#elif TU_CHECK_MCU(OPT_MCU_RAXXX)
+#include "rusb2_ra.h"
+
+// USBFS_INT_IRQn and USBHS_USB_INT_RESUME_IRQn are generated by FSP
+rusb2_controller_t rusb2_controller[] = {
+    { .reg_base = R_USB_FS0_BASE, .irqnum = USBFS_INT_IRQn },
+    #ifdef RUSB2_SUPPORT_HIGHSPEED
+    { .reg_base = R_USB_HS0_BASE, .irqnum = USBHS_USB_INT_RESUME_IRQn },
+    #endif
+};
+
+// Application API for setting IRQ number. May throw warnings for missing prototypes.
+void tusb_rusb2_set_irqnum(uint8_t rhport, int32_t irqnum) {
+  rusb2_controller[rhport].irqnum = irqnum;
+}
+
+//  void osal_task_delay(uint32_t msec) {
+//    R_BSP_SoftwareDelay(msec, BSP_DELAY_UNITS_MILLISECONDS);
+//  }
+
+#else
+  #error "Unsupported MCU"
+#endif
+
+
+#endif
diff --git a/src/portable/renesas/rusb2/rusb2_ra.h b/src/portable/renesas/rusb2/rusb2_ra.h
index 7ff272bbc..259d3cbdb 100644
--- a/src/portable/renesas/rusb2/rusb2_ra.h
+++ b/src/portable/renesas/rusb2/rusb2_ra.h
@@ -74,13 +74,7 @@ typedef struct {
   #define rusb2_is_highspeed_reg(_reg)   (false)
 #endif
 
-// USBFS_INT_IRQn and USBHS_USB_INT_RESUME_IRQn are generated by FSP
-static rusb2_controller_t rusb2_controller[] = {
-    { .reg_base = R_USB_FS0_BASE, .irqnum = USBFS_INT_IRQn },
-    #ifdef RUSB2_SUPPORT_HIGHSPEED
-    { .reg_base = R_USB_HS0_BASE, .irqnum = USBHS_USB_INT_RESUME_IRQn },
-    #endif
-};
+extern rusb2_controller_t rusb2_controller[];
 
 #define RUSB2_REG(_p)      ((rusb2_reg_t*) rusb2_controller[_p].reg_base)
 
diff --git a/src/portable/renesas/rusb2/rusb2_type.h b/src/portable/renesas/rusb2/rusb2_type.h
index 005d7f2be..dd88f66a7 100644
--- a/src/portable/renesas/rusb2/rusb2_type.h
+++ b/src/portable/renesas/rusb2/rusb2_type.h
@@ -28,6 +28,7 @@
 #define _TUSB_RUSB2_TYPE_H_
 
 #include <stdint.h>
+#include <stddef.h>
 
 #ifdef __cplusplus
 extern "C" {