diff --git a/ports/rp2/CMakeLists.txt b/ports/rp2/CMakeLists.txt
index 37ac78b733..6037eafbe8 100644
--- a/ports/rp2/CMakeLists.txt
+++ b/ports/rp2/CMakeLists.txt
@@ -96,6 +96,8 @@ set(MICROPY_SOURCE_LIB
     ${MICROPY_DIR}/shared/runtime/sys_stdio_mphal.c
     ${MICROPY_DIR}/shared/runtime/tinyusb_helpers.c
     ${MICROPY_DIR}/shared/timeutils/timeutils.c
+    ${MICROPY_DIR}/shared/tinyusb/usbd.c
+    ${MICROPY_DIR}/shared/tinyusb/usbd_descriptor.c
 )
 
 set(MICROPY_SOURCE_DRIVERS
@@ -125,8 +127,8 @@ set(MICROPY_SOURCE_PORT
     pendsv.c
     rp2_flash.c
     rp2_pio.c
-    tusb_port.c
     uart.c
+    usbd.c
     msc_disk.c
     mbedtls/mbedtls_port.c
 )
@@ -233,6 +235,11 @@ if(MICROPY_BLUETOOTH_NIMBLE)
     list(APPEND MICROPY_INC_CORE ${NIMBLE_INCLUDE})
 endif()
 
+# tinyusb helper
+target_include_directories(${MICROPY_TARGET} PRIVATE
+    ${MICROPY_DIR}/shared/tinyusb/
+)
+
 if (MICROPY_PY_NETWORK_CYW43)
     string(CONCAT GIT_SUBMODULES "${GIT_SUBMODULES} " lib/cyw43-driver)
     if((NOT (${ECHO_SUBMODULES})) AND NOT EXISTS ${MICROPY_DIR}/lib/cyw43-driver/src/cyw43.h)
diff --git a/ports/rp2/main.c b/ports/rp2/main.c
index 1062236a39..572e9e42c1 100644
--- a/ports/rp2/main.c
+++ b/ports/rp2/main.c
@@ -43,6 +43,7 @@
 #include "modrp2.h"
 #include "mpbthciport.h"
 #include "genhdr/mpversion.h"
+#include "usbd.h"
 
 #include "pico/stdlib.h"
 #include "pico/binary_info.h"
@@ -87,6 +88,7 @@ int main(int argc, char **argv) {
     #if MICROPY_HW_ENABLE_USBDEV
     bi_decl(bi_program_feature("USB REPL"))
     tusb_init();
+    usbd_reset_all(); // run now just in case usb initialization occurs early
     #endif
 
     #if MICROPY_PY_THREAD
@@ -159,6 +161,9 @@ int main(int argc, char **argv) {
         machine_pin_init();
         rp2_pio_init();
         machine_i2s_init0();
+        #if MICROPY_HW_ENABLE_USBDEV
+        usbd_reset_all();
+        #endif
 
         #if MICROPY_PY_BLUETOOTH
         mp_bluetooth_hci_init();
diff --git a/ports/rp2/mpconfigport.h b/ports/rp2/mpconfigport.h
index a3725789f0..2518a275b0 100644
--- a/ports/rp2/mpconfigport.h
+++ b/ports/rp2/mpconfigport.h
@@ -198,6 +198,13 @@ extern const struct _mod_network_nic_type_t mod_network_nic_type_wiznet5k;
 
 // Miscellaneous settings
 
+#ifndef MICROPY_HW_USB_VID
+#define MICROPY_HW_USB_VID (0x2E8A) // Raspberry Pi
+#endif
+#ifndef MICROPY_HW_USB_PID
+#define MICROPY_HW_USB_PID (0x0005) // RP2 MicroPython
+#endif
+
 // Entering a critical section.
 extern uint32_t mp_thread_begin_atomic_section(void);
 extern void mp_thread_end_atomic_section(uint32_t);
diff --git a/ports/rp2/usbd.c b/ports/rp2/usbd.c
new file mode 100644
index 0000000000..38c6dcdd42
--- /dev/null
+++ b/ports/rp2/usbd.c
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2022 Blake W. Felt
+ *
+ * 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.
+ */
+
+#include "usbd.h"
+#include "string.h"
+#include "pico/unique_id.h"
+
+int usbd_serialnumber(uint8_t *buf) {
+    pico_unique_board_id_t id;
+    const int len = 8;
+
+    pico_get_unique_board_id(&id);
+    memcpy(buf, id.id, len);
+
+    return len;
+}
diff --git a/ports/rp2/tusb_config.h b/shared/tinyusb/tusb_config.h
similarity index 89%
rename from ports/rp2/tusb_config.h
rename to shared/tinyusb/tusb_config.h
index ce321616a6..b50c702606 100644
--- a/ports/rp2/tusb_config.h
+++ b/shared/tinyusb/tusb_config.h
@@ -22,9 +22,11 @@
  * THE SOFTWARE.
  *
  */
-#ifndef MICROPY_INCLUDED_RP2_TUSB_CONFIG_H
-#define MICROPY_INCLUDED_RP2_TUSB_CONFIG_H
 
+#ifndef MICROPY_INCLUDED_SHARED_TINYUSB_TUSB_CONFIG_H
+#define MICROPY_INCLUDED_SHARED_TINYUSB_TUSB_CONFIG_H
+
+#include <py/mpconfig.h>
 #include "mpconfigport.h"
 
 #define CFG_TUSB_RHPORT0_MODE   (OPT_MODE_DEVICE)
@@ -41,4 +43,4 @@
 #define CFG_TUD_MSC_BUFSIZE     (MICROPY_FATFS_MAX_SS)
 #endif
 
-#endif // MICROPY_INCLUDED_RP2_TUSB_CONFIG_H
+#endif // MICROPY_INCLUDED_SHARED_TINYUSB_TUSB_CONFIG_H
diff --git a/shared/tinyusb/usbd.c b/shared/tinyusb/usbd.c
new file mode 100644
index 0000000000..01e04b9462
--- /dev/null
+++ b/shared/tinyusb/usbd.c
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2022 Blake W. Felt
+ *
+ * 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.
+ */
+
+#include "py/runtime.h"
+#include "usbd.h"
+
+void usbd_reset_all(void) {
+    usbd_reset_descriptor();
+}
diff --git a/shared/tinyusb/usbd.h b/shared/tinyusb/usbd.h
new file mode 100644
index 0000000000..9c450fb552
--- /dev/null
+++ b/shared/tinyusb/usbd.h
@@ -0,0 +1,41 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2022 Blake W. Felt
+ *
+ * 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.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_TINYUSB_USBD_H
+#define MICROPY_INCLUDED_SHARED_TINYUSB_USBD_H
+
+#include "py/obj.h"
+
+// defined externally (needed per port)
+
+int usbd_serialnumber(uint8_t *buf);
+
+// external use
+
+void usbd_reset_all(void);
+void usbd_reset_descriptor(void);
+
+#endif // MICROPY_INCLUDED_SHARED_TINYUSB_USBD_H
diff --git a/ports/rp2/tusb_port.c b/shared/tinyusb/usbd_descriptor.c
similarity index 85%
rename from ports/rp2/tusb_port.c
rename to shared/tinyusb/usbd_descriptor.c
index 4aac08791e..d3c65aee8a 100644
--- a/ports/rp2/tusb_port.c
+++ b/shared/tinyusb/usbd_descriptor.c
@@ -4,6 +4,7 @@
  * The MIT License (MIT)
  *
  * Copyright (c) 2019 Damien P. George
+ * Copyright (c) 2022 Blake W. Felt
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -24,15 +25,9 @@
  * THE SOFTWARE.
  */
 
+#include "mpconfigport.h"
 #include "tusb.h"
-#include "pico/unique_id.h"
-
-#ifndef MICROPY_HW_USB_VID
-#define MICROPY_HW_USB_VID (0x2E8A) // Raspberry Pi
-#endif
-#ifndef MICROPY_HW_USB_PID
-#define MICROPY_HW_USB_PID (0x0005) // RP2 MicroPython
-#endif
+#include "usbd.h"
 
 #if CFG_TUD_MSC
 #define USBD_DESC_LEN (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN + TUD_MSC_DESC_LEN)
@@ -65,6 +60,9 @@
 #define USBD_STR_CDC (0x04)
 #define USBD_STR_MSC (0x05)
 
+#define USBD_DESC_STR_MAX (20)
+#define USBD_DESC_SERIAL_MAX (32)
+
 // Note: descriptors returned from callbacks must exist long enough for transfer to complete
 
 static const tusb_desc_device_t usbd_desc_device = {
@@ -115,8 +113,7 @@ const uint8_t *tud_descriptor_configuration_cb(uint8_t index) {
 }
 
 const uint16_t *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
-    #define DESC_STR_MAX (20)
-    static uint16_t desc_str[DESC_STR_MAX];
+    static uint16_t desc_str[USBD_DESC_STR_MAX];
 
     uint8_t len;
     if (index == 0) {
@@ -128,17 +125,22 @@ const uint16_t *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
         }
         // check, if serial is requested
         if (index == USBD_STR_SERIAL) {
-            pico_unique_board_id_t id;
-            pico_get_unique_board_id(&id);
+            uint8_t buffer[USBD_DESC_SERIAL_MAX] = {0};
+            int buflen;
+            const char *hexdig = "0123456789abcdef";
+
+            buflen = usbd_serialnumber(buffer);
             // byte by byte conversion
-            for (len = 0; len < 16; len += 2) {
-                const char *hexdig = "0123456789abcdef";
-                desc_str[1 + len] = hexdig[id.id[len >> 1] >> 4];
-                desc_str[1 + len + 1] = hexdig[id.id[len >> 1] & 0x0f];
+            len = 0;
+            for (int i=0; i<buflen; i++) {
+                uint8_t val = buffer[i];
+                desc_str[1 + len] = hexdig[val >> 4];
+                desc_str[2 + len] = hexdig[val & 0x0F];
+                len += 2;
             }
         } else {
             const char *str = usbd_desc_str[index];
-            for (len = 0; len < DESC_STR_MAX - 1 && str[len]; ++len) {
+            for (len = 0; len < USBD_DESC_STR_MAX - 1 && str[len]; ++len) {
                 desc_str[1 + len] = str[len];
             }
         }
@@ -149,3 +151,7 @@ const uint16_t *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
 
     return desc_str;
 }
+
+void usbd_reset_descriptor(void) {
+    // not used yet
+}