diff --git a/examples/Brain/usbh_hub_test/.pico_rp2040_tinyusb.test.only b/examples/Brain/usbh_hub_test/.pico_rp2040_tinyusb.test.only
new file mode 100644
index 0000000..e69de29
diff --git a/examples/Brain/usbh_hub_test/usbh_hub_test.ino b/examples/Brain/usbh_hub_test/usbh_hub_test.ino
new file mode 100644
index 0000000..8227df3
--- /dev/null
+++ b/examples/Brain/usbh_hub_test/usbh_hub_test.ino
@@ -0,0 +1,115 @@
+// Testing USB host hardware on Brain by printing out VID/PID of attached device
+// to LCD. Also determine if device support MSC or HID
+
+// required for Host MSC block device
+#include "SdFat.h"
+
+// required for USB host
+#include "pio_usb.h"
+#include "Adafruit_TinyUSB.h"
+
+#include "Adafruit_TestBed_Brains.h"
+
+typedef struct {
+  uint16_t vid;
+  uint16_t pid;
+  bool mounted;
+} dev_info_t;
+
+// CFG_TUH_DEVICE_MAX is defined by tusb_config header
+dev_info_t dev_info[CFG_TUH_DEVICE_MAX] = { 0 };
+
+
+//--------------------------------------------------------------------+
+// Setup and Loop on Core0
+//--------------------------------------------------------------------+
+
+void setup() {
+}
+
+void loop() {
+  // Scan and print VID/PID
+  uint8_t dev_count = 0;
+  for(uint8_t daddr=1; daddr < CFG_TUH_DEVICE_MAX+1; daddr++) {
+    dev_info_t const* dev = &dev_info[daddr-1];
+
+    if ( dev->mounted ) {
+      dev_count++;
+      Brain.LCD_printf("[%u] %04X:%04X", daddr, dev->vid, dev->pid);
+    }
+
+    delay(1000);
+  }
+
+  if ( dev_count == 0 ) {
+    Brain.LCD_printf(0, "No USB attached");
+    Brain.LCD_printf(1, "Plug your device");
+  }else {
+    Brain.LCD_printf("Devices num: %u", dev_count);
+    delay(1000);
+  }
+}
+
+//--------------------------------------------------------------------+
+// Setup and Loop on Core1
+//--------------------------------------------------------------------+
+
+// call usbh_begin() hrere to make pio usb background task run on core1
+// NOTE: Brain.begin() should be called here as well to prevent race condition
+void setup1() {
+  Serial.begin(115200);
+  // while (!Serial) delay(10);
+
+  Serial.println("Tester Brains USB Host test!");
+
+  // Init Brain peripherals
+  Brain.begin();
+
+  // Init Brain USB Host
+  Brain.usbh_begin();
+
+  Brain.LCD_printf(0, "No USB attached");
+  Brain.LCD_printf(1, "Plug your device");
+}
+
+// core1's loop: process usb host task on core1
+void loop1()
+{
+  Brain.USBHost.task();
+}
+
+//--------------------------------------------------------------------+
+// TinyUSB Host callbacks
+//--------------------------------------------------------------------+
+extern "C"  {
+
+// Invoked when device is mounted (configured)
+void tuh_mount_cb (uint8_t daddr)
+{
+  dev_info_t* dev = &dev_info[daddr-1];
+  dev->mounted = true;
+
+  tuh_vid_pid_get(daddr, &dev->vid, &dev->pid);
+
+  Serial.printf("Device attached, address = %d\r\n", daddr);
+}
+
+/// Invoked when device is unmounted (bus reset/unplugged)
+void tuh_umount_cb(uint8_t daddr)
+{
+  dev_info_t* dev = &dev_info[daddr-1];
+  dev->mounted = false;
+
+  Serial.printf("Device removed, address = %d\r\n", daddr);
+}
+
+// Invoked when a device with CDC interface is mounted
+// idx is index of cdc interface in the internal pool.
+void tuh_cdc_mount_cb(uint8_t idx) {
+}
+
+// Invoked when a device with CDC interface is unmounted
+void tuh_cdc_umount_cb(uint8_t idx) {
+}
+
+}
diff --git a/src/Adafruit_TestBed.cpp b/src/Adafruit_TestBed.cpp
index b6cf5cf..45567f0 100644
--- a/src/Adafruit_TestBed.cpp
+++ b/src/Adafruit_TestBed.cpp
@@ -160,7 +160,7 @@ void Adafruit_TestBed::targetPowerCycle(uint16_t off_time) {
 /**************************************************************************/
 float Adafruit_TestBed::readAnalogVoltage(uint16_t pin, float multiplier) {
   float a = analogRead(pin);
-  //theSerial->println(a);
+  // theSerial->println(a);
 
 #if defined(ARDUINO_ARCH_ESP32) && !defined(ARDUINO_ADAFRUIT_QTPY_ESP32C3)
   if (a > 3000) {
diff --git a/src/ESP32BootROM.cpp b/src/ESP32BootROM.cpp
index b2839e1..2faf7af 100644
--- a/src/ESP32BootROM.cpp
+++ b/src/ESP32BootROM.cpp
@@ -19,7 +19,8 @@
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
-#if defined(ARDUINO_RASPBERRY_PI_PICO) || defined(__SAMD51__) || defined(ARDUINO_ARCH_SAMD)
+#if defined(ARDUINO_RASPBERRY_PI_PICO) || defined(__SAMD51__) ||               \
+    (defined(ARDUINO_ARCH_SAMD) && defined(ARM_MATH_CM0PLUS))
 
 #include "ESP32BootROM.h"
 #include "stub_esp32.h"