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USB API

Overview​

The USB API in MatrixOS provides functions for managing USB connectivity and status. The USB API is available as MatrixOS.USB and is imported by default.

The Python USB API is implemented in Applications/Python/PikaPython/MatrixOS_USB.py with type hints in Applications/Python/PikaPython/_MatrixOS_USB.pyi.

USB.Connected​

def Connected() -> bool

Checks if the device is connected to a USB host.

Returns:

  • bool: True if USB is connected, False otherwise

Example:

if MatrixOS.USB.Connected():
    print("Device is connected via USB")
else:
    print("Device is not connected to USB")

USB Status Monitoring​

Basic Connection Check​


def monitor_usb_connection():
    """Monitor USB connection status"""
    last_status = None

    while True:
        current_status = MatrixOS.USB.Connected()

        if current_status != last_status:
            if current_status:
                print("USB connected!")
            else:
                print("USB disconnected!")

            last_status = current_status

        MatrixOS.SYS.DelayMs(1000)  # Check every second

monitor_usb_connection()

USB-Dependent Functionality​

def usb_dependent_task():
    """Example of functionality that requires USB connection"""

    # Wait for USB connection
    print("Waiting for USB connection...")
    while not MatrixOS.USB.Connected():
        MatrixOS.SYS.DelayMs(100)

    print("USB connected! Starting USB-dependent operations...")

    # Now we can safely use USB-dependent features
    if MatrixOS.HID.Ready():
        print("HID is available")
        # Use HID functionality...

    # Continue with other USB operations...

usb_dependent_task()

Integration with Other Systems​

USB and HID Integration​

def safe_hid_operations():
    """Safely perform HID operations with USB checking"""

    if not MatrixOS.USB.Connected():
        print("USB not connected - HID operations unavailable")
        return False

    if not MatrixOS.HID.Ready():
        print("HID not ready")
        return False

    # Safe to use HID
    MatrixOS.HID.Keyboard.Write(KeyboardKeycode.KEY_A)
    return True

safe_hid_operations()

USB Status for Application Logic​

def adaptive_application():
    """Application that adapts behavior based on USB status"""

    while True:
        if MatrixOS.USB.Connected():
            # USB mode - can use HID, might have different behavior
            print("Running in USB mode")
            # ... USB-specific functionality

        else:
            # Standalone mode - different behavior
            print("Running in standalone mode")
            # ... standalone functionality

        MatrixOS.SYS.DelayMs(5000)  # Check every 5 seconds

adaptive_application()

USB Modes and Behavior​

The USB connection status affects various system behaviors:

  • HID Functionality: Requires active USB connection
  • Power Management: USB connection may affect sleep/power modes
  • Data Transfer: File transfer modes depend on USB connectivity
  • Device Recognition: Host OS recognition depends on USB enumeration
  • CDC Communication: Virtual serial port communication over USB

Check the specific MatrixOS configuration and device capabilities for detailed USB mode support.

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