diff options
Diffstat (limited to 'docs/reference/usb_classes.rst')
| -rw-r--r-- | docs/reference/usb_classes.rst | 287 |
1 files changed, 0 insertions, 287 deletions
diff --git a/docs/reference/usb_classes.rst b/docs/reference/usb_classes.rst deleted file mode 100644 index 387587b48..000000000 --- a/docs/reference/usb_classes.rst +++ /dev/null @@ -1,287 +0,0 @@ -*********** -USB Classes -*********** - -TinyUSB supports multiple USB device and host classes. This reference describes the features, capabilities, and requirements for each class. - -Device Classes -============== - -CDC (Communication Device Class) --------------------------------- - -Implements USB CDC specification for serial communication. - -**Supported Features:** -- CDC-ACM (Abstract Control Model) for virtual serial ports -- Data terminal ready (DTR) and request to send (RTS) control lines -- Line coding configuration (baud rate, parity, stop bits) -- Break signal support - -**Configuration:** -- ``CFG_TUD_CDC``: Number of CDC interfaces (1-4) -- ``CFG_TUD_CDC_EP_BUFSIZE``: Endpoint buffer size (typically 512) -- ``CFG_TUD_CDC_RX_BUFSIZE``: Receive FIFO size -- ``CFG_TUD_CDC_TX_BUFSIZE``: Transmit FIFO size - -**Key Functions:** -- ``tud_cdc_available()``: Check bytes available to read -- ``tud_cdc_read()``: Read data from host -- ``tud_cdc_write()``: Write data to host -- ``tud_cdc_write_flush()``: Flush transmit buffer - -**Callbacks:** -- ``tud_cdc_line_coding_cb()``: Line coding changed -- ``tud_cdc_line_state_cb()``: DTR/RTS state changed - -HID (Human Interface Device) ----------------------------- - -Implements USB HID specification for input devices. - -**Supported Features:** -- Boot protocol (keyboard/mouse) -- Report protocol with custom descriptors -- Input, output, and feature reports -- Multiple HID interfaces - -**Configuration:** -- ``CFG_TUD_HID``: Number of HID interfaces -- ``CFG_TUD_HID_EP_BUFSIZE``: Endpoint buffer size - -**Key Functions:** -- ``tud_hid_ready()``: Check if ready to send report -- ``tud_hid_report()``: Send HID report -- ``tud_hid_keyboard_report()``: Send keyboard report -- ``tud_hid_mouse_report()``: Send mouse report - -**Callbacks:** -- ``tud_hid_descriptor_report_cb()``: Provide report descriptor -- ``tud_hid_get_report_cb()``: Handle get report request -- ``tud_hid_set_report_cb()``: Handle set report request - -MSC (Mass Storage Class) ------------------------- - -Implements USB mass storage for file systems. - -**Supported Features:** -- SCSI transparent command set -- Multiple logical units (LUNs) -- Read/write operations -- Inquiry and capacity commands - -**Configuration:** -- ``CFG_TUD_MSC``: Number of MSC interfaces -- ``CFG_TUD_MSC_EP_BUFSIZE``: Endpoint buffer size - -**Key Functions:** -- Storage operations handled via callbacks - -**Required Callbacks:** -- ``tud_msc_inquiry_cb()``: Device inquiry information -- ``tud_msc_test_unit_ready_cb()``: Test if LUN is ready -- ``tud_msc_capacity_cb()``: Get LUN capacity -- ``tud_msc_start_stop_cb()``: Start/stop LUN -- ``tud_msc_read10_cb()``: Read data from LUN -- ``tud_msc_write10_cb()``: Write data to LUN - -Audio Class ------------ - -Implements USB Audio Class 2.0 specification. - -**Supported Features:** -- Audio streaming (input/output) -- Multiple sampling rates -- Volume and mute controls -- Feedback endpoints for asynchronous mode - -**Configuration:** -- ``CFG_TUD_AUDIO``: Number of audio functions -- Multiple configuration options for channels, sample rates, bit depth - -**Key Functions:** -- ``tud_audio_read()``: Read audio data -- ``tud_audio_write()``: Write audio data -- ``tud_audio_clear_ep_out_ff()``: Clear output FIFO - -MIDI ----- - -Implements USB MIDI specification. - -**Supported Features:** -- MIDI 1.0 message format -- Multiple virtual MIDI cables -- Standard MIDI messages - -**Configuration:** -- ``CFG_TUD_MIDI``: Number of MIDI interfaces -- ``CFG_TUD_MIDI_RX_BUFSIZE``: Receive buffer size -- ``CFG_TUD_MIDI_TX_BUFSIZE``: Transmit buffer size - -**Key Functions:** -- ``tud_midi_available()``: Check available MIDI messages -- ``tud_midi_read()``: Read MIDI packet -- ``tud_midi_write()``: Send MIDI packet - -DFU (Device Firmware Update) ----------------------------- - -Implements USB DFU specification for firmware updates. - -**Supported Modes:** -- DFU Mode: Device enters DFU for firmware update -- DFU Runtime: Request transition to DFU mode - -**Configuration:** -- ``CFG_TUD_DFU``: Enable DFU mode -- ``CFG_TUD_DFU_RUNTIME``: Enable DFU runtime - -**Key Functions:** -- Firmware update operations handled via callbacks - -**Required Callbacks:** -- ``tud_dfu_download_cb()``: Receive firmware data -- ``tud_dfu_manifest_cb()``: Complete firmware update - -Vendor Class ------------- - -Custom vendor-specific USB class implementation. - -**Features:** -- Configurable endpoints -- Custom protocol implementation -- WebUSB support -- Microsoft OS descriptors - -**Configuration:** -- ``CFG_TUD_VENDOR``: Number of vendor interfaces -- ``CFG_TUD_VENDOR_EPSIZE``: Endpoint size - -**Key Functions:** -- ``tud_vendor_available()``: Check available data -- ``tud_vendor_read()``: Read vendor data -- ``tud_vendor_write()``: Write vendor data - -Host Classes -============ - -CDC Host --------- - -Connect to CDC devices (virtual serial ports). - -**Supported Devices:** -- CDC-ACM devices -- FTDI USB-to-serial converters -- CP210x USB-to-serial converters -- CH34x USB-to-serial converters - -**Configuration:** -- ``CFG_TUH_CDC``: Number of CDC host instances -- ``CFG_TUH_CDC_FTDI``: Enable FTDI support -- ``CFG_TUH_CDC_CP210X``: Enable CP210x support - -**Key Functions:** -- ``tuh_cdc_available()``: Check available data -- ``tuh_cdc_read()``: Read from CDC device -- ``tuh_cdc_write()``: Write to CDC device -- ``tuh_cdc_set_baudrate()``: Configure serial settings - -HID Host --------- - -Connect to HID devices (keyboards, mice, etc.). - -**Supported Devices:** -- Boot keyboards and mice -- Generic HID devices with report descriptors -- Composite HID devices - -**Configuration:** -- ``CFG_TUH_HID``: Number of HID host instances -- ``CFG_TUH_HID_EPIN_BUFSIZE``: Input endpoint buffer size - -**Key Functions:** -- ``tuh_hid_receive_report()``: Start receiving reports -- ``tuh_hid_send_report()``: Send report to device -- ``tuh_hid_parse_report_descriptor()``: Parse HID descriptors - -MSC Host --------- - -Connect to mass storage devices (USB drives). - -**Supported Features:** -- SCSI transparent command set -- FAT file system support (with FatFS integration) -- Multiple LUNs per device - -**Configuration:** -- ``CFG_TUH_MSC``: Number of MSC host instances -- ``CFG_TUH_MSC_MAXLUN``: Maximum LUNs per device - -**Key Functions:** -- ``tuh_msc_ready()``: Check if device is ready -- ``tuh_msc_read10()``: Read sectors from device -- ``tuh_msc_write10()``: Write sectors to device - -Hub ---- - -Support for USB hubs to connect multiple devices. - -**Features:** -- Multi-level hub support -- Port power management -- Device connect/disconnect detection - -**Configuration:** -- ``CFG_TUH_HUB``: Number of hub instances -- ``CFG_TUH_DEVICE_MAX``: Total connected devices - -Class Implementation Guidelines -=============================== - -Descriptor Requirements ------------------------ - -Each USB class requires specific descriptors: - -1. **Interface Descriptor**: Defines the class type -2. **Endpoint Descriptors**: Define communication endpoints -3. **Class-Specific Descriptors**: Additional class requirements -4. **String Descriptors**: Human-readable device information - -Callback Implementation ------------------------ - -Most classes require callback functions: - -- **Mandatory callbacks**: Must be implemented for class to function -- **Optional callbacks**: Provide additional functionality -- **Event callbacks**: Called when specific events occur - -Performance Considerations --------------------------- - -When implementing USB classes, match **buffer sizes** to expected data rates to avoid bottlenecks. Choose appropriate **transfer types** based on your application's requirements. Keep **callback processing** lightweight for optimal performance. Avoid **memory allocations in critical paths** where possible to maintain consistent performance. - -Testing and Validation ----------------------- - -- **USB-IF Compliance**: Ensure descriptors meet USB standards -- **Host Compatibility**: Test with multiple operating systems -- **Performance Testing**: Verify transfer rates and latency -- **Error Handling**: Test disconnect/reconnect scenarios - -Class-Specific Resources -======================== - -- **USB-IF Specifications**: Official USB class specifications -- **Example Code**: Reference implementations in ``examples/`` directory -- **Test Applications**: Host-side test applications for validation -- **Debugging Tools**: USB protocol analyzers and debugging utilities
\ No newline at end of file |