|
||
| Products Download Events Support Videos | ||
Technical Support
On-Line Manuals
RL-ARM User's Guide (MDK v4)
RL-RTX
RL-FlashFS
RL-TCPnet
RL-CAN
RL-USB
RL-USB for USB Device Applications
RL-USB Device Library
RL-USB Device Features
RL-USB Device Software Stack
RL-USB Device Functions
RL-USB Device Source Files
RL-USB Device Configuration
Audio Device (ADC) Options
Communication Device (CDC) - ACM Options
Human Interface Device (HID) Options
Mass Storage Device (MSC) Options
Create USB Device Applications
Create ADC Applications
Create CDC ACM Applications
Create HID Applications
Create MSC Applications
Create Composite Applications
Test USB Device Applications
Compliance Tests
Test HID Client Application
RL-USB for USB Host Applications
RL-USB Host Library
RL-USB Host Features
RL-USB Host Software Stack
RL-USB Host Functions
RL-USB Host Source Files
RL-USB Host Configuration
Host Controller Driver Selection
Host Controller Driver Configuration
Host Class Driver Selection
Create USB Host Applications
Create USB Host HID Applications
HID_Kbd Example
Create USB Host MSC Applications
Create USB Host Class Driver
RL-USB Host Constants and Structures
Error constants
Speed constants
Transaction Packet Type constants
Transaction Error Type constants
USB Request Block structure (USBH_URB)
Endpoint structure (USBH_EP)
Driver Capabilites structure (USBH_HCI_CAP)
Device Class Instance structure (USBH_DCI)
Host Controller Instance structure (USBH_HCI)
Host Controller Driver structure (USBH_HCD)
USB Concepts
USB Transfer Rates
USB Network
Basic Communication Model
USB Protocol
Control Transfer
Interrupt Transfer
Isochronous Transfer
Bulk Transfer
Descriptors
Device Configuration
Device Descriptor
Configuration Descriptor
Interface Descriptor
Endpoint Descriptor
Device Qualifier Descriptor
Example Programs
Library Reference
Appendix
Endpoint Descriptor
The Endpoint Descriptor is used to specify the transfer type, direction, polling interval, and maximum packet size for each endpoint. Endpoint zero, the default endpoint, is always assumed to be a control endpoint and never has a descriptor.
| Offset | Field | Size | Value | Description |
|---|---|---|---|---|
| 0 | bLength | 1 | Number | Size of this descriptor in bytes. |
| 1 | bDescriptorType | 1 | Constant | Endpoint Descriptor Type (05h). |
| 2 | bEndpointAddress | 1 | Endpoint | The address of the endpoint on the USB device described by
this descriptor. The address is encoded as follows: Bit 3...0: The endpoint number Bit 6...4: Reserved, reset to zero Bit 7: Direction, ignored for control endpoints. 0 = OUT endpoint 1 = IN endpoint |
| 3 | bmAttributes | 1 | Bitmap | The endpoint’s attribute when configured through
bConfigurationValue. Bits 1..0: Transfer Type 00 = Control 01 = Isochronous 10 = Bulk 11 = Interrupt For non-isochronous endpoints, bits 5..2 must be set to zero. For isochronous endpoints, they are defined as: Bits 3..2: Synchronization Type 00 = No Synchronization 01 = Asynchronous 10 = Adaptive 11 = Synchronous Bits 5..4: Usage Type 00 = Data 01 = Feedback 10 = Implicit feedback 11 = Reserved All other bits are reserved and must be reset to zero. |
| 4 | wMaxPacketSize | 2 | Number | Is the maximum packet size of this endpoint. For isochronous endpoints, this value is used to reserve the time on the bus, required for the per-(micro)frame data payloads. Bits 10..0 = max. packet size (in bytes). For high-speed isochronous and interrupt endpoints: Bits 12..11 = number of additional transaction opportunities per micro-frame: 00 = None (1 transaction per micro-frame) 01 = 1 additional (2 per micro-frame) 10 = 2 additional (3 per micro-frame) 11 = Reserved Bits 15..13 are reserved and must be set to zero. |
| 6 | bInterval | 1 | Number | Interval for polling endpoint for data transfers. Expressed in frames or micro-frames depending on the operating speed (1 ms, or 125 µs units). |
ProductsDevelopment Tools |
Hardware & Collateral |
Downloads |
Support |
Contact |
 |
||||