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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

Create USB Host Class Driver

Create USB Host Class Driver shows how to create a USB Host Class Driver using the RL-USB Library.

Class driver has to provide to the USB Host Core means to configure/unconfigure and initalize/uninitialize device of that class and also provide application with device functionality.

Creation of class driver means providing module with filled Device Class Driver structure (USBH_DCD) for USB Host Core functions and also class application level functions.

USBH_DCD usbh_dcd_cls = {

Explanation of USBH_DCD structure elements:

  • USBH_CLS_DEVICE_CLASS_ID represents ID of class that this driver will handle. This is specified by the organization. (For example ID for HID device class is 03 and for Mass Storage Device class is 08).
  • Config function should configure resources for a device of specified class.
  • UnConfig function should unconfigure resources previously configured for a device of specified class.
  • Init function should initialize the device of a specified class.
  • UnInit function should uninitialize the device of a specified class.
  • GetLastError function should return the last error code of the device of specified class.
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