USB

Driver Implementations

The Pack Content provides implementations of CMSIS-USB drivers for the following controllers:

Driver	Description
EHCI	USB Host Driver for the EHCI with Transaction Translator (TT) host controller.
OHCI	USB Host Driver for the OHCI host controller.

EHCI

Enhanced Host Controller Interface (EHCI) with TT is EHCI controller with integrated Transaction Translator that supports high/full/low-speed devices.

It is usually used in embedded devices to remove the requirement of having additional host controller (OHCI) for handling full/low-speed devices separately.

This driver exports up to 2 driver instances thus it can support 2 EHCI with TT host controllers.

It requires hardware-specific functions implementation that are available in the template module USBH_EHCI_HW.c.

It is configured via define values in the USBH_EHCI_Config.h configuration file.

Configuration

• USB Host Controller 0:
  • Export control block Driver_USBH#: Specifies the exported driver control block number.
  • EHCI Registers base address: Specifies the absolute address at which EHCI controller registers are located.
  • Locate EHCI Communication Area: Specifies if the communication area is located in a specific memory (via the linker script):
    • Section name: Specifies the section name for the EHCI communication area (for positioning via the linker script).
• USB Host Controller 1 (can be enabled/disabled):
  • Export control block Driver_USBH#: Specifies the exported driver control block number.
  • EHCI Registers base address: Specifies the absolute address at which EHCI controller registers are located.
  • Locate EHCI Communication Area: Specifies if the communication area is located in a specific memory (via the linker script):
    • Section name: Specifies the section name for the EHCI communication area (for positioning via the linker script).
• Maximum number of Pipes (per controller): Specifies the maximum number of pipes that the driver will support (per controller).

OHCI

Open Host Controller Interface (OHCI) is a host controller interface that supports full/low-speed devices.

This driver exports up to 2 driver instances thus it can support 2 OHCI host controllers.

It requires hardware-specific functions implementation that are available in the template module USBH_OHCI_HW.c.

It is configured via define values in the USBH_OHCI_Config.h configuration file.

Configuration

• USB Host Controller 0:
  • Export control block Driver_USBH#: Specifies the exported driver control block number.
  • OHCI Registers base address: Specifies the absolute address at which OHCI controller registers are located.
  • Locate OHCI Communication Area (HCCA): Specifies if the communication area is located in a specific memory (via the linker script):
    • Section name: Specifies the section name for the OHCI communication area (for positioning via the linker script).
• USB Host Controller 1 (can be enabled/disabled):
  • Export control block Driver_USBH#: Specifies the exported driver control block number.
  • OHCI Registers base address: Specifies the absolute address at which OHCI controller registers are located.
  • Locate OHCI Communication Area (HCCA): Specifies if the communication area is located in a specific memory (via the linker script):
    • Section name: Specifies the section name for the OHCI communication area (for positioning via the linker script).
• Maximum number of Pipes (per controller): Specifies the maximum number of pipes that the driver will support (per controller).