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Atmel Corporation - USB Device Enumeration Example 1.4
USB Device Enumeration Example 1.4
Main >
USB Framework >
Enumeration example
Purpose
The "USB Core" example project illustrates how to use the USB
device framework provided by Atmel to create a simple USB
application.
Hardware Requirements
This package can be used with the following Atmel evaluation boards:
AT91SAM7S-EK (except AT91SAM7S32)
AT91SAM7X-EK
AT91SAM7SE-EK
AT91SAM7A3-EK
AT91SAM9260-EK
AT91SAM9261-EK
AT91SAM9263-EK
AT91SAM9RL-EK
AT91SAM9XE-EK
AT91SAM9G20-EK
Description
The software performs the USB enumeration phase by sending
simple descriptors to the host computer. On Microsoft Windows,
this is enough to have the operating system detect the device
and try to install it, despite having no functionality at all.
To verify that the enumeration is done properly, the USB
framework output debug traces through the DBGU. Here is the
output produced by a normal execution of the application:
-- USB Device Enumeration Project 1.4 --
USB initialization
USBD_Init
Connecting device
Conn Conn Hlr Res
Hlr Res
Hlr EoBRes CfgEpt0
Hlr Susp
Hlr Res
Hlr EoBRes CfgEpt0
Hlr Ept0 Stp Std gDesc Dev Write0(18)
Hlr Ept0 Wr 18 EoT
Hlr Ept0 Rd Ack
Hlr EoBRes CfgEpt0
Hlr Ept0 Stp Std sAddr Write0(0)
Hlr Ept0 Wr 0 EoT SetAddr(1)
Hlr Ept0 Stp Std gDesc Dev Write0(18)
Hlr Ept0 Wr 18 EoT
Hlr Ept0 Rd Ack
Hlr Ept0 Stp Std gDesc Cfg Write0(9)
Hlr Ept0 Wr 9 EoT
Hlr Ept0 Rd Ack
Hlr Ept0 Stp Std gDesc Cfg Write0(20)
Hlr Ept0 Wr 20 EoT
Hlr Ept0 Rd Ack
Hlr Ept0 Stp Std gDesc Qua Stall0
Hlr Ept0 Sta
Hlr Susp
WARNING: on the SAM7X/XC evaluation kit, the project only works in internal flash.
Usage
Build the program and download it inside the evaluation board. Please refer
to the SAM-BA User Guide,
the GNU-Based Software Development
application note or to the IAR EWARM User Guide,
depending on your chosen solution.
On the computer, open the DBGU port with a terminal application
(e.g. HyperTerminal on Microsoft Windows).
Settings: 115200 bauds, 8 bits, 1 stop bit, no parity, no flow control.
Start the application.
In the terminal window, the following text should appear:
-- USB Device Enumeration Project 1.4 --
Connect the USB cable to the board. Traces should start to
appear on the terminal. Eventually, the operating system
will report that an unknown device has been detected, and
may try to install it.
Atmel Corporation ©2008
