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<title>AT91 SAM7 Basic </title>
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<p class=MsoNormal align=right style='text-align:right'><!-- ******* title ********** !--><b>Version:
1.1</b></p>
<p align=center style='text-align:center'><b><span style='font-family:Georgia'>AT91
SAM7 Basic HID Project</span></b><o:p></o:p></p>
<p><!-- ******* Introduction ********** !--><span style='mso-bidi-font-size:
10.0pt'>The goal of this demonstration project is to use the SAM7A3_EK as a USB
mouse.<o:p></o:p></span></p>
<p><b>Install </b><span style='mso-bidi-font-size:10.0pt'><o:p></o:p></span></p>
<p><span style='mso-bidi-font-size:10.0pt'>Connect the AT91SAM7A3_EK board
using a standard USB cable to a host controller running HID class driver i.e.
Windows PC,<span style="mso-spacerun: yes"> </span>Linux PC, AT91RM9200
running WIN CE or Linux. <o:p></o:p></span></p>
<p><span style='mso-bidi-font-size:10.0pt'>Once enumerated, led on the board
are switched on. Clicks on buttons move the host mouse pointer. Clicking on
left and bottom buttons in the same time is equivalent to a click on the left
button on a standard mouse. Clicking on right and left buttons in the same time
is equivalent to a click on the right button on a standard mouse.<o:p></o:p></span></p>
<p><span style='mso-bidi-font-size:10.0pt'>Each time a button on the AT91SAM7A3_EK
is pressed, the corresponding led is switched off.<o:p></o:p></span></p>
<p><b>Quick description<o:p></o:p></b></p>
<p class=MsoNormal>This device enumerates as a <a href="HID1_11.pdf">standard
HID device</a>. Once the device is enumerated, the host periodically sends IN
token to the device. Each time the device detects a user action (button
pressed), it sends a report to the host which is carried by the next IN packet.
</p>
<p class=MsoNormal>The format of the report sent to the host is defined in the
mouseDescriptor[] defined in the hid_enumerate file. It contains button state
and x and y offset information.</p>
<p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
<p class=MsoNormal>The enumeration is controlled by the IsConfigured() function
in the hid_enumerate.c file. This function is called as often as possible to
detect a host disconnect. In a multithread system, this could be a dedicated
thread.</p>
<p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
<p class=MsoNormal>The main application waits for a tick sent by the RTT and
checks for button activity. If a new activity is detected, a report is sent to
the host. To increase mouse sensitivity, the tick rate can be increased
modifying the RTT configuration.</p>
<p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
<p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
<p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
<p class=MsoNormal>The application uses 3 pipes associated with physical
endpoints:</p>
<p class=MsoNormal>
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