[android-developers] usb MissileLauncher

I thought I would add a post about the usb MissileLauncher code found
in the samples. I discovered that the unit I bought did not work
with the given code. I could only find the STORM launcher online so I
knew there were probably some differences.

First using the AdbTest code, I found out that the vender ID was 8483
and the product ID was 4112. So I had to modify the device_filter.xml
to include an entry for my launcher.

<resources>
<!-- vendor and product ID for Dream Cheeky USB Missle Launcher --
>
<usb-device vendor-id="2689" product-id="1793" />
<!-- vendor and product ID for Dream Cheeky Wireless USB Missle
Launcher -->
<usb-device vendor-id="2689" product-id="65281" />
<!-- vendor and product ID for Dream Cheeky Storm USB Missile
Launcher (Gray)-->
<usb-device vendor-id="8483" product-id="4112" />
</resources>

When I reran the code, I found that only the "down" command would work
(after realizing that I had to unplug and replug in the device). So I
suspected the commands were different.

I found a really nice python program that handles several different
kinds of USB missile launchers:

http://code.google.com/p/pyrocket/

My particular device required an 8 byte command so I modified
sendCommand to support this format. Please forgive my Java (I'm still
learning the language). I'm sure there is a much cleaner way to do
this:

synchronized (this) {
if (control != COMMAND_STATUS) {
Log.d(TAG, "sendMove " + control);
}
if (mConnection != null) {
byte[] message = new byte[8];
//message[0] = (byte) control;

// for my device, I need an eight byte command.
message[0] = (byte) 2;
message [1]= (byte) control;
message [2] = 0;
message [3] = 0;
message [4] = 0;
message [5] = 0;
message [6]= 0;
message [7] = 0;
// Send command via a control request on endpoint zero
mConnection.controlTransfer(0x21, 0x9, 0x200, 0,
message, message.length, 0);
}
}
}

Anyway, after these modifications, the application works perfectly.
Anyway, I hope this helps anyone trying to get the code to work with
their launcher.

Marty

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