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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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The Java API of the <a href="http://www.ztex.de/firmware-kit/index.e.html">ZTEX EZ-USB SDK</a>.
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<p>
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This API is the host-side counterpart of the Firmware-Kit and allows user software to interact with
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EZ-USB devices running with such firmware. It uses <a href="../ch/ntb/usb/package-summary.html">libusbJava</a>, a Java wrapper
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for the libusb 0.1 and the libusb-win32 USB libraries. This API is known to run on Linux and Windows, but should work on every operating
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system which supports libusb and Java.
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<p>
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<h2>Features</h2>
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The main features are:
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<ul>
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<li> Platform independent host software. It is possible to pack all necessary files (libusb libraries, firmware, bitstream) into
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one single jar archive which runs on both, Linux and Windows (and other OS's that support libusb and Java) </li>
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<li> Licensed as Open Source under GPLv3 </li>
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<li> Firmware upload directly into the EZ-USB Microcontroller</li>
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<li> Access to EEPROM memory</li>
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<li> Firmware upload to EEPROM</li>
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<li> Support of Flash memory </li>
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<li> Bitstream upload directly to the FPGA (for <a href="http://www.ztex.de/usb-fpga-1/usb-fpga-1.2.e.html">ZTEX USB-FPGA-Modules</a>)</li>
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<li> Bitstream upload to Flash memory (for <a href="http://www.ztex.de/usb-fpga-1/usb-fpga-1.2.e.html">ZTEX USB-FPGA-Modules</a>)</li>
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</ul>
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<p>
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<h2>Interaction with the firmware</h2>
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Firmware built using the <a href="http://www.ztex.de/firmware-kit/index.e.html">Firmware Development Kit</a> supports an additional descriptor, the ZTEX descriptor 1. This descriptor
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identifies the device and firmware, provides compatibility information (e.g. to avoid that a device is loaded with the wrong firmware)
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and specifies the communication protocol. A description of the descriptor is given in {@link ztex.ZtexDevice1}.
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<p>
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The communication protocol defines how the functions provided by the firmware (see main features above)
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can be accessed. Currently there is only one protocol implemented, the so called interface 1.
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A description of the interface is given in {@link ztex.Ztex1v1}.
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<p>
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The most importand classes for the interaction with the EZ-USB device / firmware are
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<p>
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<table bgcolor="#404040" cellspacing=1 cellpadding=4>
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<tr>
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<td bgcolor="#ffffff" valign="top">{@link ztex.ZtexDevice1}</td>
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<td bgcolor="#ffffff" valign="top">Represents an EZ-USB device that supports ZTEX descriptor 1. These devices can be found using {@link ztex.ZtexScanBus1}. </td>
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</tr>
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<tr>
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<td bgcolor="#ffffff" valign="top">{@link ztex.Ztex1}</td>
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<td bgcolor="#ffffff" valign="top">Implementation of interface-independent part of the communication protocol, e.g. uploading the firmware to the EZ-USB and renumeration management.</td>
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</tr>
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<tr>
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<td bgcolor="#ffffff" valign="top">{@link ztex.Ztex1v1}</td>
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<td bgcolor="#ffffff" valign="top">Implemenetaion of the Interface 1, i.e. the interface dependent part of the communication protocol.</td>
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</tr>
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</table>
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<p>
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<h2>SDK overview</h2>
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The following diagram gives an overview about the usage of the different parts of the <a href="http://www.ztex.de/firmware-kit/index.e.html">ZTEX EZ-USB SDK</a>.
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<p>
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<img src="../../imgs/ztex_firmware_kit-diagram.png" width="660" height="600" alt="ZTEX EZ-USB SDK overview for Linux and Windows">
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<p>
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The host software usually consists of a single jar archive which contains
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<ul>
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<li> all necessary Java bytecode; </li>
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<li> the libusb Java wrapper libraries for Linux (libusbJava.so) and Windows (libusbJava.dll), which are statically linked against libusb (no libusb installation required); </li>
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<li> the firmware for the EZ-USB device (unless not installed in EEPROM); </li>
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<li> Bitstream for the FPGA (if required). </li>
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</ul>
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This single jar archive runs on both, Linux and Windows (or other OS's that support libusb and Java).
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<p>
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On Linux this jar archive has no additional software requirements. The libusb(Java) library communicates directly with the EZ-USB device using kernel routines.
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<p>
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On Windows a libusb driver is required. (This driver is a part of the ZTEX SDK package). The libusb(Java) library communicates with the EZ-USB device using that driver.
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<h2>Related Resources</h2>
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For more information about this project visit the
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<a href="http://www.ztex.de/firmware-kit/index.e.html">ZTEX EZ-USB SDK</a> page.
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</body>
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</html>
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