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+<title>Firmware for CoreSight Debug Access Port</title>
+<title>CMSIS-DAP: Firmware for CoreSight Debug Access Port</title>
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+ <div id="projectname">CMSIS-DAP
+ &#160;<span id="projectnumber">Version 2.0.0</span>
+ </div>
+ <div id="projectbrief">Interface Firmware for CoreSight Debug Access Port</div>
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+<div class="title">Firmware for CoreSight Debug Access Port </div> </div>
+</div><!--header-->
+<div class="contents">
+<div class="textblock"><p><b>CMSIS-DAP</b> is a specification and a implementation of a <b>Firmware</b> that supports access to the CoreSight <b>Debug Access Port</b> (DAP).<br/>
+<br/>
+ The various Arm Cortex processors provide <a href="http://www.arm.com/products/system-ip/coresight/index.php" target="_blank"><b>CoreSight Debug and Trace</b></a>. CMSIS-DAP supports target Devices that contain one or more Cortex processors. A Device provides a Debug Access Port (DAP) typically either with a 5-pin JTAG or with a 2-pin Serial Wired Debug (SWD) interface that connects to a Debug Unit. CMSIS-DAP is the interface firmware for a Debug Unit that connects the Debug Port to USB. Debuggers that execute on a host computer connect via USB and the Debug Unit to the Device which runs the application software.</p>
+<div class="image">
+<img src="CMSIS_DAP_INTERFACE.png" alt="CMSIS_DAP_INTERFACE.png"/>
+<div class="caption">
+CMSIS-DAP Overview</div></div>
+ <h2>Configuration of CMSIS-DAP Firmware </h2>
+<p>The CMSIS-DAP Firmware version 2 can be configured in two different USB interface modes:</p>
+<ul>
+<li>Version 1 configuration uses USB HID as interface to the host PC.</li>
+<li>Version 2 configuration uses WinUSB as interface to the host PC and provides high-speed SWO trace streaming.</li>
+</ul>
+<h2>Benefits of CMSIS-DAP </h2>
+<ul>
+<li>Provides a standardized interface for debuggers. Interfaces to many standard debuggers is available.</li>
+<li>Access to CoreSight registers of all Cortex processor architectures (Cortex-A/R/M).</li>
+<li>Connects via 5-pin JTAG or 2-pin Serial Wire Debug (SWD).</li>
+<li>Supports multi-core debugging.</li>
+<li>Supports Serial Wire Output of Cortex-M devices (new in CMSIS-DAP Version 1.1.0).</li>
+<li>Easy to deploy to Debug Units based on Cortex-M microcontrollers.</li>
+<li>Debug Unit may be integrated on an evaluation board.</li>
+<li>USB using HID (Human Interface Device) driver class that avoids driver installation on host PC.</li>
+<li>Supports time-critical JTAG or SWD command execution (new in CMSIS-DAP Version 1.10).</li>
+<li>Supports Test Domain Timer for time measurement using the debug unit (new in CMSIS-DAP Version 1.2.0)</li>
+</ul>
+<h1>CMSIS-DAP Firmware </h1>
+<p>The CMSIS-DAP Firmware is provided as source code and is fully configurable to a new Debug Unit. A source code template and several reference implementations for popular Debug Units are provided. Refer to <a class="el" href="group__DAP__Config__gr.html">Firmware Configuration</a> for more information.</p>
+<p>The CMSIS-DAP Software Stack is composed of the following components:</p>
+<ul>
+<li>CMSIS-DAP Firmware that interfaces to JTAG or SWD Debug pins using standard I/O pins of the Cortex-M device.</li>
+<li>CMSIS-Driver USART that connects the UART of the Cortex-M device to the SWO output from the target.</li>
+<li>USB Communication Stack that interfaces to the USB Port of the Host Computer using the HID or custom class.</li>
+<li>The USB Device middleware may require CMSIS-RTOS and a CMSIS-Driver USB.</li>
+</ul>
+<div class="image">
+<img src="CMSIS_DAP_SWStack.png" alt="CMSIS_DAP_SWStack.png"/>
+<div class="caption">
+CMSIS-DAP Software Stack</div></div>
+<p> In the examples provided the MDK Version 5 USB Communication Stack has been used. However it is possible to use alternative USB stacks instead.</p>
+<p>The CMSIS-DAP Firmware is provided in the following directory structure.</p>
+<table class="doxtable">
+<tr>
+<th align="left">Directory </th><th align="left">Description </th></tr>
+<tr>
+<td align="left">.\CMSIS\DAP\Firmware\Config </td><td align="left">CMSIS-DAP Firmware configuration </td></tr>
+<tr>
+<td align="left">.\CMSIS\DAP\Firmware\Examples </td><td align="left">CMSIS-DAP Firmware adapted to various Debug Units </td></tr>
+<tr>
+<td align="left">.\CMSIS\DAP\Firmware\Include </td><td align="left">CMSIS-DAP Firmware header file </td></tr>
+<tr>
+<td align="left">.\CMSIS\DAP\Firmware\Source </td><td align="left">CMSIS-DAP Firmware source code </td></tr>
+<tr>
+<td align="left">.\CMSIS\DAP\Firmware\Template </td><td align="left">Interface Templates for MDK Version 5 middleware </td></tr>
+</table>
+<h2>Debug Access </h2>
+<dl class="section note"><dt>Note</dt><dd>Arm plans to provide the <b>RDDI-DAP Access DLL</b> that connects a debugger to the CMSIS-DAP Firmware. However as the DAP registers are standard in all Cortex devices, the debug access is well understood by the industry.</dd></dl>
+<h2>Validation </h2>
+<p>CMSIS-DAP compliant Debug Units must be validated using the scripts provided in <a class="el" href="group__DAP__Validate__gr.html">Validate Debug Unit</a>.</p>
+<hr/>
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