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<title>CMSIS-DAP: CMSIS-DAP Commands</title>
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<div id="projectname">CMSIS-DAP
 <span id="projectnumber">Version 2.0.0</span>
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<div id="projectbrief">Interface Firmware for CoreSight Debug Access Port</div>
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<p>Commands between Debug Unit and host computer.
<a href="#details">More...</a></p>
<table class="memberdecls">
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Content</h2></td></tr>
<tr class="memitem:group__DAP__genCommands__gr"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DAP__genCommands__gr.html">General Commands</a></td></tr>
<tr class="memdesc:group__DAP__genCommands__gr"><td class="mdescLeft"> </td><td class="mdescRight">Information and Control commands for the CMSIS-DAP Debug Unit. <br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:group__DAP__swj__gr"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DAP__swj__gr.html">Common SWD/JTAG Commands</a></td></tr>
<tr class="memdesc:group__DAP__swj__gr"><td class="mdescLeft"> </td><td class="mdescRight">Set SWD/JTAG clock and control/monitor SWD/JTAG I/O pins. <br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:group__DAP__swd__gr"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DAP__swd__gr.html">SWD Commands</a></td></tr>
<tr class="memdesc:group__DAP__swd__gr"><td class="mdescLeft"> </td><td class="mdescRight">Configure the parameters for SWD mode. <br/></td></tr>
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<tr class="memdesc:group__DAP__swo__gr"><td class="mdescLeft"> </td><td class="mdescRight">Configure the parameters for SWO mode. <br/></td></tr>
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<tr class="memitem:group__DAP__jtag__gr"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DAP__jtag__gr.html">JTAG Commands</a></td></tr>
<tr class="memdesc:group__DAP__jtag__gr"><td class="mdescLeft"> </td><td class="mdescRight">Detect and configure the JTAG device chain. <br/></td></tr>
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<tr class="memitem:group__DAP__transfer__gr"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DAP__transfer__gr.html">Transfer Commands</a></td></tr>
<tr class="memdesc:group__DAP__transfer__gr"><td class="mdescLeft"> </td><td class="mdescRight">Read and Writes to CoreSight registers. <br/></td></tr>
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<tr class="memitem:group__DAP__atomic__gr"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DAP__atomic__gr.html">Atomic Commands</a></td></tr>
<tr class="memdesc:group__DAP__atomic__gr"><td class="mdescLeft"> </td><td class="mdescRight">Execute atomic commands. <br/></td></tr>
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<tr class="memitem:group__DAP__Response__Status"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__DAP__Response__Status.html">Response Status</a></td></tr>
<tr class="memdesc:group__DAP__Response__Status"><td class="mdescLeft"> </td><td class="mdescRight">Status Information in Response Data. <br/></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
<p>Commands between Debug Unit and host computer. </p>
<p>This section explains each command that is exchanged between the Debug Unit and the host computer. Every Command starts with a Command-ID and optional data. Depending on the Command, the CMSIS-DAP firmware replies with a Response that repeats the Command-ID and delivers additional data.</p>
<p>Command and Response data have a package size limitation that is defined with <a class="el" href="group__DAP__Config__Debug__gr.html#gaa28bb1da2661291634c4a8fb3e227404">DAP_PACKET_SIZE</a>. This configuration setting can be obtained with the command <a class="el" href="group__DAP__Info.html">DAP_Info</a> and is used to optimize the performance for Full-Speed or High-Speed USB. The debugger must ensure that each data package fits within the limitations of the configured <a class="el" href="group__DAP__Config__Debug__gr.html#gaa28bb1da2661291634c4a8fb3e227404">DAP_PACKET_SIZE</a>.</p>
<dl class="section note"><dt>Note</dt><dd>Commands that are not implemented reply with 0xFF instead of repeating the command byte.</dd></dl>
<h2>Conventions and Command Structure </h2>
<p>The following conventions describe the command semantic used in the following documentation:</p>
<table class="doxtable">
<tr>
<th>Symbol </th><th>Description </th></tr>
<tr>
<td>> </td><td>Prefix indicating the direction: Command from host to Debug Unit. </td></tr>
<tr>
<td>< </td><td>Prefix indicating the direction: Response from Debug Unit to host. </td></tr>
<tr>
<td>BYTE </td><td>8-bit value. </td></tr>
<tr>
<td>SHORT </td><td>16-bit value (low byte first). </td></tr>
<tr>
<td>WORD </td><td>32-bit value (low byte first). </td></tr>
<tr>
<td>LWORD </td><td>64-bit value (low byte first). </td></tr>
<tr>
<td>FLOAT </td><td>32-bit single precision floating point value (LSB first). </td></tr>
<tr>
<td>0x01 </td><td>Fixed HEX value in C notation. Used for example to identify a command. </td></tr>
<tr>
<td>Reserved </td><td>The field above is reserved for future extension. </td></tr>
<tr>
<td>**** </td><td>The field above has exactly one occurrence. </td></tr>
<tr>
<td>++++ </td><td>The field above has a variable length. </td></tr>
<tr>
<td>////// </td><td>The field above is repeated and may appear 0..n times. </td></tr>
</table>
<p>The commands are described in a structure consisting of three lines.</p>
<ul>
<li>The first line indicates the field type.</li>
<li>The second line indicates the communication direction and the command structure.</li>
<li>The third line indicates the occurrence of the field.</li>
</ul>
<p><b>Examples:</b> </p>
<div class="fragment"><div class="line">| BYTE | SHORT *| WORD ***|</div>
<div class="line">> 0x99 | RecLen | Data |</div>
<div class="line">|******|********|+++++++++| </div>
</div><!-- fragment --><p>The Command with the Command-ID <em>0x99</em> is sent from the host computer to the Debug Unit. The value of <em>RecLen</em> indicates the number of WORDS that follow with <em>Data</em>. <em>Data</em> is repeated several times depending on the value of <em>RecLen</em>.</p>
<p>Depending on the Command the Debug Unit may send a <b>Response</b>. </p>
<div class="fragment"><div class="line">| BYTE ***| WORD***********|</div>
<div class="line">< 0 | Register Value |</div>
<div class="line">|*Reserved|****************|</div>
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