Drivers/CMSIS/docs/DAP/html/group__DAP__SWD__Sequence.html


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<div class="title">DAP_SWD_Sequence<div class="ingroups"><a class="el" href="group__DAP__swd__gr.html">SWD Commands</a></div></div>  </div>
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<p>Generate SWD sequence and output on SWDIO or capture input from SWDIO data.  
<a href="#details">More...</a></p>
<p>Generate SWD sequence and output on SWDIO or capture input from SWDIO data. </p>
<dl class="section note"><dt>Note</dt><dd>The <a class="el" href="group__DAP__SWD__Sequence.html">DAP_SWD_Sequence</a> is available for CMSIS-DAP version 1.2 and higher. Refer to <a class="el" href="group__DAP__Info.html">DAP_Info</a> for more information on how to query the CMSIS-DAP version.</dd></dl>
<p>The <b>DAP_SWD_Sequence Command</b> is used to generate special sequences in SWD mode on the pins SWCLK and SWDIO. For example, for SWD multi-drop target selection (see picture) it is required to put the SWDIO pin to input mode (where it is not driven).</p>
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<img src="SWD_Sequence.png" alt="SWD_Sequence.png"/>
<div class="caption">
SWD sequence for multi-drop target selection</div></div>
<ul>
<li>For mode=0 (output: SWDIO is driven), the data for the SWDIO pin are part of the <b>DAP_SWD_Sequence Command</b>.</li>
<li>For mode=1 (input: SWDIO is not driven), the data from the SWDIO pin are captured and returned as part of the <b>DAP_SWD_Sequence Response</b>.</li>
</ul>
<p><b>DAP_SWD_Sequence Command</b>: </p>
<div class="fragment"><div class="line">| BYTE | BYTE **********| BYTE *********| BYTE ******|</div>
<div class="line">&gt; 0x1D | Sequence Count | Sequence Info | SWDIO Data |</div>
<div class="line">|******|****************|<span class="comment">///////////////|++++++++++++|</span></div>
</div><!-- fragment --><ul>
<li><b>Sequence Count</b>: Number of Sequences</li>
<li><b>Sequence Info</b>: Contains number of SWCLK cycles and SWDIO mode<ul>
<li>Bit 5 .. 0: Number of TCK cycles: 1 .. 64 (64 encoded as 0)</li>
<li>Bit 6: reserved</li>
<li>Bit 7: mode: 0=output (SWDIO Data in command), 1=input (SWDIO Data in response)</li>
</ul>
</li>
<li><b>SWDIO Data</b> (only for output mode): Data generated on SWDIO<ul>
<li>One bit for each TCK cycle</li>
<li>LSB transmitted first, padded to BYTE boundary</li>
</ul>
</li>
</ul>
<p><b>DAP_SWD_Sequence Response</b>: </p>
<div class="fragment"><div class="line">| BYTE | BYTE **| BYTE ******|</div>
<div class="line">&lt; 0x1D | Status | SWDIO Data |</div>
<div class="line">|******|********|++++++++++++|</div>
</div><!-- fragment --><ul>
<li><b>SWDIO Data</b> (only for input mode): Data captured from SWDIO<ul>
<li>One bit for each SWCLK cycle for input mode</li>
<li>LSB received first, padded to BYTE boundary</li>
</ul>
</li>
<li><b>Status:</b> <a class="el" href="group__DAP__Response__Status.html">Response Status</a> </li>
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