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<title>CMSIS-DAP: DAP_SWJ_Pins</title>
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<div id="projectname">CMSIS-DAP
 <span id="projectnumber">Version 1.1.0</span>
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<div id="projectbrief">Interface Firmware for CoreSight Debug Access Port</div>
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<div class="title">DAP_SWJ_Pins</div> </div>
<div class="ingroups"><a class="el" href="group___d_a_p__swj__gr.html">Common SWD/JTAG Commands</a></div></div><!--header-->
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<p>Control and monitor SWD/JTAG Pins.
<a href="#details">More...</a></p>
<p>Control and monitor SWD/JTAG Pins. </p>
<p>The <b>DAP_SWJ_Pins Command</b> is used to monitor and control the I/O Pins including the nRESET Device reset line.</p>
<p>The <b>Pin Wait</b> time is useful in systems where the nRESET pin is implemented as open-drain output. After nRESET is de-asserted by the debugger, external circuit may still hold the target Device under reset for a time. Using the <b>Pin Wait</b> time, the debugger may monitor selected I/O Pins and wait until they the expected value appears or a timeout expires.</p>
<p><b>I/O Pin Mapping</b> for the fields <b>Pin Output</b>, <b>Pin Select</b>, and <b>Pin Input</b>:</p>
<ul>
<li>Bit 0: SWCLK/TCK</li>
<li>Bit 1: SWDIO/TMS</li>
<li>Bit 2: TDI</li>
<li>Bit 3: TDO</li>
<li>Bit 5: nTRST</li>
<li>Bit 7: nRESET</li>
</ul>
<p><b>DAP_SWJ_Pins Command</b>: </p>
<div class="fragment"><div class="line"> BYTE | BYTE ******| BYTE ******| Word ****|</div>
<div class="line">> 0x10 | Pin Output | Pin Select | Pin Wait |</div>
<div class="line"> ******|************|************|**********|</div>
</div><!-- fragment --><ul>
<li><b>Pin Output</b>: Value for selected output pins</li>
<li><b>Pin Select</b>: Selects which output pins will be modified</li>
<li><b>Pin Wait</b>: Wait timeout for the selected output to stabilize<ul>
<li>0 = no wait</li>
<li>1 .. 3000000 = time in µs (max 3s)</li>
</ul>
</li>
</ul>
<p><b>DAP_SWJ_Pins Response:</b> </p>
<div class="fragment"><div class="line"> BYTE | BYTE *****|</div>
<div class="line">< 0x10 | Pin Input |</div>
<div class="line"> ******|***********|</div>
</div><!-- fragment --><ul>
<li><b>Pin Input</b>: Pin state read from target Device. </li>
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