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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> |
| <div class="image"> |
| <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">> 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">< 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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