349 lines
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349 lines
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<div class="header">
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<a href="#define-members">Macros</a> |
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<a href="#enum-members">Enumerations</a> </div>
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<div class="headertitle">
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<div class="title">DMA Manager</div> </div>
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</div><!--header-->
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<div class="contents">
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<a name="details" id="details"></a><h2 class="groupheader">Overview</h2>
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<p>DMA Manager provides a series of functions to manage the DMAMUX channels.</p>
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<h1><a class="anchor" id="DMAMGRFunGrps"></a>
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Function groups</h1>
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<h2><a class="anchor" id="DMAMGRInit"></a>
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DMAMGR Initialization and De-initialization</h2>
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<p>This function group initializes and deinitializes the DMA Manager.</p>
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<h2><a class="anchor" id="DMAMGROper"></a>
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DMAMGR Operation</h2>
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<p>This function group requests/releases the DMAMUX channel and configures the channel request source.</p>
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<h1><a class="anchor" id="DMATypicalUseCase"></a>
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Typical use case</h1>
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<h2><a class="anchor" id="DMAMGRStaticOper"></a>
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DMAMGR static channel allocate</h2>
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<div class="fragment"><div class="line">DMAMUX_Type *dmamux_base;</div>
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<div class="line">uint8_t channel;</div>
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<div class="line"></div>
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<div class="line"><span class="comment">/* Initialize DMAMGR */</span></div>
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<div class="line"><a class="code" href="group__dmamgr.html#ga0c4deb53f1857a9abfed9d35ad2013f4">DMAMGR_Init</a>();</div>
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<div class="line"><span class="comment">/* Request a DMAMUX channel by static allocate mechanism */</span></div>
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<div class="line">dmamux_base = DMAMUX0;</div>
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<div class="line">channel = 0;</div>
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<div class="line"><a class="code" href="group__dmamgr.html#ga459bfef3fee6f8a70345c3f43aaefc7a">DMAMGR_RequestChannel</a>(kDmaRequestMux0AlwaysOn63, &dmamux_base, &channel, kDMAMGR_STATIC_ALLOCATE);</div>
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</div><!-- fragment --><h2><a class="anchor" id="DMAMGRDynamicOper"></a>
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DMAMGR dynamic channel allocate</h2>
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<div class="fragment"><div class="line">DMAMUX_Type *dmamux_base;</div>
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<div class="line">uint8_t channel;</div>
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<div class="line"></div>
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<div class="line"><span class="comment">/* Initialize DMAMGR */</span></div>
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<div class="line"><a class="code" href="group__dmamgr.html#ga0c4deb53f1857a9abfed9d35ad2013f4">DMAMGR_Init</a>();</div>
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<div class="line"><span class="comment">/* Request a DMAMUX channel by static allocate mechanism */</span></div>
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<div class="line">dmamux_base = DMAMUX0;</div>
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<div class="line">channel = 0;</div>
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<div class="line"><a class="code" href="group__dmamgr.html#ga459bfef3fee6f8a70345c3f43aaefc7a">DMAMGR_RequestChannel</a>(kDmaRequestMux0AlwaysOn63, &dmamux_base, &channel, kDMAMGR_DYNAMIC_ALLOCATE);</div>
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</div><!-- fragment --> <table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
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Macros</h2></td></tr>
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<tr class="memitem:ga390892af660b787eb16998f5170870d6"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dmamgr.html#ga390892af660b787eb16998f5170870d6">DMAMGR_DYNAMIC_ALLOCATE</a>   0xFFU</td></tr>
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<tr class="memdesc:ga390892af660b787eb16998f5170870d6"><td class="mdescLeft"> </td><td class="mdescRight">Dynamic channel allocate mechanism. <a href="#ga390892af660b787eb16998f5170870d6">More...</a><br/></td></tr>
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<tr class="separator:ga390892af660b787eb16998f5170870d6"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="enum-members"></a>
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Enumerations</h2></td></tr>
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<tr class="memitem:ga7d34995d8cecdd16c6959a909ae4aab0"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dmamgr.html#ga7d34995d8cecdd16c6959a909ae4aab0">_dma_manager_status</a> { <br/>
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  <a class="el" href="group__dmamgr.html#gga7d34995d8cecdd16c6959a909ae4aab0a00c5d9b573b538fb7c609f9002994d10">kStatus_DMAMGR_ChannelOccupied</a> = MAKE_STATUS(kStatusGroup_DMAMGR, 0),
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<br/>
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  <a class="el" href="group__dmamgr.html#gga7d34995d8cecdd16c6959a909ae4aab0a4c9904a84af833e605db372c035ab677">kStatus_DMAMGR_ChannelNotUsed</a> = MAKE_STATUS(kStatusGroup_DMAMGR, 1),
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<br/>
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  <a class="el" href="group__dmamgr.html#gga7d34995d8cecdd16c6959a909ae4aab0a91dcc0b4f5c4fcb00d3ebb8394c54279">kStatus_DMAMGR_NoFreeChannel</a> = MAKE_STATUS(kStatusGroup_DMAMGR, 2),
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<br/>
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  <a class="el" href="group__dmamgr.html#gga7d34995d8cecdd16c6959a909ae4aab0a4d55f7ec29d2103b766b88991a5c1b76">kStatus_DMAMGR_ChannelNotMatchSource</a> = MAKE_STATUS(kStatusGroup_DMAMGR, 3)
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<br/>
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}</td></tr>
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<tr class="memdesc:ga7d34995d8cecdd16c6959a909ae4aab0"><td class="mdescLeft"> </td><td class="mdescRight">DMA manager status. <a href="group__dmamgr.html#ga7d34995d8cecdd16c6959a909ae4aab0">More...</a><br/></td></tr>
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<tr class="separator:ga7d34995d8cecdd16c6959a909ae4aab0"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="member-group"></a>
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DMAMGR Initialize and De-initialize</h2></td></tr>
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<tr class="memitem:ga0c4deb53f1857a9abfed9d35ad2013f4"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dmamgr.html#ga0c4deb53f1857a9abfed9d35ad2013f4">DMAMGR_Init</a> (void)</td></tr>
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<tr class="memdesc:ga0c4deb53f1857a9abfed9d35ad2013f4"><td class="mdescLeft"> </td><td class="mdescRight">Initializes the DAM manager. <a href="#ga0c4deb53f1857a9abfed9d35ad2013f4">More...</a><br/></td></tr>
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<tr class="separator:ga0c4deb53f1857a9abfed9d35ad2013f4"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga008267a3c66fd0beaef277ddd22fbd21"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dmamgr.html#ga008267a3c66fd0beaef277ddd22fbd21">DMAMGR_Deinit</a> (void)</td></tr>
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<tr class="memdesc:ga008267a3c66fd0beaef277ddd22fbd21"><td class="mdescLeft"> </td><td class="mdescRight">Deinitializes the DMA manager. <a href="#ga008267a3c66fd0beaef277ddd22fbd21">More...</a><br/></td></tr>
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<tr class="separator:ga008267a3c66fd0beaef277ddd22fbd21"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="member-group"></a>
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DMAMGR Operation</h2></td></tr>
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<tr class="memitem:ga459bfef3fee6f8a70345c3f43aaefc7a"><td class="memItemLeft" align="right" valign="top">status_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dmamgr.html#ga459bfef3fee6f8a70345c3f43aaefc7a">DMAMGR_RequestChannel</a> (dma_request_source_t requestSource, uint8_t virtualChannel, void *handle)</td></tr>
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<tr class="memdesc:ga459bfef3fee6f8a70345c3f43aaefc7a"><td class="mdescLeft"> </td><td class="mdescRight">Requests a DMA channel. <a href="#ga459bfef3fee6f8a70345c3f43aaefc7a">More...</a><br/></td></tr>
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<tr class="separator:ga459bfef3fee6f8a70345c3f43aaefc7a"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga6a24fb306fb217b5b38ea29e6d3a3f56"><td class="memItemLeft" align="right" valign="top">status_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dmamgr.html#ga6a24fb306fb217b5b38ea29e6d3a3f56">DMAMGR_ReleaseChannel</a> (void *handle)</td></tr>
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<tr class="memdesc:ga6a24fb306fb217b5b38ea29e6d3a3f56"><td class="mdescLeft"> </td><td class="mdescRight">Releases a DMA channel. <a href="#ga6a24fb306fb217b5b38ea29e6d3a3f56">More...</a><br/></td></tr>
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<tr class="separator:ga6a24fb306fb217b5b38ea29e6d3a3f56"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<h2 class="groupheader">Macro Definition Documentation</h2>
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<a class="anchor" id="ga390892af660b787eb16998f5170870d6"></a>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">#define DMAMGR_DYNAMIC_ALLOCATE   0xFFU</td>
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</tr>
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</table>
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</div><div class="memdoc">
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</div>
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</div>
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<h2 class="groupheader">Enumeration Type Documentation</h2>
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<a class="anchor" id="ga7d34995d8cecdd16c6959a909ae4aab0"></a>
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<div class="memitem">
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<div class="memproto">
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<td class="memname">enum <a class="el" href="group__dmamgr.html#ga7d34995d8cecdd16c6959a909ae4aab0">_dma_manager_status</a></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<table class="fieldtable">
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><em><a class="anchor" id="gga7d34995d8cecdd16c6959a909ae4aab0a00c5d9b573b538fb7c609f9002994d10"></a>kStatus_DMAMGR_ChannelOccupied</em> </td><td class="fielddoc">
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<p>Channel has been occupied. </p>
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</td></tr>
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<tr><td class="fieldname"><em><a class="anchor" id="gga7d34995d8cecdd16c6959a909ae4aab0a4c9904a84af833e605db372c035ab677"></a>kStatus_DMAMGR_ChannelNotUsed</em> </td><td class="fielddoc">
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<p>Channel has not been used. </p>
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</td></tr>
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<tr><td class="fieldname"><em><a class="anchor" id="gga7d34995d8cecdd16c6959a909ae4aab0a91dcc0b4f5c4fcb00d3ebb8394c54279"></a>kStatus_DMAMGR_NoFreeChannel</em> </td><td class="fielddoc">
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<p>All channel has been occupied. </p>
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</td></tr>
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<tr><td class="fieldname"><em><a class="anchor" id="gga7d34995d8cecdd16c6959a909ae4aab0a4d55f7ec29d2103b766b88991a5c1b76"></a>kStatus_DMAMGR_ChannelNotMatchSource</em> </td><td class="fielddoc">
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<p>Channel do not match the request source. </p>
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</td></tr>
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</table>
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</div>
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</div>
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<h2 class="groupheader">Function Documentation</h2>
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<a class="anchor" id="ga0c4deb53f1857a9abfed9d35ad2013f4"></a>
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<td class="memname">void DMAMGR_Init </td>
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<td>(</td>
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<td class="paramtype">void </td>
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<td class="paramname"></td><td>)</td>
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<td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>This function initializes the DMA manager, ungates all DMAMUX clocks, and initializes the eDMA or DMA peripheral. </p>
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</div>
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</div>
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<a class="anchor" id="ga008267a3c66fd0beaef277ddd22fbd21"></a>
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<div class="memitem">
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<td class="memname">void DMAMGR_Deinit </td>
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<td>(</td>
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<td class="paramtype">void </td>
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<td class="paramname"></td><td>)</td>
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<td></td>
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</table>
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</div><div class="memdoc">
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<p>This function deinitializes the DMA manager, disables all DMAMUX channel, gates all DMAMUX clock, and deinitializes the eDMA or DMA peripheral. </p>
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</div>
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</div>
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<a class="anchor" id="ga459bfef3fee6f8a70345c3f43aaefc7a"></a>
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<td class="memname">status_t DMAMGR_RequestChannel </td>
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<td>(</td>
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<td class="paramtype">dma_request_source_t </td>
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<td class="paramname"><em>requestSource</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint8_t </td>
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<td class="paramname"><em>virtualChannel</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">void * </td>
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<td class="paramname"><em>handle</em> </td>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</div><div class="memdoc">
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<p>This function request a DMA channel which is not occupied. There are two channels to allocate the mechanism dynamic and static. For the dynamic allocation mechanism (virtualChannel = DMAMGR_DYNAMIC_ALLOCATE), DMAMGR allocates a DMA channel according to the given request source and then configure it. For static allocation mechanism, DMAMGR configures the given channel according to the given request source and channel number.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">requestSource</td><td>DMA channel request source number. See the soc.h. </td></tr>
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<tr><td class="paramname">virtualChannel</td><td>The channel number user wants to occupy. If using the dynamic channel allocate mechanism, set the virtualChannel equal to DMAMGR_DYNAMIC_ALLOCATE. </td></tr>
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<tr><td class="paramname">handle</td><td>DMA or eDMA handle pointer. </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="retval"><dt>Return values</dt><dd>
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<table class="retval">
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<tr><td class="paramname">kStatus_Success</td><td>In dynamic/static channel allocate mechanism, allocate DMAMUX channel successfully. </td></tr>
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<tr><td class="paramname">kStatus_DMAMGR_NoFreeChannel</td><td>In dynamic channel allocate mechanism, all DMAMUX channels has been occupied. </td></tr>
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<tr><td class="paramname">kStatus_DMAMGR_ChannelNotMatchSource</td><td>In static channel allocate mechanism, the given channel do not match the given request. </td></tr>
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<tr><td class="paramname">kStatus_DMAMGR_ChannelOccupied</td><td>In static channel allocate mechanism, the given channel has been occupied. </td></tr>
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</table>
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</dd>
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</dl>
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</div>
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</div>
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<a class="anchor" id="ga6a24fb306fb217b5b38ea29e6d3a3f56"></a>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">status_t DMAMGR_ReleaseChannel </td>
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<td>(</td>
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<td class="paramtype">void * </td>
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<td class="paramname"><em>handle</em></td><td>)</td>
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<td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>This function releases an occupied DMA channel.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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|
<table class="params">
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|
<tr><td class="paramname">handle</td><td>DMA or eDMA handle pointer. </td></tr>
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|
</table>
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|
</dd>
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|
</dl>
|
|
<dl class="retval"><dt>Return values</dt><dd>
|
|
<table class="retval">
|
|
<tr><td class="paramname">kStatus_Success</td><td>Release the given channel successfully. </td></tr>
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<tr><td class="paramname">kStatus_DMAMGR_ChannelNotUsed</td><td>The given channel which to be released is not been used before. </td></tr>
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</table>
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</dd>
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</dl>
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