begriffs open source - cmsis/blob - main/Driver/group__USBH__packets.html

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 129 <div class="header">
 130   <div class="summary">
 131 <a href="#define-members">Macros</a>  </div>
 132   <div class="headertitle"><div class="title">USBH Packet Information<div class="ingroups"><a class="el" href="group__usb__interface__gr.html">USB Interface</a> &raquo; <a class="el" href="group__usbh__interface__gr.html">USB Host Interface</a> &raquo; <a class="el" href="group__usbh__host__gr.html">USB Host</a></div></div></div>
 133 </div><!--header-->
 134 <div class="contents">
 135
 136 <p>Specify USB packet information used by the function <a class="el" href="group__usbh__host__gr.html#ga817d503a24ad8927fa362c8f6394920d">ARM_USBH_PipeTransfer</a>.
 137 <a href="#details">More...</a></p>
 138 <table class="memberdecls">
 139 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="define-members" name="define-members"></a>
 140 Macros</h2></td></tr>
 141 <tr class="memitem:gafb0bcfee8abd4ada7f789aec2993048a"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__USBH__packets.html#gafb0bcfee8abd4ada7f789aec2993048a">ARM_USBH_PACKET_SETUP</a>&#160;&#160;&#160;(0x01UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a8139a9c76ea4a062795130196d3b6ed9">ARM_USBH_PACKET_TOKEN_Pos</a>)</td></tr>
 142 <tr class="memdesc:gafb0bcfee8abd4ada7f789aec2993048a"><td class="mdescLeft">&#160;</td><td class="mdescRight">SETUP Packet.  <br /></td></tr>
 143 <tr class="separator:gafb0bcfee8abd4ada7f789aec2993048a"><td class="memSeparator" colspan="2">&#160;</td></tr>
 144 <tr class="memitem:ga409b2ae6503e738eb86e35652f9ebf8d"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__USBH__packets.html#ga409b2ae6503e738eb86e35652f9ebf8d">ARM_USBH_PACKET_OUT</a>&#160;&#160;&#160;(0x02UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a8139a9c76ea4a062795130196d3b6ed9">ARM_USBH_PACKET_TOKEN_Pos</a>)</td></tr>
 145 <tr class="memdesc:ga409b2ae6503e738eb86e35652f9ebf8d"><td class="mdescLeft">&#160;</td><td class="mdescRight">OUT Packet.  <br /></td></tr>
 146 <tr class="separator:ga409b2ae6503e738eb86e35652f9ebf8d"><td class="memSeparator" colspan="2">&#160;</td></tr>
 147 <tr class="memitem:ga08d60ec20c091b5e7e252d137268cb76"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__USBH__packets.html#ga08d60ec20c091b5e7e252d137268cb76">ARM_USBH_PACKET_IN</a>&#160;&#160;&#160;(0x03UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a8139a9c76ea4a062795130196d3b6ed9">ARM_USBH_PACKET_TOKEN_Pos</a>)</td></tr>
 148 <tr class="memdesc:ga08d60ec20c091b5e7e252d137268cb76"><td class="mdescLeft">&#160;</td><td class="mdescRight">IN Packet.  <br /></td></tr>
 149 <tr class="separator:ga08d60ec20c091b5e7e252d137268cb76"><td class="memSeparator" colspan="2">&#160;</td></tr>
 150 <tr class="memitem:ga2eeab58cebb4556214c021ff02c36b16"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__USBH__packets.html#ga2eeab58cebb4556214c021ff02c36b16">ARM_USBH_PACKET_PING</a>&#160;&#160;&#160;(0x04UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a8139a9c76ea4a062795130196d3b6ed9">ARM_USBH_PACKET_TOKEN_Pos</a>)</td></tr>
 151 <tr class="memdesc:ga2eeab58cebb4556214c021ff02c36b16"><td class="mdescLeft">&#160;</td><td class="mdescRight">PING Packet.  <br /></td></tr>
 152 <tr class="separator:ga2eeab58cebb4556214c021ff02c36b16"><td class="memSeparator" colspan="2">&#160;</td></tr>
 153 <tr class="memitem:ga40075aa1d3eff6d4b94dfe28d7745873"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__USBH__packets.html#ga40075aa1d3eff6d4b94dfe28d7745873">ARM_USBH_PACKET_DATA0</a>&#160;&#160;&#160;(0x01UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a2b28435952abaeea6fd29480f10e56eb">ARM_USBH_PACKET_DATA_Pos</a>)</td></tr>
 154 <tr class="memdesc:ga40075aa1d3eff6d4b94dfe28d7745873"><td class="mdescLeft">&#160;</td><td class="mdescRight">DATA0 PID.  <br /></td></tr>
 155 <tr class="separator:ga40075aa1d3eff6d4b94dfe28d7745873"><td class="memSeparator" colspan="2">&#160;</td></tr>
 156 <tr class="memitem:ga34014ff212b26e3ee8c8670a180846e2"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__USBH__packets.html#ga34014ff212b26e3ee8c8670a180846e2">ARM_USBH_PACKET_DATA1</a>&#160;&#160;&#160;(0x02UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a2b28435952abaeea6fd29480f10e56eb">ARM_USBH_PACKET_DATA_Pos</a>)</td></tr>
 157 <tr class="memdesc:ga34014ff212b26e3ee8c8670a180846e2"><td class="mdescLeft">&#160;</td><td class="mdescRight">DATA1 PID.  <br /></td></tr>
 158 <tr class="separator:ga34014ff212b26e3ee8c8670a180846e2"><td class="memSeparator" colspan="2">&#160;</td></tr>
 159 <tr class="memitem:gaf47930d994c53fc1772caed129aee921"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__USBH__packets.html#gaf47930d994c53fc1772caed129aee921">ARM_USBH_PACKET_SSPLIT</a>&#160;&#160;&#160;(0x08UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a41e5706fcf6e028c5c86751b37a27dd6">ARM_USBH_PACKET_SPLIT_Pos</a>)</td></tr>
 160 <tr class="memdesc:gaf47930d994c53fc1772caed129aee921"><td class="mdescLeft">&#160;</td><td class="mdescRight">SSPLIT Packet.  <br /></td></tr>
 161 <tr class="separator:gaf47930d994c53fc1772caed129aee921"><td class="memSeparator" colspan="2">&#160;</td></tr>
 162 <tr class="memitem:ga3b8fa0d3aa083718b4f5d60e92394b47"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__USBH__packets.html#ga3b8fa0d3aa083718b4f5d60e92394b47">ARM_USBH_PACKET_SSPLIT_S</a>&#160;&#160;&#160;(0x09UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a41e5706fcf6e028c5c86751b37a27dd6">ARM_USBH_PACKET_SPLIT_Pos</a>)</td></tr>
 163 <tr class="memdesc:ga3b8fa0d3aa083718b4f5d60e92394b47"><td class="mdescLeft">&#160;</td><td class="mdescRight">SSPLIT Packet: Data Start.  <br /></td></tr>
 164 <tr class="separator:ga3b8fa0d3aa083718b4f5d60e92394b47"><td class="memSeparator" colspan="2">&#160;</td></tr>
 165 <tr class="memitem:gaf99ee84befc6522fef56b21df870df72"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__USBH__packets.html#gaf99ee84befc6522fef56b21df870df72">ARM_USBH_PACKET_SSPLIT_E</a>&#160;&#160;&#160;(0x0AUL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a41e5706fcf6e028c5c86751b37a27dd6">ARM_USBH_PACKET_SPLIT_Pos</a>)</td></tr>
 166 <tr class="memdesc:gaf99ee84befc6522fef56b21df870df72"><td class="mdescLeft">&#160;</td><td class="mdescRight">SSPLIT Packet: Data End.  <br /></td></tr>
 167 <tr class="separator:gaf99ee84befc6522fef56b21df870df72"><td class="memSeparator" colspan="2">&#160;</td></tr>
 168 <tr class="memitem:ga8d2b46fbc04d871abe0661f8acd18a94"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__USBH__packets.html#ga8d2b46fbc04d871abe0661f8acd18a94">ARM_USBH_PACKET_SSPLIT_S_E</a>&#160;&#160;&#160;(0x0BUL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a41e5706fcf6e028c5c86751b37a27dd6">ARM_USBH_PACKET_SPLIT_Pos</a>)</td></tr>
 169 <tr class="memdesc:ga8d2b46fbc04d871abe0661f8acd18a94"><td class="mdescLeft">&#160;</td><td class="mdescRight">SSPLIT Packet: Data All.  <br /></td></tr>
 170 <tr class="separator:ga8d2b46fbc04d871abe0661f8acd18a94"><td class="memSeparator" colspan="2">&#160;</td></tr>
 171 <tr class="memitem:gadbfbbf7b4709f3ee4c3610da8402cfec"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__USBH__packets.html#gadbfbbf7b4709f3ee4c3610da8402cfec">ARM_USBH_PACKET_CSPLIT</a>&#160;&#160;&#160;(0x0CUL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a41e5706fcf6e028c5c86751b37a27dd6">ARM_USBH_PACKET_SPLIT_Pos</a>)</td></tr>
 172 <tr class="memdesc:gadbfbbf7b4709f3ee4c3610da8402cfec"><td class="mdescLeft">&#160;</td><td class="mdescRight">CSPLIT Packet.  <br /></td></tr>
 173 <tr class="separator:gadbfbbf7b4709f3ee4c3610da8402cfec"><td class="memSeparator" colspan="2">&#160;</td></tr>
 174 <tr class="memitem:ga6dd82c7b96bc1339d725a6133a32a62f"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__USBH__packets.html#ga6dd82c7b96bc1339d725a6133a32a62f">ARM_USBH_PACKET_PRE</a>&#160;&#160;&#160;(1UL &lt;&lt; 12)</td></tr>
 175 <tr class="memdesc:ga6dd82c7b96bc1339d725a6133a32a62f"><td class="mdescLeft">&#160;</td><td class="mdescRight">PRE Token.  <br /></td></tr>
 176 <tr class="separator:ga6dd82c7b96bc1339d725a6133a32a62f"><td class="memSeparator" colspan="2">&#160;</td></tr>
 177 </table>
 178 <a name="details" id="details"></a><h2 class="groupheader">Description</h2>
 179 <p>Specify USB packet information used by the function <a class="el" href="group__usbh__host__gr.html#ga817d503a24ad8927fa362c8f6394920d">ARM_USBH_PipeTransfer</a>. </p>
 180 <p>This section provides the packet information values (parameter <em>packet</em>) for the <a class="el" href="group__usbh__host__gr.html#ga817d503a24ad8927fa362c8f6394920d">ARM_USBH_PipeTransfer</a> function.</p>
 181 <p>The following values are defined: </p>
 182 <h2 class="groupheader">Macro Definition Documentation</h2>
 183 <a id="gafb0bcfee8abd4ada7f789aec2993048a" name="gafb0bcfee8abd4ada7f789aec2993048a"></a>
 184 <h2 class="memtitle"><span class="permalink"><a href="#gafb0bcfee8abd4ada7f789aec2993048a">&#9670;&#160;</a></span>ARM_USBH_PACKET_SETUP</h2>
 185
 186 <div class="memitem">
 187 <div class="memproto">
 188       <table class="memname">
 189         <tr>
 190           <td class="memname">#define ARM_USBH_PACKET_SETUP&#160;&#160;&#160;(0x01UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a8139a9c76ea4a062795130196d3b6ed9">ARM_USBH_PACKET_TOKEN_Pos</a>)</td>
 191         </tr>
 192       </table>
 193 </div><div class="memdoc">
 194
 195 <p>SETUP Packet. </p>
 196 <p>Generate SETUP transaction. </p>
 197
 198 </div>
 199 </div>
 200 <a id="ga409b2ae6503e738eb86e35652f9ebf8d" name="ga409b2ae6503e738eb86e35652f9ebf8d"></a>
 201 <h2 class="memtitle"><span class="permalink"><a href="#ga409b2ae6503e738eb86e35652f9ebf8d">&#9670;&#160;</a></span>ARM_USBH_PACKET_OUT</h2>
 202
 203 <div class="memitem">
 204 <div class="memproto">
 205       <table class="memname">
 206         <tr>
 207           <td class="memname">#define ARM_USBH_PACKET_OUT&#160;&#160;&#160;(0x02UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a8139a9c76ea4a062795130196d3b6ed9">ARM_USBH_PACKET_TOKEN_Pos</a>)</td>
 208         </tr>
 209       </table>
 210 </div><div class="memdoc">
 211
 212 <p>OUT Packet. </p>
 213 <p>Generate OUT transaction. </p>
 214
 215 </div>
 216 </div>
 217 <a id="ga08d60ec20c091b5e7e252d137268cb76" name="ga08d60ec20c091b5e7e252d137268cb76"></a>
 218 <h2 class="memtitle"><span class="permalink"><a href="#ga08d60ec20c091b5e7e252d137268cb76">&#9670;&#160;</a></span>ARM_USBH_PACKET_IN</h2>
 219
 220 <div class="memitem">
 221 <div class="memproto">
 222       <table class="memname">
 223         <tr>
 224           <td class="memname">#define ARM_USBH_PACKET_IN&#160;&#160;&#160;(0x03UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a8139a9c76ea4a062795130196d3b6ed9">ARM_USBH_PACKET_TOKEN_Pos</a>)</td>
 225         </tr>
 226       </table>
 227 </div><div class="memdoc">
 228
 229 <p>IN Packet. </p>
 230 <p>Generate IN transaction. </p>
 231
 232 </div>
 233 </div>
 234 <a id="ga2eeab58cebb4556214c021ff02c36b16" name="ga2eeab58cebb4556214c021ff02c36b16"></a>
 235 <h2 class="memtitle"><span class="permalink"><a href="#ga2eeab58cebb4556214c021ff02c36b16">&#9670;&#160;</a></span>ARM_USBH_PACKET_PING</h2>
 236
 237 <div class="memitem">
 238 <div class="memproto">
 239       <table class="memname">
 240         <tr>
 241           <td class="memname">#define ARM_USBH_PACKET_PING&#160;&#160;&#160;(0x04UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a8139a9c76ea4a062795130196d3b6ed9">ARM_USBH_PACKET_TOKEN_Pos</a>)</td>
 242         </tr>
 243       </table>
 244 </div><div class="memdoc">
 245
 246 <p>PING Packet. </p>
 247 <p>Generate PING transaction (no data packet). </p>
 248
 249 </div>
 250 </div>
 251 <a id="ga40075aa1d3eff6d4b94dfe28d7745873" name="ga40075aa1d3eff6d4b94dfe28d7745873"></a>
 252 <h2 class="memtitle"><span class="permalink"><a href="#ga40075aa1d3eff6d4b94dfe28d7745873">&#9670;&#160;</a></span>ARM_USBH_PACKET_DATA0</h2>
 253
 254 <div class="memitem">
 255 <div class="memproto">
 256       <table class="memname">
 257         <tr>
 258           <td class="memname">#define ARM_USBH_PACKET_DATA0&#160;&#160;&#160;(0x01UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a2b28435952abaeea6fd29480f10e56eb">ARM_USBH_PACKET_DATA_Pos</a>)</td>
 259         </tr>
 260       </table>
 261 </div><div class="memdoc">
 262
 263 <p>DATA0 PID. </p>
 264 <p>Force DATA0 PID (Packet Identifier) for the initial data packet. When not specified than the driver provides the initial value according to the current state. </p>
 265
 266 </div>
 267 </div>
 268 <a id="ga34014ff212b26e3ee8c8670a180846e2" name="ga34014ff212b26e3ee8c8670a180846e2"></a>
 269 <h2 class="memtitle"><span class="permalink"><a href="#ga34014ff212b26e3ee8c8670a180846e2">&#9670;&#160;</a></span>ARM_USBH_PACKET_DATA1</h2>
 270
 271 <div class="memitem">
 272 <div class="memproto">
 273       <table class="memname">
 274         <tr>
 275           <td class="memname">#define ARM_USBH_PACKET_DATA1&#160;&#160;&#160;(0x02UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a2b28435952abaeea6fd29480f10e56eb">ARM_USBH_PACKET_DATA_Pos</a>)</td>
 276         </tr>
 277       </table>
 278 </div><div class="memdoc">
 279
 280 <p>DATA1 PID. </p>
 281 <p>Force DATA1 PID (Packet Identifier) for the initial data packet. When not specified than the driver provides the initial value according to the current state. </p>
 282
 283 </div>
 284 </div>
 285 <a id="gaf47930d994c53fc1772caed129aee921" name="gaf47930d994c53fc1772caed129aee921"></a>
 286 <h2 class="memtitle"><span class="permalink"><a href="#gaf47930d994c53fc1772caed129aee921">&#9670;&#160;</a></span>ARM_USBH_PACKET_SSPLIT</h2>
 287
 288 <div class="memitem">
 289 <div class="memproto">
 290       <table class="memname">
 291         <tr>
 292           <td class="memname">#define ARM_USBH_PACKET_SSPLIT&#160;&#160;&#160;(0x08UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a41e5706fcf6e028c5c86751b37a27dd6">ARM_USBH_PACKET_SPLIT_Pos</a>)</td>
 293         </tr>
 294       </table>
 295 </div><div class="memdoc">
 296
 297 <p>SSPLIT Packet. </p>
 298 <p>Used when driver does not support automatic handling of SPLIT packets and indicates Start-Split packet. For isochronous OUT it indicates that the High-speed data is in the middle of the Full-speed data payload. </p>
 299
 300 </div>
 301 </div>
 302 <a id="ga3b8fa0d3aa083718b4f5d60e92394b47" name="ga3b8fa0d3aa083718b4f5d60e92394b47"></a>
 303 <h2 class="memtitle"><span class="permalink"><a href="#ga3b8fa0d3aa083718b4f5d60e92394b47">&#9670;&#160;</a></span>ARM_USBH_PACKET_SSPLIT_S</h2>
 304
 305 <div class="memitem">
 306 <div class="memproto">
 307       <table class="memname">
 308         <tr>
 309           <td class="memname">#define ARM_USBH_PACKET_SSPLIT_S&#160;&#160;&#160;(0x09UL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a41e5706fcf6e028c5c86751b37a27dd6">ARM_USBH_PACKET_SPLIT_Pos</a>)</td>
 310         </tr>
 311       </table>
 312 </div><div class="memdoc">
 313
 314 <p>SSPLIT Packet: Data Start. </p>
 315 <p>Used when driver does not support automatic handling of SPLIT packets and indicates Start-Split packet. Valid only for isochronous OUT and indicates that the High-speed data is the start of the Full-speed data payload. </p>
 316
 317 </div>
 318 </div>
 319 <a id="gaf99ee84befc6522fef56b21df870df72" name="gaf99ee84befc6522fef56b21df870df72"></a>
 320 <h2 class="memtitle"><span class="permalink"><a href="#gaf99ee84befc6522fef56b21df870df72">&#9670;&#160;</a></span>ARM_USBH_PACKET_SSPLIT_E</h2>
 321
 322 <div class="memitem">
 323 <div class="memproto">
 324       <table class="memname">
 325         <tr>
 326           <td class="memname">#define ARM_USBH_PACKET_SSPLIT_E&#160;&#160;&#160;(0x0AUL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a41e5706fcf6e028c5c86751b37a27dd6">ARM_USBH_PACKET_SPLIT_Pos</a>)</td>
 327         </tr>
 328       </table>
 329 </div><div class="memdoc">
 330
 331 <p>SSPLIT Packet: Data End. </p>
 332 <p>Used when driver does not support automatic handling of SPLIT packets and indicates Start-Split packet. Valid only for isochronous OUT and indicates that the High-speed data is the end of the Full-speed data payload. </p>
 333
 334 </div>
 335 </div>
 336 <a id="ga8d2b46fbc04d871abe0661f8acd18a94" name="ga8d2b46fbc04d871abe0661f8acd18a94"></a>
 337 <h2 class="memtitle"><span class="permalink"><a href="#ga8d2b46fbc04d871abe0661f8acd18a94">&#9670;&#160;</a></span>ARM_USBH_PACKET_SSPLIT_S_E</h2>
 338
 339 <div class="memitem">
 340 <div class="memproto">
 341       <table class="memname">
 342         <tr>
 343           <td class="memname">#define ARM_USBH_PACKET_SSPLIT_S_E&#160;&#160;&#160;(0x0BUL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a41e5706fcf6e028c5c86751b37a27dd6">ARM_USBH_PACKET_SPLIT_Pos</a>)</td>
 344         </tr>
 345       </table>
 346 </div><div class="memdoc">
 347
 348 <p>SSPLIT Packet: Data All. </p>
 349 <p>Used when driver does not support automatic handling of SPLIT packets and indicates Start-Split packet. Valid only for isochronous OUT and indicates that the High-speed data is all of the Full-speed data payload. </p>
 350
 351 </div>
 352 </div>
 353 <a id="gadbfbbf7b4709f3ee4c3610da8402cfec" name="gadbfbbf7b4709f3ee4c3610da8402cfec"></a>
 354 <h2 class="memtitle"><span class="permalink"><a href="#gadbfbbf7b4709f3ee4c3610da8402cfec">&#9670;&#160;</a></span>ARM_USBH_PACKET_CSPLIT</h2>
 355
 356 <div class="memitem">
 357 <div class="memproto">
 358       <table class="memname">
 359         <tr>
 360           <td class="memname">#define ARM_USBH_PACKET_CSPLIT&#160;&#160;&#160;(0x0CUL &lt;&lt; <a class="el" href="Driver__USBH_8h.html#a41e5706fcf6e028c5c86751b37a27dd6">ARM_USBH_PACKET_SPLIT_Pos</a>)</td>
 361         </tr>
 362       </table>
 363 </div><div class="memdoc">
 364
 365 <p>CSPLIT Packet. </p>
 366 <p>Used when driver does not support automatic handling of SPLIT packets and indicates Complete-Split packet. </p>
 367
 368 </div>
 369 </div>
 370 <a id="ga6dd82c7b96bc1339d725a6133a32a62f" name="ga6dd82c7b96bc1339d725a6133a32a62f"></a>
 371 <h2 class="memtitle"><span class="permalink"><a href="#ga6dd82c7b96bc1339d725a6133a32a62f">&#9670;&#160;</a></span>ARM_USBH_PACKET_PRE</h2>
 372
 373 <div class="memitem">
 374 <div class="memproto">
 375       <table class="memname">
 376         <tr>
 377           <td class="memname">#define ARM_USBH_PACKET_PRE&#160;&#160;&#160;(1UL &lt;&lt; 12)</td>
 378         </tr>
 379       </table>
 380 </div><div class="memdoc">
 381
 382 <p>PRE Token. </p>
 383 <p>Generate PRE (Preamble) for low-speed devices within a full/low-speed signaling environment. </p>
 384
 385 </div>
 386 </div>
 387 </div><!-- contents -->
 388 </div><!-- doc-content -->
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