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 131 <a href="#define-members">Macros</a>  </div>
 132   <div class="headertitle"><div class="title">Peripheral Access</div></div>
 133 </div><!--header-->
 134 <div class="contents">
 135
 136 <p>Naming conventions and optional features for accessing peripherals.
 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:ga286e3b913dbd236c7f48ea70c8821f4e"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__peripheral__gr.html#ga286e3b913dbd236c7f48ea70c8821f4e">_VAL2FLD</a>(field,  value)</td></tr>
 142 <tr class="memdesc:ga286e3b913dbd236c7f48ea70c8821f4e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Mask and shift a bit field value for assigning the result to a peripheral register.  <br /></td></tr>
 143 <tr class="separator:ga286e3b913dbd236c7f48ea70c8821f4e"><td class="memSeparator" colspan="2">&#160;</td></tr>
 144 <tr class="memitem:ga139b6e261c981f014f386927ca4a8444"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__peripheral__gr.html#ga139b6e261c981f014f386927ca4a8444">_FLD2VAL</a>(field,  value)</td></tr>
 145 <tr class="memdesc:ga139b6e261c981f014f386927ca4a8444"><td class="mdescLeft">&#160;</td><td class="mdescRight">Extract from a peripheral register value the a bit field value.  <br /></td></tr>
 146 <tr class="separator:ga139b6e261c981f014f386927ca4a8444"><td class="memSeparator" colspan="2">&#160;</td></tr>
 147 </table>
 148 <a name="details" id="details"></a><h2 class="groupheader">Description</h2>
 149 <p>The section below describes the naming conventions, requirements, and optional features for accessing device specific peripherals. Most of the rules also apply to the core peripherals. The <a class="el" href="device_h_pg.html">Device Header File &lt;device.h&gt;</a> contains typically these definition and also includes the core specific header files.</p>
 150 <p>The definitions for <a class="el" href="group__peripheral__gr.html">Peripheral Access</a> can be generated using the <a href="../../SVD/html/index.html"><b>CMSIS-SVD</b></a> System View Description for Peripherals. Refer to <a href="../../SVD/html/svd_SVDConv_pg.html"><b>SVDConv.exe</b></a> for more information.</p>
 151 <p>Each peripheral provides a data type definition with a name that is composed of:</p><ul>
 152 <li>an optional prefix <b>&lt;<em>device abbreviation&gt;</em>_</b></li>
 153 <li><b>&lt;<em>peripheral name</em>&gt;</b></li>
 154 <li>postfix <b>_Type</b> or <b>_TypeDef</b> to identify a type definition.</li>
 155 </ul>
 156 <p>Examples:</p><ul>
 157 <li><b>UART_TypeDef</b> for the peripheral <b>UART</b>.</li>
 158 <li><b>IMX_UART_TypeDef</b> for the device family <b>IMX</b> and the peripheral <b>UART</b>.</li>
 159 </ul>
 160 <p>The data type definition uses standard C data types defined by the ANSI C header file &lt;stdint.h&gt;.</p>
 161 <ul>
 162 <li>IO Type Qualifiers are used to specify the access to peripheral variables. <table class="markdownTable">
 163 <tr class="markdownTableHead">
 164 <th class="markdownTableHeadLeft">IO Type Qualifier   </th><th class="markdownTableHeadLeft">Type   </th><th class="markdownTableHeadLeft">Description    </th></tr>
 165 <tr class="markdownTableRowOdd">
 166 <td class="markdownTableBodyLeft"><b>__IM</b>   </td><td class="markdownTableBodyLeft">Struct member   </td><td class="markdownTableBodyLeft">Defines 'read only' permissions    </td></tr>
 167 <tr class="markdownTableRowEven">
 168 <td class="markdownTableBodyLeft"><b>__OM</b>   </td><td class="markdownTableBodyLeft">Struct member   </td><td class="markdownTableBodyLeft">Defines 'write only' permissions    </td></tr>
 169 <tr class="markdownTableRowOdd">
 170 <td class="markdownTableBodyLeft"><b>__IOM</b>   </td><td class="markdownTableBodyLeft">Struct member   </td><td class="markdownTableBodyLeft">Defines 'read / write' permissions    </td></tr>
 171 <tr class="markdownTableRowEven">
 172 <td class="markdownTableBodyLeft"><b>__I</b>   </td><td class="markdownTableBodyLeft">Scalar variable   </td><td class="markdownTableBodyLeft">Defines 'read only' permissions    </td></tr>
 173 <tr class="markdownTableRowOdd">
 174 <td class="markdownTableBodyLeft"><b>__O</b>   </td><td class="markdownTableBodyLeft">Scalar variable   </td><td class="markdownTableBodyLeft">Defines 'write only' permissions    </td></tr>
 175 <tr class="markdownTableRowEven">
 176 <td class="markdownTableBodyLeft"><b>__IO</b>   </td><td class="markdownTableBodyLeft">Scalar variable   </td><td class="markdownTableBodyLeft">Defines 'read / write' permissions   </td></tr>
 177 </table>
 178 </li>
 179 </ul>
 180 <p>The typedef <b>&lt;<em>device abbreviation</em>&gt;_UART_TypeDef</b> shown below defines the generic register layout for all UART channels in a device.</p>
 181 <div class="fragment"><div class="line"><span class="keyword">typedef</span> <span class="keyword">struct </span>{</div>
 182 <div class="line">  __O  uint32_t UART_CR;            <span class="comment">// Offset: 0x0000 ( /W) Control Register </span></div>
 183 <div class="line">  __IO uint32_t UART_MR;            <span class="comment">// Offset: 0x0004 (R/W) Mode Register </span></div>
 184 <div class="line">  __O  uint32_t UART_IER;           <span class="comment">// Offset: 0x0008 ( /W) Interrupt Enable Register </span></div>
 185 <div class="line">  __O  uint32_t UART_IDR;           <span class="comment">// Offset: 0x000C ( /W) Interrupt Disable Register </span></div>
 186 <div class="line">  __I  uint32_t UART_IMR;           <span class="comment">// Offset: 0x0010 (R/ ) Interrupt Mask Register </span></div>
 187 <div class="line">  __I  uint32_t UART_SR;            <span class="comment">// Offset: 0x0014 (R/ ) Status Register </span></div>
 188 <div class="line">  __I  uint32_t UART_RHR;           <span class="comment">// Offset: 0x0018 (R/ ) Receive Holding Register </span></div>
 189 <div class="line">  __O  uint32_t UART_THR;           <span class="comment">// Offset: 0x001C ( /W) Transmit Holding Register </span></div>
 190 <div class="line">  __IO uint32_t UART_BRGR;          <span class="comment">// Offset: 0x0020 (R/W) Baud Rate Generator Register </span></div>
 191 <div class="line">  __IO uint32_t UART_CMPR;          <span class="comment">// Offset: 0x0024 (R/W) Comparison Register </span></div>
 192 <div class="line">  __IO uint32_t UART_RTOR;          <span class="comment">// Offset: 0x0028 (R/W) Receiver Time-out Register </span></div>
 193 <div class="line">  __I  uint32_t RESERVED[46];       <span class="comment">// Offset: 0x002C (R/ ) Reserved                     </span></div>
 194 <div class="line">  __IO uint32_t UART_WPMR;          <span class="comment">// Offset: 0x00E4 (R/W) Write Protection Mode Register </span></div>
 195 <div class="line">} IMX_UART_TypeDef;</div>
 196 </div><!-- fragment --><p>To access the registers of the UART defined above, pointers to this register structure are defined. If more instances of a peripheral exist, the variables have a postfix (digit or letter) that identifies the peripheral.</p>
 197 <p><b>Example:</b> In this example, <b>IMX_UART2</b> and <b>IMX_UART3</b> are two pointers to UARTs defined with above register structure. <br  />
 198 </p><div class="fragment"><div class="line"><span class="preprocessor">#define IMX_UART2   ((IMX_UART_TypeDef *) IMX_UART2_BASE)</span></div>
 199 <div class="line"><span class="preprocessor">#define IMX_UART3   ((IMX_UART_TypeDef *) IMX_UART3_BASE)</span></div>
 200 </div><!-- fragment --><dl class="section note"><dt>Note</dt><dd><ul>
 201 <li>The prefix <b>IMX</b> is optional.</li>
 202 </ul>
 203 </dd></dl>
 204 <p>The registers in the various UARTs can now be referred in the user code as shown below:<br  />
 205 </p><div class="fragment"><div class="line">val = IMX_UART2-&gt;SR   <span class="comment">// is the Status Register of UART2.</span></div>
 206 </div><!-- fragment --><hr  />
 207 <h1><a class="anchor" id="core_cmsis_pal_min_reqs"></a>
 208 Minimal Requirements</h1>
 209 <p>To access the peripheral registers and related function in a device, the files <b><em>device.h</em></b> and <b>core_ca.h</b> define as a minimum: <br  />
 210 <br  />
 211 </p><ul>
 212 <li>The <b>Register Layout Typedef</b> for each peripheral that defines all register names. RESERVED is used to introduce space into the structure for adjusting the addresses of the peripheral registers. <br  />
 213 <br  />
 214 <b>Example:</b> <div class="fragment"><div class="line"><span class="keyword">typedef</span> <span class="keyword">struct</span></div>
 215 <div class="line">{</div>
 216 <div class="line">  __IOM uint32_t C_CTLR;              <span class="comment">// Offset: 0x0000 (R/W) CPU Interface Control Register </span></div>
 217 <div class="line">  __IOM uint32_t C_PMR;               <span class="comment">// Offset: 0x0004 (R/W) Interrupt Priority Mask Register </span></div>
 218 <div class="line">  __IOM uint32_t C_BPR;               <span class="comment">// Offset: 0x0008 (R/W) Binary Point Register </span></div>
 219 <div class="line">  __IM  uint32_t C_IAR;               <span class="comment">// Offset: 0x000C (R/ ) Interrupt Acknowledge Register </span></div>
 220 <div class="line">  __OM  uint32_t C_EOIR;              <span class="comment">// Offset: 0x0010 ( /W) End Of Interrupt Register </span></div>
 221 <div class="line">  __IM  uint32_t C_RPR;               <span class="comment">// Offset: 0x0014 (R/ ) Running Priority Register </span></div>
 222 <div class="line">  __IM  uint32_t C_HPPIR;             <span class="comment">// Offset: 0x0018 (R/ ) Highest Priority Pending Interrupt Register </span></div>
 223 <div class="line">  __IOM uint32_t C_ABPR;              <span class="comment">// Offset: 0x001C (R/W) Aliased Binary Point Register </span></div>
 224 <div class="line">  __IM  uint32_t C_AIAR;              <span class="comment">// Offset: 0x0020 (R/ ) Aliased Interrupt Acknowledge Register </span></div>
 225 <div class="line">  __OM  uint32_t C_AEOIR;             <span class="comment">// Offset: 0x0024 ( /W) Aliased End Of Interrupt Register </span></div>
 226 <div class="line">  __IM  uint32_t C_AHPPIR;            <span class="comment">// Offset: 0x0028 (R/ ) Aliased Highest Priority Pending Interrupt Register </span></div>
 227 <div class="line">  __IOM uint32_t C_STATUSR;           <span class="comment">// Offset: 0x002C (R/W) Error Reporting Status Register, optional </span></div>
 228 <div class="line">  __I   uint32_t RESERVED1[40];       <span class="comment">// Offset: 0x0030 (R/ ) Reserved</span></div>
 229 <div class="line">  __IOM uint32_t C_APR[4];            <span class="comment">// Offset: 0x00D0 (R/W) Active Priority Register </span></div>
 230 <div class="line">  __IOM uint32_t C_NSAPR[4];          <span class="comment">// Offset: 0x00E0 (R/W) Non-secure Active Priority Register </span></div>
 231 <div class="line">  __I   uint32_t RESERVED2[3];        <span class="comment">// Offset: 0x00F6 (R/ ) Reserved</span></div>
 232 <div class="line">  __IM  uint32_t C_IIDR;              <span class="comment">// Offset: 0x00FC (R/ ) CPU Interface Identification Register </span></div>
 233 <div class="line">  __I   uint32_t RESERVED3[960];      <span class="comment">// Offset: 0x0100 (R/ ) Reserved</span></div>
 234 <div class="line">  __OM  uint32_t C_DIR;               <span class="comment">// Offset: 0x1000 ( /W) Deactivate Interrupt Register </span></div>
 235 <div class="line">}  <a class="code hl_struct" href="structGICInterface__Type.html">GICInterface_Type</a>;</div>
 236 <div class="ttc" id="astructGICInterface__Type_html"><div class="ttname"><a href="structGICInterface__Type.html">GICInterface_Type</a></div></div>
 237 </div><!-- fragment --></li>
 238 <li><b>Base Address</b> for each peripheral (in case of multiple peripherals that use the same <b>register layout typedef</b> multiple base addresses are defined). <br  />
 239 <br  />
 240 <b>Example:</b> <div class="fragment"><div class="line"><span class="preprocessor">#define GIC_INTERFACE_BASE (0xe8202000UL)   </span><span class="comment">// GIC Interface Base Address     </span></div>
 241 </div><!-- fragment --></li>
 242 <li><b>Access Definitions</b> for each peripheral. In case of multiple peripherals that are using the same <b>register layout typedef</b>, multiple access definitions exist. <br  />
 243 <br  />
 244 <b>Example:</b> <div class="fragment"><div class="line"><span class="preprocessor">#define GICInterface   ((GICInterface_Type *) GIC_INTERFACE_BASE)   </span><span class="comment">// GIC Interface Access Definition </span></div>
 245 </div><!-- fragment --></li>
 246 </ul>
 247 <p>These definitions allow accessing peripheral registers with simple assignments.</p>
 248 <ul>
 249 <li><b>Example:</b> <br  />
 250 <div class="fragment"><div class="line">GICInterface-&gt;C_CTLR |= 1;   <span class="comment">// Enable Interface</span></div>
 251 </div><!-- fragment --></li>
 252 </ul>
 253 <hr  />
 254 <h1><a class="anchor" id="core_cmsis_pal_opts"></a>
 255 Optional Features</h1>
 256 <p>Optionally, the file <b><em>device</em>.h</b> may define:</p>
 257 <ul>
 258 <li><a class="el" href="group__peripheral__gr.html#core_cmsis_pal_bitfields">Register Bit Fields</a> and #define constants that simplify access to peripheral registers. These constants may define bit-positions or other specific patterns that are required for programming peripheral registers. The identifiers should start with <b>&lt;<em>device abbreviation</em>&gt;_</b> and <b>&lt;<em>peripheral name</em>&gt;_</b>. It is recommended to use CAPITAL letters for #define constants.</li>
 259 <li>More complex functions (i.e. status query before a sending register is accessed). Again, these functions start with <b>&lt;<em>device abbreviation</em>&gt;_</b> and <b>&lt;<em>peripheral name</em>&gt;_</b>.</li>
 260 </ul>
 261 <hr  />
 262 <h1><a class="anchor" id="core_cmsis_pal_bitfields"></a>
 263 Register Bit Fields</h1>
 264 <p>For Core Register, macros define the position and the mask value for a bit field.</p>
 265 <p><b>Example:</b></p>
 266 <p>Bit field definitions for register ACTLR in CP15.</p>
 267 <div class="fragment"><div class="line"><span class="comment">// CP15 Register ACTLR</span></div>
 268 <div class="line"><span class="preprocessor">#define ACTLR_DDI_Pos                  28U                       </span></div>
 269 <div class="line"><span class="preprocessor">#define ACTLR_DDI_Msk                  (1UL &lt;&lt; ACTLR_DDI_Pos)    </span></div>
 270 <div class="line">                                       </div>
 271 <div class="line"><span class="preprocessor">#define ACTLR_DDVM_Pos                 15U                       </span></div>
 272 <div class="line"><span class="preprocessor">#define ACTLR_DDVM_Msk                 (1UL &lt;&lt; ACTLR_DDVM_Pos)   </span></div>
 273 <div class="line">                                       </div>
 274 <div class="line"><span class="preprocessor">#define ACTLR_L1PCTL_Pos               13U                       </span></div>
 275 <div class="line"><span class="preprocessor">#define ACTLR_L1PCTL_Msk               (3UL &lt;&lt; ACTLR_L1PCTL_Pos) </span></div>
 276 <div class="line">                                       </div>
 277 <div class="line"><span class="preprocessor">#define ACTLR_L1RADIS_Pos              12U                       </span></div>
 278 <div class="line"><span class="preprocessor">#define ACTLR_L1RADIS_Msk              (1UL &lt;&lt; ACTLR_L1RADIS_Pos)</span></div>
 279 <div class="line">                                       </div>
 280 <div class="line"><span class="preprocessor">#define ACTLR_L2RADIS_Pos              11U                       </span></div>
 281 <div class="line"><span class="preprocessor">#define ACTLR_L2RADIS_Msk              (1UL &lt;&lt; ACTLR_L2RADIS_Pos)</span></div>
 282 <div class="line">                                       </div>
 283 <div class="line"><span class="preprocessor">#define ACTLR_DODMBS_Pos               10U                       </span></div>
 284 <div class="line"><span class="preprocessor">#define ACTLR_DODMBS_Msk               (1UL &lt;&lt; ACTLR_DODMBS_Pos) </span></div>
 285 <div class="line">                                       </div>
 286 <div class="line"><span class="preprocessor">#define ACTLR_SMP_Pos                  6U                        </span></div>
 287 <div class="line"><span class="preprocessor">#define ACTLR_SMP_Msk                  (1UL &lt;&lt; ACTLR_SMP_Pos)     </span></div>
 288 </div><!-- fragment --><p>The macros <b><a class="el" href="group__peripheral__gr.html#ga286e3b913dbd236c7f48ea70c8821f4e" title="Mask and shift a bit field value for assigning the result to a peripheral register.">_VAL2FLD(field, value)</a></b> and <b><a class="el" href="group__peripheral__gr.html#ga139b6e261c981f014f386927ca4a8444" title="Extract from a peripheral register value the a bit field value.">_FLD2VAL(field, value)</a></b> enable access to bit fields. </p>
 289 <h2 class="groupheader">Macro Definition Documentation</h2>
 290 <a id="ga139b6e261c981f014f386927ca4a8444" name="ga139b6e261c981f014f386927ca4a8444"></a>
 291 <h2 class="memtitle"><span class="permalink"><a href="#ga139b6e261c981f014f386927ca4a8444">&#9670;&#160;</a></span>_FLD2VAL</h2>
 292
 293 <div class="memitem">
 294 <div class="memproto">
 295       <table class="memname">
 296         <tr>
 297           <td class="memname">#define _FLD2VAL</td>
 298           <td>(</td>
 299           <td class="paramtype">&#160;</td>
 300           <td class="paramname">field, </td>
 301         </tr>
 302         <tr>
 303           <td class="paramkey"></td>
 304           <td></td>
 305           <td class="paramtype">&#160;</td>
 306           <td class="paramname">value&#160;</td>
 307         </tr>
 308         <tr>
 309           <td></td>
 310           <td>)</td>
 311           <td></td><td></td>
 312         </tr>
 313       </table>
 314 </div><div class="memdoc">
 315 <dl class="params"><dt>Parameters</dt><dd>
 316   <table class="params">
 317     <tr><td class="paramname">field</td><td>name of bit field. </td></tr>
 318     <tr><td class="paramname">value</td><td>value of the register. This parameter is interpreted as an uint32_t type.</td></tr>
 319   </table>
 320   </dd>
 321 </dl>
 322 <p>The macro <a class="el" href="group__peripheral__gr.html#ga139b6e261c981f014f386927ca4a8444">_FLD2VAL</a> uses the #define's <em>_Pos</em> and <em>_Msk</em> of the related bit field to extract the value of a bit field from a register.</p>
 323 <p><b>Example:</b> </p><div class="fragment"><div class="line">i = <a class="code hl_define" href="group__peripheral__gr.html#ga139b6e261c981f014f386927ca4a8444">_FLD2VAL</a>(ACTLR_SMP, ACTLR);</div>
 324 <div class="ttc" id="agroup__peripheral__gr_html_ga139b6e261c981f014f386927ca4a8444"><div class="ttname"><a href="group__peripheral__gr.html#ga139b6e261c981f014f386927ca4a8444">_FLD2VAL</a></div><div class="ttdeci">#define _FLD2VAL(field, value)</div><div class="ttdoc">Extract from a peripheral register value the a bit field value.</div><div class="ttdef"><b>Definition:</b> core_ca.txt:229</div></div>
 325 </div><!-- fragment -->
 326 </div>
 327 </div>
 328 <a id="ga286e3b913dbd236c7f48ea70c8821f4e" name="ga286e3b913dbd236c7f48ea70c8821f4e"></a>
 329 <h2 class="memtitle"><span class="permalink"><a href="#ga286e3b913dbd236c7f48ea70c8821f4e">&#9670;&#160;</a></span>_VAL2FLD</h2>
 330
 331 <div class="memitem">
 332 <div class="memproto">
 333       <table class="memname">
 334         <tr>
 335           <td class="memname">#define _VAL2FLD</td>
 336           <td>(</td>
 337           <td class="paramtype">&#160;</td>
 338           <td class="paramname">field, </td>
 339         </tr>
 340         <tr>
 341           <td class="paramkey"></td>
 342           <td></td>
 343           <td class="paramtype">&#160;</td>
 344           <td class="paramname">value&#160;</td>
 345         </tr>
 346         <tr>
 347           <td></td>
 348           <td>)</td>
 349           <td></td><td></td>
 350         </tr>
 351       </table>
 352 </div><div class="memdoc">
 353 <dl class="params"><dt>Parameters</dt><dd>
 354   <table class="params">
 355     <tr><td class="paramname">field</td><td>name of bit field. </td></tr>
 356     <tr><td class="paramname">value</td><td>value for the bit field. This parameter is interpreted as an uint32_t type.</td></tr>
 357   </table>
 358   </dd>
 359 </dl>
 360 <p>The macro <a class="el" href="group__peripheral__gr.html#ga286e3b913dbd236c7f48ea70c8821f4e">_VAL2FLD</a> uses the #define's <em>_Pos</em> and <em>_Msk</em> of the related bit field to shift bit-field values for assigning to a register.</p>
 361 <p><b>Example:</b> </p><div class="fragment"><div class="line">ACTLR = <a class="code hl_define" href="group__peripheral__gr.html#ga286e3b913dbd236c7f48ea70c8821f4e">_VAL2FLD</a>(ACTLR_SMP, 0x1)</div>
 362 <div class="ttc" id="agroup__peripheral__gr_html_ga286e3b913dbd236c7f48ea70c8821f4e"><div class="ttname"><a href="group__peripheral__gr.html#ga286e3b913dbd236c7f48ea70c8821f4e">_VAL2FLD</a></div><div class="ttdeci">#define _VAL2FLD(field, value)</div><div class="ttdoc">Mask and shift a bit field value for assigning the result to a peripheral register.</div><div class="ttdef"><b>Definition:</b> core_ca.txt:212</div></div>
 363 </div><!-- fragment -->
 364 </div>
 365 </div>
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