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<div class="title">Synchronous vs. Asynchronous Results </div> </div>
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<div class="textblock"><p>The UNICENS library distinguishes between <em>synchronous</em> and <em>asynchronous</em> returned results.</p>
<h1>Synchronous Results</h1>
<p>If a UNICENS API function detects an error the error is returned synchronously. For this purpose enumeration <a class="el" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_ga886138f5d13e84ffaa3df5769830e1cd.html#ga886138f5d13e84ffaa3df5769830e1cd">Ucs_Return_t</a> is used. If no error has occurred <a class="el" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_ga886138f5d13e84ffaa3df5769830e1cd.html#gga886138f5d13e84ffaa3df5769830e1cda3fb51656e17ee4802f23706f35e349bc">UCS_RET_SUCCESS</a> is returned.</p>
<p><b>Example:</b> </p>
<div class="fragment"><div class="line"><a class="code" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_ga886138f5d13e84ffaa3df5769830e1cd.html#ga886138f5d13e84ffaa3df5769830e1cd" title="Standard return codes used for synchronous response.">Ucs_Return_t</a> ret = <a class="code" href="group___g___u_c_s___n_e_t_ga83c2e74a4cc216aa10d7c6a1a517d459.html#ga83c2e74a4cc216aa10d7c6a1a517d459" title="Starts up the MOST Network.">Ucs_Network_Startup</a>(ucs_inst_ptr, 52U, 0xFFFFU, my_result_fptr);</div>
</div><!-- fragment --><h1>Asynchronous Results</h1>
<p>The communication between the EHC and the INIC is an asynchronous process. If the EHC calls an INIC function the returned result is received asynchronously. Thus, most of the UNICENS API functions provide callback function pointers to receive INIC results/errors.</p>
<h2>INIC Errors</h2>
<p>If the INIC returns an error, this information is mapped to a UNICENS standard result structure <a class="el" href="struct_ucs___std_result__t.html">Ucs_StdResult_t</a>.</p>
<div class="fragment"><div class="line"><span class="keyword">typedef</span> <span class="keyword">struct</span></div>
<div class="line">{</div>
<div class="line"> <a class="code" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_gac844b77cf41aef663782bc0b43d3540c.html#gac844b77cf41aef663782bc0b43d3540c" title="Result codes used for asynchronous response.">Ucs_Result_t</a> code; <span class="comment">/* Result/Error code */</span></div>
<div class="line"> uint8_t *info_ptr; <span class="comment">/* INIC error data */</span></div>
<div class="line"> uint8_t size; <span class="comment">/* Size of the INIC error data in bytes */</span></div>
<div class="line"></div>
<div class="line">} <a class="code" href="struct_ucs___std_result__t.html" title="Standard result structure which provides fields for detailed status and error information.">Ucs_StdResult_t</a>;</div>
</div><!-- fragment --><p>The result codes are based on the INIC error codes and UNICENS specific result codes. The mapping of the INIC and the UNICENS codes are shown in the table below.</p>
<table class="doxtable">
<tr>
<th>UNICENS Result Code </th><th style="text-align:center;">INIC Error Code </th><th>Description </th></tr>
<tr>
<td><a class="el" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_gac844b77cf41aef663782bc0b43d3540c.html#ggac844b77cf41aef663782bc0b43d3540cae19d5a51de78bbf903a108a4e36a0fdf">UCS_RES_SUCCESS</a> </td><td style="text-align:center;">- </td><td>Operation succeed, no error occurred </td></tr>
<tr>
<td rowspan="7"><a class="el" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_gac844b77cf41aef663782bc0b43d3540c.html#ggac844b77cf41aef663782bc0b43d3540ca4f4226f6e507caf5a9e044759c6409cf">UCS_RES_ERR_MOST_STANDARD</a> </td><td style="text-align:center;">0x01 </td><td>FBlock ID not available </td></tr>
<tr>
<td style="text-align:center;">0x02 </td><td>Instance ID not available </td></tr>
<tr>
<td style="text-align:center;">0x03 </td><td>Function ID not available </td></tr>
<tr>
<td style="text-align:center;">0x04 </td><td>OP-Type not available </td></tr>
<tr>
<td style="text-align:center;">0x05 </td><td>Invalid length </td></tr>
<tr>
<td style="text-align:center;">0x06 </td><td>Parameter wrong/out of range </td></tr>
<tr>
<td style="text-align:center;">0x0C </td><td>Segmentation error </td></tr>
<tr>
<td><a class="el" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_gac844b77cf41aef663782bc0b43d3540c.html#ggac844b77cf41aef663782bc0b43d3540ca8ff50e770356e4fca8d36a308e323d83">UCS_RES_ERR_BUSY</a> </td><td rowspan="4" style="text-align:center;">0x20 </td><td>INIC function specific error with error class "Busy (0x01)".<br/>
Process in INIC is currently busy. Retries are possible in a reasonable time. </td></tr>
<tr>
<td><a class="el" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_gac844b77cf41aef663782bc0b43d3540c.html#ggac844b77cf41aef663782bc0b43d3540caa7f09aea37cedd8dfbe3665781aae6aa">UCS_RES_ERR_PROCESSING</a> </td><td>INIC function specific error with error class "Processing (0x02)".<br/>
Process could not be finished. Retries are possible. </td></tr>
<tr>
<td><a class="el" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_gac844b77cf41aef663782bc0b43d3540c.html#ggac844b77cf41aef663782bc0b43d3540caa142d5f1f196cbf759f2cbd6d8a7468a">UCS_RES_ERR_CONFIGURATION</a> </td><td>INIC function specific error with error class "Configuration (0x03)".<br/>
Wrong configuration (values are temporarily out of range). Retries are not useful. </td></tr>
<tr>
<td><a class="el" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_gac844b77cf41aef663782bc0b43d3540c.html#ggac844b77cf41aef663782bc0b43d3540cae64970c5c3ad3d0dc6996b77cd528dbb">UCS_RES_ERR_SYSTEM</a> </td><td>INIC function specific error with error class "System (0x04)".<br/>
Current state of INIC or network prevents a successful execution of the process and retries are not possible. Retries are only possible when the state changes, but it is not clear when or if this happens (dynamic error). </td></tr>
<tr>
<td><a class="el" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_gac844b77cf41aef663782bc0b43d3540c.html#ggac844b77cf41aef663782bc0b43d3540ca3099d31f6d533972cf96c86dca0b0cc7">UCS_RES_ERR_TIMEOUT</a> </td><td style="text-align:center;">- </td><td>Timeout during operation </td></tr>
<tr>
<td><a class="el" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_gac844b77cf41aef663782bc0b43d3540c.html#ggac844b77cf41aef663782bc0b43d3540ca4e2229e49fe1197dd9df919719fcd38a">UCS_RES_ERR_TRANSMISSION</a> </td><td style="text-align:center;">- </td><td>Transmission error occurred on the MOST network </td></tr>
</table>
<h3>Detailed Error Information</h3>
<p>If one of the errors above occurs, the raw INIC error data is stored in a byte stream referenced by pointer <code>info_ptr</code>. Parameter <code>size</code> represents the size of the INIC error data in bytes.</p>
<p><b>Example:</b><br/>
The INIC returns the following error:</p>
<ul>
<li>Error Code: 0x20</li>
<li>Error Class: 0x03</li>
<li>Error ID: 0x32</li>
<li>Addition Parameter: 0x4711</li>
</ul>
<p>The information is stored in variable <code>my_result</code> which is from type <a class="el" href="struct_ucs___std_result__t.html" title="Standard result structure which provides fields for detailed status and error information.">Ucs_StdResult_t</a>:</p>
<ul>
<li><code>my_result.code: UCS_RES_ERR_CONFIGURATION</code></li>
<li><code>my_result.info_ptr[0]: 0x20</code></li>
<li><code>my_result.info_ptr[1]: 0x03</code></li>
<li><code>my_result.info_ptr[2]: 0x32</code></li>
<li><code>my_result.info_ptr[3]: 0x47</code></li>
<li><code>my_result.info_ptr[4]: 0x11</code></li>
<li><code>my_result.size: 5</code> </li>
</ul>
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