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LP-EM-CC2340R5: LP-EM-CC2340R5:

WENHAO CHOU
Prodigy 20 points
Part Number: LP-EM-CC2340R5
Other Parts Discussed in Thread: CC2340R5, UNIFLASH

Hi, Sir,

   I have two CC2340R5 EVB and want to use the NESB command to implement the RF packet TX/RX. I check your example code in "nesb_ptx_handler.html" and "nesb_prx_handler.html" and fail to achieve it. 
When I set the "cmd.config.autoRetransmitMode = 0" I can use the "rfPlacketRx" to receive the NESB TX but fail on NESB RX sample code. Can you help me check it ?

EVB version: RevB/PG2.0
CCS: 12.3.0.00005.
Sample code:  rfPacketTx, rfPacketRx
Uniflash version: 8.3.0.4307 

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<div class="PageDoc"><div class="header">
  <div class="headertitle">
<div class="title">NESB PTX Command Handler </div>  </div>
</div><!--header-->
<div class="contents">
<div class="textblock"><h1><a class="anchor" id="autotoc_md44"></a>
Introduction</h1>
<p>A PTX device normally acts as the main transmitter in an NESB network. Depending on user configuration, the handler acts similarly to the Generic Tx Command handler, or it can add automatic retransmission of unacknowledged packets.</p>
<p>The following sections describe how the command can be configured and used, its life cycle, and how it fits into the <a class="el" href="_r_c_l_8h.html#struct_r_c_l" title="Global shared driver state.">RCL</a> architecture.</p>
<h1><a class="anchor" id="autotoc_md45"></a>
Usage</h1>
<p>In order to submit a PTX command, the following steps must have taken place:</p>
<ol type="1">
<li><a class="el" href="_r_c_l_8h.html#struct_r_c_l" title="Global shared driver state.">RCL</a> has been initialized (See <a class="el" href="_r_c_l_8h.html#a2fa1415c07a809621287abfc9b7f40f7" title="Initializes the RCL driver state.">RCL_init</a>) and a handle must exist (See <a class="el" href="_r_c_l_8h.html#ad250dbda0747820e489d38cdb268ecee" title="Initializes an RCL client instance.">RCL_open</a>).</li>
<li>The <a class="el" href="commands_2generic_8h.html#struct_r_c_l___c_m_d___n_e_s_b___p_t_x__t" title="NESB transmit command.">RCL_CMD_NESB_PTX_t</a> command has been initialized and configured.</li>
<li>The Tx buffer has been set up.</li>
<li>An RX buffer has been set up to receive the ACK (if configuration demands it).</li>
</ol>
<p>Once these steps have been completed, <a class="el" href="_r_c_l_8h.html#a335ebd06e9591a1a9ec26bde80199d96" title="Submit RCL command object to be scheduled for execution.">RCL_Command_submit</a> and <a class="el" href="_r_c_l_8h.html#adc809f6096147ac6e33641fb2161a859" title="Wait for a submitted command to complete.">RCL_Command_pend</a> are called to effectively send a packet and then wait for the command to conclude.</p>
<p>As with any command handler, the application must built packets so that they are compatible with the internal packet format used in the LRF. Having said this, NESB packets also have a specific packet format that needs to be considered at the application level.</p>
<p>This can be accomplished by using a struct to define the various fields that need to be considered when building or checking the content of the packet.</p>
<div class="fragment"><div class="line"><span class="preprocessor">#define PKT_LEN 200</span></div>
<div class="line"><span class="preprocessor">#define HDR_LEN 3</span></div>
<div class="line"><span class="preprocessor">#define NUM_PKT 4</span></div>
<div class="line"><span class="preprocessor">#define NUM_PAD 3</span></div>
<div class="line"><span class="preprocessor">#define NUM_RX_BUF 1</span></div>
<div class="line"><span class="preprocessor">#define MULTI_BUF_SZ 2048</span></div>
<div class="line"><span class="preprocessor">#define FREQUENCY 2470000000</span></div>
<div class="line"><span class="preprocessor">#define SYNCWORD 0xAB0B51DE</span></div>
<div class="line"><span class="preprocessor">#define NESB_ADDR 0xAC9825CB</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#define NESB_hdrDef_Default()   \</span></div>
<div class="line"><span class="preprocessor">{                               \</span></div>
<div class="line"><span class="preprocessor">    .numHdrBits = 11,           \</span></div>
<div class="line"><span class="preprocessor">    .numLenBits = 8,            \</span></div>
<div class="line"><span class="preprocessor">    .lenPos = 3,                \</span></div>
<div class="line"><span class="preprocessor">    .lenOffset = 0,             \</span></div>
<div class="line"><span class="preprocessor">    .numPad = 3,                \</span></div>
<div class="line"><span class="preprocessor">}</span></div>
<div class="line"><span class="preprocessor">#define NESB_hdrDef_DefaultRuntime() (ExampleRCL_NesbHdrDef) NESB_hdrDef_Default()</span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <span class="keyword">struct </span>{</div>
<div class="line">    uint8_t numHdrBits;</div>
<div class="line">    uint8_t numLenBits;</div>
<div class="line">    uint8_t lenPos;</div>
<div class="line">    int8_t lenOffset;</div>
<div class="line">    uint8_t numPad;</div>
<div class="line">} ExampleRCL_NesbHdrDef;</div>
</div><!-- fragment --><p> Taking this into consideration, packet generation needs to consider how the 11-bit header is placed in the LRF FIFO. the following function shows one way to accomplish this:</p>
<div class="fragment"><div class="line"><span class="keywordtype">void</span> generatePackets(RCL_Buffer_TxBuffer **txBuffers, uint32_t numPkt, uint32_t pktLen,</div>
<div class="line">                     ExampleRCL_NesbHdrDef *hdrDef, uint32_t address, uint32_t addressLen)</div>
<div class="line">{</div>
<div class="line">    <span class="keyword">union</span></div>
<div class="line">    {</div>
<div class="line">        uint32_t value;</div>
<div class="line">        uint8_t bytes[4];</div>
<div class="line">    } nesbAddress;</div>
<div class="line">    <span class="keyword">union</span></div>
<div class="line">    {</div>
<div class="line">        uint16_t value;</div>
<div class="line">        uint8_t bytes[2];</div>
<div class="line">    } nesbHeader;</div>
<div class="line"> </div>
<div class="line">    uint8_t hdrLen = (hdrDef-&gt;numHdrBits + 7) / 8;</div>
<div class="line">    uint8_t seqNum = 0; <span class="comment">// Start with a seq number equal to zero</span></div>
<div class="line">    uint8_t noAckBit = 0; <span class="comment">// Always set the noAckBit to zero</span></div>
<div class="line">    nesbAddress.value = address;</div>
<div class="line"> </div>
<div class="line">    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; numPkt; i++)</div>
<div class="line">    {</div>
<div class="line">        uint8_t *txData;</div>
<div class="line"> </div>
<div class="line">        <span class="comment">/* Initialize Tx Buffer */</span></div>
<div class="line">        txData = <a class="code" href="group__buffer_api_functions.html#ga6fc3e5a4bff33ded64a77ea203128805">RCL_TxBuffer_init</a>(txBuffers[i], hdrDef-&gt;numPad, hdrLen, pktLen);</div>
<div class="line"> </div>
<div class="line">        <span class="comment">/* Build the 11 bit NESB header */</span></div>
<div class="line">        nesbHeader.value = ((pktLen &lt;&lt; 3) | (seqNum &lt;&lt; 1) | noAckBit);</div>
<div class="line"> </div>
<div class="line">        <span class="comment">/* Write NESB header to buffer */</span></div>
<div class="line">        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; hdrLen; i++)</div>
<div class="line">        {</div>
<div class="line">            txData[i] = nesbHeader.bytes[i];</div>
<div class="line">        }</div>
<div class="line">        <span class="comment">/* Write NESB address to buffer. Address comes immediately after header */</span></div>
<div class="line">        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; addressLen; i++)</div>
<div class="line">        {</div>
<div class="line">            txData[hdrLen + i] = nesbAddress.bytes[i];</div>
<div class="line">        }</div>
<div class="line">        <span class="comment">/* Write the payload */</span></div>
<div class="line">        <span class="keywordflow">if</span>(pktLen &gt;= addressLen)</div>
<div class="line">        {</div>
<div class="line">            uint32_t payloadLength = pktLen - addressLen;</div>
<div class="line">            <span class="keywordflow">for</span>(uint32_t i = 0; i &lt; payloadLength; i++)</div>
<div class="line">            {</div>
<div class="line">                txData[hdrLen + addressLen + i] = i &amp; 0xFF;</div>
<div class="line">            }</div>
<div class="line">        }</div>
<div class="line">        <span class="comment">/* Update packet ID (seq number) for next packet */</span></div>
<div class="line">        seqNum = (seqNum + 1) % 4;</div>
<div class="line">    }</div>
<div class="line">}</div>
</div><!-- fragment --><p> Command configuration and submitting is similar to generic command handlers.</p>
<div class="fragment"><div class="line"><span class="keywordtype">void</span> runNesbPtx(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line">    ExampleRCL_NesbHdrDef hdrDef = NESB_hdrDef_DefaultRuntime();</div>
<div class="line">    List_List multiBuffers = { 0 };</div>
<div class="line">    uint32_t address = NESB_ADDR;</div>
<div class="line">    uint32_t addressLen = 4;</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Set up Tx and Rx buffers considering 4 packets, packet length of 200 bytes, 2 header bytes and 3 padding bytes */</span></div>
<div class="line">    RCL_Buffer_TxBuffer *txBuffers[NUM_PKT];</div>
<div class="line">    uint32_t pktBuffer[NUM_PKT][<a class="code" href="group__buffer_api_functions.html#gade3c0fd0ae25d389875981dac43d5f15">RCL_TxBuffer_len_u32</a>(NUM_PAD, HDR_LEN, PKT_LEN)];</div>
<div class="line">    uint32_t rxMultiBuffer[NUM_RX_BUF][MULTI_BUF_SZ / 4];</div>
<div class="line"> </div>
<div class="line">    <a class="code" href="_r_c_l_8c.html#a145b90e0682b0e3fd914772879861e44">RCL_init</a>();</div>
<div class="line">    RCL_Handle h = <a class="code" href="_r_c_l_8c.html#ad250dbda0747820e489d38cdb268ecee">RCL_open</a>(&amp;rclClient, &amp;LRF_configNesb);</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Declare command */</span></div>
<div class="line">    RCL_CmdNesbPtx cmd;</div>
<div class="line">    cmd = <a class="code" href="commands_2generic_8h.html#abf346875f81c8e9bbe0371a3e6cf9433">RCL_CmdNesbPtx_DefaultRuntime</a>();</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Command configuration */</span></div>
<div class="line">    cmd.common.scheduling = <a class="code" href="_r_c_l___command_8h.html#ade08c929505da062070474163417817da36e4eb855b1a8b435564f5911266a55b">RCL_Schedule_AbsTime</a>;</div>
<div class="line">    cmd.common.runtime.callback = defaultCallback;</div>
<div class="line">    cmd.common.runtime.rclCallbackMask.value = <a class="code" href="_r_c_l___event_8h.html#a9e6384116d9e2d84f36990827d6e86f1">RCL_EventLastCmdDone</a>.value | <a class="code" href="_r_c_l___event_8h.html#a27efe993ce19cd501e8aadb7c5fa4aee">RCL_EventRxEntryAvail</a>.value;</div>
<div class="line">    cmd.rfFrequency = FREQUENCY;</div>
<div class="line">    cmd.syncWord = SYNCWORD;</div>
<div class="line">    cmd.config.hdrConf = 1; <span class="comment">// Insert SEQ and NO_ACK from Tx buffer</span></div>
<div class="line">    cmd.config.autoRetransmitMode = 3; <span class="comment">// Always listen for ACK and retransmit if missing.</span></div>
<div class="line">    cmd.maxRetrans = 5; <span class="comment">// Attempt 5 retransmissions if ACK is not received.</span></div>
<div class="line">    cmd.retransDelay = 50000; <span class="comment">// Wait 50000 Systim ticks (i.e. 12.5 ms) between retransmissions.</span></div>
<div class="line">    cmd.common.status = <a class="code" href="_r_c_l___command_8h.html#ae591a974abf55ca701cf33c61554e0cda1097a97f59467483fb55c8b471cb3036">RCL_CommandStatus_Idle</a>;</div>
<div class="line"> </div>
<div class="line"> </div>
<div class="line">    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; NUM_PKT; i++)</div>
<div class="line">    {</div>
<div class="line">        txBuffers[i] = (RCL_Buffer_TxBuffer *)pktBuffer[i];</div>
<div class="line">    }</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Set up Rx buffer to receive ACK packets */</span></div>
<div class="line">    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; NUM_RX_BUF; i++)</div>
<div class="line">    {</div>
<div class="line">        RCL_MultiBuffer *multiBuffer = (RCL_MultiBuffer *)rxMultiBuffer[i];</div>
<div class="line">        <a class="code" href="group__buffer_api_functions.html#ga9557389c0630c4bf6284036587279945">RCL_MultiBuffer_init</a>(multiBuffer, MULTI_BUF_SZ);</div>
<div class="line">        <a class="code" href="group__buffer_api_functions.html#gaf9be361ce2825a10f9ee8a132f8ad920">RCL_MultiBuffer_put</a>(&amp;multiBuffers, multiBuffer);</div>
<div class="line">    }</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Clear multibuffer before starting the operation */</span></div>
<div class="line">    RCL_MultiBuffer *multiBuffer = <a class="code" href="group__buffer_api_functions.html#gaf48f36094b2839027feea9b2ed3db023">RCL_MultiBuffer_head</a>(&amp;multiBuffers);</div>
<div class="line">    <span class="keywordflow">while</span> (multiBuffer != NULL)</div>
<div class="line">    {</div>
<div class="line">        <a class="code" href="group__buffer_api_functions.html#gabbbf7364e16aae6951ee7c827de9bf06">RCL_MultiBuffer_clear</a>(multiBuffer);</div>
<div class="line">        multiBuffer = <a class="code" href="group__buffer_api_functions.html#ga05fa5798eb559b09a069b15bad0de4f1">RCL_MultiBuffer_next</a>(multiBuffer);</div>
<div class="line">    }</div>
<div class="line">    cmd.rxBuffers = multiBuffers;</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Generate the packets that will be sent and fill Tx buffer */</span></div>
<div class="line">    generatePackets(txBuffers, NUM_PKT, PKT_LEN, &amp;hdrDef, address, addressLen);</div>
<div class="line">    <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = 0; i &lt; NUM_PKT; i++)</div>
<div class="line">    {</div>
<div class="line">        <a class="code" href="group__buffer_api_functions.html#ga7ef1355f9f5e5afb2e301ab8554b4239">RCL_TxBuffer_put</a>(&amp;cmd.txBuffers, txBuffers[i]);</div>
<div class="line">    }</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Schedule first command considering a start delay of 600 us */</span></div>
<div class="line">    uint32_t nextTime = <a class="code" href="group__timing_api_functions.html#gadf6e67c88e75cbe44f52b5b93eecdd09">RCL_Scheduler_getCurrentTime</a>() + <a class="code" href="_r_c_l___scheduler_8h.html#acdfb6b54cdc9e000704111729a8319a7">RCL_SCHEDULER_SYSTIM_US</a>(600);</div>
<div class="line">    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; NUM_PKT; i++)</div>
<div class="line">    {</div>
<div class="line">        cmd.common.status = <a class="code" href="_r_c_l___command_8h.html#ae591a974abf55ca701cf33c61554e0cda1097a97f59467483fb55c8b471cb3036">RCL_CommandStatus_Idle</a>;</div>
<div class="line">        cmd.common.timing.absStartTime = nextTime;</div>
<div class="line"> </div>
<div class="line">        <a class="code" href="_r_c_l_8c.html#a335ebd06e9591a1a9ec26bde80199d96">RCL_Command_submit</a>(h, &amp;cmd);</div>
<div class="line">        <span class="comment">/* Wait for command to conclude  */</span></div>
<div class="line">        <a class="code" href="_r_c_l_8c.html#adc809f6096147ac6e33641fb2161a859">RCL_Command_pend</a>(&amp;cmd);</div>
<div class="line"> </div>
<div class="line">        <span class="comment">/* Schedule next command considering the same start delay */</span></div>
<div class="line">        nextTime = <a class="code" href="group__timing_api_functions.html#gadf6e67c88e75cbe44f52b5b93eecdd09">RCL_Scheduler_getCurrentTime</a>() + <a class="code" href="_r_c_l___scheduler_8h.html#acdfb6b54cdc9e000704111729a8319a7">RCL_SCHEDULER_SYSTIM_US</a>(600);</div>
<div class="line">    }</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Check ACK packets */</span></div>
<div class="line">    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; NUM_PKT; i++)</div>
<div class="line">    {</div>
<div class="line">        RCL_Buffer_DataEntry *rxPkt = <a class="code" href="group__buffer_api_functions.html#ga34d0923dddc433082c4d673e7331772d">RCL_MultiBuffer_RxEntry_get</a>(&amp;cmd.rxBuffers, NULL);</div>
<div class="line">            <span class="keywordflow">if</span> (rxPkt != NULL)</div>
<div class="line">            {</div>
<div class="line">                <span class="comment">/* Do something with the received ACK */</span></div>
<div class="line">            }</div>
<div class="line">    }</div>
<div class="line">}</div>
</div><!-- fragment --> <h1><a class="anchor" id="autotoc_md46"></a>
Architecture</h1>
<p>The NESB Ptx command handler has a life cycle that depends on several things. If configuration is such that an acknowledgement is expected, the device will automatically switch from Tx mode to Rx mode to listen for an acknowledge coming from an associated PRX device in the network. Furthermore, if retransmission of unacknowledged packets is enabled, the PTX command handler will automatically switch back and forth between Tx mode and Rx mode in order to retransmit the packet. This will go on for a user-defined number of times and with a user-defined retransmission delay. If a valid acknowledgement is received, or if a packet is transmitted and no acknowledgement is expected, the command will conclude not before incrementing a sequence number that is used by the PRX device to differentiate between new packets and retransmitted packets.</p>
<p>Once this has happened, the callback and the command status can be used for error checking and the application can proceed according to its specification.</p>
<div class="plantumlgraph">
<img src="inline_umlgraph_10.png" />
<div class="caption">
NESB PTX handler state machine</div>
</div>
<table class="markdownTable">
<tr class="markdownTableHead">
<th class="markdownTableHeadNone"><a class="el" href="_r_c_l_8h.html#struct_r_c_l" title="Global shared driver state.">RCL</a> Event (In) </th><th class="markdownTableHeadNone">Description  </th></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone"><em>setup</em> </td><td class="markdownTableBodyNone">Setup has been performed  </td></tr>
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<td class="markdownTableBodyNone"><em>timerStart</em> </td><td class="markdownTableBodyNone">Timer-based start signalled  </td></tr>
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<th class="markdownTableHeadNone"><a class="el" href="_r_c_l_8h.html#struct_r_c_l" title="Global shared driver state.">RCL</a> Event (Out) </th><th class="markdownTableHeadNone">Description  </th></tr>
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<td class="markdownTableBodyNone"><em>lastCmdDone</em> </td><td class="markdownTableBodyNone">The <a class="el" href="_r_c_l_8h.html#struct_r_c_l" title="Global shared driver state.">RCL</a> is finished with the command  </td></tr>
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<td class="markdownTableBodyNone"><em>cmdStarted</em> </td><td class="markdownTableBodyNone">Command handler has accepted and started executing  </td></tr>
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<td class="markdownTableBodyNone"><em>rxBufferFinished</em> </td><td class="markdownTableBodyNone">An RX multi-buffer is finished  </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone"><em>rxEntryAvail</em> </td><td class="markdownTableBodyNone">An RX entry has been made available  </td></tr>
</table>
<table class="markdownTable">
<tr class="markdownTableHead">
<th class="markdownTableHeadNone">LRF Event </th><th class="markdownTableHeadNone">Description  </th></tr>
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<td class="markdownTableBodyNone"><em>opDone</em> </td><td class="markdownTableBodyNone">The PBE operation has finished  </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone"><em>opError</em> </td><td class="markdownTableBodyNone">Something went wrong. Cause located in the PBE ENDCAUSE register  </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone"><em>rxOk</em> </td><td class="markdownTableBodyNone">Packet received with CRC OK and not to be ignored by the MCU  </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone"><em>rxNok</em> </td><td class="markdownTableBodyNone">Packet received with CRC error  </td></tr>
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<div class="ttc" id="agroup__buffer_api_functions_html_ga7ef1355f9f5e5afb2e301ab8554b4239"><div class="ttname"><a href="group__buffer_api_functions.html#ga7ef1355f9f5e5afb2e301ab8554b4239">RCL_TxBuffer_put</a></div><div class="ttdeci">void RCL_TxBuffer_put(List_List *list, RCL_Buffer_TxBuffer *elem)</div><div class="ttdoc">Function to atomically put an elem onto the end of a Tx Buffer list.</div><div class="ttdef"><b>Definition:</b> RCL_Buffer.c:58</div></div>
<div class="ttc" id="a_r_c_l_8c_html_adc809f6096147ac6e33641fb2161a859"><div class="ttname"><a href="_r_c_l_8c.html#adc809f6096147ac6e33641fb2161a859">RCL_Command_pend</a></div><div class="ttdeci">RCL_CommandStatus RCL_Command_pend(RCL_Command_Handle c)</div><div class="ttdoc">Wait for a submitted command to complete.</div><div class="ttdef"><b>Definition:</b> RCL.c:667</div></div>
<div class="ttc" id="a_r_c_l_8c_html_ad250dbda0747820e489d38cdb268ecee"><div class="ttname"><a href="_r_c_l_8c.html#ad250dbda0747820e489d38cdb268ecee">RCL_open</a></div><div class="ttdeci">RCL_Handle RCL_open(RCL_Client *c, const LRF_Config *lrfConfig)</div><div class="ttdoc">Initializes an RCL client instance.</div><div class="ttdef"><b>Definition:</b> RCL.c:554</div></div>
<div class="ttc" id="a_r_c_l___scheduler_8h_html_acdfb6b54cdc9e000704111729a8319a7"><div class="ttname"><a href="_r_c_l___scheduler_8h.html#acdfb6b54cdc9e000704111729a8319a7">RCL_SCHEDULER_SYSTIM_US</a></div><div class="ttdeci">#define RCL_SCHEDULER_SYSTIM_US(x)</div><div class="ttdef"><b>Definition:</b> RCL_Scheduler.h:45</div></div>
<div class="ttc" id="a_r_c_l_8c_html_a335ebd06e9591a1a9ec26bde80199d96"><div class="ttname"><a href="_r_c_l_8c.html#a335ebd06e9591a1a9ec26bde80199d96">RCL_Command_submit</a></div><div class="ttdeci">RCL_CommandStatus RCL_Command_submit(RCL_Handle h, RCL_Command_Handle c)</div><div class="ttdoc">Submit RCL command object to be scheduled for execution.</div><div class="ttdef"><b>Definition:</b> RCL.c:633</div></div>
<div class="ttc" id="agroup__timing_api_functions_html_gadf6e67c88e75cbe44f52b5b93eecdd09"><div class="ttname"><a href="group__timing_api_functions.html#gadf6e67c88e75cbe44f52b5b93eecdd09">RCL_Scheduler_getCurrentTime</a></div><div class="ttdeci">static uint32_t RCL_Scheduler_getCurrentTime(void)</div><div class="ttdoc">Get current time.</div><div class="ttdef"><b>Definition:</b> RCL_Scheduler.h:233</div></div>
<div class="ttc" id="agroup__buffer_api_functions_html_gaf9be361ce2825a10f9ee8a132f8ad920"><div class="ttname"><a href="group__buffer_api_functions.html#gaf9be361ce2825a10f9ee8a132f8ad920">RCL_MultiBuffer_put</a></div><div class="ttdeci">void RCL_MultiBuffer_put(List_List *list, RCL_MultiBuffer *elem)</div><div class="ttdoc">Function to atomically put an elem onto the end of a multi buffer list.</div><div class="ttdef"><b>Definition:</b> RCL_Buffer.c:117</div></div>
<div class="ttc" id="agroup__buffer_api_functions_html_ga34d0923dddc433082c4d673e7331772d"><div class="ttname"><a href="group__buffer_api_functions.html#ga34d0923dddc433082c4d673e7331772d">RCL_MultiBuffer_RxEntry_get</a></div><div class="ttdeci">RCL_Buffer_DataEntry * RCL_MultiBuffer_RxEntry_get(List_List *list, List_List *consumedBuffers)</div><div class="ttdoc">Function to get the first entry in a MultiBuffer list.</div><div class="ttdef"><b>Definition:</b> RCL_Buffer.c:127</div></div>
<div class="ttc" id="a_r_c_l___event_8h_html_a9e6384116d9e2d84f36990827d6e86f1"><div class="ttname"><a href="_r_c_l___event_8h.html#a9e6384116d9e2d84f36990827d6e86f1">RCL_EventLastCmdDone</a></div><div class="ttdeci">#define RCL_EventLastCmdDone</div><div class="ttdef"><b>Definition:</b> RCL_Event.h:40</div></div>
<div class="ttc" id="a_r_c_l___command_8h_html_ae591a974abf55ca701cf33c61554e0cda1097a97f59467483fb55c8b471cb3036"><div class="ttname"><a href="_r_c_l___command_8h.html#ae591a974abf55ca701cf33c61554e0cda1097a97f59467483fb55c8b471cb3036">RCL_CommandStatus_Idle</a></div><div class="ttdeci">@ RCL_CommandStatus_Idle</div><div class="ttdef"><b>Definition:</b> RCL_Command.h:84</div></div>
<div class="ttc" id="agroup__buffer_api_functions_html_ga6fc3e5a4bff33ded64a77ea203128805"><div class="ttname"><a href="group__buffer_api_functions.html#ga6fc3e5a4bff33ded64a77ea203128805">RCL_TxBuffer_init</a></div><div class="ttdeci">uint8_t * RCL_TxBuffer_init(RCL_Buffer_TxBuffer *buffer, uint32_t numPad, uint32_t hdrLen, uint32_t dataLen)</div><div class="ttdoc">Function to initialize a TX buffer entry for use by RCL.</div><div class="ttdef"><b>Definition:</b> RCL_Buffer.c:69</div></div>
<div class="ttc" id="agroup__buffer_api_functions_html_gaf48f36094b2839027feea9b2ed3db023"><div class="ttname"><a href="group__buffer_api_functions.html#gaf48f36094b2839027feea9b2ed3db023">RCL_MultiBuffer_head</a></div><div class="ttdeci">static RCL_MultiBuffer * RCL_MultiBuffer_head(List_List *list)</div><div class="ttdoc">Function to return the head of a MultiBuffer list.</div><div class="ttdef"><b>Definition:</b> RCL_Buffer.h:257</div></div>
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<div class="ttc" id="a_r_c_l___command_8h_html_ade08c929505da062070474163417817da36e4eb855b1a8b435564f5911266a55b"><div class="ttname"><a href="_r_c_l___command_8h.html#ade08c929505da062070474163417817da36e4eb855b1a8b435564f5911266a55b">RCL_Schedule_AbsTime</a></div><div class="ttdeci">@ RCL_Schedule_AbsTime</div><div class="ttdef"><b>Definition:</b> RCL_Command.h:136</div></div>
<div class="ttc" id="a_r_c_l_8c_html_a145b90e0682b0e3fd914772879861e44"><div class="ttname"><a href="_r_c_l_8c.html#a145b90e0682b0e3fd914772879861e44">RCL_init</a></div><div class="ttdeci">int RCL_init(void)</div><div class="ttdoc">Initializes the RCL driver state.</div><div class="ttdef"><b>Definition:</b> RCL.c:537</div></div>
<div class="ttc" id="agroup__buffer_api_functions_html_ga9557389c0630c4bf6284036587279945"><div class="ttname"><a href="group__buffer_api_functions.html#ga9557389c0630c4bf6284036587279945">RCL_MultiBuffer_init</a></div><div class="ttdeci">void RCL_MultiBuffer_init(RCL_MultiBuffer *buffer, size_t size)</div><div class="ttdoc">Function to initialize a multi buffer entry for use by RCL.</div><div class="ttdef"><b>Definition:</b> RCL_Buffer.c:105</div></div>
<div class="ttc" id="acommands_2generic_8h_html_abf346875f81c8e9bbe0371a3e6cf9433"><div class="ttname"><a href="commands_2generic_8h.html#abf346875f81c8e9bbe0371a3e6cf9433">RCL_CmdNesbPtx_DefaultRuntime</a></div><div class="ttdeci">#define RCL_CmdNesbPtx_DefaultRuntime()</div><div class="ttdef"><b>Definition:</b> generic.h:354</div></div>
<div class="ttc" id="a_r_c_l___event_8h_html_a27efe993ce19cd501e8aadb7c5fa4aee"><div class="ttname"><a href="_r_c_l___event_8h.html#a27efe993ce19cd501e8aadb7c5fa4aee">RCL_EventRxEntryAvail</a></div><div class="ttdeci">#define RCL_EventRxEntryAvail</div><div class="ttdef"><b>Definition:</b> RCL_Event.h:41</div></div>
<div class="ttc" id="agroup__buffer_api_functions_html_ga05fa5798eb559b09a069b15bad0de4f1"><div class="ttname"><a href="group__buffer_api_functions.html#ga05fa5798eb559b09a069b15bad0de4f1">RCL_MultiBuffer_next</a></div><div class="ttdeci">static RCL_MultiBuffer * RCL_MultiBuffer_next(RCL_MultiBuffer *elem)</div><div class="ttdoc">Function to return the next elem in a linked list of MultiBuffers.</div><div class="ttdef"><b>Definition:</b> RCL_Buffer.h:272</div></div>
<div class="ttc" id="agroup__buffer_api_functions_html_gade3c0fd0ae25d389875981dac43d5f15"><div class="ttname"><a href="group__buffer_api_functions.html#gade3c0fd0ae25d389875981dac43d5f15">RCL_TxBuffer_len_u32</a></div><div class="ttdeci">#define RCL_TxBuffer_len_u32(numPad, hdrLen, dataLen)</div><div class="ttdoc">Total length of a TX buffer in 32-bit words, including all fields and padding.</div><div class="ttdef"><b>Definition:</b> RCL_Buffer.h:158</div></div>
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<div class="title">NESB PRX Command Handler </div>  </div>
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<div class="textblock"><h1><a class="anchor" id="autotoc_md41"></a>
Introduction</h1>
<p>A PRX device normally acts as the main receiver in an NESB network. Depending on user configuration, the handler acts similarly to the Generic Rx Command handler, or it can add automatic acknowledgement and address filtering.</p>
<p>The following sections describe how the command can be configured and used, its life cycle, and how it fits into the <a class="el" href="_r_c_l_8h.html#struct_r_c_l" title="Global shared driver state.">RCL</a> architecture.</p>
<h1><a class="anchor" id="autotoc_md42"></a>
Usage</h1>
<p>In order to submit a PRX command, the following steps must have taken place:</p>
<ol type="1">
<li><a class="el" href="_r_c_l_8h.html#struct_r_c_l" title="Global shared driver state.">RCL</a> has been initialized (See <a class="el" href="_r_c_l_8h.html#a2fa1415c07a809621287abfc9b7f40f7" title="Initializes the RCL driver state.">RCL_init</a>) and a handle must exist (See <a class="el" href="_r_c_l_8h.html#ad250dbda0747820e489d38cdb268ecee" title="Initializes an RCL client instance.">RCL_open</a>).</li>
<li>The <a class="el" href="commands_2generic_8h.html#struct_r_c_l___c_m_d___n_e_s_b___p_r_x__t" title="NESB receive command.">RCL_CMD_NESB_PRX_t</a> command has been initialized and configured.</li>
<li>A Multibuffer has been set up to receive the incoming packets.</li>
</ol>
<p>Once these steps have been completed, <a class="el" href="_r_c_l_8h.html#a335ebd06e9591a1a9ec26bde80199d96" title="Submit RCL command object to be scheduled for execution.">RCL_Command_submit</a> and <a class="el" href="_r_c_l_8h.html#adc809f6096147ac6e33641fb2161a859" title="Wait for a submitted command to complete.">RCL_Command_pend</a> are called to effectively send a packet and then wait for the command to conclude.</p>
<p>As with any command handler, the application must built packets so that they are compatible with the internal packet format used in the LRF. Having said this, NESB packets also have a specific packet format that needs to be considered at the application level.</p>
<p>This can be accomplished by using a struct to define the various fields that need to be considered when building or checking the content of the packet.</p>
<div class="fragment"><div class="line"><span class="preprocessor">#define PKT_LEN 200</span></div>
<div class="line"><span class="preprocessor">#define HDR_LEN 3</span></div>
<div class="line"><span class="preprocessor">#define NUM_PKT 4</span></div>
<div class="line"><span class="preprocessor">#define NUM_PAD 3</span></div>
<div class="line"><span class="preprocessor">#define NUM_RX_BUF 1</span></div>
<div class="line"><span class="preprocessor">#define MULTI_BUF_SZ 2048</span></div>
<div class="line"><span class="preprocessor">#define FREQUENCY 2470000000</span></div>
<div class="line"><span class="preprocessor">#define SYNCWORD 0xAB0B51DE</span></div>
<div class="line"><span class="preprocessor">#define NESB_ADDR 0xAC9825CB</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#define NESB_hdrDef_Default()   \</span></div>
<div class="line"><span class="preprocessor">{                               \</span></div>
<div class="line"><span class="preprocessor">    .numHdrBits = 11,           \</span></div>
<div class="line"><span class="preprocessor">    .numLenBits = 8,            \</span></div>
<div class="line"><span class="preprocessor">    .lenPos = 3,                \</span></div>
<div class="line"><span class="preprocessor">    .lenOffset = 0,             \</span></div>
<div class="line"><span class="preprocessor">    .numPad = 3,                \</span></div>
<div class="line"><span class="preprocessor">}</span></div>
<div class="line"><span class="preprocessor">#define NESB_hdrDef_DefaultRuntime() (ExampleRCL_NesbHdrDef) NESB_hdrDef_Default()</span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <span class="keyword">struct </span>{</div>
<div class="line">    uint8_t numHdrBits;</div>
<div class="line">    uint8_t numLenBits;</div>
<div class="line">    uint8_t lenPos;</div>
<div class="line">    int8_t lenOffset;</div>
<div class="line">    uint8_t numPad;</div>
<div class="line">} ExampleRCL_NesbHdrDef;</div>
</div><!-- fragment --><p> Taking this into consideration, packet generation needs to consider how the 11-bit header is placed in the LRF FIFO. the following function shows one way to accomplish this:</p>
<div class="fragment"><div class="line"><span class="keywordtype">void</span> generatePackets(RCL_Buffer_TxBuffer **txBuffers, uint32_t numPkt, uint32_t pktLen,</div>
<div class="line">                     ExampleRCL_NesbHdrDef *hdrDef, uint32_t address, uint32_t addressLen)</div>
<div class="line">{</div>
<div class="line">    <span class="keyword">union</span></div>
<div class="line">    {</div>
<div class="line">        uint32_t value;</div>
<div class="line">        uint8_t bytes[4];</div>
<div class="line">    } nesbAddress;</div>
<div class="line">    <span class="keyword">union</span></div>
<div class="line">    {</div>
<div class="line">        uint16_t value;</div>
<div class="line">        uint8_t bytes[2];</div>
<div class="line">    } nesbHeader;</div>
<div class="line"> </div>
<div class="line">    uint8_t hdrLen = (hdrDef-&gt;numHdrBits + 7) / 8;</div>
<div class="line">    uint8_t seqNum = 0; <span class="comment">// Start with a seq number equal to zero</span></div>
<div class="line">    uint8_t noAckBit = 0; <span class="comment">// Always set the noAckBit to zero</span></div>
<div class="line">    nesbAddress.value = address;</div>
<div class="line"> </div>
<div class="line">    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; numPkt; i++)</div>
<div class="line">    {</div>
<div class="line">        uint8_t *txData;</div>
<div class="line"> </div>
<div class="line">        <span class="comment">/* Initialize Tx Buffer */</span></div>
<div class="line">        txData = <a class="code" href="group__buffer_api_functions.html#ga6fc3e5a4bff33ded64a77ea203128805">RCL_TxBuffer_init</a>(txBuffers[i], hdrDef-&gt;numPad, hdrLen, pktLen);</div>
<div class="line"> </div>
<div class="line">        <span class="comment">/* Build the 11 bit NESB header */</span></div>
<div class="line">        nesbHeader.value = ((pktLen &lt;&lt; 3) | (seqNum &lt;&lt; 1) | noAckBit);</div>
<div class="line"> </div>
<div class="line">        <span class="comment">/* Write NESB header to buffer */</span></div>
<div class="line">        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; hdrLen; i++)</div>
<div class="line">        {</div>
<div class="line">            txData[i] = nesbHeader.bytes[i];</div>
<div class="line">        }</div>
<div class="line">        <span class="comment">/* Write NESB address to buffer. Address comes immediately after header */</span></div>
<div class="line">        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; addressLen; i++)</div>
<div class="line">        {</div>
<div class="line">            txData[hdrLen + i] = nesbAddress.bytes[i];</div>
<div class="line">        }</div>
<div class="line">        <span class="comment">/* Write the payload */</span></div>
<div class="line">        <span class="keywordflow">if</span>(pktLen &gt;= addressLen)</div>
<div class="line">        {</div>
<div class="line">            uint32_t payloadLength = pktLen - addressLen;</div>
<div class="line">            <span class="keywordflow">for</span>(uint32_t i = 0; i &lt; payloadLength; i++)</div>
<div class="line">            {</div>
<div class="line">                txData[hdrLen + addressLen + i] = i &amp; 0xFF;</div>
<div class="line">            }</div>
<div class="line">        }</div>
<div class="line">        <span class="comment">/* Update packet ID (seq number) for next packet */</span></div>
<div class="line">        seqNum = (seqNum + 1) % 4;</div>
<div class="line">    }</div>
<div class="line">}</div>
</div><!-- fragment --><p> Command configuration and submitting is similar to generic command handlers, but depending on the desired auto acknowledgment behavior, it might be necessary to also configure the sycnword specific behavior.</p>
<div class="fragment"><div class="line"><span class="preprocessor">#define NUM_RX_BUF 1</span></div>
<div class="line"><span class="preprocessor">#define MULTI_BUF_SZ 2048</span></div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> runNesbPrx(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line">    uint32_t rxMultiBuffer[NUM_RX_BUF][MULTI_BUF_SZ / 4];</div>
<div class="line">    List_List multiBuffers = { 0 };</div>
<div class="line"> </div>
<div class="line">    <a class="code" href="_r_c_l_8c.html#a145b90e0682b0e3fd914772879861e44">RCL_init</a>();</div>
<div class="line">    RCL_Handle h = <a class="code" href="_r_c_l_8c.html#ad250dbda0747820e489d38cdb268ecee">RCL_open</a>(&amp;rclClient, &amp;LRF_configNesb);</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Declare command */</span></div>
<div class="line">    RCL_CmdNesbPrx cmd;</div>
<div class="line">    cmd = <a class="code" href="commands_2generic_8h.html#aa3f20f7a02b6bb444a48846c8a322cd3">RCL_CmdNesbPrx_DefaultRuntime</a>();</div>
<div class="line">    RCL_StatsNesb rxStats;</div>
<div class="line">    rxStats = <a class="code" href="commands_2generic_8h.html#a10b0c9e2e88c99a8b03e3ac82df0445e">RCL_StatsNesb_DefaultRuntime</a>();</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Command configuration */</span></div>
<div class="line">    cmd.common.scheduling = <a class="code" href="_r_c_l___command_8h.html#ade08c929505da062070474163417817da36e4eb855b1a8b435564f5911266a55b">RCL_Schedule_AbsTime</a>;</div>
<div class="line">    cmd.common.runtime.callback = defaultCallback;</div>
<div class="line">    cmd.common.runtime.rclCallbackMask.value = <a class="code" href="_r_c_l___event_8h.html#a9e6384116d9e2d84f36990827d6e86f1">RCL_EventLastCmdDone</a>.value | <a class="code" href="_r_c_l___event_8h.html#a27efe993ce19cd501e8aadb7c5fa4aee">RCL_EventRxEntryAvail</a>.value;</div>
<div class="line">    cmd.rfFrequency = FREQUENCY;</div>
<div class="line">    cmd.syncWordA = SYNCWORD;</div>
<div class="line">    cmd.syncWord[0].address = NESB_ADDR; <span class="comment">// Set NESB address</span></div>
<div class="line">    cmd.addrLen = 4; <span class="comment">// Consider 4 bytes for the NESB address</span></div>
<div class="line">    cmd.syncWord[0].seqValid = 1; <span class="comment">// Only accept packets with sequence number and CRC different from the previous one</span></div>
<div class="line">    cmd.syncWord[0].autoAckMode = 3; <span class="comment">// Enable auto-acknowledgement regardless of received NO_ACK.</span></div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Stats configuration */</span></div>
<div class="line">    rxStats.config.accumulate = 1;</div>
<div class="line">    rxStats.nTx = 0;</div>
<div class="line">    rxStats.nRxOk = 0;</div>
<div class="line">    rxStats.nRxNok = 0;</div>
<div class="line">    rxStats.nRxIgnored = 0;</div>
<div class="line">    rxStats.nRxAddrMismatch = 0;</div>
<div class="line">    rxStats.nRxBufFull = 0;</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Set up Rx (multi)buffer */</span></div>
<div class="line">    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; NUM_RX_BUF; i++)</div>
<div class="line">    {</div>
<div class="line">        RCL_MultiBuffer *multiBuffer = (RCL_MultiBuffer *) rxMultiBuffer[i];</div>
<div class="line">        <a class="code" href="group__buffer_api_functions.html#ga9557389c0630c4bf6284036587279945">RCL_MultiBuffer_init</a>(multiBuffer, MULTI_BUF_SZ);</div>
<div class="line">        <a class="code" href="group__buffer_api_functions.html#gaf9be361ce2825a10f9ee8a132f8ad920">RCL_MultiBuffer_put</a>(&amp;multiBuffers, multiBuffer);</div>
<div class="line">    }</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Setup a graceful stop time */</span></div>
<div class="line">    uint32_t ticksPerByte = <a class="code" href="_r_c_l___scheduler_8h.html#acdfb6b54cdc9e000704111729a8319a7">RCL_SCHEDULER_SYSTIM_US</a>(8);</div>
<div class="line">    uint32_t startDelay = <a class="code" href="_r_c_l___scheduler_8h.html#acdfb6b54cdc9e000704111729a8319a7">RCL_SCHEDULER_SYSTIM_US</a>(600);</div>
<div class="line">    uint32_t endPktDelay = <a class="code" href="_r_c_l___scheduler_8h.html#acdfb6b54cdc9e000704111729a8319a7">RCL_SCHEDULER_SYSTIM_US</a>(150);</div>
<div class="line">    uint32_t packetOffset = ticksPerByte * 10 + endPktDelay;</div>
<div class="line">    uint32_t pktInterval = ticksPerByte * cmd.syncWord[0].maxPktLen + packetOffset;</div>
<div class="line">    cmd.common.timing.relGracefulStopTime = startDelay + NUM_PKT * pktInterval;</div>
<div class="line">    cmd.stats = &amp;rxStats;</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Clear multi buffers before starting */</span></div>
<div class="line">    RCL_MultiBuffer *multiBuffer = <a class="code" href="group__buffer_api_functions.html#gaf48f36094b2839027feea9b2ed3db023">RCL_MultiBuffer_head</a>(&amp;multiBuffers);</div>
<div class="line">    <span class="keywordflow">while</span> (multiBuffer != NULL)</div>
<div class="line">    {</div>
<div class="line">        <a class="code" href="group__buffer_api_functions.html#gabbbf7364e16aae6951ee7c827de9bf06">RCL_MultiBuffer_clear</a>(multiBuffer);</div>
<div class="line">        multiBuffer = <a class="code" href="group__buffer_api_functions.html#ga05fa5798eb559b09a069b15bad0de4f1">RCL_MultiBuffer_next</a>(multiBuffer);</div>
<div class="line">    }</div>
<div class="line">    cmd.rxBuffers = multiBuffers;</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Schedule command considering a start delay of 600 us */</span></div>
<div class="line">    uint32_t nextTime = <a class="code" href="group__timing_api_functions.html#gadf6e67c88e75cbe44f52b5b93eecdd09">RCL_Scheduler_getCurrentTime</a>() + <a class="code" href="_r_c_l___scheduler_8h.html#acdfb6b54cdc9e000704111729a8319a7">RCL_SCHEDULER_SYSTIM_US</a>(600);</div>
<div class="line">    cmd.common.timing.absStartTime = nextTime;</div>
<div class="line"> </div>
<div class="line">    <a class="code" href="_r_c_l_8c.html#a335ebd06e9591a1a9ec26bde80199d96">RCL_Command_submit</a>(h, &amp;cmd);</div>
<div class="line">    <span class="comment">/* Wait for command to conclude  */</span></div>
<div class="line">    <a class="code" href="_r_c_l_8c.html#adc809f6096147ac6e33641fb2161a859">RCL_Command_pend</a>(&amp;cmd);</div>
<div class="line"> </div>
<div class="line">    <span class="comment">/* Check the packet contents */</span></div>
<div class="line">    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; NUM_PKT; i++)</div>
<div class="line">    {</div>
<div class="line">        RCL_Buffer_DataEntry *rxPkt = <a class="code" href="group__buffer_api_functions.html#ga34d0923dddc433082c4d673e7331772d">RCL_MultiBuffer_RxEntry_get</a>(&amp;cmd.rxBuffers, NULL);</div>
<div class="line">        <span class="keywordflow">if</span> (rxPkt != NULL)</div>
<div class="line">        {</div>
<div class="line">            <span class="comment">/* Do something with the received data */</span></div>
<div class="line">        }</div>
<div class="line">    }</div>
<div class="line">}</div>
</div><!-- fragment --><h1><a class="anchor" id="autotoc_md43"></a>
Architecture</h1>
<p>The NESB Prx command handler has a life cycle that depends on several things. If configuration is such that an acknowledgement is expected, the device will automatically switch from Rx mode to Tx mode to send an acknowledge to the specific PTX device that started the packet transaction. Furthermore, the PRX device performs address filtering so that it can ignore packets coming from PTX devices not associated with the network. If a valid packet from a valid address is received, the command can either continue listening for additional packets until a graceful or hard stop ends the operation. Once this has happened, the callback and the command status can be used for error checking and the application can proceed according to its specification.</p>
<div class="plantumlgraph">
<img src="inline_umlgraph_9.png" />
<div class="caption">
NESB PRX handler state machine</div>
</div>
<table class="markdownTable">
<tr class="markdownTableHead">
<th class="markdownTableHeadNone"><a class="el" href="_r_c_l_8h.html#struct_r_c_l" title="Global shared driver state.">RCL</a> Event (In) </th><th class="markdownTableHeadNone">Description  </th></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone"><em>setup</em> </td><td class="markdownTableBodyNone">Setup has been performed  </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone"><em>timerStart</em> </td><td class="markdownTableBodyNone">Timer-based start signalled  </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone"><em>rxBufferUpdate</em> </td><td class="markdownTableBodyNone">RX buffer has been updated  </td></tr>
</table>
<table class="markdownTable">
<tr class="markdownTableHead">
<th class="markdownTableHeadNone"><a class="el" href="_r_c_l_8h.html#struct_r_c_l" title="Global shared driver state.">RCL</a> Event (Out) </th><th class="markdownTableHeadNone">Description  </th></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone"><em>lastCmdDone</em> </td><td class="markdownTableBodyNone">The <a class="el" href="_r_c_l_8h.html#struct_r_c_l" title="Global shared driver state.">RCL</a> is finished with the command  </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone"><em>cmdStarted</em> </td><td class="markdownTableBodyNone">Command handler has accepted and started executing  </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone"><em>rxBufferFinished</em> </td><td class="markdownTableBodyNone">An RX multi-buffer is finished  </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone"><em>rxEntryAvail</em> </td><td class="markdownTableBodyNone">An RX entry has been made available  </td></tr>
</table>
<table class="markdownTable">
<tr class="markdownTableHead">
<th class="markdownTableHeadNone">LRF Event </th><th class="markdownTableHeadNone">Description  </th></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone"><em>opDone</em> </td><td class="markdownTableBodyNone">The PBE operation has finished  </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone"><em>opError</em> </td><td class="markdownTableBodyNone">Something went wrong. Cause located in the PBE ENDCAUSE register  </td></tr>
<tr class="markdownTableRowOdd">
<td class="markdownTableBodyNone"><em>rxOk</em> </td><td class="markdownTableBodyNone">Packet received with CRC OK and not to be ignored by the MCU  </td></tr>
<tr class="markdownTableRowEven">
<td class="markdownTableBodyNone"><em>rxNok</em> </td><td class="markdownTableBodyNone">Packet received with CRC error  </td></tr>
</table>
</div></div><!-- contents -->
</div><!-- PageDoc -->
</div><!-- doc-content -->
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<div class="ttc" id="a_r_c_l_8c_html_ad250dbda0747820e489d38cdb268ecee"><div class="ttname"><a href="_r_c_l_8c.html#ad250dbda0747820e489d38cdb268ecee">RCL_open</a></div><div class="ttdeci">RCL_Handle RCL_open(RCL_Client *c, const LRF_Config *lrfConfig)</div><div class="ttdoc">Initializes an RCL client instance.</div><div class="ttdef"><b>Definition:</b> RCL.c:554</div></div>
<div class="ttc" id="a_r_c_l___scheduler_8h_html_acdfb6b54cdc9e000704111729a8319a7"><div class="ttname"><a href="_r_c_l___scheduler_8h.html#acdfb6b54cdc9e000704111729a8319a7">RCL_SCHEDULER_SYSTIM_US</a></div><div class="ttdeci">#define RCL_SCHEDULER_SYSTIM_US(x)</div><div class="ttdef"><b>Definition:</b> RCL_Scheduler.h:45</div></div>
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<div class="ttc" id="acommands_2generic_8h_html_a10b0c9e2e88c99a8b03e3ac82df0445e"><div class="ttname"><a href="commands_2generic_8h.html#a10b0c9e2e88c99a8b03e3ac82df0445e">RCL_StatsNesb_DefaultRuntime</a></div><div class="ttdeci">#define RCL_StatsNesb_DefaultRuntime()</div><div class="ttdef"><b>Definition:</b> generic.h:467</div></div>
<div class="ttc" id="agroup__timing_api_functions_html_gadf6e67c88e75cbe44f52b5b93eecdd09"><div class="ttname"><a href="group__timing_api_functions.html#gadf6e67c88e75cbe44f52b5b93eecdd09">RCL_Scheduler_getCurrentTime</a></div><div class="ttdeci">static uint32_t RCL_Scheduler_getCurrentTime(void)</div><div class="ttdoc">Get current time.</div><div class="ttdef"><b>Definition:</b> RCL_Scheduler.h:233</div></div>
<div class="ttc" id="agroup__buffer_api_functions_html_gaf9be361ce2825a10f9ee8a132f8ad920"><div class="ttname"><a href="group__buffer_api_functions.html#gaf9be361ce2825a10f9ee8a132f8ad920">RCL_MultiBuffer_put</a></div><div class="ttdeci">void RCL_MultiBuffer_put(List_List *list, RCL_MultiBuffer *elem)</div><div class="ttdoc">Function to atomically put an elem onto the end of a multi buffer list.</div><div class="ttdef"><b>Definition:</b> RCL_Buffer.c:117</div></div>
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<div class="ttc" id="a_r_c_l___event_8h_html_a9e6384116d9e2d84f36990827d6e86f1"><div class="ttname"><a href="_r_c_l___event_8h.html#a9e6384116d9e2d84f36990827d6e86f1">RCL_EventLastCmdDone</a></div><div class="ttdeci">#define RCL_EventLastCmdDone</div><div class="ttdef"><b>Definition:</b> RCL_Event.h:40</div></div>
<div class="ttc" id="agroup__buffer_api_functions_html_ga6fc3e5a4bff33ded64a77ea203128805"><div class="ttname"><a href="group__buffer_api_functions.html#ga6fc3e5a4bff33ded64a77ea203128805">RCL_TxBuffer_init</a></div><div class="ttdeci">uint8_t * RCL_TxBuffer_init(RCL_Buffer_TxBuffer *buffer, uint32_t numPad, uint32_t hdrLen, uint32_t dataLen)</div><div class="ttdoc">Function to initialize a TX buffer entry for use by RCL.</div><div class="ttdef"><b>Definition:</b> RCL_Buffer.c:69</div></div>
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<div class="ttc" id="agroup__buffer_api_functions_html_ga9557389c0630c4bf6284036587279945"><div class="ttname"><a href="group__buffer_api_functions.html#ga9557389c0630c4bf6284036587279945">RCL_MultiBuffer_init</a></div><div class="ttdeci">void RCL_MultiBuffer_init(RCL_MultiBuffer *buffer, size_t size)</div><div class="ttdoc">Function to initialize a multi buffer entry for use by RCL.</div><div class="ttdef"><b>Definition:</b> RCL_Buffer.c:105</div></div>
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  • 0
    TI__Expert 5535 points

    Hi Wenhao,

    Our PropRf specialist will be out of office until monday. 

    Therefor I would kindly ask you to wait until he returns. In the meanwhile you might be able to find the solution in our Simplelink Academy:  Basic RX and TX (ti.com)

    It would be nice to provide more information after going through the issues.

    In some cases a sniffer log helps us to see what is going on over the air.

    Regards,

    Alex

  • 0
    TI__Genius 14044 points

    Hello Wenhao,

    I hope you are well. I wanted to give you a status update to your issue: we are still currently looking into your issue, we have replicated the test using the example code, and are looking into the results.

    Thanks,
    Alex F

  • 0 in reply to Alex Fager
    Prodigy 20 points

    Hi, Alex,

    Thanks for your support. I compare the NESB packet format with Generic RX. So I remove the address bytes and set the padding byte to 0. The Generic RX can receive the NESB TX payload. When I swap the RX from Generic to NESB the payload was lost but the NESB RF active event can be triggered. 

    Many thanks,
    Jerry.

  • 0 in reply to WENHAO CHOU
    TI__Genius 14044 points

    Hello Jerry,

    I hope you are well. For the implementation of the NESB code there are two ways you can approach it:
    You could first take the example code provided in the SDK (rfPacketRx, rfPacketTx) and modify/add the code on the NESB website as needed.
    The other way is to start from the NESB and add your functions/code as needed; to note, not all the code needed to make NESB to work is provided, so some changes need to be made in order for the program to function correctly. 

    Some notes about the code itself, the code assumes that TX and RX starts simultaneously, and the code has a timeout of (N packets) * (X packet interval). In practice this means in order to make the RX side receive the packets you would need to press reset on TX side and quickly press reset on RX side. However, to make the code a bit more user friendly I would recommend changing the TX "for" loop to a "while" loop (the line below uint32_t nextTime), this way it is much easier to make the RX receive packets (we were able to keep "cmd.config.autoRetransmitMode = 3"). 

    Thanks,
    Alex F

  • 0 in reply to Alex Fager
    Prodigy 20 points

    Thanks for your information. My experiment just wants to know where is the issue. It looks like the NESB RX can't receive the data payload and reply the ACK.
    Since you can replicate with the sample code I can wait for your solution. 

    Thanks,
    Jerry.

  • 0 in reply to WENHAO CHOU
    TI__Genius 14044 points

    Hello Jerry,

    We plan to create some simplified baseline examples to highlight NESB, and share with you; right now we have the RX side working as intended, but the TX side is causing some slight issues, we will get back to you by tomorrow. 

    Thanks,
    Alex F 

  • 0 in reply to Alex Fager
    TI__Genius 14044 points

    Hello Jerry,

    We have addressed the issue with the TX side for NESB. Provided are two sample projects using NESB, one of RX NESB, and one of TX NESB. They should give some better insight into using NESB with "cmd.config.autoRetransmitMode = 3". When you plug both the boards in you should see both blinking to indicate that they are receiving packets and blink a total of 50 times (indicates 100 packets since it is a toggle). Also use the "stats" in debugging session see how the program works (image provided below, nRxOk means the number of packets received from Tx).

    Thanks,
    Alex F

    TxNESB_LP_EM_CC2340R5_freertos_ticlang.zip RxNESB_LP_EM_CC2340R5_freertos_ticlang.zip

  • +1 in reply to Alex Fager
    Prodigy 20 points

    Hi, Alex,

    Thanks for your sample code. Now the NESB function is workable. By the way, the NESB_ADDR_LEN should be 4 in "rtm_test_config.h", right?

    Many thanks,
    Jerry

  • 0 in reply to WENHAO CHOU
    TI__Genius 14044 points

    Hello Jerry,

    Good to hear its working on your end. I think we may have changed the NESB_ADDR_LEN 3 for this version, I just tested it with the NESB_ADDR_LEN in rtm_test_config.h set back to 4 (as that is what the RX side is set to), and it works fine.

    Thanks,
    Alex F