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<div id="projectbrief">Bare-metal PTT firmware for nRF52840 with FHSS</div>
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<p>RADIO peripheral driver implementation.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &quot;<a class="el" href="radio_8h_source.html">radio.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="fhss_8h_source.html">fhss.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="regs_8h_source.html">regs.h</a>&quot;</code><br />
<code>#include &lt;nrf52840.h&gt;</code><br />
<code>#include &lt;string.h&gt;</code><br />
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<tr class="memitem:aa7a7521abb3a3664218d8dc0e3759f0f" id="r_aa7a7521abb3a3664218d8dc0e3759f0f"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="radio_8c.html#aa7a7521abb3a3664218d8dc0e3759f0f">MAX_PAYLOAD</a>&#160;&#160;&#160;255u</td></tr>
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<tr class="memitem:aafa17c307af8c45323500fdac999d294" id="r_aafa17c307af8c45323500fdac999d294"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="radio_8c.html#aafa17c307af8c45323500fdac999d294">DEFAULT_CHANNEL</a>&#160;&#160;&#160;20u /* 2400 + 20 = 2420 MHz (MAP=0) */</td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a2d7a2412663c9b0521415553939b1b05" id="r_a2d7a2412663c9b0521415553939b1b05"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="radio_8c.html#a2d7a2412663c9b0521415553939b1b05">timer_init</a> (void)</td></tr>
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<tr class="memitem:a07de6df4fc71061db1bad70f4370a3fe" id="r_a07de6df4fc71061db1bad70f4370a3fe"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="radio_8c.html#a07de6df4fc71061db1bad70f4370a3fe">dwell_start</a> (void)</td></tr>
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<tr class="memitem:acb45071ad37f0aa0928848eb4a7fc3c6" id="r_acb45071ad37f0aa0928848eb4a7fc3c6"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="radio_8c.html#acb45071ad37f0aa0928848eb4a7fc3c6">dwell_wait</a> (void)</td></tr>
<tr class="separator:acb45071ad37f0aa0928848eb4a7fc3c6"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:acfb21351bb3f0146635745bfacfe26a8" id="r_acfb21351bb3f0146635745bfacfe26a8"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="radio_8c.html#acfb21351bb3f0146635745bfacfe26a8">radio_init</a> (void)</td></tr>
<tr class="memdesc:acfb21351bb3f0146635745bfacfe26a8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Configure the RADIO peripheral (mode, packet format, address, CRC, power). <br /></td></tr>
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<tr class="memitem:a4508602c352170e18afc35ea773edb98" id="r_a4508602c352170e18afc35ea773edb98"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="radio_8c.html#a4508602c352170e18afc35ea773edb98">radio_set_channel</a> (uint8_t ch)</td></tr>
<tr class="memdesc:a4508602c352170e18afc35ea773edb98"><td class="mdescLeft">&#160;</td><td class="mdescRight">Set the RF channel. <br /></td></tr>
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<tr class="memitem:aa98086e3cef509cbd1f899e79e62a39c" id="r_aa98086e3cef509cbd1f899e79e62a39c"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="radio_8c.html#aa98086e3cef509cbd1f899e79e62a39c">radio_tx</a> (const uint8_t *data, uint8_t len)</td></tr>
<tr class="memdesc:aa98086e3cef509cbd1f899e79e62a39c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Transmit one packet synchronously. <br /></td></tr>
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<tr class="memitem:a797c6c01e1ad4076ab54412b8c116de2" id="r_a797c6c01e1ad4076ab54412b8c116de2"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="radio_8c.html#a797c6c01e1ad4076ab54412b8c116de2">radio_tx_burst</a> (void)</td></tr>
<tr class="memdesc:a797c6c01e1ad4076ab54412b8c116de2"><td class="mdescLeft">&#160;</td><td class="mdescRight">Transmit one FHSS hop: advance channel, send PTT frame, hold dwell time. <br /></td></tr>
<tr class="separator:a797c6c01e1ad4076ab54412b8c116de2"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a93ad6d90796885b32326efe3b7c93b17" id="r_a93ad6d90796885b32326efe3b7c93b17"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="radio_8c.html#a93ad6d90796885b32326efe3b7c93b17">radio_rx_burst</a> (<a class="el" href="radio_8h.html#a0f54f3002fc4eaef20595ed5e64b35d7">ptt_frame_t</a> *frame_out)</td></tr>
<tr class="memdesc:a93ad6d90796885b32326efe3b7c93b17"><td class="mdescLeft">&#160;</td><td class="mdescRight">Receive one FHSS hop: advance channel, listen for FHSS_DWELL_MS ms. <br /></td></tr>
<tr class="separator:a93ad6d90796885b32326efe3b7c93b17"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="var-members" name="var-members"></a>
Variables</h2></td></tr>
<tr class="memitem:a883657f0d0158e64f07b1cabb26c4233" id="r_a883657f0d0158e64f07b1cabb26c4233"><td class="memItemLeft" align="right" valign="top">static uint8_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="radio_8c.html#a883657f0d0158e64f07b1cabb26c4233">pkt_buf</a> [<a class="el" href="radio_8c.html#a6821bafc3c88dfb2e433a095df9940c6">BUF_SIZE</a>]</td></tr>
<tr class="separator:a883657f0d0158e64f07b1cabb26c4233"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>RADIO peripheral driver implementation. </p>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
<a id="a6821bafc3c88dfb2e433a095df9940c6" name="a6821bafc3c88dfb2e433a095df9940c6"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a6821bafc3c88dfb2e433a095df9940c6">&#9670;&#160;</a></span>BUF_SIZE</h2>
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<td class="memname">#define BUF_SIZE&#160;&#160;&#160;(1u + <a class="el" href="radio_8c.html#aa7a7521abb3a3664218d8dc0e3759f0f">MAX_PAYLOAD</a>)</td>
</tr>
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</div><div class="memdoc">
</div>
</div>
<a id="aafa17c307af8c45323500fdac999d294" name="aafa17c307af8c45323500fdac999d294"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aafa17c307af8c45323500fdac999d294">&#9670;&#160;</a></span>DEFAULT_CHANNEL</h2>
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<td class="memname">#define DEFAULT_CHANNEL&#160;&#160;&#160;20u /* 2400 + 20 = 2420 MHz (MAP=0) */</td>
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</div>
</div>
<a id="aa7a7521abb3a3664218d8dc0e3759f0f" name="aa7a7521abb3a3664218d8dc0e3759f0f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa7a7521abb3a3664218d8dc0e3759f0f">&#9670;&#160;</a></span>MAX_PAYLOAD</h2>
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<td class="memname">#define MAX_PAYLOAD&#160;&#160;&#160;255u</td>
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</div>
<a id="a5ba6ab6a6b9198ea1b4699619f932d42" name="a5ba6ab6a6b9198ea1b4699619f932d42"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a5ba6ab6a6b9198ea1b4699619f932d42">&#9670;&#160;</a></span>RADIO_BASE0</h2>
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<td class="memname">#define RADIO_BASE0&#160;&#160;&#160;0x12345678u</td>
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<a id="aef53fc9f6c8f7ce51d3b94dfd9ada305" name="aef53fc9f6c8f7ce51d3b94dfd9ada305"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aef53fc9f6c8f7ce51d3b94dfd9ada305">&#9670;&#160;</a></span>RADIO_PREFIX0</h2>
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<td class="memname">#define RADIO_PREFIX0&#160;&#160;&#160;0xABu /* logical address 0: <a class="el" href="radio_8c.html#a5ba6ab6a6b9198ea1b4699619f932d42">RADIO_BASE0</a> + RADIO_PREFIX0[7:0] */</td>
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<h2 class="groupheader">Function Documentation</h2>
<a id="a07de6df4fc71061db1bad70f4370a3fe" name="a07de6df4fc71061db1bad70f4370a3fe"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a07de6df4fc71061db1bad70f4370a3fe">&#9670;&#160;</a></span>dwell_start()</h2>
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<td class="memname">static void dwell_start </td>
<td>(</td>
<td class="paramtype">void&#160;</td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
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</td>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<a id="acb45071ad37f0aa0928848eb4a7fc3c6" name="acb45071ad37f0aa0928848eb4a7fc3c6"></a>
<h2 class="memtitle"><span class="permalink"><a href="#acb45071ad37f0aa0928848eb4a7fc3c6">&#9670;&#160;</a></span>dwell_wait()</h2>
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<td class="memname">static void dwell_wait </td>
<td>(</td>
<td class="paramtype">void&#160;</td>
<td class="paramname"></td><td>)</td>
<td></td>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<a id="acfb21351bb3f0146635745bfacfe26a8" name="acfb21351bb3f0146635745bfacfe26a8"></a>
<h2 class="memtitle"><span class="permalink"><a href="#acfb21351bb3f0146635745bfacfe26a8">&#9670;&#160;</a></span>radio_init()</h2>
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<td class="memname">void radio_init </td>
<td>(</td>
<td class="paramtype">void&#160;</td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Configure the RADIO peripheral (mode, packet format, address, CRC, power). </p>
</div>
</div>
<a id="a93ad6d90796885b32326efe3b7c93b17" name="a93ad6d90796885b32326efe3b7c93b17"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a93ad6d90796885b32326efe3b7c93b17">&#9670;&#160;</a></span>radio_rx_burst()</h2>
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<td class="memname">bool radio_rx_burst </td>
<td>(</td>
<td class="paramtype"><a class="el" href="radio_8h.html#a0f54f3002fc4eaef20595ed5e64b35d7">ptt_frame_t</a> *&#160;</td>
<td class="paramname"><em>frame_out</em></td><td>)</td>
<td></td>
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<p>Receive one FHSS hop: advance channel, listen for FHSS_DWELL_MS ms. </p>
<p>If a packet with a valid CRC arrives during the dwell window, <code>frame_out</code> is filled and the function returns true. The caller should then call fhss_set_slot(frame_out-&gt;slot + 1) to synchronise the hopping sequence.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">frame_out</td><td>Destination for the received frame (must not be NULL). </td></tr>
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</dl>
<dl class="section return"><dt>Returns</dt><dd>true if a valid packet was received, false on timeout or CRC error. </dd></dl>
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<a id="a4508602c352170e18afc35ea773edb98" name="a4508602c352170e18afc35ea773edb98"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a4508602c352170e18afc35ea773edb98">&#9670;&#160;</a></span>radio_set_channel()</h2>
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<td class="memname">void radio_set_channel </td>
<td>(</td>
<td class="paramtype">uint8_t&#160;</td>
<td class="paramname"><em>ch</em></td><td>)</td>
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<p>Set the RF channel. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ch</td><td>Channel index 0-39, maps to 2400+ch MHz (MAP=0). </td></tr>
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</dd>
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<h2 class="memtitle"><span class="permalink"><a href="#aa98086e3cef509cbd1f899e79e62a39c">&#9670;&#160;</a></span>radio_tx()</h2>
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<td class="memname">void radio_tx </td>
<td>(</td>
<td class="paramtype">const uint8_t *&#160;</td>
<td class="paramname"><em>data</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t&#160;</td>
<td class="paramname"><em>len</em>&#160;</td>
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<td>)</td>
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<p>Transmit one packet synchronously. </p>
<p>Loads <code>data</code> into the internal packet buffer, asserts TASKS_TXEN, and returns after EVENTS_END fires. RADIO is DISABLED automatically via the END_DISABLE shortcut before the function returns.</p>
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<tr><td class="paramname">data</td><td>Payload bytes. </td></tr>
<tr><td class="paramname">len</td><td>Payload length (0-255 bytes). </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a797c6c01e1ad4076ab54412b8c116de2">&#9670;&#160;</a></span>radio_tx_burst()</h2>
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<p>Transmit one FHSS hop: advance channel, send PTT frame, hold dwell time. </p>
<p>Call repeatedly in a loop while the PTT button is held. Each call occupies exactly FHSS_DWELL_MS milliseconds. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a2d7a2412663c9b0521415553939b1b05">&#9670;&#160;</a></span>timer_init()</h2>
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<td class="memname">static void timer_init </td>
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<h2 class="groupheader">Variable Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a883657f0d0158e64f07b1cabb26c4233">&#9670;&#160;</a></span>pkt_buf</h2>
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<td class="memname">uint8_t pkt_buf[<a class="el" href="radio_8c.html#a6821bafc3c88dfb2e433a095df9940c6">BUF_SIZE</a>]</td>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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