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<div class="section" id="system">
<h1>System<a class="headerlink" href="#system" title="Permalink to this headline"></a></h1>
<p>A hardware independent interface for starting and resetting the system.</p>
<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline"></a></h2>
<p>The API allows the user to detect whether a debugger is connected,
sissue a soft reset, and enumerate the reset causes. The functions are
implemented in the MCU specific directories e.g. <code class="docutils literal notranslate"><span class="pre">hal_reset_cause.c</span></code>,
<code class="docutils literal notranslate"><span class="pre">hal_system.c</span></code>, and <code class="docutils literal notranslate"><span class="pre">hal_system_start.c</span></code> in
<code class="docutils literal notranslate"><span class="pre">/hw/mcu/nordic/nrf52xxx/src/</span></code> directory for Nordic nRF52 series of
chips.</p>
</div>
<div class="section" id="api">
<h2>API<a class="headerlink" href="#api" title="Permalink to this headline"></a></h2>
<dl class="c enum">
<dt id="c.hal_reset_reason">
<span class="target" id="group___h_a_l_system_1ga09b5ea025a6a638b45a7276b1e572924"></span><em class="property"><span class="pre">enum</span> </em><code class="sig-name descname"><span class="pre">hal_reset_reason</span></code><a class="headerlink" href="#c.hal_reset_reason" title="Permalink to this definition"></a><br /></dt>
<dd><p>Reboot reason. </p>
<p><em>Values:</em></p>
<dl class="c enumerator">
<dt id="c.hal_reset_reason.HAL_RESET_POR">
<span class="target" id="group___h_a_l_system_1gga09b5ea025a6a638b45a7276b1e572924a0f0d1b68f623da5384b142a5ffef142a"></span><em class="property"><span class="pre">enumerator</span> </em><code class="sig-name descname"><span class="pre">HAL_RESET_POR</span></code><a class="headerlink" href="#c.hal_reset_reason.HAL_RESET_POR" title="Permalink to this definition"></a><br /></dt>
<dd><p>Power on Reset. </p>
</dd></dl>
<dl class="c enumerator">
<dt id="c.hal_reset_reason.HAL_RESET_PIN">
<span class="target" id="group___h_a_l_system_1gga09b5ea025a6a638b45a7276b1e572924a8d2581c07d1dfde7244d5b09ecfdd1ce"></span><em class="property"><span class="pre">enumerator</span> </em><code class="sig-name descname"><span class="pre">HAL_RESET_PIN</span></code><a class="headerlink" href="#c.hal_reset_reason.HAL_RESET_PIN" title="Permalink to this definition"></a><br /></dt>
<dd><p>Caused by Reset Pin. </p>
</dd></dl>
<dl class="c enumerator">
<dt id="c.hal_reset_reason.HAL_RESET_WATCHDOG">
<span class="target" id="group___h_a_l_system_1gga09b5ea025a6a638b45a7276b1e572924a69a2e98907a3824bd58513a162940a84"></span><em class="property"><span class="pre">enumerator</span> </em><code class="sig-name descname"><span class="pre">HAL_RESET_WATCHDOG</span></code><a class="headerlink" href="#c.hal_reset_reason.HAL_RESET_WATCHDOG" title="Permalink to this definition"></a><br /></dt>
<dd><p>Caused by Watchdog. </p>
</dd></dl>
<dl class="c enumerator">
<dt id="c.hal_reset_reason.HAL_RESET_SOFT">
<span class="target" id="group___h_a_l_system_1gga09b5ea025a6a638b45a7276b1e572924abb5acfff3c2b181ad87a781918ca5526"></span><em class="property"><span class="pre">enumerator</span> </em><code class="sig-name descname"><span class="pre">HAL_RESET_SOFT</span></code><a class="headerlink" href="#c.hal_reset_reason.HAL_RESET_SOFT" title="Permalink to this definition"></a><br /></dt>
<dd><p>Soft reset, either system reset or crash. </p>
</dd></dl>
<dl class="c enumerator">
<dt id="c.hal_reset_reason.HAL_RESET_BROWNOUT">
<span class="target" id="group___h_a_l_system_1gga09b5ea025a6a638b45a7276b1e572924a54dd29c8d0eb2b272bde3294a2e48a3c"></span><em class="property"><span class="pre">enumerator</span> </em><code class="sig-name descname"><span class="pre">HAL_RESET_BROWNOUT</span></code><a class="headerlink" href="#c.hal_reset_reason.HAL_RESET_BROWNOUT" title="Permalink to this definition"></a><br /></dt>
<dd><p>Low supply voltage. </p>
</dd></dl>
<dl class="c enumerator">
<dt id="c.hal_reset_reason.HAL_RESET_REQUESTED">
<span class="target" id="group___h_a_l_system_1gga09b5ea025a6a638b45a7276b1e572924abf3b4b4329a9afc456c43f9ceb227dd3"></span><em class="property"><span class="pre">enumerator</span> </em><code class="sig-name descname"><span class="pre">HAL_RESET_REQUESTED</span></code><a class="headerlink" href="#c.hal_reset_reason.HAL_RESET_REQUESTED" title="Permalink to this definition"></a><br /></dt>
<dd><p>Restart due to user request. </p>
</dd></dl>
<dl class="c enumerator">
<dt id="c.hal_reset_reason.HAL_RESET_SYS_OFF_INT">
<span class="target" id="group___h_a_l_system_1gga09b5ea025a6a638b45a7276b1e572924ae0db49386dd85a656183ade38b5a12a9"></span><em class="property"><span class="pre">enumerator</span> </em><code class="sig-name descname"><span class="pre">HAL_RESET_SYS_OFF_INT</span></code><a class="headerlink" href="#c.hal_reset_reason.HAL_RESET_SYS_OFF_INT" title="Permalink to this definition"></a><br /></dt>
<dd><p>System Off, wakeup on external interrupt. </p>
</dd></dl>
<dl class="c enumerator">
<dt id="c.hal_reset_reason.HAL_RESET_DFU">
<span class="target" id="group___h_a_l_system_1gga09b5ea025a6a638b45a7276b1e572924ac10c0a17643bf69c79cff80b33b644d8"></span><em class="property"><span class="pre">enumerator</span> </em><code class="sig-name descname"><span class="pre">HAL_RESET_DFU</span></code><a class="headerlink" href="#c.hal_reset_reason.HAL_RESET_DFU" title="Permalink to this definition"></a><br /></dt>
<dd><p>Restart due to DFU. </p>
</dd></dl>
<dl class="c enumerator">
<dt id="c.hal_reset_reason.HAL_RESET_OTHER">
<span class="target" id="group___h_a_l_system_1gga09b5ea025a6a638b45a7276b1e572924a7c1b6821f010c4d9f2f74465a246fb51"></span><em class="property"><span class="pre">enumerator</span> </em><code class="sig-name descname"><span class="pre">HAL_RESET_OTHER</span></code><a class="headerlink" href="#c.hal_reset_reason.HAL_RESET_OTHER" title="Permalink to this definition"></a><br /></dt>
<dd><p>Restart reason other. </p>
</dd></dl>
</dd></dl>
<dl class="c function">
<dt>
<span class="target" id="group___h_a_l_system_1ga298b06e8955f8c64886e851dffe2dd96"></span><code class="sig-name descname"><span class="pre">void</span> <span class="pre">hal_system_reset</span> <span class="pre">(void)</span> <span class="pre">__attribute((noreturn))</span></code></dt>
<dd><p>System reset. </p>
</dd></dl>
<dl class="c function">
<dt>
<span class="target" id="group___h_a_l_system_1ga0edf69888576dcebf13be54592322286"></span><code class="sig-name descname"><span class="pre">void</span> <span class="pre">hal_system_start</span> <span class="pre">(void</span> <span class="pre">*img_start)</span> <span class="pre">__attribute((noreturn))</span></code></dt>
<dd><p>Called by bootloader to start loaded program. </p>
</dd></dl>
<dl class="c function">
<dt>
<span class="target" id="group___h_a_l_system_1ga98fc967d38f29dd2c1388ccdf13f0fe5"></span><code class="sig-name descname"><span class="pre">void</span> <span class="pre">hal_system_restart</span> <span class="pre">(void</span> <span class="pre">*img_start)</span> <span class="pre">__attribute((noreturn))</span></code></dt>
<dd><p>Called by split app loader to start the app program. </p>
</dd></dl>
<dl class="c function">
<dt id="c.hal_debugger_connected">
<span class="target" id="group___h_a_l_system_1gad043ab91f977ec307638f6ecc309dfdb"></span><span class="pre">int</span> <code class="sig-name descname"><span class="pre">hal_debugger_connected</span></code><span class="sig-paren">(</span><span class="pre">void</span><span class="sig-paren">)</span><a class="headerlink" href="#c.hal_debugger_connected" title="Permalink to this definition"></a><br /></dt>
<dd><p>Returns non-zero if there is a HW debugger attached. </p>
</dd></dl>
<dl class="c function">
<dt id="c.hal_reset_cause">
<span class="target" id="group___h_a_l_system_1gaa5c34b0ed27b5b987eac78702c671854"></span><em class="property"><span class="pre">enum</span></em> <a class="reference internal" href="#c.hal_reset_reason" title="hal_reset_reason"><span class="pre">hal_reset_reason</span></a> <code class="sig-name descname"><span class="pre">hal_reset_cause</span></code><span class="sig-paren">(</span><span class="pre">void</span><span class="sig-paren">)</span><a class="headerlink" href="#c.hal_reset_cause" title="Permalink to this definition"></a><br /></dt>
<dd><p>Return the reboot reason. </p>
<p><dl class="simple">
<dt><strong>Return</strong></dt><dd><p>A reboot reason </p>
</dd>
</dl>
</p>
</dd></dl>
<dl class="c function">
<dt id="c.hal_reset_cause_str">
<span class="target" id="group___h_a_l_system_1ga3a5baa89a77180b7b72185134e3c2cf1"></span><em class="property"><span class="pre">const</span></em> <span class="pre">char</span> <span class="pre">*</span><code class="sig-name descname"><span class="pre">hal_reset_cause_str</span></code><span class="sig-paren">(</span><span class="pre">void</span><span class="sig-paren">)</span><a class="headerlink" href="#c.hal_reset_cause_str" title="Permalink to this definition"></a><br /></dt>
<dd><p>Return the reboot reason as a string. </p>
<p><dl class="simple">
<dt><strong>Return</strong></dt><dd><p>String describing previous reset reason </p>
</dd>
</dl>
</p>
</dd></dl>
<dl class="c function">
<dt id="c.hal_system_clock_start">
<span class="target" id="group___h_a_l_system_1ga40d3f16e48773bf0c4cfa7b79b31b6f8"></span><span class="pre">void</span> <code class="sig-name descname"><span class="pre">hal_system_clock_start</span></code><span class="sig-paren">(</span><span class="pre">void</span><span class="sig-paren">)</span><a class="headerlink" href="#c.hal_system_clock_start" title="Permalink to this definition"></a><br /></dt>
<dd><p>Starts clocks needed by system. </p>
</dd></dl>
<dl class="c function">
<dt id="c.hal_system_reset_cb">
<span class="target" id="group___h_a_l_system_1ga210966833f4ac91398f350456f80ee06"></span><span class="pre">void</span> <code class="sig-name descname"><span class="pre">hal_system_reset_cb</span></code><span class="sig-paren">(</span><span class="pre">void</span><span class="sig-paren">)</span><a class="headerlink" href="#c.hal_system_reset_cb" title="Permalink to this definition"></a><br /></dt>
<dd><p>Reset callback to be called before an reset happens inside <a class="reference internal" href="#group___h_a_l_system_1ga298b06e8955f8c64886e851dffe2dd96"><span class="std std-ref">hal_system_reset()</span></a> </p>
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