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Viktor Reusch
2025-09-12 15:55:45 +02:00
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<div class="headertitle"><div class="title">uart_base.h</div></div>
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<div class="contents">
<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/*</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> * Copyright (C) 2009-2012 Technische Universität Dresden.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * Copyright (C) 2023-2024 Kernkonzept GmbH.</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> * Author(s): Adam Lackorzynski &lt;adam@os.inf.tu-dresden.de&gt;</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> *</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> * License: see LICENSE.spdx (in this directory or the directories above)</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> */</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span> </div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#include &lt;stddef.h&gt;</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="preprocessor">#include &lt;l4/drivers/io_regblock.h&gt;</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span> </div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="preprocessor">#include &quot;poll_timeout_counter.h&quot;</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span> </div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceL4.html">L4</a> {</div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span></div>
<div class="foldopen" id="foldopen00020" data-start="{" data-end="};">
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"><a class="line" href="classL4_1_1Uart.html"> 20</a></span><span class="keyword">class </span>Uart</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span>{</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="keyword">protected</span>:</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> <span class="keywordtype">unsigned</span> _mode;</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> <span class="keywordtype">unsigned</span> _rate;</div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> Io_register_block <span class="keyword">const</span> *_regs;</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> <span class="keywordtype">void</span> *<span class="keyword">operator</span> <span class="keyword">new</span> (size_t, <span class="keywordtype">void</span>* a)</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> { <span class="keywordflow">return</span> a; }</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> </div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> Transfer_mode;</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">typedef</span> <span class="keywordtype">unsigned</span> Baud_rate;</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> Uart()</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> : _mode(~0U), _rate(~0U)</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> {}</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"><a class="line" href="classL4_1_1Uart.html#acc5eb31138d00f87b3b7944cdae93b04"> 46</a></span> <span class="keyword">virtual</span> <span class="keywordtype">bool</span> <a class="code hl_function" href="classL4_1_1Uart.html#acc5eb31138d00f87b3b7944cdae93b04">startup</a>(Io_register_block <span class="keyword">const</span> *regs) = 0;</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> </div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keyword">virtual</span> ~Uart() {}</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"><a class="line" href="classL4_1_1Uart.html#a4e88a8c8695bd7903ac37a7d3f75e207"> 53</a></span> <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code hl_function" href="classL4_1_1Uart.html#a4e88a8c8695bd7903ac37a7d3f75e207">shutdown</a>() = 0;</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"><a class="line" href="classL4_1_1Uart.html#ac70a395c14b85b77b9d824c54e005bdb"> 66</a></span> <span class="keyword">virtual</span> <span class="keywordtype">bool</span> <a class="code hl_function" href="classL4_1_1Uart.html#ac70a395c14b85b77b9d824c54e005bdb">change_mode</a>(Transfer_mode m, Baud_rate r) = 0;</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"><a class="line" href="classL4_1_1Uart.html#a1080fa44a12850cd38c7eb851eb74f6f"> 78</a></span> <span class="keyword">virtual</span> <span class="keywordtype">int</span> <a class="code hl_function" href="classL4_1_1Uart.html#a1080fa44a12850cd38c7eb851eb74f6f">write</a>(<span class="keywordtype">char</span> <span class="keyword">const</span> *s, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> count,</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="keywordtype">bool</span> blocking = <span class="keyword">true</span>) <span class="keyword">const</span> = 0;</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"><a class="line" href="classL4_1_1Uart.html#afb3b03d44d8f32d5d90d01bba89c0760"> 86</a></span> Transfer_mode <a class="code hl_function" href="classL4_1_1Uart.html#afb3b03d44d8f32d5d90d01bba89c0760">mode</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> _mode; }</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"><a class="line" href="classL4_1_1Uart.html#a86a4f246ca4c5f0ef1d4720d27bfd52c"> 93</a></span> Baud_rate <a class="code hl_function" href="classL4_1_1Uart.html#a86a4f246ca4c5f0ef1d4720d27bfd52c">rate</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> _rate; }</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> </div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"><a class="line" href="classL4_1_1Uart.html#af141560f01c73565fcaa38bda79105b7"> 103</a></span> <span class="keyword">virtual</span> <span class="keywordtype">bool</span> <a class="code hl_function" href="classL4_1_1Uart.html#af141560f01c73565fcaa38bda79105b7">enable_rx_irq</a>(<span class="keywordtype">bool</span> = <span class="keyword">true</span>) { <span class="keywordflow">return</span> <span class="keyword">false</span>; }</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"><a class="line" href="classL4_1_1Uart.html#a0f7c45243d84a69dcb4e58c80fc34491"> 108</a></span> <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code hl_function" href="classL4_1_1Uart.html#a0f7c45243d84a69dcb4e58c80fc34491">irq_ack</a>() {}</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"><a class="line" href="classL4_1_1Uart.html#aa44d60597fcc30a084bd4491075210c6"> 116</a></span> <span class="keyword">virtual</span> <span class="keywordtype">int</span> <a class="code hl_function" href="classL4_1_1Uart.html#aa44d60597fcc30a084bd4491075210c6">char_avail</a>() <span class="keyword">const</span> = 0;</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"><a class="line" href="classL4_1_1Uart.html#af213c9429844ea7713be765513619902"> 126</a></span> <span class="keyword">virtual</span> <span class="keywordtype">int</span> <a class="code hl_function" href="classL4_1_1Uart.html#af213c9429844ea7713be765513619902">get_char</a>(<span class="keywordtype">bool</span> blocking = <span class="keyword">true</span>) <span class="keyword">const</span> = 0;</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> </div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span><span class="keyword">protected</span>:</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Uart_driver, <span class="keywordtype">bool</span> Timeout_guard = true&gt;</div>
<div class="foldopen" id="foldopen00141" data-start="{" data-end="}">
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"><a class="line" href="classL4_1_1Uart.html#a1cef9f55c568d5197d1b676e34c4bfd2"> 141</a></span> <span class="keywordtype">int</span> <a class="code hl_function" href="classL4_1_1Uart.html#a1cef9f55c568d5197d1b676e34c4bfd2">generic_write</a>(<span class="keywordtype">char</span> <span class="keyword">const</span> *s, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> count,</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> <span class="keywordtype">bool</span> blocking = <span class="keyword">true</span>)<span class="keyword"> const</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span><span class="keyword"> </span>{</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> <span class="keyword">auto</span> *self = <span class="keyword">static_cast&lt;</span>Uart_driver const*<span class="keyword">&gt;</span>(<span class="keyword">this</span>);</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> </div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> c;</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> <span class="keywordflow">for</span> (c = 0; c &lt; count; ++c)</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> {</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> <span class="keywordflow">if</span> (!blocking &amp;&amp; !self-&gt;tx_avail())</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> </div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> <span class="keywordflow">if</span> <span class="keyword">constexpr</span> (Timeout_guard)</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> {</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> <a class="code hl_class" href="classL4_1_1Poll__timeout__counter.html">Poll_timeout_counter</a> i(3000000);</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> <span class="keywordflow">while</span> (i.<a class="code hl_function" href="classL4_1_1Poll__timeout__counter.html#a962cff68b1bd6f4ebc520d541c0316bf">test</a>(!self-&gt;tx_avail()))</div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> ;</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> }</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> {</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> <span class="keywordflow">while</span> (!self-&gt;tx_avail())</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> ;</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> }</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> </div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> self-&gt;out_char(*s++);</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> }</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> </div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> <span class="keywordflow">if</span> (blocking)</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> self-&gt;wait_tx_done();</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> </div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> <span class="keywordflow">return</span> c;</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> }</div>
</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span>};</div>
</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> </div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span>} <span class="comment">// namespace L4</span></div>
<div class="ttc" id="aclassL4_1_1Poll__timeout__counter_html"><div class="ttname"><a href="classL4_1_1Poll__timeout__counter.html">L4::Poll_timeout_counter</a></div><div class="ttdoc">Evaluate an expression for a maximum number of times.</div><div class="ttdef"><b>Definition</b> <a href="poll__timeout__counter_8h_source.html#l00034">poll_timeout_counter.h:35</a></div></div>
<div class="ttc" id="aclassL4_1_1Poll__timeout__counter_html_a962cff68b1bd6f4ebc520d541c0316bf"><div class="ttname"><a href="classL4_1_1Poll__timeout__counter.html#a962cff68b1bd6f4ebc520d541c0316bf">L4::Poll_timeout_counter::test</a></div><div class="ttdeci">bool test(bool expression=true)</div><div class="ttdoc">Evaluate the expression for a maximum number of times.</div><div class="ttdef"><b>Definition</b> <a href="poll__timeout__counter_8h_source.html#l00061">poll_timeout_counter.h:61</a></div></div>
<div class="ttc" id="aclassL4_1_1Uart_html_a0f7c45243d84a69dcb4e58c80fc34491"><div class="ttname"><a href="classL4_1_1Uart.html#a0f7c45243d84a69dcb4e58c80fc34491">L4::Uart::irq_ack</a></div><div class="ttdeci">virtual void irq_ack()</div><div class="ttdoc">Acknowledge a received interrupt.</div><div class="ttdef"><b>Definition</b> <a href="#l00108">uart_base.h:108</a></div></div>
<div class="ttc" id="aclassL4_1_1Uart_html_a1080fa44a12850cd38c7eb851eb74f6f"><div class="ttname"><a href="classL4_1_1Uart.html#a1080fa44a12850cd38c7eb851eb74f6f">L4::Uart::write</a></div><div class="ttdeci">virtual int write(char const *s, unsigned long count, bool blocking=true) const =0</div><div class="ttdoc">Transmit a number of characters.</div></div>
<div class="ttc" id="aclassL4_1_1Uart_html_a1cef9f55c568d5197d1b676e34c4bfd2"><div class="ttname"><a href="classL4_1_1Uart.html#a1cef9f55c568d5197d1b676e34c4bfd2">L4::Uart::generic_write</a></div><div class="ttdeci">int generic_write(char const *s, unsigned long count, bool blocking=true) const</div><div class="ttdoc">Internal function transmitting each character one-after-another and finally waiting that the transmis...</div><div class="ttdef"><b>Definition</b> <a href="#l00141">uart_base.h:141</a></div></div>
<div class="ttc" id="aclassL4_1_1Uart_html_a4e88a8c8695bd7903ac37a7d3f75e207"><div class="ttname"><a href="classL4_1_1Uart.html#a4e88a8c8695bd7903ac37a7d3f75e207">L4::Uart::shutdown</a></div><div class="ttdeci">virtual void shutdown()=0</div><div class="ttdoc">Terminate the UART driver.</div></div>
<div class="ttc" id="aclassL4_1_1Uart_html_a86a4f246ca4c5f0ef1d4720d27bfd52c"><div class="ttname"><a href="classL4_1_1Uart.html#a86a4f246ca4c5f0ef1d4720d27bfd52c">L4::Uart::rate</a></div><div class="ttdeci">Baud_rate rate() const</div><div class="ttdoc">Return the baud rate.</div><div class="ttdef"><b>Definition</b> <a href="#l00093">uart_base.h:93</a></div></div>
<div class="ttc" id="aclassL4_1_1Uart_html_aa44d60597fcc30a084bd4491075210c6"><div class="ttname"><a href="classL4_1_1Uart.html#aa44d60597fcc30a084bd4491075210c6">L4::Uart::char_avail</a></div><div class="ttdeci">virtual int char_avail() const =0</div><div class="ttdoc">Check if there is at least one character available for reading from the UART.</div></div>
<div class="ttc" id="aclassL4_1_1Uart_html_ac70a395c14b85b77b9d824c54e005bdb"><div class="ttname"><a href="classL4_1_1Uart.html#ac70a395c14b85b77b9d824c54e005bdb">L4::Uart::change_mode</a></div><div class="ttdeci">virtual bool change_mode(Transfer_mode m, Baud_rate r)=0</div><div class="ttdoc">Set certain parameters of the UART.</div></div>
<div class="ttc" id="aclassL4_1_1Uart_html_acc5eb31138d00f87b3b7944cdae93b04"><div class="ttname"><a href="classL4_1_1Uart.html#acc5eb31138d00f87b3b7944cdae93b04">L4::Uart::startup</a></div><div class="ttdeci">virtual bool startup(Io_register_block const *regs)=0</div><div class="ttdoc">Start the UART driver.</div></div>
<div class="ttc" id="aclassL4_1_1Uart_html_af141560f01c73565fcaa38bda79105b7"><div class="ttname"><a href="classL4_1_1Uart.html#af141560f01c73565fcaa38bda79105b7">L4::Uart::enable_rx_irq</a></div><div class="ttdeci">virtual bool enable_rx_irq(bool=true)</div><div class="ttdoc">Enable the receive IRQ.</div><div class="ttdef"><b>Definition</b> <a href="#l00103">uart_base.h:103</a></div></div>
<div class="ttc" id="aclassL4_1_1Uart_html_af213c9429844ea7713be765513619902"><div class="ttname"><a href="classL4_1_1Uart.html#af213c9429844ea7713be765513619902">L4::Uart::get_char</a></div><div class="ttdeci">virtual int get_char(bool blocking=true) const =0</div><div class="ttdoc">Read a character from the UART.</div></div>
<div class="ttc" id="aclassL4_1_1Uart_html_afb3b03d44d8f32d5d90d01bba89c0760"><div class="ttname"><a href="classL4_1_1Uart.html#afb3b03d44d8f32d5d90d01bba89c0760">L4::Uart::mode</a></div><div class="ttdeci">Transfer_mode mode() const</div><div class="ttdoc">Return the transfer mode.</div><div class="ttdef"><b>Definition</b> <a href="#l00086">uart_base.h:86</a></div></div>
<div class="ttc" id="anamespaceL4_html"><div class="ttname"><a href="namespaceL4.html">L4</a></div><div class="ttdoc">L4 low-level kernel interface.</div><div class="ttdef"><b>Definition</b> <a href="l4sys-l4f-groups_8dox_source.html#l00050">l4sys-l4f-groups.dox:50</a></div></div>
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<li class="navelem"><b>pkg</b></li><li class="navelem"><b>drivers-frst</b></li><li class="navelem"><b>uart</b></li><li class="navelem"><b>include</b></li><li class="navelem"><b>uart_base.h</b></li>
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