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&#160;<span id="projectnumber">0.4</span>
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<div class="title">fifo.c</div> </div>
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<a href="fifo_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/**************************************************************************/</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="comment">/**************************************************************************/</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="fifo_8h.html">fifo.h</a>&quot;</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;<span class="comment">//static inline void mutex_lock (fifo_t* f) ATTR_ALWAYS_INLINE;</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;<span class="comment">//static inline void mutex_unlock (fifo_t* f) ATTR_ALWAYS_INLINE;</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;<span class="preprocessor">#define mutex_lock(f)</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define mutex_unlock(f)</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="fifo_8c.html#a35624814c7f50eb445f8ff27460c03c6">is_fifo_initalized</a>(<a class="code" href="structfifo__t.html">fifo_t</a>* f) <a class="code" href="group___group___func_attr.html#ga18a61fcb06b815274b12b7f626993ac6">ATTR_ALWAYS_INLINE</a>;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;<span class="comment">/**************************************************************************/</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;<span class="comment">/**************************************************************************/</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"><a class="line" href="group__group__fifo.html#gad1b3c074f899149ff9736bf80d869f99"> 65</a></span>&#160;<span class="keywordtype">bool</span> <a class="code" href="group__group__fifo.html#gad1b3c074f899149ff9736bf80d869f99">fifo_read</a>(<a class="code" href="structfifo__t.html">fifo_t</a>* f, <span class="keywordtype">void</span> * p_buffer)</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;{</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="keywordflow">if</span>( !<a class="code" href="fifo_8c.html#a35624814c7f50eb445f8ff27460c03c6">is_fifo_initalized</a>(f) || fifo_is_empty(f) )</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; {</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; }</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; mutex_lock(f);</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; memcpy(p_buffer,</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; f-&gt;<a class="code" href="group__group__fifo.html#ga209cb9cecab36517780818f791fd4cb1">buffer</a> + (f-&gt;<a class="code" href="group__group__fifo.html#ga85e6a7b1738f3f627cab6ff605ec0fa6">rd_idx</a> * f-&gt;<a class="code" href="group__group__fifo.html#gad20fcdaf91880e1eadac74f44ca810af">item_size</a>),</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; f-&gt;<a class="code" href="group__group__fifo.html#gad20fcdaf91880e1eadac74f44ca810af">item_size</a>);</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; f-&gt;<a class="code" href="group__group__fifo.html#ga85e6a7b1738f3f627cab6ff605ec0fa6">rd_idx</a> = (f-&gt;<a class="code" href="group__group__fifo.html#ga85e6a7b1738f3f627cab6ff605ec0fa6">rd_idx</a> + 1) % f-&gt;<a class="code" href="group__group__fifo.html#ga826355f44678c1fda92ad8dd8768c741">depth</a>;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; f-&gt;<a class="code" href="group__group__fifo.html#gacf3bcd17dde685a9fe185401f6158094">count</a>--;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; mutex_unlock(f);</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;}</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;<span class="comment">/**************************************************************************/</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160;<span class="comment">/**************************************************************************/</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"><a class="line" href="group__group__fifo.html#ga9189952c6b2516777f06cdfcbb45d6b8"> 102</a></span>&#160;<span class="keywordtype">bool</span> <a class="code" href="group__group__fifo.html#ga9189952c6b2516777f06cdfcbb45d6b8">fifo_write</a>(<a class="code" href="structfifo__t.html">fifo_t</a>* f, <span class="keywordtype">void</span> <span class="keyword">const</span> * p_data)</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;{</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; <span class="keywordflow">if</span> ( !<a class="code" href="fifo_8c.html#a35624814c7f50eb445f8ff27460c03c6">is_fifo_initalized</a>(f) || (fifo_is_full(f) &amp;&amp; !f-&gt;overwritable) )</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; {</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; }</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; mutex_lock(f);</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; memcpy( f-&gt;<a class="code" href="group__group__fifo.html#ga209cb9cecab36517780818f791fd4cb1">buffer</a> + (f-&gt;<a class="code" href="group__group__fifo.html#ga1183877201abc773ede7d0fd7bff02be">wr_idx</a> * f-&gt;<a class="code" href="group__group__fifo.html#gad20fcdaf91880e1eadac74f44ca810af">item_size</a>),</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; p_data,</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; f-&gt;<a class="code" href="group__group__fifo.html#gad20fcdaf91880e1eadac74f44ca810af">item_size</a>);</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; f-&gt;<a class="code" href="group__group__fifo.html#ga1183877201abc773ede7d0fd7bff02be">wr_idx</a> = (f-&gt;<a class="code" href="group__group__fifo.html#ga1183877201abc773ede7d0fd7bff02be">wr_idx</a> + 1) % f-&gt;<a class="code" href="group__group__fifo.html#ga826355f44678c1fda92ad8dd8768c741">depth</a>;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160;</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; if (fifo_is_full(f))</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; {</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; f-&gt;<a class="code" href="group__group__fifo.html#ga85e6a7b1738f3f627cab6ff605ec0fa6">rd_idx</a> = f-&gt;<a class="code" href="group__group__fifo.html#ga1183877201abc773ede7d0fd7bff02be">wr_idx</a>; <span class="comment">// keep the full state (rd == wr &amp;&amp; len = size)</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; }<span class="keywordflow">else</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; {</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; f-&gt;<a class="code" href="group__group__fifo.html#gacf3bcd17dde685a9fe185401f6158094">count</a>++;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; }</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; mutex_unlock(f);</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160;}</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160;</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160;<span class="comment">/**************************************************************************/</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160;<span class="comment">/**************************************************************************/</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"><a class="line" href="group__group__fifo.html#gaec337b950afaa3d427e3793b98fe591c"> 138</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="group__group__fifo.html#gaec337b950afaa3d427e3793b98fe591c">fifo_clear</a>(<a class="code" href="structfifo__t.html">fifo_t</a> *f)</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160;{</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; mutex_lock(f);</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160;</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160; f-&gt;<a class="code" href="group__group__fifo.html#ga85e6a7b1738f3f627cab6ff605ec0fa6">rd_idx</a> = f-&gt;<a class="code" href="group__group__fifo.html#ga1183877201abc773ede7d0fd7bff02be">wr_idx</a> = f-&gt;<a class="code" href="group__group__fifo.html#gacf3bcd17dde685a9fe185401f6158094">count</a> = 0;</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; mutex_unlock(f);</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160;}</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160;</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160;<span class="comment">//--------------------------------------------------------------------+</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160;<span class="comment">// HELPER FUNCTIONS</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160;<span class="comment">//--------------------------------------------------------------------+</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160;</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160;<span class="comment">/**************************************************************************/</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160;<span class="comment">/**************************************************************************/</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160;<span class="comment">//static inline void mutex_lock (fifo_t* f)</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160;<span class="comment">//{</span></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160;<span class="comment">// if (f-&gt;irq &gt; 0)</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160;<span class="comment">// {</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160;<span class="comment">// #if !defined (_TEST_)</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160;<span class="comment">// NVIC_DisableIRQ(f-&gt;irq);</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160;<span class="comment">// #endif</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160;<span class="comment">// }</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160;<span class="comment">//}</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160;</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160;<span class="comment">/**************************************************************************/</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160;<span class="comment">/**************************************************************************/</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160;<span class="comment">//static inline void mutex_unlock (fifo_t* f)</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160;<span class="comment">//{</span></div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160;<span class="comment">// if (f-&gt;irq &gt; 0)</span></div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160;<span class="comment">// {</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160;<span class="comment">// #if !defined (_TEST_)</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160;<span class="comment">// NVIC_EnableIRQ(f-&gt;irq);</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160;<span class="comment">// #endif</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160;<span class="comment">// }</span></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160;<span class="comment">//}</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160;</div>
<div class="line"><a name="l00188"></a><span class="lineno"><a class="line" href="fifo_8c.html#a35624814c7f50eb445f8ff27460c03c6"> 188</a></span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="fifo_8c.html#a35624814c7f50eb445f8ff27460c03c6">is_fifo_initalized</a>(<a class="code" href="structfifo__t.html">fifo_t</a>* f)</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160;{</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160; <span class="keywordflow">return</span> !( f-&gt;<a class="code" href="group__group__fifo.html#ga209cb9cecab36517780818f791fd4cb1">buffer</a> == NULL || f-&gt;<a class="code" href="group__group__fifo.html#ga826355f44678c1fda92ad8dd8768c741">depth</a> == 0 || f-&gt;<a class="code" href="group__group__fifo.html#gad20fcdaf91880e1eadac74f44ca810af">item_size</a> == 0);</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160;}</div>
<div class="ttc" id="fifo_8c_html_a35624814c7f50eb445f8ff27460c03c6"><div class="ttname"><a href="fifo_8c.html#a35624814c7f50eb445f8ff27460c03c6">is_fifo_initalized</a></div><div class="ttdeci">static bool is_fifo_initalized(fifo_t *f) ATTR_ALWAYS_INLINE</div><div class="ttdoc">Disables the IRQ specified in the FIFO&#39;s &#39;irq&#39; field to prevent reads/write issues with interrupts...</div><div class="ttdef"><b>Definition:</b> <a href="fifo_8c_source.html#l00188">fifo.c:188</a></div></div>
<div class="ttc" id="group__group__fifo_html_ga85e6a7b1738f3f627cab6ff605ec0fa6"><div class="ttname"><a href="group__group__fifo.html#ga85e6a7b1738f3f627cab6ff605ec0fa6">fifo_t::rd_idx</a></div><div class="ttdeci">volatile uint16_t rd_idx</div><div class="ttdoc">read pointer </div><div class="ttdef"><b>Definition:</b> <a href="fifo_8h_source.html#l00062">fifo.h:62</a></div></div>
<div class="ttc" id="group__group__fifo_html_ga826355f44678c1fda92ad8dd8768c741"><div class="ttname"><a href="group__group__fifo.html#ga826355f44678c1fda92ad8dd8768c741">fifo_t::depth</a></div><div class="ttdeci">uint16_t const depth</div><div class="ttdoc">max items </div><div class="ttdef"><b>Definition:</b> <a href="fifo_8h_source.html#l00058">fifo.h:58</a></div></div>
<div class="ttc" id="group__group__fifo_html_gad20fcdaf91880e1eadac74f44ca810af"><div class="ttname"><a href="group__group__fifo.html#gad20fcdaf91880e1eadac74f44ca810af">fifo_t::item_size</a></div><div class="ttdeci">uint16_t const item_size</div><div class="ttdoc">size of each item </div><div class="ttdef"><b>Definition:</b> <a href="fifo_8h_source.html#l00059">fifo.h:59</a></div></div>
<div class="ttc" id="group__group__fifo_html_gaec337b950afaa3d427e3793b98fe591c"><div class="ttname"><a href="group__group__fifo.html#gaec337b950afaa3d427e3793b98fe591c">fifo_clear</a></div><div class="ttdeci">void fifo_clear(fifo_t *f)</div><div class="ttdoc">Clear the fifo read and write pointers and set length to zero. </div><div class="ttdef"><b>Definition:</b> <a href="fifo_8c_source.html#l00138">fifo.c:138</a></div></div>
<div class="ttc" id="group__group__fifo_html_ga9189952c6b2516777f06cdfcbb45d6b8"><div class="ttname"><a href="group__group__fifo.html#ga9189952c6b2516777f06cdfcbb45d6b8">fifo_write</a></div><div class="ttdeci">bool fifo_write(fifo_t *f, void const *p_data)</div><div class="ttdoc">Write one byte into the RX buffer. </div><div class="ttdef"><b>Definition:</b> <a href="fifo_8c_source.html#l00102">fifo.c:102</a></div></div>
<div class="ttc" id="group__group__fifo_html_gad1b3c074f899149ff9736bf80d869f99"><div class="ttname"><a href="group__group__fifo.html#gad1b3c074f899149ff9736bf80d869f99">fifo_read</a></div><div class="ttdeci">bool fifo_read(fifo_t *f, void *p_buffer)</div><div class="ttdoc">Read one byte out of the RX buffer. </div><div class="ttdef"><b>Definition:</b> <a href="fifo_8c_source.html#l00065">fifo.c:65</a></div></div>
<div class="ttc" id="group__group__fifo_html_ga1183877201abc773ede7d0fd7bff02be"><div class="ttname"><a href="group__group__fifo.html#ga1183877201abc773ede7d0fd7bff02be">fifo_t::wr_idx</a></div><div class="ttdeci">volatile uint16_t wr_idx</div><div class="ttdoc">write pointer </div><div class="ttdef"><b>Definition:</b> <a href="fifo_8h_source.html#l00061">fifo.h:61</a></div></div>
<div class="ttc" id="group__group__fifo_html_ga209cb9cecab36517780818f791fd4cb1"><div class="ttname"><a href="group__group__fifo.html#ga209cb9cecab36517780818f791fd4cb1">fifo_t::buffer</a></div><div class="ttdeci">uint8_t *const buffer</div><div class="ttdoc">buffer pointer </div><div class="ttdef"><b>Definition:</b> <a href="fifo_8h_source.html#l00057">fifo.h:57</a></div></div>
<div class="ttc" id="fifo_8h_html"><div class="ttname"><a href="fifo_8h.html">fifo.h</a></div></div>
<div class="ttc" id="structfifo__t_html"><div class="ttname"><a href="structfifo__t.html">fifo_t</a></div><div class="ttdoc">Simple Circular FIFO. </div><div class="ttdef"><b>Definition:</b> <a href="fifo_8h_source.html#l00055">fifo.h:55</a></div></div>
<div class="ttc" id="group___group___func_attr_html_ga18a61fcb06b815274b12b7f626993ac6"><div class="ttname"><a href="group___group___func_attr.html#ga18a61fcb06b815274b12b7f626993ac6">ATTR_ALWAYS_INLINE</a></div><div class="ttdeci">#define ATTR_ALWAYS_INLINE</div><div class="ttdoc">Generally, functions are not inlined unless optimization is specified. For functions declared inline...</div><div class="ttdef"><b>Definition:</b> <a href="compiler__gcc_8h_source.html#l00089">compiler_gcc.h:89</a></div></div>
<div class="ttc" id="group__group__fifo_html_gacf3bcd17dde685a9fe185401f6158094"><div class="ttname"><a href="group__group__fifo.html#gacf3bcd17dde685a9fe185401f6158094">fifo_t::count</a></div><div class="ttdeci">volatile uint16_t count</div><div class="ttdoc">number of items in queue </div><div class="ttdef"><b>Definition:</b> <a href="fifo_8h_source.html#l00060">fifo.h:60</a></div></div>
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