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<div id="projectname">SSD1306 OLED display driver
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 <span id="projectnumber">1.8.2</span>
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<div id="projectbrief">This library is developed to control SSD1306/SSD1331/SSD1351/IL9163/PCD8554 RGB i2c/spi LED displays</div>
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<div class="title">ssd1306_uart.c</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> MIT License</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"></span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> Copyright (c) 2018, Alexey Dynda</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"></span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> Permission is hereby granted, free of charge, to any person obtaining a copy</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> of this software and associated documentation files (the "Software"), to deal</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> in the Software without restriction, including without limitation the rights</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> copies of the Software, and to permit persons to whom the Software is</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> furnished to do so, subject to the following conditions:</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"></span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> The above copyright notice and this permission notice shall be included in all</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> copies or substantial portions of the Software.</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"></span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> SOFTWARE.</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">*/</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include "<a class="code" href="ssd1306__uart_8h.html">ssd1306_uart.h</a>"</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#if defined(CONFIG_AVR_UART_AVAILABLE) && defined(CONFIG_AVR_UART_ENABLE)</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="keyword">volatile</span> uint8_t g_uart_put_ptr = 0;</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">volatile</span> uint8_t g_uart_buf[<a class="code" href="ssd1306__uart_8h.html#adff6f1691b8119f8c50293135a28e1b3">UART_BUFFER_RX</a>];</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="keyword">static</span> uint8_t s_uart_get_ptr = 0;</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="keyword">static</span> uint8_t s_uart_interrupt = 0;</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#undef BAUD</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#define BAUD 115200</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">// We need to define BAUD_TOL too high, because otherwise,</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">// the compiler will give a warning "Baud rate achieved is higher than allowed"</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment">// I would recommend not to use 115200 on atmega328p</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#define BAUD_TOL 4</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#include <util/setbaud.h></span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0h_115200 = UBRRH_VALUE;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0l_115200 = UBRRL_VALUE;</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor">#ifdef USE_2X</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_115200 = 1;</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_115200 = 0;</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor">#undef BAUD</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor">#define BAUD 57600</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor">#include <util/setbaud.h></span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0h_57600 = UBRRH_VALUE;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0l_57600 = UBRRL_VALUE;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor">#ifdef USE_2X</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_57600 = 1;</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_57600 = 0;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor">#undef BAUD</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor">#define BAUD 38400</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor">#include <util/setbaud.h></span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0h_38400 = UBRRH_VALUE;</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0l_38400 = UBRRL_VALUE;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="preprocessor">#ifdef USE_2X</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_38400 = 1;</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_38400 = 0;</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="preprocessor">#undef BAUD</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="preprocessor">#define BAUD 19200</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="preprocessor">#include <util/setbaud.h></span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0h_19200 = UBRRH_VALUE;</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0l_19200 = UBRRL_VALUE;</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor">#ifdef USE_2X</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_19200 = 1;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_19200 = 0;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="keywordtype">void</span> uart_init_internal(uint32_t baud, uint8_t interrupt)</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> {</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  s_uart_interrupt = interrupt;</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">switch</span> (baud)</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  {</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">case</span> 19200:</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  UBRR0H = ubrr0h_19200;</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  UBRR0L = ubrr0l_19200;</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">if</span> (u2x0_19200) UCSR0A |= _BV(U2X0); <span class="keywordflow">else</span> UCSR0A &= ~(_BV(U2X0));</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">case</span> 38400:</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  UBRR0H = ubrr0h_38400;</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  UBRR0L = ubrr0l_38400;</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">if</span> (u2x0_38400) UCSR0A |= _BV(U2X0); <span class="keywordflow">else</span> UCSR0A &= ~(_BV(U2X0));</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">case</span> 57600:</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  UBRR0H = ubrr0h_57600;</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  UBRR0L = ubrr0l_57600;</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">if</span> (u2x0_57600) UCSR0A |= _BV(U2X0); <span class="keywordflow">else</span> UCSR0A &= ~(_BV(U2X0));</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">case</span> 115200:</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  UBRR0H = ubrr0h_115200;</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  UBRR0L = ubrr0l_115200;</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">if</span> (u2x0_115200) UCSR0A |= _BV(U2X0); <span class="keywordflow">else</span> UCSR0A &= ~(_BV(U2X0));</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">default</span>:</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  }</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); <span class="comment">/* 8-bit data */</span></div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  UCSR0B = _BV(RXEN0) | _BV(TXEN0) | (s_uart_interrupt ? _BV(RXCIE0) : 0);</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> }</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span> </div><div class="line"><a name="l00117"></a><span class="lineno"><a class="line" href="ssd1306__uart_8h.html#a0a6add2293e47c6adb4070dcafb77991"> 117</a></span> <span class="keywordtype">void</span> <a class="code" href="ssd1306__uart_8h.html#a0a6add2293e47c6adb4070dcafb77991">uart_send_byte</a>(uint8_t c)</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> {</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  loop_until_bit_is_set(UCSR0A, UDRE0); <span class="comment">/* Wait until data register empty. */</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  UDR0 = c;</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> }</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="keyword">static</span> <span class="keyword">inline</span> uint8_t uart_byte_available_direct(<span class="keywordtype">void</span>)</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> {</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">return</span> bit_is_set(UCSR0A, RXC0);</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> }</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div><div class="line"><a name="l00128"></a><span class="lineno"><a class="line" href="ssd1306__uart_8h.html#a9303a912df9a76702c17750f3f0a5bf0"> 128</a></span> uint8_t <a class="code" href="ssd1306__uart_8h.html#a9303a912df9a76702c17750f3f0a5bf0">uart_byte_available</a>(<span class="keywordtype">void</span>)</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> {</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">if</span> (!s_uart_interrupt)</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  {</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">while</span> (uart_byte_available_direct()) __uart_read_byte();</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  }</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">return</span> g_uart_put_ptr != s_uart_get_ptr;</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> }</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div><div class="line"><a name="l00137"></a><span class="lineno"><a class="line" href="ssd1306__uart_8h.html#a8cd92b6cf3b75bf832242080a7dbe6c2"> 137</a></span> uint8_t <a class="code" href="ssd1306__uart_8h.html#a8cd92b6cf3b75bf832242080a7dbe6c2">uart_read_byte</a>(<span class="keywordtype">void</span>)</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> {</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  uint8_t data = g_uart_buf[s_uart_get_ptr];</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  s_uart_get_ptr = (s_uart_get_ptr + 1) & (<a class="code" href="ssd1306__uart_8h.html#adff6f1691b8119f8c50293135a28e1b3">UART_BUFFER_RX</a> - 1);</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordflow">return</span> data;</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> }</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> </div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> </div><div class="ttc" id="ssd1306__uart_8h_html_adff6f1691b8119f8c50293135a28e1b3"><div class="ttname"><a href="ssd1306__uart_8h.html#adff6f1691b8119f8c50293135a28e1b3">UART_BUFFER_RX</a></div><div class="ttdeci">#define UART_BUFFER_RX</div><div class="ttdef"><b>Definition:</b> <a href="ssd1306__uart_8h_source.html#l00049">ssd1306_uart.h:49</a></div></div>
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<div class="ttc" id="ssd1306__uart_8h_html_a8cd92b6cf3b75bf832242080a7dbe6c2"><div class="ttname"><a href="ssd1306__uart_8h.html#a8cd92b6cf3b75bf832242080a7dbe6c2">uart_read_byte</a></div><div class="ttdeci">uint8_t uart_read_byte(void)</div><div class="ttdoc">Reads byte from UART RX buffer. </div><div class="ttdef"><b>Definition:</b> <a href="ssd1306__uart_8c_source.html#l00137">ssd1306_uart.c:137</a></div></div>
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<div class="ttc" id="ssd1306__uart_8h_html_a9303a912df9a76702c17750f3f0a5bf0"><div class="ttname"><a href="ssd1306__uart_8h.html#a9303a912df9a76702c17750f3f0a5bf0">uart_byte_available</a></div><div class="ttdeci">uint8_t uart_byte_available(void)</div><div class="ttdoc">Returns non-zero code if there are bytes in RX buffer. </div><div class="ttdef"><b>Definition:</b> <a href="ssd1306__uart_8c_source.html#l00128">ssd1306_uart.c:128</a></div></div>
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<div class="ttc" id="ssd1306__uart_8h_html"><div class="ttname"><a href="ssd1306__uart_8h.html">ssd1306_uart.h</a></div></div>
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<div class="ttc" id="ssd1306__uart_8h_html_a0a6add2293e47c6adb4070dcafb77991"><div class="ttname"><a href="ssd1306__uart_8h.html#a0a6add2293e47c6adb4070dcafb77991">uart_send_byte</a></div><div class="ttdeci">void uart_send_byte(uint8_t c)</div><div class="ttdoc">Sends single byte over UART. </div><div class="ttdef"><b>Definition:</b> <a href="ssd1306__uart_8c_source.html#l00117">ssd1306_uart.c:117</a></div></div>
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