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<a href="serial__transmitter_8vhd.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
<a name="l00003"></a>00003 <span class="vhdlkeyword">library </span><span class="keywordflow">IEEE</span>;
<a name="l00004"></a>00004 <span class="vhdlkeyword">use </span>IEEE.STD_LOGIC_1164.<span class="vhdlkeyword">ALL</span>;
<a name="l00005"></a>00005
<a name="l00007"></a><a class="code" href="classserial__transmitter.html#ac442dca664056131bdaf5c92e4351e01">00007</a> <span class="vhdlkeyword">use </span>work.pkgDefinitions.<span class="vhdlkeyword">all</span>;
<a name="l00008"></a>00008
<a name="l00009"></a><a class="code" href="classserial__transmitter.html">00009</a> <span class="keywordflow">entity </span><a class="code" href="classserial__transmitter.html">serial_transmitter</a> <span class="vhdlkeyword">is</span>
<a name="l00010"></a><a class="code" href="classserial__transmitter.html#a69a21b2223906c06964e170ed8472b60">00010</a> <span class="vhdlkeyword">Port</span> <span class="vhdlchar">(</span> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a69a21b2223906c06964e170ed8472b60" title="Reset input.">rst</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">in</span> <span class="comment">STD_LOGIC</span>;
<a name="l00011"></a><a class="code" href="classserial__transmitter.html#a37deab9bf997cca5bdba26c411a2c051">00011</a> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a37deab9bf997cca5bdba26c411a2c051" title="Baud rate clock input.">baudClk</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">in</span> <span class="comment">STD_LOGIC</span>;
<a name="l00012"></a><a class="code" href="classserial__transmitter.html#ab901c30d3e4ea5dec40e2cbcd7d9db54">00012</a> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ab901c30d3e4ea5dec40e2cbcd7d9db54" title="Byte to be sent.">data_byte</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">in</span> <span class="comment">STD_LOGIC_VECTOR</span> <span class="vhdlchar">(</span><span class="vhdlchar">(</span><span class="vhdlchar">nBits</span><span class="vhdlchar">-</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">downto</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span>;
<a name="l00013"></a><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73">00013</a> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">out</span> <span class="comment">STD_LOGIC</span>;
<a name="l00014"></a><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de">00014</a> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">out</span> <span class="comment">STD_LOGIC</span><span class="vhdlchar">)</span>;
<a name="l00015"></a>00015 <span class="vhdlkeyword">end</span> <span class="vhdlchar">serial_transmitter</span>;
<a name="l00016"></a>00016
<a name="l00019"></a><a class="code" href="classserial__transmitter_1_1_behavioral.html">00019</a> <span class="vhdlkeyword">architecture</span> Behavioral <span class="vhdlkeyword">of</span> <a class="code" href="classserial__transmitter.html">serial_transmitter</a> is
<a name="l00020"></a>00020 <span class="vhdlkeyword">signal</span> <span class="vhdlchar">current_s</span><span class="vhdlchar">,</span><span class="vhdlchar">next_s</span><span class="vhdlchar">:</span> <span class="vhdlchar">txStates</span>;
<a name="l00021"></a>00021 <span class="vhdlkeyword">begin</span>
<a name="l00022"></a>00022 <span class="keyword"></span>
<a name="l00023"></a>00023 <span class="keyword"> -- <span class="vhdlkeyword">Next</span> state <span class="vhdlkeyword">process</span></span>
<a name="l00024"></a>00024 <span class="vhdlkeyword">process</span> (<a class="code" href="classserial__transmitter.html#a69a21b2223906c06964e170ed8472b60" title="Reset input.">rst</a>, <a class="code" href="classserial__transmitter.html#a37deab9bf997cca5bdba26c411a2c051" title="Baud rate clock input.">baudClk</a>)
<a name="l00025"></a>00025 <span class="vhdlkeyword"> begin</span>
<a name="l00026"></a>00026 <span class="vhdlkeyword">if</span> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a69a21b2223906c06964e170ed8472b60" title="Reset input.">rst</a></span> <span class="vhdlchar">=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">'</span> <span class="vhdlkeyword">then</span>
<a name="l00027"></a>00027 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">tx_idle</span>;
<a name="l00028"></a>00028 <span class="vhdlkeyword">elsif</span> <span class="vhdlchar">rising_edge</span><span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a37deab9bf997cca5bdba26c411a2c051" title="Baud rate clock input.">baudClk</a></span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
<a name="l00029"></a>00029 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">next_s</span>;
<a name="l00030"></a>00030 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
<a name="l00031"></a>00031 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">process</span>;
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="vhdlkeyword">process</span> (current_s, <a class="code" href="classserial__transmitter.html#ab901c30d3e4ea5dec40e2cbcd7d9db54" title="Byte to be sent.">data_byte</a>)
<a name="l00034"></a>00034 <span class="vhdlkeyword"> begin</span>
<a name="l00035"></a>00035 <span class="vhdlkeyword">case</span> <span class="vhdlchar">current_s</span> <span class="vhdlkeyword">is</span>
<a name="l00036"></a>00036 <span class="vhdlkeyword">when</span> <span class="vhdlchar">tx_idle</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
<a name="l00037"></a>00037 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">'</span>;
<a name="l00038"></a>00038 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
<a name="l00039"></a>00039 <span class="vhdlchar">next_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">tx_start</span>;
<a name="l00040"></a>00040 <span class="keyword"></span>
<a name="l00041"></a>00041 <span class="keyword"> -- Start <span class="comment">bit</span></span>
<a name="l00042"></a>00042 <span class="vhdlkeyword">when</span> <span class="vhdlchar">tx_start</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
<a name="l00043"></a>00043 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
<a name="l00044"></a>00044 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
<a name="l00045"></a>00045 <span class="vhdlchar">next_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit0</span>;
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit0</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span><span class="keyword"> -- Send the least significat <span class="comment">bit</span></span>
<a name="l00048"></a>00048 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ab901c30d3e4ea5dec40e2cbcd7d9db54" title="Byte to be sent.">data_byte</a></span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span>;
<a name="l00049"></a>00049 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
<a name="l00050"></a>00050 <span class="vhdlchar">next_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit1</span>;
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit1</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
<a name="l00053"></a>00053 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ab901c30d3e4ea5dec40e2cbcd7d9db54" title="Byte to be sent.">data_byte</a></span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">)</span>;
<a name="l00054"></a>00054 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
<a name="l00055"></a>00055 <span class="vhdlchar">next_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit2</span>;
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit2</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
<a name="l00058"></a>00058 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ab901c30d3e4ea5dec40e2cbcd7d9db54" title="Byte to be sent.">data_byte</a></span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">2</span><span class="vhdlchar">)</span>;
<a name="l00059"></a>00059 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
<a name="l00060"></a>00060 <span class="vhdlchar">next_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit3</span>;
<a name="l00061"></a>00061
<a name="l00062"></a>00062 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit3</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
<a name="l00063"></a>00063 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ab901c30d3e4ea5dec40e2cbcd7d9db54" title="Byte to be sent.">data_byte</a></span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">3</span><span class="vhdlchar">)</span>;
<a name="l00064"></a>00064 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
<a name="l00065"></a>00065 <span class="vhdlchar">next_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit4</span>;
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit4</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
<a name="l00068"></a>00068 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ab901c30d3e4ea5dec40e2cbcd7d9db54" title="Byte to be sent.">data_byte</a></span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">4</span><span class="vhdlchar">)</span>;
<a name="l00069"></a>00069 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
<a name="l00070"></a>00070 <span class="vhdlchar">next_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit5</span>;
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit5</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
<a name="l00073"></a>00073 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ab901c30d3e4ea5dec40e2cbcd7d9db54" title="Byte to be sent.">data_byte</a></span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">5</span><span class="vhdlchar">)</span>;
<a name="l00074"></a>00074 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
<a name="l00075"></a>00075 <span class="vhdlchar">next_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit6</span>;
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit6</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
<a name="l00078"></a>00078 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ab901c30d3e4ea5dec40e2cbcd7d9db54" title="Byte to be sent.">data_byte</a></span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">6</span><span class="vhdlchar">)</span>;
<a name="l00079"></a>00079 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
<a name="l00080"></a>00080 <span class="vhdlchar">next_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit7</span>;
<a name="l00081"></a>00081
<a name="l00082"></a>00082 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit7</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span><span class="keyword"> -- Send the most significat <span class="comment">bit</span></span>
<a name="l00083"></a>00083 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ab901c30d3e4ea5dec40e2cbcd7d9db54" title="Byte to be sent.">data_byte</a></span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">7</span><span class="vhdlchar">)</span>;
<a name="l00084"></a>00084 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
<a name="l00085"></a>00085 <span class="vhdlchar">next_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">tx_stop1</span>;
<a name="l00086"></a>00086
<a name="l00087"></a>00087
<a name="l00088"></a>00088 <span class="vhdlkeyword">when</span> <span class="vhdlchar">tx_stop1</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
<a name="l00089"></a>00089 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">'</span>;
<a name="l00090"></a>00090 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">'</span>;
<a name="l00091"></a>00091 <span class="vhdlchar">next_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">tx_stop2</span>;
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="vhdlkeyword">when</span> <span class="vhdlchar">tx_stop2</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span><span class="keyword"> -- Stop here <span class="vhdlkeyword">and</span> <span class="vhdlkeyword">wait</span> <span class="vhdlkeyword">for</span> other reset</span>
<a name="l00094"></a>00094 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#ac65328ce72c56f359addcc4876d091de" title="Uart serial output.">serial_out</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">'</span>;
<a name="l00095"></a>00095 <span class="vhdlchar"><a class="code" href="classserial__transmitter.html#a5bd0a4b084d0e368d77bac41cc143a73" title="Indicate that byte has been sent.">data_sent</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">'</span>;
<a name="l00096"></a>00096 <span class="vhdlchar">next_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">tx_stop2</span>;
<a name="l00097"></a>00097
<a name="l00098"></a>00098 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">case</span>;
<a name="l00099"></a>00099 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">process</span>;
<a name="l00100"></a>00100
<a name="l00101"></a>00101 <span class="vhdlkeyword">end</span> <span class="vhdlchar">Behavioral</span>;
<a name="l00102"></a>00102
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