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<a href="serial__receiver_8vhd.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
|
| 115 |
|
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<a name="l00003"></a>00003 <span class="vhdlkeyword">library </span><span class="keywordflow">IEEE</span>;
|
| 116 |
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|
<a name="l00004"></a>00004 <span class="vhdlkeyword">use </span>IEEE.STD_LOGIC_1164.<span class="vhdlkeyword">ALL</span>;
|
| 117 |
|
|
<a name="l00005"></a>00005
|
| 118 |
|
|
<a name="l00007"></a><a class="code" href="classserial__receiver.html#ac442dca664056131bdaf5c92e4351e01">00007</a> <span class="vhdlkeyword">use </span>work.pkgDefinitions.<span class="vhdlkeyword">all</span>;
|
| 119 |
|
|
<a name="l00008"></a>00008
|
| 120 |
|
|
<a name="l00009"></a><a class="code" href="classserial__receiver.html">00009</a> <span class="keywordflow">entity </span><a class="code" href="classserial__receiver.html">serial_receiver</a> <span class="vhdlkeyword">is</span>
|
| 121 |
|
|
<a name="l00010"></a>00010 <span class="vhdlkeyword">Port</span> <span class="vhdlchar">(</span>
|
| 122 |
|
|
<a name="l00011"></a><a class="code" href="classserial__receiver.html#ae085c8310d2bb026ba06982b4ee625ca">00011</a> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ae085c8310d2bb026ba06982b4ee625ca" title="Reset input.">rst</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">in</span> <span class="comment">STD_LOGIC</span>;
|
| 123 |
|
|
<a name="l00012"></a><a class="code" href="classserial__receiver.html#a15f70818a05c91cdc1990eab131f743d">00012</a> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a15f70818a05c91cdc1990eab131f743d" title="Baud oversampled 8x (Best way to detect start bit)">baudOverSampleClk</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">in</span> <span class="comment">STD_LOGIC</span>;
|
| 124 |
|
|
<a name="l00013"></a><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f">00013</a> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">in</span> <span class="comment">STD_LOGIC</span>;
|
| 125 |
|
|
<a name="l00014"></a><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae">00014</a> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae" title="Data received and ready to be read.">data_ready</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">out</span> <span class="comment">STD_LOGIC</span>;
|
| 126 |
|
|
<a name="l00015"></a><a class="code" href="classserial__receiver.html#a029d3624d857a6b6355d51475cc7e908">00015</a> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a029d3624d857a6b6355d51475cc7e908" title="Data byte received.">data_byte</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">out</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><span class="vhdlchar">)</span>;
|
| 127 |
|
|
<a name="l00016"></a>00016 <span class="vhdlkeyword">end</span> <span class="vhdlchar">serial_receiver</span>;
|
| 128 |
|
|
<a name="l00017"></a>00017
|
| 129 |
|
|
<a name="l00020"></a><a class="code" href="classserial__receiver_1_1_behavioral.html">00020</a> <span class="vhdlkeyword">architecture</span> Behavioral <span class="vhdlkeyword">of</span> <a class="code" href="classserial__receiver.html">serial_receiver</a> is
|
| 130 |
|
|
<a name="l00021"></a>00021 <span class="vhdlkeyword">signal</span> <span class="vhdlchar">current_s</span><span class="vhdlchar">:</span> <span class="vhdlchar">rxStates</span>;
|
| 131 |
|
|
<a name="l00022"></a>00022 <span class="vhdlkeyword">signal</span> <span class="vhdlchar">filterRx</span> <span class="vhdlchar">:</span> <span class="vhdlchar">rxFilterStates</span>;
|
| 132 |
|
|
<a name="l00023"></a>00023 <span class="vhdlkeyword">signal</span> <span class="vhdlchar">syncDetected</span> <span class="vhdlchar">:</span> <span class="comment">std_logic</span>;
|
| 133 |
|
|
<a name="l00024"></a>00024
|
| 134 |
|
|
<a name="l00025"></a>00025 <span class="vhdlkeyword">begin</span><span class="keyword"></span>
|
| 135 |
|
|
<a name="l00026"></a>00026 <span class="keyword"> -- First we need <span class="vhdlkeyword">to</span> oversample(</span><span class="vhdllogic">8x</span> baud rate) <span class="vhdlkeyword">out</span> serial channel <span class="vhdlkeyword">to</span> syncronize <span class="vhdlkeyword">with</span> the PC (By detecting the start <span class="comment">bit</span>)
|
| 136 |
|
|
<a name="l00027"></a>00027 <span class="vhdlkeyword">process</span> (<a class="code" href="classserial__receiver.html#ae085c8310d2bb026ba06982b4ee625ca" title="Reset input.">rst</a>, <a class="code" href="classserial__receiver.html#a15f70818a05c91cdc1990eab131f743d" title="Baud oversampled 8x (Best way to detect start bit)">baudOverSampleClk</a>, <a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a>, current_s)
|
| 137 |
|
|
<a name="l00028"></a>00028 <span class="vhdlkeyword"> begin</span>
|
| 138 |
|
|
<a name="l00029"></a>00029 <span class="vhdlkeyword">if</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ae085c8310d2bb026ba06982b4ee625ca" 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>
|
| 139 |
|
|
<a name="l00030"></a>00030 <span class="vhdlchar">filterRx</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">s0</span>;
|
| 140 |
|
|
<a name="l00031"></a>00031 <span class="vhdlchar">syncDetected</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 141 |
|
|
<a name="l00032"></a>00032 <span class="vhdlkeyword">elsif</span> <span class="vhdlchar">rising_edge</span><span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classserial__receiver.html#a15f70818a05c91cdc1990eab131f743d" title="Baud oversampled 8x (Best way to detect start bit)">baudOverSampleClk</a></span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
|
| 142 |
|
|
<a name="l00033"></a>00033 <span class="vhdlkeyword">case</span> <span class="vhdlchar">filterRx</span> <span class="vhdlkeyword">is</span>
|
| 143 |
|
|
<a name="l00034"></a>00034 <span class="vhdlkeyword">when</span> <span class="vhdlchar">s0</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 144 |
|
|
<a name="l00035"></a>00035 <span class="vhdlchar">syncDetected</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;<span class="keyword"></span>
|
| 145 |
|
|
<a name="l00036"></a>00036 <span class="keyword"> -- Spike down detected, verify <span class="vhdlkeyword">if</span> it's valid <span class="vhdlkeyword">for</span> at least </span><span class="vhdllogic">4</span> cycles
|
| 146 |
|
|
<a name="l00037"></a>00037 <span class="vhdlkeyword">if</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span> <span class="vhdlchar">=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span> <span class="vhdlkeyword">then</span>
|
| 147 |
|
|
<a name="l00038"></a>00038 <span class="vhdlchar">filterRx</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">s1</span>;
|
| 148 |
|
|
<a name="l00039"></a>00039 <span class="vhdlkeyword">else</span>
|
| 149 |
|
|
<a name="l00040"></a>00040 <span class="vhdlchar">filterRx</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">s0</span>;
|
| 150 |
|
|
<a name="l00041"></a>00041 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 151 |
|
|
<a name="l00042"></a>00042
|
| 152 |
|
|
<a name="l00043"></a>00043 <span class="vhdlkeyword">when</span> <span class="vhdlchar">s1</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 153 |
|
|
<a name="l00044"></a>00044 <span class="vhdlchar">syncDetected</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 154 |
|
|
<a name="l00045"></a>00045 <span class="vhdlkeyword">if</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span> <span class="vhdlchar">=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span> <span class="vhdlkeyword">then</span>
|
| 155 |
|
|
<a name="l00046"></a>00046 <span class="vhdlchar">filterRx</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">s2</span>;
|
| 156 |
|
|
<a name="l00047"></a>00047 <span class="vhdlchar">syncDetected</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 157 |
|
|
<a name="l00048"></a>00048 <span class="vhdlkeyword">else</span>
|
| 158 |
|
|
<a name="l00049"></a>00049 <span class="vhdlchar">filterRx</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">s0</span>;
|
| 159 |
|
|
<a name="l00050"></a>00050 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 160 |
|
|
<a name="l00051"></a>00051
|
| 161 |
|
|
<a name="l00052"></a>00052 <span class="vhdlkeyword">when</span> <span class="vhdlchar">s2</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 162 |
|
|
<a name="l00053"></a>00053 <span class="vhdlchar">syncDetected</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 163 |
|
|
<a name="l00054"></a>00054 <span class="vhdlkeyword">if</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span> <span class="vhdlchar">=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span> <span class="vhdlkeyword">then</span>
|
| 164 |
|
|
<a name="l00055"></a>00055 <span class="vhdlchar">filterRx</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">s3</span>;
|
| 165 |
|
|
<a name="l00056"></a>00056 <span class="vhdlchar">syncDetected</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 166 |
|
|
<a name="l00057"></a>00057 <span class="vhdlkeyword">else</span>
|
| 167 |
|
|
<a name="l00058"></a>00058 <span class="vhdlchar">filterRx</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">s0</span>;
|
| 168 |
|
|
<a name="l00059"></a>00059 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 169 |
|
|
<a name="l00060"></a>00060
|
| 170 |
|
|
<a name="l00061"></a>00061 <span class="vhdlkeyword">when</span> <span class="vhdlchar">s3</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 171 |
|
|
<a name="l00062"></a>00062 <span class="vhdlchar">syncDetected</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 172 |
|
|
<a name="l00063"></a>00063 <span class="vhdlkeyword">if</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span> <span class="vhdlchar">=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span> <span class="vhdlkeyword">then</span>
|
| 173 |
|
|
<a name="l00064"></a>00064 <span class="vhdlchar">filterRx</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">s4</span>;
|
| 174 |
|
|
<a name="l00065"></a>00065 <span class="vhdlchar">syncDetected</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 175 |
|
|
<a name="l00066"></a>00066 <span class="vhdlkeyword">else</span>
|
| 176 |
|
|
<a name="l00067"></a>00067 <span class="vhdlchar">filterRx</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">s0</span>;
|
| 177 |
|
|
<a name="l00068"></a>00068 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 178 |
|
|
<a name="l00069"></a>00069
|
| 179 |
|
|
<a name="l00070"></a>00070 <span class="vhdlkeyword">when</span> <span class="vhdlchar">s4</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span> <span class="keyword"></span>
|
| 180 |
|
|
<a name="l00071"></a>00071 <span class="keyword"> -- <span class="comment">Real</span> Beginning <span class="vhdlkeyword">of</span> start <span class="comment">bit</span> detected </span>
|
| 181 |
|
|
<a name="l00072"></a>00072 <span class="vhdlkeyword">if</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span> <span class="vhdlchar">=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span> <span class="vhdlkeyword">then</span>
|
| 182 |
|
|
<a name="l00073"></a>00073 <span class="vhdlchar">filterRx</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">s4</span>;
|
| 183 |
|
|
<a name="l00074"></a>00074 <span class="vhdlchar">syncDetected</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">'</span>;
|
| 184 |
|
|
<a name="l00075"></a>00075 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 185 |
|
|
<a name="l00076"></a>00076 <span class="keyword"></span>
|
| 186 |
|
|
<a name="l00077"></a>00077 <span class="keyword"> -- Reset <span class="vhdlkeyword">out</span> sync detector <span class="vhdlkeyword">when</span> finished <span class="vhdlkeyword">to</span> receive a byte</span>
|
| 187 |
|
|
<a name="l00078"></a>00078 <span class="vhdlkeyword">if</span> <span class="vhdlchar">current_s</span> <span class="vhdlchar">=</span> <span class="vhdlchar">rx_idle</span> <span class="vhdlkeyword">then</span>
|
| 188 |
|
|
<a name="l00079"></a>00079 <span class="vhdlchar">filterRx</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">s0</span>;
|
| 189 |
|
|
<a name="l00080"></a>00080 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 190 |
|
|
<a name="l00081"></a>00081 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">case</span>;
|
| 191 |
|
|
<a name="l00082"></a>00082 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 192 |
|
|
<a name="l00083"></a>00083 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">process</span>;
|
| 193 |
|
|
<a name="l00084"></a>00084 <span class="keyword"></span>
|
| 194 |
|
|
<a name="l00085"></a>00085 <span class="keyword"> -- <span class="vhdlkeyword">Process</span> <span class="vhdlkeyword">to</span> handle the serial receive (<span class="vhdlkeyword">On</span> this <span class="vhdlkeyword">case</span> our reset <span class="vhdlkeyword">is</span> the syncDetected <span class="vhdlkeyword">signal</span></span><span class="keyword"></span>
|
| 195 |
|
|
<a name="l00086"></a>00086 <span class="keyword"> -- Always include <span class="vhdlkeyword">all</span> <span class="vhdlkeyword">of</span> your signals <span class="vhdlkeyword">on</span> the sensivity list!! (Even <span class="vhdlkeyword">if</span> the simulation <span class="vhdlkeyword">is</span> already ok)</span>
|
| 196 |
|
|
<a name="l00087"></a>00087 <span class="vhdlkeyword">process</span> (syncDetected, <a class="code" href="classserial__receiver.html#a15f70818a05c91cdc1990eab131f743d" title="Baud oversampled 8x (Best way to detect start bit)">baudOverSampleClk</a>, <a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a>)
|
| 197 |
|
|
<a name="l00088"></a>00088 <span class="vhdlkeyword">variable</span> <span class="vhdlchar">byteReceived</span> <span class="vhdlchar">:</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>;
|
| 198 |
|
|
<a name="l00089"></a>00089 <span class="vhdlkeyword">variable</span> <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:</span> <span class="comment">integer</span> <span class="vhdlkeyword">range</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span> <span class="vhdlkeyword">to</span> <span class="vhdllogic"></span><span class="vhdllogic">10</span>;
|
| 199 |
|
|
<a name="l00090"></a>00090 <span class="vhdlkeyword">constant</span> numTicks<span class="vhdlchar">:</span> <span class="comment">integer</span> <span class="vhdlchar">:=</span> <span class="vhdllogic"></span><span class="vhdllogic">7</span>;
|
| 200 |
|
|
<a name="l00091"></a>00091 <span class="vhdlkeyword"> begin</span>
|
| 201 |
|
|
<a name="l00092"></a>00092 <span class="vhdlkeyword">if</span> <span class="vhdlchar">syncDetected</span> <span class="vhdlchar">=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span> <span class="vhdlkeyword">then</span>
|
| 202 |
|
|
<a name="l00093"></a>00093 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit0</span>;
|
| 203 |
|
|
<a name="l00094"></a>00094 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae" title="Data received and ready to be read.">data_ready</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 204 |
|
|
<a name="l00095"></a>00095 <span class="vhdlchar">byteReceived</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">(</span><span class="vhdlkeyword">others</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span><span class="vhdlchar">)</span>;
|
| 205 |
|
|
<a name="l00096"></a>00096 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span>;
|
| 206 |
|
|
<a name="l00097"></a>00097 <span class="vhdlkeyword">elsif</span> <span class="vhdlchar">rising_edge</span><span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classserial__receiver.html#a15f70818a05c91cdc1990eab131f743d" title="Baud oversampled 8x (Best way to detect start bit)">baudOverSampleClk</a></span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
|
| 207 |
|
|
<a name="l00098"></a>00098 <span class="vhdlkeyword">case</span> <span class="vhdlchar">current_s</span> <span class="vhdlkeyword">is</span>
|
| 208 |
|
|
<a name="l00099"></a>00099 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit0</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 209 |
|
|
<a name="l00100"></a>00100 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae" title="Data received and ready to be read.">data_ready</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 210 |
|
|
<a name="l00101"></a>00101 <span class="vhdlkeyword">if</span> <span class="vhdlchar">(</span><span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar"><</span> <span class="vhdlchar">numTicks</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
|
| 211 |
|
|
<a name="l00102"></a>00102 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">+</span> <span class="vhdllogic"></span><span class="vhdllogic">1</span>;
|
| 212 |
|
|
<a name="l00103"></a>00103 <span class="vhdlkeyword">else</span>
|
| 213 |
|
|
<a name="l00104"></a>00104 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span>;
|
| 214 |
|
|
<a name="l00105"></a>00105 <span class="vhdlchar">byteReceived</span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span> <span class="vhdlchar">:=</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span>;
|
| 215 |
|
|
<a name="l00106"></a>00106 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit1</span>;
|
| 216 |
|
|
<a name="l00107"></a>00107 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 217 |
|
|
<a name="l00108"></a>00108
|
| 218 |
|
|
<a name="l00109"></a>00109 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit1</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 219 |
|
|
<a name="l00110"></a>00110 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae" title="Data received and ready to be read.">data_ready</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 220 |
|
|
<a name="l00111"></a>00111 <span class="vhdlkeyword">if</span> <span class="vhdlchar">(</span><span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar"><</span> <span class="vhdlchar">numTicks</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
|
| 221 |
|
|
<a name="l00112"></a>00112 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">+</span> <span class="vhdllogic"></span><span class="vhdllogic">1</span>;
|
| 222 |
|
|
<a name="l00113"></a>00113 <span class="vhdlkeyword">else</span>
|
| 223 |
|
|
<a name="l00114"></a>00114 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span>;
|
| 224 |
|
|
<a name="l00115"></a>00115 <span class="vhdlchar">byteReceived</span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">)</span> <span class="vhdlchar">:=</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span>;
|
| 225 |
|
|
<a name="l00116"></a>00116 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit2</span>;
|
| 226 |
|
|
<a name="l00117"></a>00117 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 227 |
|
|
<a name="l00118"></a>00118
|
| 228 |
|
|
<a name="l00119"></a>00119 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit2</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 229 |
|
|
<a name="l00120"></a>00120 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae" title="Data received and ready to be read.">data_ready</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 230 |
|
|
<a name="l00121"></a>00121 <span class="vhdlkeyword">if</span> <span class="vhdlchar">(</span><span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar"><</span> <span class="vhdlchar">numTicks</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
|
| 231 |
|
|
<a name="l00122"></a>00122 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">+</span> <span class="vhdllogic"></span><span class="vhdllogic">1</span>;
|
| 232 |
|
|
<a name="l00123"></a>00123 <span class="vhdlkeyword">else</span>
|
| 233 |
|
|
<a name="l00124"></a>00124 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span>;
|
| 234 |
|
|
<a name="l00125"></a>00125 <span class="vhdlchar">byteReceived</span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">2</span><span class="vhdlchar">)</span> <span class="vhdlchar">:=</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span>;
|
| 235 |
|
|
<a name="l00126"></a>00126 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit3</span>;
|
| 236 |
|
|
<a name="l00127"></a>00127 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 237 |
|
|
<a name="l00128"></a>00128
|
| 238 |
|
|
<a name="l00129"></a>00129 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit3</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 239 |
|
|
<a name="l00130"></a>00130 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae" title="Data received and ready to be read.">data_ready</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 240 |
|
|
<a name="l00131"></a>00131 <span class="vhdlkeyword">if</span> <span class="vhdlchar">(</span><span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar"><</span> <span class="vhdlchar">numTicks</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
|
| 241 |
|
|
<a name="l00132"></a>00132 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">+</span> <span class="vhdllogic"></span><span class="vhdllogic">1</span>;
|
| 242 |
|
|
<a name="l00133"></a>00133 <span class="vhdlkeyword">else</span>
|
| 243 |
|
|
<a name="l00134"></a>00134 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span>;
|
| 244 |
|
|
<a name="l00135"></a>00135 <span class="vhdlchar">byteReceived</span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">3</span><span class="vhdlchar">)</span> <span class="vhdlchar">:=</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span>;
|
| 245 |
|
|
<a name="l00136"></a>00136 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit4</span>;
|
| 246 |
|
|
<a name="l00137"></a>00137 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 247 |
|
|
<a name="l00138"></a>00138
|
| 248 |
|
|
<a name="l00139"></a>00139 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit4</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 249 |
|
|
<a name="l00140"></a>00140 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae" title="Data received and ready to be read.">data_ready</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 250 |
|
|
<a name="l00141"></a>00141 <span class="vhdlkeyword">if</span> <span class="vhdlchar">(</span><span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar"><</span> <span class="vhdlchar">numTicks</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
|
| 251 |
|
|
<a name="l00142"></a>00142 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">+</span> <span class="vhdllogic"></span><span class="vhdllogic">1</span>;
|
| 252 |
|
|
<a name="l00143"></a>00143 <span class="vhdlkeyword">else</span>
|
| 253 |
|
|
<a name="l00144"></a>00144 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span>;
|
| 254 |
|
|
<a name="l00145"></a>00145 <span class="vhdlchar">byteReceived</span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">4</span><span class="vhdlchar">)</span> <span class="vhdlchar">:=</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span>;
|
| 255 |
|
|
<a name="l00146"></a>00146 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit5</span>;
|
| 256 |
|
|
<a name="l00147"></a>00147 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 257 |
|
|
<a name="l00148"></a>00148
|
| 258 |
|
|
<a name="l00149"></a>00149 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit5</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 259 |
|
|
<a name="l00150"></a>00150 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae" title="Data received and ready to be read.">data_ready</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 260 |
|
|
<a name="l00151"></a>00151 <span class="vhdlkeyword">if</span> <span class="vhdlchar">(</span><span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar"><</span> <span class="vhdlchar">numTicks</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
|
| 261 |
|
|
<a name="l00152"></a>00152 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">+</span> <span class="vhdllogic"></span><span class="vhdllogic">1</span>;
|
| 262 |
|
|
<a name="l00153"></a>00153 <span class="vhdlkeyword">else</span>
|
| 263 |
|
|
<a name="l00154"></a>00154 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span>;
|
| 264 |
|
|
<a name="l00155"></a>00155 <span class="vhdlchar">byteReceived</span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">5</span><span class="vhdlchar">)</span> <span class="vhdlchar">:=</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span>;
|
| 265 |
|
|
<a name="l00156"></a>00156 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit6</span>;
|
| 266 |
|
|
<a name="l00157"></a>00157 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 267 |
|
|
<a name="l00158"></a>00158
|
| 268 |
|
|
<a name="l00159"></a>00159 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit6</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 269 |
|
|
<a name="l00160"></a>00160 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae" title="Data received and ready to be read.">data_ready</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 270 |
|
|
<a name="l00161"></a>00161 <span class="vhdlkeyword">if</span> <span class="vhdlchar">(</span><span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar"><</span> <span class="vhdlchar">numTicks</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
|
| 271 |
|
|
<a name="l00162"></a>00162 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">+</span> <span class="vhdllogic"></span><span class="vhdllogic">1</span>;
|
| 272 |
|
|
<a name="l00163"></a>00163 <span class="vhdlkeyword">else</span>
|
| 273 |
|
|
<a name="l00164"></a>00164 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span>;
|
| 274 |
|
|
<a name="l00165"></a>00165 <span class="vhdlchar">byteReceived</span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">6</span><span class="vhdlchar">)</span> <span class="vhdlchar">:=</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span>;
|
| 275 |
|
|
<a name="l00166"></a>00166 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">bit7</span>;
|
| 276 |
|
|
<a name="l00167"></a>00167 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 277 |
|
|
<a name="l00168"></a>00168
|
| 278 |
|
|
<a name="l00169"></a>00169 <span class="vhdlkeyword">when</span> <span class="vhdlchar">bit7</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 279 |
|
|
<a name="l00170"></a>00170 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae" title="Data received and ready to be read.">data_ready</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
|
| 280 |
|
|
<a name="l00171"></a>00171 <span class="vhdlkeyword">if</span> <span class="vhdlchar">(</span><span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar"><</span> <span class="vhdlchar">numTicks</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
|
| 281 |
|
|
<a name="l00172"></a>00172 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">+</span> <span class="vhdllogic"></span><span class="vhdllogic">1</span>;
|
| 282 |
|
|
<a name="l00173"></a>00173 <span class="vhdlkeyword">else</span>
|
| 283 |
|
|
<a name="l00174"></a>00174 <span class="vhdlchar">waitBestPoint</span> <span class="vhdlchar">:=</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span>;
|
| 284 |
|
|
<a name="l00175"></a>00175 <span class="vhdlchar">byteReceived</span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">7</span><span class="vhdlchar">)</span> <span class="vhdlchar">:=</span> <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a387303c39d306a2506581b02f261dc2f" title="Uart serial input.">serial_in</a></span>;
|
| 285 |
|
|
<a name="l00176"></a>00176 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a029d3624d857a6b6355d51475cc7e908" title="Data byte received.">data_byte</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">byteReceived</span>;
|
| 286 |
|
|
<a name="l00177"></a>00177 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">rx_stop</span>;
|
| 287 |
|
|
<a name="l00178"></a>00178 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 288 |
|
|
<a name="l00179"></a>00179
|
| 289 |
|
|
<a name="l00180"></a>00180 <span class="vhdlkeyword">when</span> <span class="vhdlchar">rx_stop</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 290 |
|
|
<a name="l00181"></a>00181 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae" title="Data received and ready to be read.">data_ready</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">'</span>;
|
| 291 |
|
|
<a name="l00182"></a>00182 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a029d3624d857a6b6355d51475cc7e908" title="Data byte received.">data_byte</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">byteReceived</span>;
|
| 292 |
|
|
<a name="l00183"></a>00183 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">rx_idle</span>;
|
| 293 |
|
|
<a name="l00184"></a>00184
|
| 294 |
|
|
<a name="l00185"></a>00185 <span class="vhdlkeyword">when</span> <span class="vhdlchar">rx_idle</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span>
|
| 295 |
|
|
<a name="l00186"></a>00186 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#ac62bb0a9882c4e28633c87d94f2de2ae" title="Data received and ready to be read.">data_ready</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">'</span>;
|
| 296 |
|
|
<a name="l00187"></a>00187 <span class="vhdlchar"><a class="code" href="classserial__receiver.html#a029d3624d857a6b6355d51475cc7e908" title="Data byte received.">data_byte</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">byteReceived</span>;
|
| 297 |
|
|
<a name="l00188"></a>00188 <span class="vhdlchar">current_s</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">rx_idle</span>;
|
| 298 |
|
|
<a name="l00189"></a>00189 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">case</span>;
|
| 299 |
|
|
<a name="l00190"></a>00190 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
|
| 300 |
|
|
<a name="l00191"></a>00191 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">process</span>;
|
| 301 |
|
|
<a name="l00192"></a>00192
|
| 302 |
|
|
<a name="l00193"></a>00193 <span class="vhdlkeyword">end</span> <span class="vhdlchar">Behavioral</span>;
|
| 303 |
|
|
<a name="l00194"></a>00194
|
| 304 |
|
|
</pre></div></div><!-- contents -->
|
| 305 |
|
|
</div>
|
| 306 |
|
|
<div id="nav-path" class="navpath">
|
| 307 |
|
|
<ul>
|
| 308 |
|
|
<li class="navelem"><a class="el" href="serial__receiver_8vhd.html">serial_receiver.vhd</a> </li>
|
| 309 |
|
|
|
| 310 |
|
|
<li class="footer">Generated on Sat May 12 2012 22:28:05 for Uart wishbone slave Documentation by
|
| 311 |
|
|
<a href="http://www.doxygen.org/index.html">
|
| 312 |
|
|
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.0 </li>
|
| 313 |
|
|
</ul>
|
| 314 |
|
|
</div>
|
| 315 |
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|
| 316 |
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|
| 317 |
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|
</body>
|
| 318 |
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</html>
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