平头哥RVB2601测评:web播放器
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<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:华文细黑"><span style="color:#000000"> RVB2601 通过 I2S 和 I2C 总线连接 ES8156 DAC 芯片，将数字信号转化模拟信号后传给 PA，实现音频输出 <font face="华文细黑">。</font>I2C是配置一些参数用的，I2S是音频数据输出，跟SPI类似，速度快。</span></span></span></span></strong></p>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:华文细黑"><span style="color:#000000">DAC芯片用的是ES8156，后面还有一个PA功放CS8122来驱动喇叭。</span></span></span></span></strong></p>
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<p style="text-align:justify"><strong><span style="font-size:24px;"> <span style="font-family:Calibri"><span style="font-family:宋体">ES8156<font face="宋体">是一个双通道数字转模拟音频</font>DAC<font face="宋体">芯片</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">特点：</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•<font face="宋体">高性能和低功耗多</font><font face="Calibri"></font><font face="宋体">位</font><font face="Calibri">delta-sigma</font><font face="宋体">音频</font><font face="Calibri">DAC</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•110 dB<font face="宋体">信噪比，</font><font face="Calibri">-80 dB(THD + N</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•24<font face="宋体">位，</font><font face="Calibri">8</font><font face="宋体">至</font><font face="Calibri">96 kHz</font><font face="宋体">采样频率</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•<font face="宋体">集成耳机驱动与无电容的选择</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•<font face="宋体">差分输出更高的信噪比和</font><font face="Calibri">CMRR</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•I2S/PCM<font face="宋体">主或从串口数据端口</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•256/384Fs, USB 12/24 MHz<font face="宋体">等</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri"><font face="宋体">非标准音频系统时钟</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•I2C<font face="宋体">接口</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•7<font face="宋体">波段完全可调</font><font face="Calibri">EQ</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•<font face="宋体">动态范围压缩</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•<font face="宋体">回放信号反馈</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•<font face="宋体">弹出和点击噪音抑制</font></span></span></span></strong></p>
<p style="text-align:justify"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:Calibri">•1.8V<font face="宋体">至</font><font face="Calibri">3.3V</font><font face="宋体">操作</font></span></span></span></strong></p>
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<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">可以看到我们有几个是用户命令：</font></span></span></span></strong></p>
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<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">用</font>ifconfig ap ssid psk<font face="宋体">连接</font><font face="Calibri">wifi</font><font face="宋体">：</font></span></span></span></strong></p>
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<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">然后测试一下播放器</font>player play welcom <font face="宋体">就是播放欢迎声音</font></span></span></span></strong></p>
<p style="text-align:left"><strong><span style="font-size:24px;"><span style="font-family:Calibri"><span style="font-family:宋体"><font face="宋体">这个是他的源数据：</font></span></span></span></strong></p>
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<p>楼主介绍的 RVB2601 通过 I2S 和 I2C 总线连接 ES8156 DAC 芯片，将数字信号转化模拟信号后传给 PA，实现音频输出 ，，，</p>
<p>这个I2S则针对数字音频信号传输协议，而I2C协议可以用GPIO口软件来模拟。</p>
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