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nrf24_audio_tx_8pde-example.html

nrf24_audio_tx_8pde-example.html 8.8 KB
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    40. 

  40. <div class="title">nrf24_audio_tx.pde</div>  </div>
    41. 

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    42. 

  42. <div class="contents">
    43. 

  43. <p>Example sketch showing how to create an audio digital transmitter with the <a class="el" href="classNRF24.html" title="Send and receive addressed, reliable, acknowledged datagrams by nRF24L01. ">NRF24</a> class. Connect a 1Vp-p audio sigal to analog input 0, connected through a 1uF capacitor Works with the nrf24_audio_rx sample receiver The audio quality is poor: dont expect hi-fi!</p>
    44. 

  44. <p>This code sends about 250 messages per second, each with 32 8 bit samples from analog input 0 It uses the NRF4 in NOACK mode. The receiver never acknowledges or replies Tested on UNO</p>
    45. 

  45. <div class="fragment"><div class="line"><span class="comment">// nrf24_audio_tx.pde</span></div>
    46. 

  46. <div class="line"><span class="comment">// -*- mode: C++ -*-</span></div>
    47. 

  47. <div class="line"><span class="comment">// Example sketch showing how to create an audio digital transmitter </span></div>
    48. 

  48. <div class="line"><span class="comment">// with the NRF24 class. </span></div>
    49. 

  49. <div class="line"><span class="comment">// Connect a 1Vp-p audio sigal to analog input 0, connected through a 1uF capacitor</span></div>
    50. 

  50. <div class="line"><span class="comment">// Works with the nrf24_audio_rx sample receiver</span></div>
    51. 

  51. <div class="line"><span class="comment">// The audio quality is poor: dont expect hi-fi!</span></div>
    52. 

  52. <div class="line"><span class="comment">//</span></div>
    53. 

  53. <div class="line"><span class="comment">// This code sends about 250 messages per second, each with 32 8 bit samples from analog input 0</span></div>
    54. 

  54. <div class="line"><span class="comment">// It uses the NRF4 in NOACK mode. The receiver never acknowledges or replies</span></div>
    55. 

  55. <div class="line"><span class="comment">// Tested on UNO</span></div>
    56. 

  56. <div class="line"></div>
    57. 

  57. <div class="line"><span class="preprocessor">#include &lt;NRF24.h&gt;</span></div>
    58. 

  58. <div class="line"><span class="preprocessor">#include &lt;SPI.h&gt;</span></div>
    59. 

  59. <div class="line"></div>
    60. 

  60. <div class="line"></div>
    61. 

  61. <div class="line"><span class="comment">// Singleton instance of the radio</span></div>
    62. 

  62. <div class="line"><a name="_a0"></a><a class="code" href="classNRF24.html">NRF24</a> nrf24;</div>
    63. 

  63. <div class="line"><span class="comment">// NRF24 nrf24(8, 7); // use this to be electrically compatible with Mirf</span></div>
    64. 

  64. <div class="line"><span class="comment">// NRF24 nrf24(8, 10);// For Leonardo, need explicit SS pin</span></div>
    65. 

  65. <div class="line"></div>
    66. 

  66. <div class="line"><span class="keywordtype">void</span> setup() </div>
    67. 

  67. <div class="line">{</div>
    68. 

  68. <div class="line">  Serial.begin(9600);</div>
    69. 

  69. <div class="line">  <span class="keywordflow">while</span> (!Serial) </div>
    70. 

  70. <div class="line">    ; <span class="comment">// wait for serial port to connect. Needed for Leonardo only</span></div>
    71. 

  71. <div class="line">  <span class="keywordflow">if</span> (!nrf24.<a name="a1"></a><a class="code" href="classNRF24.html#a6e98cf508939240c1805245170a995f6">init</a>())</div>
    72. 

  72. <div class="line">    Serial.println(<span class="stringliteral">&quot;NRF24 init failed&quot;</span>);</div>
    73. 

  73. <div class="line">  <span class="keywordflow">if</span> (!nrf24.<a name="a2"></a><a class="code" href="classNRF24.html#a3fa90005f98eb2744a533899f9b7e023">setChannel</a>(1))</div>
    74. 

  74. <div class="line">    Serial.println(<span class="stringliteral">&quot;setChannel failed&quot;</span>);</div>
    75. 

  75. <div class="line">  <span class="keywordflow">if</span> (!nrf24.<a name="a3"></a><a class="code" href="classNRF24.html#adb2fbd1d1aadaad1e9b268508149b6c8">setPayloadSize</a>(32))</div>
    76. 

  76. <div class="line">    Serial.println(<span class="stringliteral">&quot;setPayloadSize failed&quot;</span>);</div>
    77. 

  77. <div class="line">  <span class="keywordflow">if</span> (!nrf24.<a name="a4"></a><a class="code" href="classNRF24.html#a3453db8390d5be4aa99d8c7fde3062a4">setRF</a>(<a name="a5"></a><a class="code" href="classNRF24.html#a52d7af9188397d4a6f5dab55d4f04742aca0c89dd1b40bdc57b7026d8da54de9a">NRF24::NRF24DataRate2Mbps</a>, <a name="a6"></a><a class="code" href="classNRF24.html#a8386e81a9a4b824ab26e785879684c7eacef1d6c037e276e6dadaff2b6056ec0c">NRF24::NRF24TransmitPower0dBm</a>))</div>
    78. 

  78. <div class="line">    Serial.println(<span class="stringliteral">&quot;setRF failed&quot;</span>);    </div>
    79. 

  79. <div class="line">  <span class="comment">// Enable the EN_DYN_ACK feature so we can use noack</span></div>
    80. 

  80. <div class="line">  nrf24.<a name="a7"></a><a class="code" href="classNRF24.html#a81931bc1679b213b1cb1ae65b8357985">spiWriteRegister</a>(NRF24_REG_1D_FEATURE, NRF24_EN_DYN_ACK);</div>
    81. 

  81. <div class="line">  analogReference(INTERNAL); <span class="comment">// So we can read 1Vp-p signals</span></div>
    82. 

  82. <div class="line">  Serial.println(<span class="stringliteral">&quot;initialised&quot;</span>);</div>
    83. 

  83. <div class="line">}</div>
    84. 

  84. <div class="line">  </div>
    85. 

  85. <div class="line"><span class="keywordtype">void</span> loop()</div>
    86. 

  86. <div class="line">{</div>
    87. 

  87. <div class="line">  uint8_t buf[32];</div>
    88. 

  88. <div class="line">  uint8_t i;</div>
    89. 

  89. <div class="line">  </div>
    90. 

  90. <div class="line">  <span class="comment">// Collect 32 audio samples. At 109 microsecs per sample, we can achieve about 250</span></div>
    91. 

  91. <div class="line">  <span class="comment">// 32 byte packets transmitted per second: 6.4kHz sample rate</span></div>
    92. 

  92. <div class="line">  <span class="keywordflow">for</span> (i = 0; i &lt; 32; i++)</div>
    93. 

  93. <div class="line">    buf[i] = analogRead(0); <span class="comment">// 0 - 1023 becomes 0 - 255, top 2 bits clipped. approx 109 microsecs per sample</span></div>
    94. 

  94. <div class="line"></div>
    95. 

  95. <div class="line">  <span class="comment">// Now send the samples NOACK (EN_DYN_ACK must be enabled first)</span></div>
    96. 

  96. <div class="line">  <span class="comment">// With 2Mbps, NOACK and 32 byte payload, can send about 1900 messages per sec</span></div>
    97. 

  97. <div class="line">  <span class="keywordflow">if</span> (!nrf24.<a name="a8"></a><a class="code" href="classNRF24.html#a7b40c4c481bddf343acdac5179fddc75">setTransmitAddress</a>((uint8_t*)<span class="stringliteral">&quot;aurx1&quot;</span>, 5))</div>
    98. 

  98. <div class="line">   Serial.println(<span class="stringliteral">&quot;setTransmitAddress failed&quot;</span>);</div>
    99. 

  99. <div class="line">  <span class="comment">// Send the data  </span></div>
    100. 

  100. <div class="line">  <span class="keywordflow">if</span> (!nrf24.<a name="a9"></a><a class="code" href="classNRF24.html#aad280539b80b28e55ab3187714bc7f2f">send</a>(buf, <span class="keyword">sizeof</span>(buf), <span class="keyword">true</span>)) <span class="comment">// NOACK, 110 microsecs</span></div>
    101. 

  101. <div class="line">     Serial.println(<span class="stringliteral">&quot;send failed&quot;</span>);  </div>
    102. 

  102. <div class="line">  <span class="comment">// Transmission takes about 300 microsecs, of which about 130microsecs is transmitter startup time</span></div>
    103. 

  103. <div class="line">  <span class="comment">// and 160 microsecs is transmit time for 32 bytes+8 bytes overhead @ 2Mbps</span></div>
    104. 

  104. <div class="line">  <span class="keywordflow">if</span> (!nrf24.<a name="a10"></a><a class="code" href="classNRF24.html#a78a011cddedb14b8764ad5ea760c28ae">waitPacketSent</a>())</div>
    105. 

  105. <div class="line">     Serial.println(<span class="stringliteral">&quot;waitPacketSent failed&quot;</span>);  </div>
    106. 

  106. <div class="line">    digitalWrite(3, LOW);</div>
    107. 

  107. <div class="line">}</div>
    108. 

  108. <div class="line"></div>
    109. 

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