visus
/
teensy-audio


			
				
					
						
						
							
							
	<h3>Summary</h3>
	<p>Transmit 16 bit stereo audio to the
	<a href="http://www.pjrc.com/store/teensy3_audio.html" target="_blank">audio shield</a>
		or another I2S device, using I2S master mode.</p>
	<p align=center><img src="img/audioshield_outputs.jpg"></p>
	<h3>Audio Connections</h3>
	<table class=doc align=center cellpadding=3>
		<tr class=top><th>Port</th><th>Purpose</th></tr>
		<tr class=odd><td align=center>In 0</td><td>Left Channel</td></tr>
		<tr class=odd><td align=center>In 1</td><td>Right Channel</td></tr>
	</table>
	<h3>Functions</h3>
	<p>This object has no functions to call from the Arduino sketch.  It
		simply streams data from its 2 input ports to the I2S hardware.</p>
	<h3>Hardware</h3>
	<p align=center><img src="img/audioshield_backside.jpg"></p>
	<p>The I2S signals are used in "master" mode, where Teensy creates
		all 3 clock signals and controls all data timing.</p>
	<table class=doc align=center cellpadding=3>
		<tr class=top><th>Pin</th><th>Signal</th><th>Direction</th></tr>
		<tr class=odd><td align=center>9</td><td>BCLK</td><td>Output</td></tr>
		<tr class=odd><td align=center>11</td><td>MCLK</td><td>Output</td></tr>
		<tr class=odd><td align=center>22</td><td>TX</td><td>Output</td></tr>
		<tr class=odd><td align=center>23</td><td>LRCLK</td><td>Output</td></tr>
	</table>
	<p>Audio from
		master mode I2S may be used in the same project as ADC, DAC and
		PWM signals, because all remain in sync to Teensy's timing</p>
	<h3>Examples</h3>
	<p>Nearly all the examples use this object.  Here are some of the highlights:</p>
	<p class=exam>File &gt; Examples &gt; Audio &gt; HardwareTesting &gt; PassThroughStereo
	</p>
	<p class=exam>File &gt; Examples &gt; Audio &gt; SamplePlayer
	</p>
	<p class=exam>File &gt; Examples &gt; Audio &gt; Recorder
	</p>
	<p class=exam>File &gt; Examples &gt; Audio &gt; WavFilePlayer
	</p>
	<p class=exam>File &gt; Examples &gt; Audio &gt; Effects &gt; Chorus
	</p>
	<p class=exam>File &gt; Examples &gt; Audio &gt; Synthesis &gt; PlaySynthMusic
	</p>
	<h3>Notes</h3>
	<p>Normally, this object is used with the Audio Shield, which
		is controlled separately by the "sgtl5000" object.</p>
	<p>Only one I2S input and one I2S output object may be used.  Master
		and slave modes may not be mixed (both must be of the same type).
	</p>