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automatically reduced to accomodate only the remaining channels used. |
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automatically reduced to accomodate only the remaining channels used. |
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</p> |
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</p> |
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<h3>Hardware</h3> |
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<h3>Hardware</h3> |
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<p>By default, a single 23LC1024 RAM chip is used, with these pins: |
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<p>By default, or when <span class=literal>AUDIO_MEMORY_23LC1024</span> is used (see below), |
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a single 23LC1024 RAM chip is used, with these pins: |
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<table class=doc align=center cellpadding=3> |
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<table class=doc align=center cellpadding=3> |
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<tr class=top><th>Pin</th><th>Signal</th></tr> |
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<tr class=top><th>Pin</th><th>Signal</th></tr> |
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<tr class=odd><td align=center>6</td><td>CS</td></tr> |
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<tr class=odd><td align=center>6</td><td>CS</td></tr> |
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<tr class=odd><td align=center>12</td><td>MISO</td></tr> |
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<tr class=odd><td align=center>12</td><td>MISO</td></tr> |
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<tr class=odd><td align=center>14</td><td>SCK</td></tr> |
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<tr class=odd><td align=center>14</td><td>SCK</td></tr> |
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</table> |
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</table> |
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</p> |
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<p>When <span class=literal>AUDIO_MEMORY_MEMORYBOARD</span> is used, up to six |
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23LC1024 chips are used. |
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</p> |
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<p align=center><img src="memoryboard.jpg"><br><small><a href="https://oshpark.com/shared_projects/KZt5PaU7" target="_blank">Memoryboard 4</a></small></p> |
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<p> |
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<table class=doc align=center cellpadding=3> |
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<tr class=top><th>Pin</th><th>Signal</th></tr> |
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<tr class=odd><td align=center>2</td><td>CS0 (encoded)</td></tr> |
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<tr class=odd><td align=center>3</td><td>CS1 (encoded)</td></tr> |
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<tr class=odd><td align=center>4</td><td>CS2 (encoded)</td></tr> |
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<tr class=odd><td align=center>7</td><td>MOSI</td></tr> |
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<tr class=odd><td align=center>12</td><td>MISO</td></tr> |
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<tr class=odd><td align=center>14</td><td>SCK</td></tr> |
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</table> |
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</p> |
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<p> |
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If fewer than 6 chips are soldered, the optional parameter for maximum delay |
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must be used. See below for details. Each chip provides 1485 ms of delay |
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memory, so the total of all objects using AUDIO_MEMORY_MEMORYBOARD must not |
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exceed the amount of memory physically present. |
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</p> |
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</p> |
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<h3>Examples</h3> |
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<h3>Examples</h3> |
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<p> |
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<a href="https://www.youtube.com/watch?v=d80d1HWy5_s" target="_blank">Demo Video</a> (YouTube) |
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<a href="https://www.youtube.com/watch?v=d80d1HWy5_s" target="_blank">Demo Video</a> (YouTube) |
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<!--<p class=exam>File > Examples > Audio > Effects > Delay |
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</p>--> |
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</p> |
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<!-- <p class=exam>File > Examples > Audio > Effects > Delay |
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</p> --> |
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<p> |
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<a href="https://forum.pjrc.com/threads/29276-Limits-of-delay-effect-in-audio-library?p=79436&viewfull=1#post79436" target="_blank">Forum Conversaton</a> (with sample code) |
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</p> |
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<h3>Notes</h3> |
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<h3>Notes</h3> |
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<p>External RAM allows for longer delays without consuming |
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<p>External RAM allows for longer delays without consuming |
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limited internal RAM. However, SPI communication is required, |
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limited internal RAM. However, SPI communication is required, |
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<a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html">AudioProcessorUsageMax</a> |
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<a href="http://www.pjrc.com/teensy/td_libs_AudioProcessorUsage.html">AudioProcessorUsageMax</a> |
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function may be used to monitor how much CPU time is consumed. |
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function may be used to monitor how much CPU time is consumed. |
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</p> |
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</p> |
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<p>You may specify the type of hardware to be used by editing the code. Currently, AUDIO_MEMORY_23LC1024 |
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is the only supported option. Future support for AUDIO_MEMORY_MEMORYBOARD is |
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planned. |
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<p>You may specify the type of hardware to be used by editing the code. AUDIO_MEMORY_23LC1024 |
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specifies a single 23LC1024 chip. AUDIO_MEMORY_MEMORYBOARD allows using up to 6 of these |
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chips. |
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</p> |
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</p> |
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<p class=desc><span class=keyword>AudioEffectDelayExternal</span> delayExt1(<span class=literal>AUDIO_MEMORY_23LC1024</span>); |
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<p class=desc><span class=keyword>AudioEffectDelayExternal</span> delayExt1(<span class=literal>AUDIO_MEMORY_23LC1024</span>); |
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</p> |
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</p> |