Arduino / PCM Audio : Change PIN used by the speaker

Using the libraby provided here : http://www.arduino.cc/playground/Code/PCMAudio
It’s possible to play pcm audio with 16kbps bitrate and 8khz samplerate.

Step-by-step procedure is describe here : http://hlt.media.mit.edu/?p=1963
On the initial version of library, the speaker use pin 11 of the Arduino. This PIN cannot be used if you add the Ethernet Shield.

ATMega Timer2 (used by the lib), has the output on PIN 11.
To use both the ethernet shield and PCM library, the only available time is Timer0. Output on this timer is on PIN 6. This Timer is also used by time control function like “delay()”.

We have to modify the PCM lib to use Timer0.
You can download the modified version here : PCM

Sample code :

#include

// Coin coin
const unsigned char samples[] PROGMEM = {
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235, 224, 238, 201, 80, 54, 202, 255, 106, 10, 106, 228, 177, 46, 60, 196, 213, 42, 10, 161, 174, 112, 125, 140, 144, 150, 146, 151, 173, 161, 134, 133, 120, 109, 113, 136, 151, 132, 117, 66, 50, 100, 79, 68, 102, 115, 98, 80, 112, 84, 66, 109, 79, 97, 111, 92, 148, 133, 125, 154, 158, 183, 122, 139, 254, 255, 253, 142, 20, 112, 226, 188, 51, 41, 182, 222, 129, 29, 114, 249, 127, 11, 94, 151, 138, 118, 122, 146, 158, 151, 124, 138, 177, 160, 156, 161, 105, 108, 165, 147, 117, 111, 106, 111, 92, 73, 74, 79, 94, 91, 105, 134, 107, 74, 77, 93, 108, 97, 97, 133, 144, 138, 142, 117, 128, 166, 172, 208, 207, 211, 244, 96, 19, 193, 241, 104, 28, 109, 203, 168, 79, 73, 200, 195, 29, 57, 150, 139, 100, 86, 157, 147, 113, 152, 122, 166, 192, 104, 123, 139, 107, 121, 139, 134, 96, 108, 104, 58, 113, 118, 63, 98, 104, 84, 111, 109, 87, 98, 116, 120, 115, 115, 126, 122, 133, 180, 152, 105, 147, 178, 196, 240, 242, 200, 72, 25, 229, 255, 63, 40, 137, 172, 172, 63, 60, 248, 206, 0, 60, 195, 110, 76, 134, 140, 148, 116, 88, 147, 204, 174, 92, 110, 141, 100, 134, 126, 95, 150, 111, 64, 92, 111, 133, 90, 62, 111, 107, 85, 83, 101, 124, 99, 87, 127, 151, 120, 122, 160, 136, 124, 129, 140, 204, 184, 181, 255, 136, 2, 139, 242, 146, 80, 105, 131, 167, 115, 41, 173, 230, 78, 50, 124, 127, 91, 93, 147, 164, 137, 106, 109, 172, 179, 137, 131, 122, 106, 82, 108, 161, 133, 94, 87, 103, 123, 89, 102, 129, 99, 100, 72, 71, 135, 115, 96, 97, 83, 130, 138, 122, 137, 120, 129, 145, 146, 174, 162, 181, 255, 197, 0, 61, 248, 167, 67, 97, 128, 199, 129, 0, 154, 255, 93, 22, 144, 151, 75, 86, 133, 148, 124, 111, 151, 161, 142, 122, 121, 170, 124, 60, 125, 134, 104, 121, 103, 115, 133, 101, 100, 123, 116, 90, 90, 96, 97, 118, 103, 98, 122, 100, 106, 132, 131, 139, 122, 119, 121, 145, 208, 181, 216, 255, 58, 35, 214, 156, 93, 129, 93, 148, 171, 39, 97, 249, 134, 29, 122, 134, 73, 84, 123, 155, 127, 82, 121, 182, 163, 110, 129, 154, 107, 93, 119, 125, 136, 113, 71, 108, 152, 104, 91, 144, 117, 87, 109, 90, 96, 123, 106, 100, 110, 120, 110, 100, 125, 131, 124, 130, 127, 129, 145, 177, 199, 238, 239, 72, 36, 210, 183, 93, 120, 110, 160, 150, 38, 139, 238, 106, 55, 114, 103, 87, 95, 104, 140, 131, 98, 136, 150, 120, 141, 145, 112, 108, 109, 107, 127, 138, 102, 82, 117, 117, 101, 120, 116, 98, 106, 104, 104, 111, 97, 100, 123, 114, 102, 113, 119, 114, 112, 125, 123, 110, 145, 160, 157, 178, 164, 210, 215, 58, 89, 228, 146, 101, 145, 121, 145, 143, 96, 151, 182, 104, 70, 107, 119, 106, 104, 108, 130, 138, 117, 122, 139, 133, 116, 113, 135, 126, 93, 115, 144, 121, 91, 95, 115, 123, 114, 90, 92, 127, 113, 90, 118, 107, 92, 131, 117, 85, 118, 128, 115, 120, 110, 110, 123, 131, 142, 143, 145, 150, 158, 172, 149, 137, 157, 139, 137, 158, 136, 125, 136, 141, 144, 130, 129, 132, 114, 115, 122, 123, 128, 121, 119, 131, 134, 125, 116, 131, 139, 110, 112, 146, 134, 105, 122, 134, 112, 108, 108, 102, 126, 118, 87, 116, 129, 96, 100, 124, 129, 107, 89, 117, 133, 114, 117, 129, 126, 113, 111, 124, 125, 133, 135, 115, 135, 156, 145, 156, 149, 128, 148, 147, 129, 140, 141, 130, 130, 133, 137, 140, 133, 131, 138, 132, 130, 138, 122, 125, 141, 124, 133, 141, 108, 128, 152, 120, 127, 143, 123, 132, 132, 104, 107, 127, 127, 115, 110, 114, 110, 117, 130, 115, 108, 114, 113, 120, 120, 119, 133, 133, 118, 110, 109, 113, 121, 121, 106, 113, 131, 128, 136, 146, 134, 129, 132, 136, 135, 137, 139, 117, 118, 143, 139, 142, 142, 129, 137, 134, 133, 141, 134, 142, 142, 123, 134, 138, 127, 132, 131, 136, 149, 134, 127, 139, 130, 123, 129, 121, 124, 129, 113, 113, 131, 128, 117, 123, 120, 111, 127, 128, 111, 129, 135, 116, 120, 118, 110, 116, 109, 108, 123, 118, 106, 120, 130, 117, 118, 127, 128, 126, 125, 134, 125, 109, 128, 135, 130, 138, 124, 124, 130, 119, 139, 152, 138, 131, 127, 141, 141, 117, 128, 139, 134, 142, 138, 131, 139, 140, 132, 130, 129, 129, 131, 123, 121, 136, 132, 118, 128, 132, 123, 125, 126, 117, 127, 137, 116, 120, 137, 122, 121, 119, 108, 131, 135, 112, 113, 115, 118, 128, 118, 114, 129, 126, 121, 124, 111, 124, 143, 119, 109, 124, 126, 126, 120, 123, 137, 132, 129, 130, 127, 136, 131, 122, 130, 132, 132, 139, 136, 126, 131, 138, 126, 124, 138, 130, 122, 131, 131, 129, 131, 127, 128, 133, 129, 123, 123, 126, 134, 132, 120, 128, 139, 130, 124, 123, 131, 140, 128, 121, 128, 130, 130, 127, 129, 130, 120, 126, 135, 119, 122, 139, 128, 120, 123, 124, 135, 134, 120, 124, 128, 125, 128, 124, 129, 135, 124, 125, 134, 132, 134, 131, 127, 132, 127, 124, 133, 131, 129, 128, 124, 134, 133, 123, 133, 132, 118, 129,
};

byte bOLDTCCR0A;
byte bOLDTCCR0B;

volatile boolean counterReady;

void setup() {
}

void loop()
{
bOLDTCCR0A = TCCR0A;
bOLDTCCR0B = TCCR0B;
counterReady = false;
startPlayback(samples, sizeof(samples));
while (!counterReady) {}
TCCR0A = bOLDTCCR0A;
TCCR0B = bOLDTCCR0B;
delay(5000);
}

This entry was posted in Arduino, Electronique, Non classé and tagged , , , , , . Bookmark the permalink.

4 Responses to Arduino / PCM Audio : Change PIN used by the speaker

  1. Olaf says:

    Hi,
    Great to see, that you have changed the library to be able using pin6 instead of pin11. Unfortunately the download link is broken. Would be great to get your advice where to find. Many thanks for your support!

  2. Mostafa Net says:

    Hello

    The download link has been corrupted

    Please fix the link

    Thanks

  3. Julien says:

    The link has been fixed.

  4. Juanjo says:

    Would be possible using Arduino Mega Timer 5 (pin 44)?

    I’m trying but it doesn’t work.

    Thank you!

    PCM.c (modified)
    ————-

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