Skip to content

Commit

Permalink
MCP4XXX library and digital potentiometer controls
Browse files Browse the repository at this point in the history 
Added control of digital potentiometer circuits for amps with electronic control of gain
  • Loading branch information
@D34G
D34G authored Mar 31, 2021
1 parent c8c290e commit 680ef9a
Showing 1 changed file with 39 additions and 46 deletions.
85 changes: 39 additions & 46 deletions examples/Player/Player.ino
View file
Original file line number Diff line number Diff line change
Expand Up @@ -9,23 +9,25 @@
Author : D34G
*/

//To Do: add digital potentiometer example

#include <SD.h>
#include <SPI.h>
#include <SamdAudioSD.h>
SamdAudioSD AudioPlayer;


//-----------------------------------Global Variables-----------------------------------
#define NUM_AUDIO_CHANNELS 4 // Set to either 1, 2, or 4 for simultaneous playback
#define AUDIO_BUFFER_SIZE 512 // 512 works fine for 22.05kh, 32khz, and 44.1khz. not recommeneded to use any other size
#define YOUR_SD_CS 8 // SD chip select pin (with ethernet shield : 4)
#define AUDIO_BUFFER_SIZE 512 // 512 works fine for 22.05kh, 32khz, and 44.1khz (not recommeneded to use any other size)
#define YOUR_SD_CS 8 // SD chip select pin
#define SHUTDOWN_PIN 7 // shutdown pin for Class D amplifiers such as the PAM8302 (defaults to pin 7 in library if no explicitly set in setup)
#define DAC_PIN A0 // audio output pin on Arduino board (defaults to pin A0 in library if no explicitly set in setup)
#define DIGITAL_POT 5 // digital potentiometer pin to control amplifier hardware gain (defaults to pin 5 in library if no explicitly set in setup)

SamdAudioSD AudioPlayer;
const char *filename = "test.wav"; // your wav file, be cautious of the 8.3 filename format and place in root of your sd card
uint32_t sampleRate = 44100; //indicate sample rate here (use audacity to convert your wav)


//-----------------------------------Functions-----------------------------------
void setup()
{
Serial.begin(115200);
Expand All @@ -43,8 +45,10 @@ void setup()
Serial.println(" done.");

//SPI.setClockDivider(4); // hi-speed SPI transfers, needed if playing 88200khz sample rate (88200 currently not working, don't know why)
AudioPlayer.selectShutdownPin(SHUTDOWN_PIN); // used to set shutdown pin (SD) on amplifier if desired and set pinmode to output, if set .play() will
AudioPlayer.selectShutdownPin(SHUTDOWN_PIN); // used to set shutdown pin (SD) on amplifier if desired and set pinmode to output, if set .play() will power the amplifier up and down as needed
AudioPlayer.selectDACPin(DAC_PIN); // used to set audio output pin on Arduino (defaults to pin A0)
AudioPlayer.selectDigitalPotPin(DIGITAL_POT); // used to set the digital potentiometer pin on the arduino in order to control amplifier volume (note, if using other SPI devices all pins will have to be set high first)
AudioPlayer.setVolume(100); // set the volume anywhere from 0 to 100 (note, if using other SPI devices all pins will have to be set high first)
//AudioPlayer.setBlocking(true); // code execution waits for audio to finish (default is set to false)
AudioPlayer.begin(sampleRate, NUM_AUDIO_CHANNELS, AUDIO_BUFFER_SIZE); // required inputs: sample rate, number of audio channels possible, size of audio buffer for processing

Expand All @@ -62,88 +66,77 @@ void loop()

if ( c == 'o')
{
AudioPlayer.play("FX/FX6.wav", 0);
Serial.println("pouwww! ch1!");
AudioPlayer.play("test1.wav", 0); // plays audio on channel 1
Serial.println("playing on ch1!");
}
else if ( c == 'O')
{
AudioPlayer.play("FX/FX6.wav", 1);
Serial.println("pouwww! ch2!");
AudioPlayer.play("test2.wav", 1); // plays audio on channel 2
Serial.println("playing on ch2!");
}
else if ( c == 's')
{
AudioPlayer.play("TRACK/HAWKEYE.wav", 2);
Serial.println("hawkeye ch3!");
AudioPlayer.play("test3.wav", 2); // plays audio on channel 3
Serial.println("playing on ch3!");
}
else if ( c == 'S')
{
AudioPlayer.play("TRACK/HAWKEYE.wav", 3);
Serial.println("hawkeye ch4!");
AudioPlayer.play("test4.wav", 3); // plays audio on channel 4
Serial.println("playing on ch4!");
}
else if ( c == 'd')
{
AudioPlayer.play("TRACK/COMMANDO.wav", 0);
Serial.println("commando ch1!");
}
else if ( c == 'D')
{
AudioPlayer.play("TRACK/COMMANDO.wav", 1);
Serial.println("commando ch2!");
}
else if ( c == 'm')
else if ( c == 'l')
{
AudioPlayer.play("TRACK/MARIACHI.wav", 2);
Serial.println("mariachi ch3!");
AudioPlayer.loopChannel(0, true); // sets flag to loop channel one as true to loop until flag is set false
Serial.println("start looping ch1!");
}
else if ( c == 'M')
else if ( c == 'L')
{
AudioPlayer.play("TRACK/MARIACHI.wav", 3);
Serial.println("mariachi ch4!");
AudioPlayer.loopChannel(0, false); // removes flag to loop channel one to false to stop looping once current playback completes
Serial.println("stop looping ch1!");
}
else if ( c == 'l')
else if ( c == 'g')
{
AudioPlayer.loopChannel(0, true);
Serial.println("start looping ch1!");
AudioPlayer.gainUp(); // a software control which increases volume during audio processing
Serial.println("increase gain!");
}
else if ( c == 'L')
else if ( c == 'G')
{
AudioPlayer.loopChannel(0, false);
Serial.println("stop looping ch1!");
AudioPlayer.gainDown(); // a software control which decreases volume during audio processing
Serial.println("decrease gain!");
}
else if ( c == 'v')
{
AudioPlayer.gainUp();
Serial.println("increase gain!");
AudioPlayer.volumeUp(); // a hardware control which increases amplifier volume through use of a digital potentiometer like the MCP4151 or MCP 4152 (note, if using other SPI devices all pins will have to be set high first)
Serial.println("increase volume!");
}
else if ( c == 'V')
{
AudioPlayer.gainDown();
Serial.println("decrease gain!");
AudioPlayer.volumeDown(); // a hardware control which decreases amplifier volume through use of a digital potentiometer like the MCP4151 or MCP 4152 (note, if using other SPI devices all pins will have to be set high first)
Serial.println("decrease volume!");
}
else if ( c == '0')
{
AudioPlayer.stopChannel(0);
//AudioPlayer.setShutdownPinState(LOW);
AudioPlayer.stopChannel(0); // stops playback on channel 1
Serial.println("ch1 off!");
}
else if ( c == '1')
{
AudioPlayer.stopChannel(1);
AudioPlayer.stopChannel(1); // stops playback on channel 2
Serial.println("ch2 off!");
}
else if ( c == '2')
{
AudioPlayer.stopChannel(2);
AudioPlayer.stopChannel(2); // stops playback on channel 3
Serial.println("ch3 off!");
}
else if ( c == '3')
{
AudioPlayer.stopChannel(3);
AudioPlayer.stopChannel(3); // stops playback on channel 4
Serial.println("ch4 off!");
}
else if ( c == 'X')
{
AudioPlayer.end();
AudioPlayer.end(); // terminates audioplayer session
Serial.println("stop audio player!");
}
else if ( c == 'Y')
Expand Down

0 comments on commit 680ef9a

Please sign in to comment.