#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
#include <Bounce.h>
// Bitcrusher example by Jonathan Payne (Pensive) jon@jonnypayne.com
// No rights reserved. Do what you like with it.
// Create the Audio components.
AudioPlaySdWav playWav1; //this will play a looping demo file
AudioOutputI2S headphones; // and it will come out of the headphone socket.
//Audio Effect BitCrusher defs here
AudioEffectBitcrusher left_BitCrusher;
AudioEffectBitcrusher right_BitCrusher;
// Create Audio connections between the components
AudioConnection patchCord1(playWav1, 0, left_BitCrusher, 0);
AudioConnection patchCord2(playWav1, 1, right_BitCrusher, 0);
AudioConnection patchCord3(left_BitCrusher, 0, headphones, 0);
AudioConnection patchCord4(right_BitCrusher, 0, headphones, 1);
// Create an object to control the audio shield.
//
AudioControlSGTL5000 audioShield;
// Use these with the Teensy Audio Shield
#define SDCARD_CS_PIN 10
#define SDCARD_MOSI_PIN 7
#define SDCARD_SCK_PIN 14
// Use these with the Teensy 3.5 & 3.6 SD card
//#define SDCARD_CS_PIN BUILTIN_SDCARD
//#define SDCARD_MOSI_PIN 11 // not actually used
//#define SDCARD_SCK_PIN 13 // not actually used
// Use these for the SD+Wiz820 or other adaptors
//#define SDCARD_CS_PIN 4
//#define SDCARD_MOSI_PIN 11
//#define SDCARD_SCK_PIN 13
// Bounce objects to read six pushbuttons (pins 0-5)
//
Bounce button0 = Bounce(0, 5); // cycles the bitcrusher through all bitdepths
Bounce button1 = Bounce(1, 5); //cycles the bitcrusher through some key samplerates
Bounce button2 = Bounce(2, 5); // turns on the compressor (or "Automatic Volume Leveling")
unsigned long SerialMillisecondCounter;
//BitCrusher
int current_CrushBits = 16; //this defaults to passthrough.
int current_SampleRate = 44100; // this defaults to passthrough.
//Compressor
boolean compressorOn = false; // default this to off.
void setup() {
// Configure the pushbutton pins for pullups.
// Each button should connect from the pin to GND.
pinMode(0, INPUT_PULLUP);
pinMode(1, INPUT_PULLUP);
pinMode(2, INPUT_PULLUP);
Serial.begin(38400); // open the serial
// Audio connections require memory to work. For more
// detailed information, see the MemoryAndCpuUsage example
AudioMemory(40); //this is WAY more tha nwe need
// turn on the output
audioShield.enable();
audioShield.volume(0.7);
// by default the Teensy 3.1 DAC uses 3.3Vp-p output
// if your 3.3V power has noise, switching to the
// internal 1.2V reference can give you a clean signal
//dac.analogReference(INTERNAL);
// reduce the gain on mixer channels, so more than 1
// sound can play simultaneously without clipping
//SDCard Initialise
SPI.setMOSI(SDCARD_MOSI_PIN);
SPI.setSCK(SDCARD_SCK_PIN);
if (!(SD.begin(SDCARD_CS_PIN))) {
// stop here, but print a message repetitively
while (1) {
Serial.println("Unable to access the SD card");
delay(500);
}
}
// Bitcrusher
left_BitCrusher.bits(current_CrushBits); //set the crusher to defaults. This will passthrough clean at 16,44100
left_BitCrusher.sampleRate(current_SampleRate); //set the crusher to defaults. This will passthrough clean at 16,44100
right_BitCrusher.bits(current_CrushBits); //set the crusher to defaults. This will passthrough clean at 16,44100
right_BitCrusher.sampleRate(current_SampleRate); //set the crusher to defaults. This will passthrough clean at 16,44100
//Bitcrusher
/* Valid values for dap_avc parameters
maxGain; Maximum gain that can be applied
0 - 0 dB
1 - 6.0 dB
2 - 12 dB
lbiResponse; Integrator Response
0 - 0 mS
1 - 25 mS
2 - 50 mS
3 - 100 mS
hardLimit
0 - Hard limit disabled. AVC Compressor/Expander enabled.
1 - Hard limit enabled. The signal is limited to the programmed threshold (signal saturates at the threshold)
threshold
floating point in range 0 to -96 dB
attack
floating point figure is dB/s rate at which gain is increased
decay
floating point figure is dB/s rate at which gain is reduced
*/
// Initialise the AutoVolumeLeveller
audioShield.autoVolumeControl(1, 1, 0, -6, 40, 20); // **BUG** with a max gain of 0, turning the AVC off leaves a hung AVC problem where the attack seems to hang in a loop. with it set 1 or 2, this does not occur.
audioShield.autoVolumeDisable();
audioShield.audioPostProcessorEnable();
SerialMillisecondCounter = millis();
}
int val; //temporary variable for memory usage reporting.
void loop() {
if (millis() - SerialMillisecondCounter >= 5000) {
Serial.print("Proc = ");
Serial.print(AudioProcessorUsage());
Serial.print(" (");
Serial.print(AudioProcessorUsageMax());
Serial.print("), Mem = ");
Serial.print(AudioMemoryUsage());
Serial.print(" (");
Serial.print(AudioMemoryUsageMax());
Serial.println(")");
SerialMillisecondCounter = millis();
AudioProcessorUsageMaxReset();
AudioMemoryUsageMaxReset();
}
// Update all the button objects
button0.update();
button1.update();
button2.update();
// Start test sound if it is not playing. This will loop infinitely.
if (! (playWav1.isPlaying())){
playWav1.play("SDTEST1.WAV"); // http://www.pjrc.com/teensy/td_libs_AudioDataFiles.html
}
if (button0.fallingEdge()) {
//Bitcrusher BitDepth
if (current_CrushBits >= 2) { //eachtime you press it, deduct 1 bit from the settings.
current_CrushBits--;
} else {
current_CrushBits = 16; // if you get down to 1 go back to the top.
}
left_BitCrusher.bits(current_CrushBits);
left_BitCrusher.sampleRate(current_SampleRate);
right_BitCrusher.bits(current_CrushBits);
right_BitCrusher.sampleRate(current_SampleRate);
Serial.print("Bitcrusher set to ");
Serial.print(current_CrushBits);
Serial.print(" Bit, Samplerate at ");
Serial.print(current_SampleRate);
Serial.println("Hz");
}
if (button1.fallingEdge()) {
//Bitcrusher SampleRate // the lowest sensible setting is 345. There is a 128 sample buffer, and this will copy sample 1, to each of the other 127 samples.
if (current_SampleRate >= 690) { // 345 * 2, so we can do one more divide
current_SampleRate = current_SampleRate / 2; // half the sample rate each time
} else {
current_SampleRate=44100; // if you get down to the minimum then go back to the top and start over.
}
left_BitCrusher.bits(current_CrushBits);
left_BitCrusher.sampleRate(current_SampleRate);
right_BitCrusher.bits(current_CrushBits);
right_BitCrusher.sampleRate(current_SampleRate);
Serial.print("Bitcrusher set to ");
Serial.print(current_CrushBits);
Serial.print(" Bit, Samplerate at ");
Serial.print(current_SampleRate);
Serial.println("Hz");
}
if (button2.fallingEdge()) {
if (compressorOn) {
//turn off compressor
audioShield.autoVolumeDisable();
compressorOn = false;
} else {
//turn on compressor
audioShield.autoVolumeEnable();
compressorOn = true;
}
Serial.print("Compressor: ");
Serial.println(compressorOn);
}
}