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BALibrary_HW/examples/Delay/AnalogDelayDemo/AnalogDelayDemo.ino

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5.4 KiB

#include <MIDI.h>
6 years ago
#include "BALibrary.h"
using namespace midi;
using namespace BAEffects;
using namespace BALibrary;
AudioInputI2S i2sIn;
AudioOutputI2S i2sOut;
BAAudioControlWM8731 codec;
/// IMPORTANT /////
// YOU MUST USE TEENSYDUINO 1.41 or greater
// YOU MUST COMPILE THIS DEMO USING Serial + Midi
//#define USE_EXT // uncomment this line to use External MEM0
#define MIDI_DEBUG // uncomment to see raw MIDI info in terminal
#ifdef USE_EXT
// If using external SPI memory, we will instantiance an SRAM
// manager and create an external memory slot to use as the memory
// for our audio delay
ExternalSramManager externalSram;
ExtMemSlot delaySlot; // Declare an external memory slot.
// Instantiate the AudioEffectAnalogDelay to use external memory by
/// passing it the delay slot.
AudioEffectAnalogDelay analogDelay(&delaySlot);
#else
// If using internal memory, we will instantiate the AudioEffectAnalogDelay
// by passing it the maximum amount of delay we will use in millseconds. Note that
// audio delay lengths are very limited when using internal memory due to limited
// internal RAM size.
AudioEffectAnalogDelay analogDelay(200.0f); // max delay of 200 ms.
#endif
AudioFilterBiquad cabFilter; // We'll want something to cut out the highs and smooth the tone, just like a guitar cab.
// Record the audio to the PC
//AudioOutputUSB usb;
// Simply connect the input to the delay, and the output
// to both i2s channels
AudioConnection input(i2sIn,0, analogDelay,0);
AudioConnection delayOut(analogDelay, 0, cabFilter, 0);
AudioConnection leftOut(cabFilter,0, i2sOut, 0);
AudioConnection rightOut(cabFilter,0, i2sOut, 1);
//AudioConnection leftOutUSB(cabFilter,0, usb, 0);
//AudioConnection rightOutUSB(cabFilter,0, usb, 1);
int loopCount = 0;
void setup() {
delay(100);
Serial.begin(57600); // Start the serial port
// Disable the codec first
codec.disable();
delay(100);
AudioMemory(128);
delay(5);
// Enable the codec
Serial.println("Enabling codec...\n");
codec.enable();
delay(100);
// If using external memory request request memory from the manager
// for the slot
#ifdef USE_EXT
Serial.println("Using EXTERNAL memory");
// We have to request memory be allocated to our slot.
externalSram.requestMemory(&delaySlot, 500.0f, MemSelect::MEM0, true);
#else
Serial.println("Using INTERNAL memory");
#endif
// Configure which MIDI CC's will control the effect parameters
analogDelay.mapMidiControl(AudioEffectAnalogDelay::BYPASS,16);
analogDelay.mapMidiControl(AudioEffectAnalogDelay::DELAY,20);
analogDelay.mapMidiControl(AudioEffectAnalogDelay::FEEDBACK,21);
analogDelay.mapMidiControl(AudioEffectAnalogDelay::MIX,22);
analogDelay.mapMidiControl(AudioEffectAnalogDelay::VOLUME,23);
// Besure to enable the delay. When disabled, audio is is completely blocked
// to minimize resources to nearly zero.
analogDelay.enable();
// Set some default values.
// These can be changed by sending MIDI CC messages over the USB using
// the BAMidiTester application.
analogDelay.delay(200.0f); // initial delay of 200 ms
analogDelay.bypass(false);
analogDelay.mix(0.5f);
analogDelay.feedback(0.0f);
//////////////////////////////////
// AnalogDelay filter selection //
// Uncomment to tryout the 3 different built-in filters.
//analogDelay.setFilter(AudioEffectAnalogDelay::Filter::DM3); // The default filter. Naturally bright echo (highs stay, lows fade away)
//analogDelay.setFilter(AudioEffectAnalogDelay::Filter::WARM); // A warm filter with a smooth frequency rolloff above 2Khz
//analogDelay.setFilter(AudioEffectAnalogDelay::Filter::DARK); // A very dark filter, with a sharp rolloff above 1Khz
// Setup 2-stages of LPF, cutoff 4500 Hz, Q-factor 0.7071 (a 'normal' Q-factor)
cabFilter.setLowpass(0, 4500, .7071);
cabFilter.setLowpass(1, 4500, .7071);
}
void OnControlChange(byte channel, byte control, byte value) {
analogDelay.processMidi(channel, control, value);
#ifdef MIDI_DEBUG
Serial.print("Control Change, ch=");
Serial.print(channel, DEC);
Serial.print(", control=");
Serial.print(control, DEC);
Serial.print(", value=");
Serial.print(value, DEC);
Serial.println();
#endif
}
void loop() {
// usbMIDI.read() needs to be called rapidly from loop(). When
// each MIDI messages arrives, it return true. The message must
// be fully processed before usbMIDI.read() is called again.
if (loopCount % 524288 == 0) {
Serial.print("Processor Usage, Total: "); Serial.print(AudioProcessorUsage());
Serial.print("% ");
Serial.print(" analogDelay: "); Serial.print(analogDelay.processorUsage());
Serial.println("%");
}
loopCount++;
// check for new MIDI from USB
if (usbMIDI.read()) {
// this code entered only if new MIDI received
byte type, channel, data1, data2, cable;
type = usbMIDI.getType(); // which MIDI message, 128-255
channel = usbMIDI.getChannel(); // which MIDI channel, 1-16
data1 = usbMIDI.getData1(); // first data byte of message, 0-127
data2 = usbMIDI.getData2(); // second data byte of message, 0-127
Serial.println(String("Received a MIDI message on channel ") + channel);
if (type == MidiType::ControlChange) {
// if type is 3, it's a CC MIDI Message
// Note: the Arduino MIDI library encodes channels as 1-16 instead
// of 0 to 15 as it should, so we must subtract one.
OnControlChange(channel-1, data1, data2);
}
}
}