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/*************************************************************************
* This demo uses the BALibrary library to provide enhanced control of
* the TGA Pro board.
*
* The latest copy of the BA Guitar library can be obtained from
* https://github.com/Blackaddr/BALibrary
*
* This example demonstrates teh AudioEffectsTremolo effect. It can
* be controlled using USB MIDI. You can get a free USB MIDI Controller
* appliation at
* http://www.blackaddr.com/downloads/BAMidiTester/
* or the source code at
* https://github.com/Blackaddr/BAMidiTester
*
* Even if you don't control the guitar effect with USB MIDI, you must set
* the Arduino IDE USB-Type under Tools to "Serial + MIDI"
*/
#include <MIDI.h>
#include "BALibrary.h"
#include "BAEffects.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
AudioEffectTremolo tremolo;
AudioFilterBiquad cabFilter; // We'll want something to cut out the highs and smooth the tone, just like a guitar cab.
// Simply connect the input to the tremolo, and the output
// to both i2s channels
AudioConnection input(i2sIn,0, tremolo,0);
AudioConnection tremoloOut(tremolo, 0, cabFilter, 0);
AudioConnection leftOut(cabFilter,0, i2sOut, 0);
AudioConnection rightOut(cabFilter,0, i2sOut, 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);
// Configure which MIDI CC's will control the effect parameters
tremolo.mapMidiControl(AudioEffectTremolo::BYPASS,16);
tremolo.mapMidiControl(AudioEffectTremolo::RATE,20);
tremolo.mapMidiControl(AudioEffectTremolo::DEPTH,21);
tremolo.mapMidiControl(AudioEffectTremolo::VOLUME,22);
// Besure to enable the tremolo. When disabled, audio is is completely blocked
// to minimize resources to nearly zero.
tremolo.enable();
// Set some default values.
// These can be changed by sending MIDI CC messages over the USB using
// the BAMidiTester application.
tremolo.rate(0.5f); // initial LFO rate of 1/2 max which is about 10 Hz
tremolo.bypass(false);
tremolo.depth(0.5f); // 50% depth modulation
// 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) {
tremolo.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(" tremolo: "); Serial.print(tremolo.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);
}
}
}
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