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131 lines
4.3 KiB
131 lines
4.3 KiB
/*************************************************************************
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* This demo uses the BALibrary library to provide enhanced control of
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* the TGA Pro board.
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*
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* The latest copy of the BA Guitar library can be obtained from
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* https://github.com/Blackaddr/BALibrary
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*
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* This example demonstrates teh AudioEffectsTremolo effect. It can
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* be controlled using USB MIDI. You can get a free USB MIDI Controller
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* appliation at
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* http://www.blackaddr.com/downloads/BAMidiTester/
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* or the source code at
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* https://github.com/Blackaddr/BAMidiTester
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*
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* Even if you don't control the guitar effect with USB MIDI, you must set
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* the Arduino IDE USB-Type under Tools to "Serial + MIDI"
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*/
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#include <MIDI.h>
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#include "BALibrary.h"
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#include "BAEffects.h"
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using namespace midi;
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using namespace BAEffects;
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using namespace BALibrary;
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AudioInputI2S i2sIn;
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AudioOutputI2S i2sOut;
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BAAudioControlWM8731 codec;
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/// IMPORTANT /////
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// YOU MUST USE TEENSYDUINO 1.41 or greater
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// YOU MUST COMPILE THIS DEMO USING Serial + Midi
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//#define USE_EXT // uncomment this line to use External MEM0
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#define MIDI_DEBUG // uncomment to see raw MIDI info in terminal
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AudioEffectTremolo tremolo;
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AudioFilterBiquad cabFilter; // We'll want something to cut out the highs and smooth the tone, just like a guitar cab.
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// Simply connect the input to the tremolo, and the output
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// to both i2s channels
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AudioConnection input(i2sIn,0, tremolo,0);
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AudioConnection tremoloOut(tremolo, 0, cabFilter, 0);
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AudioConnection leftOut(cabFilter,0, i2sOut, 0);
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AudioConnection rightOut(cabFilter,0, i2sOut, 1);
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int loopCount = 0;
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void setup() {
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delay(100);
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Serial.begin(57600); // Start the serial port
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// Disable the codec first
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codec.disable();
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delay(100);
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AudioMemory(128);
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delay(5);
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// Enable the codec
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Serial.println("Enabling codec...\n");
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codec.enable();
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delay(100);
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// Configure which MIDI CC's will control the effect parameters
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tremolo.mapMidiControl(AudioEffectTremolo::BYPASS,16);
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tremolo.mapMidiControl(AudioEffectTremolo::RATE,20);
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tremolo.mapMidiControl(AudioEffectTremolo::DEPTH,21);
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tremolo.mapMidiControl(AudioEffectTremolo::VOLUME,22);
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// Besure to enable the tremolo. When disabled, audio is is completely blocked
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// to minimize resources to nearly zero.
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tremolo.enable();
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// Set some default values.
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// These can be changed by sending MIDI CC messages over the USB using
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// the BAMidiTester application.
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tremolo.rate(0.5f); // initial LFO rate of 1/2 max which is about 10 Hz
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tremolo.bypass(false);
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tremolo.depth(0.5f); // 50% depth modulation
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// Setup 2-stages of LPF, cutoff 4500 Hz, Q-factor 0.7071 (a 'normal' Q-factor)
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cabFilter.setLowpass(0, 4500, .7071);
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cabFilter.setLowpass(1, 4500, .7071);
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}
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void OnControlChange(byte channel, byte control, byte value) {
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tremolo.processMidi(channel, control, value);
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#ifdef MIDI_DEBUG
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Serial.print("Control Change, ch=");
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Serial.print(channel, DEC);
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Serial.print(", control=");
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Serial.print(control, DEC);
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Serial.print(", value=");
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Serial.print(value, DEC);
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Serial.println();
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#endif
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}
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void loop() {
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// usbMIDI.read() needs to be called rapidly from loop(). When
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// each MIDI messages arrives, it return true. The message must
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// be fully processed before usbMIDI.read() is called again.
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if (loopCount % 524288 == 0) {
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Serial.print("Processor Usage, Total: "); Serial.print(AudioProcessorUsage());
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Serial.print("% ");
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Serial.print(" tremolo: "); Serial.print(tremolo.processorUsage());
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Serial.println("%");
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}
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loopCount++;
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// check for new MIDI from USB
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if (usbMIDI.read()) {
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// this code entered only if new MIDI received
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byte type, channel, data1, data2, cable;
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type = usbMIDI.getType(); // which MIDI message, 128-255
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channel = usbMIDI.getChannel(); // which MIDI channel, 1-16
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data1 = usbMIDI.getData1(); // first data byte of message, 0-127
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data2 = usbMIDI.getData2(); // second data byte of message, 0-127
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Serial.println(String("Received a MIDI message on channel ") + channel);
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if (type == MidiType::ControlChange) {
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// if type is 3, it's a CC MIDI Message
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// Note: the Arduino MIDI library encodes channels as 1-16 instead
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// of 0 to 15 as it should, so we must subtract one.
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OnControlChange(channel-1, data1, data2);
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}
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}
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}
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