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191 lines
5.9 KiB
191 lines
5.9 KiB
/*************************************************************************
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* This demo uses the BAGuitar 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/BAGuitar
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*
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* This demo will provide an audio passthrough, as well as exercise the
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* MIDI interface.
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*
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* It can optionally exercise the SPI MEM0 if installed on the TGA Pro board.
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*
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*/
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#include <Wire.h>
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#include <Audio.h>
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#include <MIDI.h>
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#include <SPI.h>
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#include "BAGuitar.h"
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#include <midi_UsbTransport.h>
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static const unsigned sUsbTransportBufferSize = 16;
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typedef midi::UsbTransport<sUsbTransportBufferSize> UsbTransport;
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UsbTransport sUsbTransport;
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MIDI_CREATE_INSTANCE(UsbTransport, sUsbTransport, uMIDI);
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MIDI_CREATE_DEFAULT_INSTANCE();
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using namespace midi;
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using namespace BAEffects;
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#define MIDI_DEBUG
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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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// External SRAM is required for this effect due to the very long
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// delays required.
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ExternalSramManager externalSram;
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ExtMemSlot delaySlot; // Declare an external memory slot.
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AudioEffectSOS sos(&delaySlot);
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// Add some effects for our soloing channel
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AudioEffectDelay delayModule; // we'll add a little slapback echo
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AudioMixer4 gainModule; // This will be used simply to reduce the gain before the reverb
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AudioEffectReverb reverb; // Add a bit of 'verb to our tone
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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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AudioMixer4 mixer;
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// Connect the input
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AudioConnection inputToSos(i2sIn, 0, sos, 0);
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AudioConnection inputToSolo(i2sIn, 0, delayModule, 0);
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// Patch cables for the SOLO channel
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AudioConnection inputToGain(delayModule, 0, gainModule, 0);
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AudioConnection inputToReverb(gainModule, 0, reverb, 0);
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// Output Mixer
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AudioConnection mixer0input(i2sIn, 0, mixer, 0); // SOLO Dry Channel
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AudioConnection mixer1input(reverb, 0, mixer, 1); // SOLO Wet Channel
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AudioConnection mixer2input(sos, 0, mixer, 2); // SOS Channel
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AudioConnection inputToCab(mixer, 0, cabFilter, 0);
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// CODEC Outputs
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AudioConnection outputLeft(cabFilter, 0, i2sOut, 0);
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AudioConnection outputRight(cabFilter, 0, i2sOut, 1);
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int loopCount = 0;
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void OnControlChange(byte channel, byte control, byte value) {
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sos.processMidi(channel-1, 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 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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// We have to request memory be allocated to our slot.
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externalSram.requestMemory(&delaySlot, SPI_MEM0_SIZE_BYTES, MemSelect::MEM0, true);
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//externalSram.requestMemory(&delaySlot, 50.0f, MemSelect::MEM0, true);
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// Setup MIDI
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MIDI.begin(MIDI_CHANNEL_OMNI);
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MIDI.setHandleControlChange(OnControlChange);
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uMIDI.begin(MIDI_CHANNEL_OMNI);
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uMIDI.setHandleControlChange(OnControlChange);
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// Configure the LED to indicate the gate status
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sos.setGateLedGpio(USR_LED_ID);
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// Configure which MIDI CC's will control the effect parameters
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sos.mapMidiControl(AudioEffectSOS::BYPASS,16);
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sos.mapMidiControl(AudioEffectSOS::CLEAR_FEEDBACK_TRIGGER,22);
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sos.mapMidiControl(AudioEffectSOS::GATE_TRIGGER,23);
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sos.mapMidiControl(AudioEffectSOS::GATE_OPEN_TIME,20);
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sos.mapMidiControl(AudioEffectSOS::GATE_CLOSE_TIME,21);
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sos.mapMidiControl(AudioEffectSOS::FEEDBACK,24);
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sos.mapMidiControl(AudioEffectSOS::VOLUME,17);
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// Besure to enable the delay. When disabled, audio is is completely blocked
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// to minimize resources to nearly zero.
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sos.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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sos.bypass(false);
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sos.gateOpenTime(3000.0f);
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sos.gateCloseTime(1000.0f);
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sos.feedback(0.9f);
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// Setup effects on the SOLO channel
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gainModule.gain(0, 0.25); // the reverb unit clips easily if the input is too high
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delayModule.delay(0, 50.0f); // 50 ms slapback delay
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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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// Setup the Mixer
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mixer.gain(0, 0.5f); // SOLO Dry gain
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mixer.gain(1, 0.5f); // SOLO Wet gain
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mixer.gain(1, 1.0f); // SOS gain
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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(" sos: "); Serial.print(sos.processorUsage());
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Serial.println("%");
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}
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loopCount++;
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MIDI.read();
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uMIDI.read();
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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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//
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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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