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BALibrary/examples/Delay/SoundOnSoundExpansionDemo/SoundOnSoundExpansionDemo.ino

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8.2 KiB

/*************************************************************************
* 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 DEMO REQUIRES BOTH THE EXTERNAL SRAM AND EXPANSION BOARD ADD-ONS
*
* This demo combines the Blackaddr Audio Expansion board with the BAAudioEffectSOS,
* which provides sound-on-sound. The pushbuttons control the opening of the effect
* gate, as well as clearing the sound being held.
*
* The pots control the feedback, as well as the gate opening and close times.
*
*/
#define TGA_PRO_REVB // Set which hardware revision of the TGA Pro we're using
#define TGA_PRO_EXPAND_REV2 // pull in the pin definitions for the Blackaddr Audio Expansion Board.
#include "BALibrary.h"
using namespace BAEffects;
using namespace BALibrary;
AudioInputI2S i2sIn;
AudioOutputI2S i2sOut;
BAAudioControlWM8731 codec;
// External SRAM is required for this effect due to the very long
// delays required.
ExternalSramManager externalSram;
ExtMemSlot delaySlot; // Declare an external memory slot.
AudioEffectSOS sos(&delaySlot);
// Add some effects for our soloing channel
AudioEffectDelay delayModule; // we'll add a little slapback echo
AudioMixer4 gainModule; // This will be used simply to reduce the gain before the reverb
AudioEffectReverb reverb; // Add a bit of 'verb to our tone
AudioFilterBiquad cabFilter; // We'll want something to cut out the highs and smooth the tone, just like a guitar cab.
AudioMixer4 mixer;
// Connect the input
AudioConnection inputToSos(i2sIn, 0, sos, 0);
AudioConnection inputToSolo(i2sIn, 0, delayModule, 0);
// Patch cables for the SOLO channel
AudioConnection inputToGain(delayModule, 0, gainModule, 0);
AudioConnection inputToReverb(gainModule, 0, reverb, 0);
// Output Mixer
AudioConnection mixer0input(i2sIn, 0, mixer, 0); // SOLO Dry Channel
AudioConnection mixer1input(reverb, 0, mixer, 1); // SOLO Wet Channel
AudioConnection mixer2input(sos, 0, mixer, 2); // SOS Channel
AudioConnection inputToCab(mixer, 0, cabFilter, 0);
// CODEC Outputs
AudioConnection outputLeft(cabFilter, 0, i2sOut, 0);
AudioConnection outputRight(cabFilter, 0, i2sOut, 1);
//////////////////////////////////////////
// SETUP PHYSICAL CONTROLS
// - POT1 (left) will control the GATE OPEN time
// - POT2 (right) will control the GATE CLOSE TIME
// - POT3 (centre) will control the EFFECT VOLUME
// - SW1 (left) will be used as the GATE TRIGGER
// - LED1 (left) will be illuminated while the GATE is open
// - SW2 (right) will be used as the CLEAR FEEDBACK TRIGGER
// - LED2 (right) will illuminate when pressing SW2.
//////////////////////////////////////////
// To get the calibration values for your particular board, first run the
// BAExpansionCalibrate.ino example and
constexpr int potCalibMin = 1;
constexpr int potCalibMax = 1018;
constexpr bool potSwapDirection = true;
// Create a control object using the number of switches, pots, encoders and outputs on the
// Blackaddr Audio Expansion Board.
BAPhysicalControls controls(BA_EXPAND_NUM_SW, BA_EXPAND_NUM_POT, BA_EXPAND_NUM_ENC, BA_EXPAND_NUM_LED);
int loopCount = 0;
constexpr unsigned MAX_HEADPHONE_VOL = 10;
unsigned headphoneVolume = MAX_HEADPHONE_VOL; // control headphone volume from 0 to 10.
constexpr float MAX_GATE_TIME_MS = 4000.0f; // set maximum gate time of 4 seconds.
// BAPhysicalControls returns a handle when you register a new control. We'll uses these handles when working with the controls.
int gateHandle, clearHandle, openHandle, closeHandle, volumeHandle, led1Handle, led2Handle; // Handles for the various controls
void setup() {
delay(100);
delay(100); // wait a bit for serial to be available
Serial.begin(57600); // Start the serial port
delay(100); // wait a bit for serial to be available
// Setup the controls. The return value is the handle to use when checking for control changes, etc.
// pushbuttons
gateHandle = controls.addSwitch(BA_EXPAND_SW1_PIN); // will be used for bypass control
clearHandle = controls.addSwitch(BA_EXPAND_SW2_PIN); // will be used for stepping through filters
// pots
openHandle = controls.addPot(BA_EXPAND_POT1_PIN, potCalibMin, potCalibMax, potSwapDirection); // control the amount of delay
closeHandle = controls.addPot(BA_EXPAND_POT2_PIN, potCalibMin, potCalibMax, potSwapDirection);
volumeHandle = controls.addPot(BA_EXPAND_POT3_PIN, potCalibMin, potCalibMax, potSwapDirection);
// leds
led1Handle = controls.addOutput(BA_EXPAND_LED1_PIN);
led2Handle = controls.addOutput(BA_EXPAND_LED2_PIN); // will illuminate when pressing SW2
// Disable the audio codec first
codec.disable();
AudioMemory(128);
// Enable the codec
Serial.println("Enabling codec...\n");
codec.enable();
codec.setHeadphoneVolume(1.0f); // Max headphone volume
// We have to request memory be allocated to our slot.
externalSram.requestMemory(&delaySlot, SPI_MEM0_SIZE_BYTES, MemSelect::MEM0, true);
// Configure the LED to indicate the gate status, this is controlled directly by SOS effect, not by
// by BAPhysicalControls
sos.setGateLedGpio(BA_EXPAND_LED1_PIN);
// Besure to enable the delay. When disabled, audio is is completely blocked
// to minimize resources to nearly zero.
sos.enable();
// Set some default values.
// These can be changed by sending MIDI CC messages over the USB using
// the BAMidiTester application.
sos.bypass(false);
sos.gateOpenTime(3000.0f);
sos.gateCloseTime(1000.0f);
sos.feedback(0.9f);
// Setup effects on the SOLO channel
gainModule.gain(0, 0.25); // the reverb unit clips easily if the input is too high
delayModule.delay(0, 50.0f); // 50 ms slapback delay
// 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);
// Setup the Mixer
mixer.gain(0, 0.5f); // SOLO Dry gain
mixer.gain(1, 0.5f); // SOLO Wet gain
mixer.gain(1, 1.0f); // SOS gain
}
void loop() {
float potValue;
// Check if SW1 has been toggled (pushed) and trigger the gate
// LED1 will be directly control by the SOS effect, not by BAPhysicalControls
if (controls.isSwitchToggled(gateHandle)) {
sos.trigger();
Serial.println("GATE OPEN is triggered");
}
// Use SW2 to clear out the SOS delayline
controls.setOutput(led2Handle, controls.getSwitchValue(led2Handle));
if (controls.isSwitchToggled(clearHandle)) {
sos.clear();
Serial.println("GATE CLEAR is triggered");
}
// Use POT1 (left) to control the OPEN GATE time
if (controls.checkPotValue(openHandle, potValue)) {
// Pot has changed
sos.gateOpenTime(potValue * MAX_GATE_TIME_MS);
Serial.println(String("New OPEN GATE setting (ms): ") + (potValue * MAX_GATE_TIME_MS));
}
// Use POT2 (right) to control the feedback setting
if (controls.checkPotValue(closeHandle, potValue)) {
// Pot has changed
sos.gateOpenTime(potValue * MAX_GATE_TIME_MS);
Serial.println(String("New CLOSE GATE setting (ms): ") + (potValue * MAX_GATE_TIME_MS));
}
// Use POT3 (centre) to control the sos effect volume
if (controls.checkPotValue(volumeHandle, potValue)) {
// Pot has changed
Serial.println(String("New SOS VOLUME setting: ") + potValue);
sos.volume(potValue);
}
// Use the 'u' and 'd' keys to adjust headphone volume across ten levels.
if (Serial) {
if (Serial.available() > 0) {
while (Serial.available()) {
char key = Serial.read();
if (key == 'u') {
headphoneVolume = (headphoneVolume + 1) % MAX_HEADPHONE_VOL;
Serial.println(String("Increasing HEADPHONE volume to ") + headphoneVolume);
}
else if (key == 'd') {
headphoneVolume = (headphoneVolume - 1) % MAX_HEADPHONE_VOL;
Serial.println(String("Decreasing HEADPHONE volume to ") + headphoneVolume);
}
codec.setHeadphoneVolume(static_cast<float>(headphoneVolume) / static_cast<float>(MAX_HEADPHONE_VOL));
}
}
}
if (loopCount % 524288 == 0) {
Serial.print("Processor Usage, Total: "); Serial.print(AudioProcessorUsage());
Serial.print("% ");
Serial.print(" sos: "); Serial.print(sos.processorUsage());
Serial.println("%");
}
loopCount++;
}