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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 BAAudioEffectsTremolo effect. It can
* be controlled using the Blackaddr Audio "Expansion Control Board".
*
* POT1 (left) controls amount of delay
* POT2 (right) controls amount of feedback
* POT3 (center) controls the wet/dry mix
* SW1 will enable/bypass the audio effect. LED1 will be on when effect is enabled.
* SW2 will cycle through the 3 pre-programmed analog filters. LED2 will be on when SW2 is pressed.
*
*
* Using the Serial Montitor, send 'u' and 'd' characters to increase or decrease
* the headphone volume between values of 0 and 9.
*/
#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"
#include "BAEffects.h"
using namespace BAEffects;
using namespace BALibrary;
AudioInputI2S i2sIn;
AudioOutputI2S i2sOut;
BAAudioControlWM8731 codec;
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 delay, and the output
// to both i2s channels
AudioConnection input(i2sIn,0, tremolo,0);
AudioConnection delayOut(tremolo, 0, cabFilter, 0);
AudioConnection leftOut(cabFilter,0, i2sOut, 0);
AudioConnection rightOut(cabFilter,0, i2sOut, 1);
//////////////////////////////////////////
// SETUP PHYSICAL CONTROLS
// - POT1 (left) will control the rate
// - POT2 (right) will control the depth
// - POT3 (centre) will control the volume
// - SW1 (left) will be used as a bypass control
// - LED1 (left) will be illuminated when the effect is ON (not bypass)
// - SW2 (right) will be used to cycle through the the waveforms
// - 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;
unsigned waveformIndex = 0; // variable for storing which analog filter we're currently using.
constexpr unsigned MAX_HEADPHONE_VOL = 10;
unsigned headphoneVolume = 8; // control headphone volume from 0 to 10.
// BAPhysicalControls returns a handle when you register a new control. We'll uses these handles when working with the controls.
int bypassHandle, waveformHandle, rateHandle, depthHandle, volumeHandle, led1Handle, led2Handle; // Handles for the various controls
void setup() {
delay(100); // wait a bit for serial to be available
Serial.begin(57600); // Start the serial port
delay(100);
// Setup the controls. The return value is the handle to use when checking for control changes, etc.
// pushbuttons
bypassHandle = controls.addSwitch(BA_EXPAND_SW1_PIN); // will be used for bypass control
waveformHandle = controls.addSwitch(BA_EXPAND_SW2_PIN); // will be used for stepping through filters
// pots
rateHandle = controls.addPot(BA_EXPAND_POT1_PIN, potCalibMin, potCalibMax, potSwapDirection); // control the amount of delay
depthHandle = 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 and configure the codec
Serial.println("Enabling codec...\n");
codec.enable();
codec.setHeadphoneVolume(1.0f); // Max headphone volume
// Besure to enable the tremolo. When disabled, audio is is completely blocked by the effect
// to minimize resource usage to nearly to nearly zero.
tremolo.enable();
// Set some default values.
// These can be changed using the controls on the Blackaddr Audio Expansion Board
tremolo.bypass(false);
tremolo.rate(0.0f);
tremolo.depth(1.0f);
//////////////////////////////////
// Waveform selection //
// These are commented out, in this example we'll use SW2 to cycle through the different filters
//tremolo.setWaveform(Waveform::SINE); // The default waveform
// Guitar cabinet: 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 loop() {
float potValue;
// Check if SW1 has been toggled (pushed)
if (controls.isSwitchToggled(bypassHandle)) {
bool bypass = tremolo.isBypass(); // get the current state
bypass = !bypass; // change it
tremolo.bypass(bypass); // set the new state
controls.setOutput(led1Handle, !bypass); // Set the LED when NOT bypassed
Serial.println(String("BYPASS is ") + bypass);
}
// Use SW2 to cycle through the waveforms
controls.setOutput(led2Handle, controls.getSwitchValue(led2Handle));
if (controls.isSwitchToggled(waveformHandle)) {
waveformIndex = (waveformIndex + 1) % static_cast<unsigned>(Waveform::NUM_WAVEFORMS);
// cast the index
tremolo.setWaveform(static_cast<Waveform>(waveformIndex));
Serial.println(String("Waveform set to ") + waveformIndex);
}
// Use POT1 (left) to control the rate setting
if (controls.checkPotValue(rateHandle, potValue)) {
// Pot has changed
Serial.println(String("New RATE setting: ") + potValue);
tremolo.rate(potValue);
}
// Use POT2 (right) to control the depth setting
if (controls.checkPotValue(depthHandle, potValue)) {
// Pot has changed
Serial.println(String("New DEPTH setting: ") + potValue);
tremolo.depth(potValue);
}
// Use POT3 (centre) to control the volume setting
if (controls.checkPotValue(volumeHandle, potValue)) {
// Pot has changed
Serial.println(String("New VOLUME setting: ") + potValue);
tremolo.volume(potValue);
}
// Use the 'u' and 'd' keys to adjust 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));
}
}
}
// Use the loopCounter to roughly measure human timescales. Every few seconds, print the CPU usage
// to the serial port. About 500,000 loops!
//if (loopCount % 524288 == 0) {
if (loopCount % 25000 == 0) {
Serial.print("Processor Usage, Total: "); Serial.print(AudioProcessorUsage());
Serial.print("% ");
Serial.print(" tremolo: "); Serial.print(tremolo.processorUsage());
Serial.println("%");
}
loopCount++;
}