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192 lines
7.4 KiB
192 lines
7.4 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 BAAudioEffectsTremolo effect. It can
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* be controlled using the Blackaddr Audio "Expansion Control Board".
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*
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* POT1 (left) controls amount of delay
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* POT2 (right) controls amount of feedback
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* POT3 (center) controls the wet/dry mix
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* SW1 will enable/bypass the audio effect. LED1 will be on when effect is enabled.
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* SW2 will cycle through the 3 pre-programmed analog filters. LED2 will be on when SW2 is pressed.
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*
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*
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* Using the Serial Montitor, send 'u' and 'd' characters to increase or decrease
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* the headphone volume between values of 0 and 9.
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*/
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#include "BALibrary.h"
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#include "BAEffects.h"
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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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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 delay, 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 delayOut(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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//////////////////////////////////////////
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// SETUP PHYSICAL CONTROLS
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// - POT1 (left) will control the rate
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// - POT2 (right) will control the depth
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// - POT3 (centre) will control the volume
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// - SW1 (left) will be used as a bypass control
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// - LED1 (left) will be illuminated when the effect is ON (not bypass)
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// - SW2 (right) will be used to cycle through the the waveforms
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// - LED2 (right) will illuminate when pressing SW2.
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//////////////////////////////////////////
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// To get the calibration values for your particular board, first run the
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// BAExpansionCalibrate.ino example and
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constexpr int potCalibMin = 1;
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constexpr int potCalibMax = 1018;
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constexpr bool potSwapDirection = true;
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// Create a control object using the number of switches, pots, encoders and outputs on the
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// Blackaddr Audio Expansion Board.
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BAPhysicalControls controls(BA_EXPAND_NUM_SW, BA_EXPAND_NUM_POT, BA_EXPAND_NUM_ENC, BA_EXPAND_NUM_LED);
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int loopCount = 0;
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unsigned waveformIndex = 0; // variable for storing which analog filter we're currently using.
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constexpr unsigned MAX_HEADPHONE_VOL = 10;
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unsigned headphoneVolume = 8; // control headphone volume from 0 to 10.
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// BAPhysicalControls returns a handle when you register a new control. We'll uses these handles when working with the controls.
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int bypassHandle, waveformHandle, rateHandle, depthHandle, volumeHandle, led1Handle, led2Handle; // Handles for the various controls
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void setup() {
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delay(100); // wait a bit for serial to be available
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Serial.begin(57600); // Start the serial port
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delay(100);
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TGA_PRO_EXPAND_REV2(); // Configure the expansion board revision
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// Setup the controls. The return value is the handle to use when checking for control changes, etc.
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// pushbuttons
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bypassHandle = controls.addSwitch(BA_EXPAND_SW1_PIN); // will be used for bypass control
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waveformHandle = controls.addSwitch(BA_EXPAND_SW2_PIN); // will be used for stepping through filters
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// pots
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rateHandle = controls.addPot(BA_EXPAND_POT1_PIN, potCalibMin, potCalibMax, potSwapDirection); // control the amount of delay
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depthHandle = controls.addPot(BA_EXPAND_POT2_PIN, potCalibMin, potCalibMax, potSwapDirection);
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volumeHandle = controls.addPot(BA_EXPAND_POT3_PIN, potCalibMin, potCalibMax, potSwapDirection);
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// leds
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led1Handle = controls.addOutput(BA_EXPAND_LED1_PIN);
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led2Handle = controls.addOutput(BA_EXPAND_LED2_PIN); // will illuminate when pressing SW2
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// Disable the audio codec first
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codec.disable();
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AudioMemory(128);
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// Enable and configure the codec
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Serial.println("Enabling codec...\n");
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codec.enable();
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codec.setHeadphoneVolume(1.0f); // Max headphone volume
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// Besure to enable the tremolo. When disabled, audio is is completely blocked by the effect
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// to minimize resource usage to nearly 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 using the controls on the Blackaddr Audio Expansion Board
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tremolo.bypass(false);
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tremolo.rate(0.0f);
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tremolo.depth(1.0f);
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//////////////////////////////////
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// Waveform selection //
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// These are commented out, in this example we'll use SW2 to cycle through the different filters
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//tremolo.setWaveform(Waveform::SINE); // The default waveform
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// Guitar cabinet: 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 loop() {
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float potValue;
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// Check if SW1 has been toggled (pushed)
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if (controls.isSwitchToggled(bypassHandle)) {
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bool bypass = tremolo.isBypass(); // get the current state
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bypass = !bypass; // change it
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tremolo.bypass(bypass); // set the new state
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controls.setOutput(led1Handle, !bypass); // Set the LED when NOT bypassed
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Serial.println(String("BYPASS is ") + bypass);
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}
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// Use SW2 to cycle through the waveforms
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controls.setOutput(led2Handle, controls.getSwitchValue(led2Handle));
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if (controls.isSwitchToggled(waveformHandle)) {
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waveformIndex = (waveformIndex + 1) % static_cast<unsigned>(Waveform::NUM_WAVEFORMS);
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// cast the index
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tremolo.setWaveform(static_cast<Waveform>(waveformIndex));
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Serial.println(String("Waveform set to ") + waveformIndex);
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}
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// Use POT1 (left) to control the rate setting
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if (controls.checkPotValue(rateHandle, potValue)) {
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// Pot has changed
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Serial.println(String("New RATE setting: ") + potValue);
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tremolo.rate(potValue);
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}
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// Use POT2 (right) to control the depth setting
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if (controls.checkPotValue(depthHandle, potValue)) {
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// Pot has changed
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Serial.println(String("New DEPTH setting: ") + potValue);
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tremolo.depth(potValue);
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}
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// Use POT3 (centre) to control the volume setting
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if (controls.checkPotValue(volumeHandle, potValue)) {
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// Pot has changed
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Serial.println(String("New VOLUME setting: ") + potValue);
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tremolo.volume(potValue);
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}
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// Use the 'u' and 'd' keys to adjust volume across ten levels.
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if (Serial) {
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if (Serial.available() > 0) {
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while (Serial.available()) {
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char key = Serial.read();
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if (key == 'u') {
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headphoneVolume = (headphoneVolume + 1) % MAX_HEADPHONE_VOL;
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Serial.println(String("Increasing HEADPHONE volume to ") + headphoneVolume);
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}
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else if (key == 'd') {
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headphoneVolume = (headphoneVolume - 1) % MAX_HEADPHONE_VOL;
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Serial.println(String("Decreasing HEADPHONE volume to ") + headphoneVolume);
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}
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codec.setHeadphoneVolume(static_cast<float>(headphoneVolume) / static_cast<float>(MAX_HEADPHONE_VOL));
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}
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}
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}
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// Use the loopCounter to roughly measure human timescales. Every few seconds, print the CPU usage
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// to the serial port. About 500,000 loops!
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//if (loopCount % 524288 == 0) {
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if (loopCount % 25000 == 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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}
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