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226 lines
9.4 KiB
226 lines
9.4 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 BAAudioEffectsAnalogDelay 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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* !!! SET POTS TO REASONABLE VALUES BEFORE STARTING TO AVOID SCREECHING FEEDBACK!!!!
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* - set POT1 (delay) fully counter-clockwise then increase it slowly.
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* - set POT2 (feedback) fully counter-clockwise, then increase it slowly
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* - set POT3 (wet/dry mix) to half-way at the detent.
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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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//#define USE_EXT // uncomment this line to use External MEM0
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#ifdef USE_EXT
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// If using external SPI memory, we will instantiate a SRAM
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// manager and create an external memory slot to use as the memory
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// for our audio delay
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ExternalSramManager externalSram;
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ExtMemSlot delaySlot; // Declare an external memory slot.
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// Instantiate the AudioEffectAnalogDelay to use external memory by
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/// passing it the delay slot.
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AudioEffectAnalogDelay analogDelay(&delaySlot);
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#else
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// If using internal memory, we will instantiate the AudioEffectAnalogDelay
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// by passing it the maximum amount of delay we will use in millseconds. Note that
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// audio delay lengths are very limited when using internal memory due to limited
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// internal RAM size.
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AudioEffectAnalogDelay analogDelay(200.0f); // set the max delay of 200 ms.
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// If you use external SPI memory you can get up to 1485.0f ms of delay!
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#endif
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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, analogDelay,0);
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AudioConnection delayOut(analogDelay, 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 amount of delay
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// - POT2 (right) will control the amount of feedback
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// - POT3 (centre) will control the wet/dry mix.
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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 three built in analog filter styles available.
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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 filterIndex = 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, filterHandle, delayHandle, feedbackHandle, mixHandle, 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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// Configure the hardware
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SPI_MEM0_1M();
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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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filterHandle = controls.addSwitch(BA_EXPAND_SW2_PIN); // will be used for stepping through filters
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// pots
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delayHandle = controls.addPot(BA_EXPAND_POT1_PIN, potCalibMin, potCalibMax, potSwapDirection); // control the amount of delay
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feedbackHandle = controls.addPot(BA_EXPAND_POT2_PIN, potCalibMin, potCalibMax, potSwapDirection);
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mixHandle = 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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// If using external memory request request memory from the manager
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// for the slot
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#ifdef USE_EXT
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Serial.println("Using EXTERNAL memory");
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// We have to request memory be allocated to our slot.
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externalSram.requestMemory(&delaySlot, 500.0f, MemSelect::MEM0, true);
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#else
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Serial.println("Using INTERNAL memory");
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#endif
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// Besure to enable the delay. 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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analogDelay.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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analogDelay.bypass(false);
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analogDelay.mix(0.5f);
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analogDelay.feedback(0.0f);
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//////////////////////////////////
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// AnalogDelay filter 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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//analogDelay.setFilter(AudioEffectAnalogDelay::Filter::DM3); // The default filter. Naturally bright echo (highs stay, lows fade away)
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//analogDelay.setFilter(AudioEffectAnalogDelay::Filter::WARM); // A warm filter with a smooth frequency rolloff above 2Khz
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//analogDelay.setFilter(AudioEffectAnalogDelay::Filter::DARK); // A very dark filter, with a sharp rolloff above 1Khz
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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 = analogDelay.isBypass(); // get the current state
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bypass = !bypass; // change it
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analogDelay.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 filters
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controls.setOutput(led2Handle, controls.getSwitchValue(led2Handle));
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if (controls.isSwitchToggled(filterHandle)) {
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filterIndex = (filterIndex + 1) % 3; // update and potentionall roll the counter 0, 1, 2, 0, 1, 2, ...
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// cast the index between 0 to 2 to the enum class AudioEffectAnalogDelay::Filter
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analogDelay.setFilter(static_cast<AudioEffectAnalogDelay::Filter>(filterIndex)); // will cycle through 0 to 2
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Serial.println(String("Filter set to ") + filterIndex);
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}
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// Use POT1 (left) to control the delay setting
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if (controls.checkPotValue(delayHandle, potValue)) {
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// Pot has changed
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Serial.println(String("New DELAY setting: ") + potValue);
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analogDelay.delayFractionMax(potValue);
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}
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// Use POT2 (right) to control the feedback setting
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if (controls.checkPotValue(feedbackHandle, potValue)) {
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// Pot has changed
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Serial.println(String("New FEEDBACK setting: ") + potValue);
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analogDelay.feedback(potValue);
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}
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// Use POT3 (centre) to control the mix setting
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if (controls.checkPotValue(mixHandle, potValue)) {
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// Pot has changed
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Serial.println(String("New MIX setting: ") + potValue);
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analogDelay.mix(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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Serial.print("Processor Usage, Total: "); Serial.print(AudioProcessorUsage());
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Serial.print("% ");
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Serial.print(" analogDelay: "); Serial.print(analogDelay.processorUsage());
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Serial.println("%");
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}
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loopCount++;
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}
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