/************************************************************************* * 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. * * POT1 - Gate open time. Middle position (detent) is about 2100 ms. * POT2 - gate close time. Middle position (detent) is about 2100 ms. * POT3 - Effect volume. Controls the volume of the SOS effect separate from the normal volume * SW1 - Strum and hold a chord then push this button. Continue holding the button until the LED1 light goes out. * SW2 - Push this button to clear out the sound circulating in the delay. * */ #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; // 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 CLOSE GATE time if (controls.checkPotValue(closeHandle, potValue)) { // Pot has changed sos.gateCloseTime(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(headphoneVolume) / static_cast(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++; }