338 lines
7.2 KiB
C++
338 lines
7.2 KiB
C++
#include <Audio.h>
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#include <Wire.h>
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#include <Adafruit_GFX.h>
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#include <Adafruit_SSD1306.h>
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#include <SparkFun_Qwiic_Button.h>
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#include <Adafruit_MPR121.h>
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#include <paj7620.h>
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#include "synth.h"
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#include "patches.h"
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#include "notes.h"
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#include "fingering.h"
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#define DRONES
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#define DEBUG
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#define KEY_OFFSET 2
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FMVoice Chanter;
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FMVoice Drones[3];
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FMVoice Regulators[3];
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AudioFilterBiquad biquad1;
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AudioMixer4 mixDrones;
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AudioMixer4 mixRegulators;
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AudioMixer4 mixL;
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AudioMixer4 mixR;
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AudioOutputI2S out1;
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AudioSynthNoiseWhite noise;
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AudioConnection FMVoicePatchCords[] = {
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//{0, 0, 0, 0}, // For some reason, the first one is ignored
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{noise, 0, mixDrones, 3},
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{noise, 0, mixL, 3},
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{noise, 0, mixR, 3},
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{Chanter.outputMixer, 0, biquad1, 0},
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{biquad1, 0, mixL, 0},
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{biquad1, 0, mixR, 0},
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{Drones[0].outputMixer, 0, mixDrones, 0},
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{Drones[1].outputMixer, 0, mixDrones, 1},
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{Drones[2].outputMixer, 0, mixDrones, 2},
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{mixDrones, 0, mixL, 1},
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{mixDrones, 0, mixR, 1},
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{Regulators[0].outputMixer, 0, mixRegulators, 0},
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{Regulators[1].outputMixer, 0, mixRegulators, 1},
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{Regulators[2].outputMixer, 0, mixRegulators, 2},
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{mixRegulators, 0, mixL, 2},
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{mixRegulators, 0, mixR, 2},
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{mixL, 0, out1, 0},
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{mixR, 0, out1, 1},
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FMVoiceWiring(Chanter),
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FMVoiceWiring(Drones[0]),
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FMVoiceWiring(Drones[1]),
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FMVoiceWiring(Drones[2]),
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FMVoiceWiring(Regulators[0]),
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FMVoiceWiring(Regulators[1]),
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FMVoiceWiring(Regulators[2]),
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};
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int currentPatch = 0;
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Adafruit_MPR121 cap = Adafruit_MPR121();
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Adafruit_SSD1306 display(128, 32, &Wire, -1);
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QwiicButton bag;
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bool use_bag;
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void blink(bool forever) {
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for (;;) {
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digitalWrite(LED_BUILTIN, true);
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delay(200);
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digitalWrite(LED_BUILTIN, false);
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delay(200);
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if (! forever) break;
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}
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}
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void setup() {
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pinMode(LED_BUILTIN, OUTPUT);
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digitalWrite(LED_BUILTIN, true);
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setupJustPitches(NOTE_D4, PITCH_D4);
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// Wire.begin needs a moment
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delay(100);
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Wire.begin();
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// Initialize gesture/proximity sensor
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if (paj7620Init()) {
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// XXX: Error handling
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}
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// Initialize display display
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if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3c)) {
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blink(true);
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}
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display.clearDisplay();
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display.setTextSize(1);
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display.setTextColor(SSD1306_WHITE);
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display.print("Starting");
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display.display();
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// Initialize bag
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bag.begin();
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use_bag = bag.isConnected();
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// Initialize touch sensor
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while (!cap.begin(0x5A)) {
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display.clearDisplay();
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display.setCursor(0, 0);
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display.print("Pipe?");
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display.display();
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blink(false);
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}
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// Set aside some memory for the audio library
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AudioMemory(120);
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// initialize tunables
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updateTunables(3, 0);
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// Initialize processor and memory measurements
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AudioProcessorUsageMaxReset();
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AudioMemoryUsageMaxReset();
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// Turn on drones
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for (int i=0; i<3; i++) {
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Drones[i].LoadPatch(&Bank[0]);
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Drones[i].NoteOn(JustPitches[NOTE_D4 - 12*i] + i);
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}
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// Turn on all mixer channels
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for (int i=0; i<4; i++) {
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mixL.gain(i, 0.5);
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mixR.gain(i, 0.6);
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}
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#ifdef DEBUG
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noise.amplitude(0.1);
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mixL.gain(3, 0.1);
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mixR.gain(3, 0.1);
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#endif
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}
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#define INIT_PITCH_ADJUST 0
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#define INIT_GAIN 0.7
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#define INIT_PATCH 0
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int16_t pitchAdjust;
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float chanterGain;
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int patch;
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void updateTunables(uint8_t buttons, int note) {
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// Pitch adjust if playing A
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if (!note || (note == NOTE_A4)) {
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switch (buttons) {
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case 3:
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pitchAdjust = INIT_PITCH_ADJUST;
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break;
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case 2:
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pitchAdjust += 4;
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break;
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case 1:
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pitchAdjust -= 4;
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break;
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}
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}
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float adj = pow(2, pitchAdjust / 32768.0);
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setupJustPitches(NOTE_D4, PITCH_D4*adj);
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if (!note || (note == NOTE_G4)) {
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// Volume adjust if playing G
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switch (buttons) {
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case 3:
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chanterGain = INIT_GAIN;
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break;
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case 2:
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chanterGain = min(chanterGain+0.005, 1.0);
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break;
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case 1:
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chanterGain = max(chanterGain-0.005, 0.0);
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break;
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}
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}
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for (int i=0; i<3; i++) {
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mixL.gain(i, chanterGain);
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mixR.gain(i, chanterGain);
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}
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if (!note || (note == NOTE_CS5)) {
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if (buttons == 3) {
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patch = INIT_PATCH;
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}
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// wrap
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int bankSize = sizeof(Bank) / sizeof(Bank[0]);
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patch = (patch + bankSize) % bankSize;
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FMPatch *p = &Bank[patch];
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Chanter.LoadPatch(p);
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display.clearDisplay();
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display.setCursor(0, 0);
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display.print(p->name);
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display.setCursor(0, 10);
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display.print("Patch ");
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display.print(patch);
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display.display();
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}
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}
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const uint8_t CLOSEDVAL = 0x30;
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const uint8_t OPENVAL = 0x70;
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const uint8_t GLISSANDO_STEPS = OPENVAL - CLOSEDVAL;
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uint8_t loopno = 0;
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uint8_t last_note = 0;
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void loop() {
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uint8_t keys = 0;
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uint8_t note;
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uint8_t glissandoKeys = 0;
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uint8_t glissandoNote;
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float glissandoOpenness = 0;
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bool silent = false;
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uint8_t paj_knee = 127;
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bool knee = false;
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loopno++;
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paj7620ReadReg(0x6c, 1, &paj_knee);
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if (paj_knee > 240) {
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knee = true;
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}
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for (int i = 0; i < 8; i++) {
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uint16_t val = max(cap.filteredData(i+KEY_OFFSET), CLOSEDVAL);
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float openness = ((val - CLOSEDVAL) / float(GLISSANDO_STEPS));
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// keys = all keys which are at least touched
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// glissandoKeys = all keys which are fully closed
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// The glissando operation computes the difference.
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if (openness < 1.0) {
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glissandoOpenness = max(glissandoOpenness, openness);
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bitSet(keys, i);
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if (openness == 0.0) {
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bitSet(glissandoKeys, i);
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}
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}
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}
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note = uilleann_matrix[keys];
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glissandoNote = uilleann_matrix[glissandoKeys];
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bool alt = note & 0x80;
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bool galt = glissandoNote & 0x80;
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note = note & 0x7f;
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glissandoNote = glissandoNote & 0x7f;
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// All keys closed + knee = no sound
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if (knee) {
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if (keys == 0xff) {
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silent = true;
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}
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}
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// Look up the note name
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char *note_name = NoteNames[note % 12];
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if (silent) {
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note_name = "-";
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}
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// Jump octave if the bag is squished
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//bag = !digitalRead(BAG);
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if (use_bag && bag.isPressed()) {
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if (keys & bit(7)) {
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note += 12;
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glissandoNote += 12;
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}
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}
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#if 0
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display.clearDisplay();
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display.setCursor(0, 0);
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display.print("mem: ");
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display.print(AudioMemoryUsageMax());
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display.print(" prx: ");
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display.print(paj_knee);
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display.setCursor(0, 24);
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display.print("Note: ");
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display.print(note);
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display.print(" n: ");
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display.print(loopno);
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display.display();
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return;
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#endif
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if (silent) {
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Chanter.NoteOff();
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} else {
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// Calculate pitch, and glissando pitch
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uint16_t pitch = JustPitches[note];
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uint16_t glissandoPitch = JustPitches[glissandoNote];
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if (alt) {
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biquad1.setLowShelf(0, 2000, 0.2, 1);
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} else {
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biquad1.setHighShelf(0, 1000, 1.0, 1);
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}
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// Bend pitch if fewer than 3 half steps away
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if (abs(glissandoNote - note) < 3) {
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float diff = glissandoPitch - pitch;
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pitch += diff * glissandoOpenness;
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}
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if (Chanter.playing) {
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Chanter.SetPitch(pitch);
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} else {
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Chanter.NoteOn(pitch);
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}
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}
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if (note != last_note) {
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display.clearDisplay();
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display.setCursor(0, 0);
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display.print(note_name);
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display.display();
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last_note = note;
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}
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}
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