Removed OpenAudio test code.

Added midi-clock-handler code for syncing delay towards the midi clock.

MicroDexed.ino

@@ -24,7 +24,6 @@
 #include <limits.h>
 #include "config.h"
 #include <Audio.h>
-#include <OpenAudio_ArduinoLibrary.h>
 #include <Wire.h>
 #include <MIDI.h>
 #include <EEPROM.h>
@@ -44,9 +43,7 @@
 #include "UI.hpp"
 
 // Audio engines
-//AudioSynthDexed*     MicroDexed[NUM_DEXED];
+AudioSynthDexed*     MicroDexed[NUM_DEXED];
-AudioSynthDexed_F32*     MicroDexed[NUM_DEXED];
-AudioConvert_F32toI16*   convertf32toi16[NUM_DEXED];
 #if defined(USE_FX)
 AudioSynthWaveform*        chorus_modulator[NUM_DEXED];
 #if MOD_FILTER_OUTPUT != MOD_NO_FILTER_OUTPUT
@@ -179,9 +176,7 @@ AudioConnection * dynamicConnections[NUM_DEXED * 5];
 #endif
 void create_audio_engine_chain(uint8_t instance_id)
 {
-  //MicroDexed[instance_id] = new AudioSynthDexed(SAMPLE_RATE);
+  MicroDexed[instance_id] = new AudioSynthDexed(SAMPLE_RATE);
-  MicroDexed[instance_id] = new AudioSynthDexed_F32(SAMPLE_RATE);
-  convertf32toi16[instance_id] = new AudioConvert_F32toI16();
   mono2stereo[instance_id] = new AudioEffectMonoStereo();
 #if defined(USE_FX)
   chorus_modulator[instance_id] = new AudioSynthWaveform();
@@ -196,14 +191,10 @@ void create_audio_engine_chain(uint8_t instance_id)
 #endif
 
   dynamicConnections[nDynamic++] = new AudioConnection(*MicroDexed[instance_id], 0, microdexed_peak_mixer, instance_id);
-  //dynamicConnections[nDynamic++] = new AudioConnection(*MicroDexed[instance_id], 0, *convertf32toi16[instance_id], 0);
-  //dynamicConnections[nDynamic++] = new AudioConnection(*convertf32toi16[instance_id], 0, microdexed_peak_mixer, instance_id);
 
 #if defined(USE_FX)
   dynamicConnections[nDynamic++] = new AudioConnection(*MicroDexed[instance_id], 0, *chorus_mixer[instance_id], 0);
   dynamicConnections[nDynamic++] = new AudioConnection(*MicroDexed[instance_id], 0, *modchorus[instance_id], 0);
-  //dynamicConnections[nDynamic++] = new AudioConnection(*convertf32toi16[instance_id], 0, *chorus_mixer[instance_id], 0);
-  //dynamicConnections[nDynamic++] = new AudioConnection(*convertf32toi16[instance_id], 0, *modchorus[instance_id], 0);
 #if MOD_FILTER_OUTPUT != MOD_NO_FILTER_OUTPUT
   dynamicConnections[nDynamic++] = new AudioConnection(*chorus_modulator[instance_id], 0, *modchorus_filter[instance_id], 0);
   dynamicConnections[nDynamic++] = new AudioConnection(*modchorus_filter[instance_id], 0, *modchorus[instance_id], 1);
@@ -220,8 +211,7 @@ void create_audio_engine_chain(uint8_t instance_id)
   dynamicConnections[nDynamic++] = new AudioConnection(*mono2stereo[instance_id], 0, reverb_mixer_r, instance_id);
   dynamicConnections[nDynamic++] = new AudioConnection(*mono2stereo[instance_id], 1, reverb_mixer_l, instance_id);
 #else
-  //dynamicConnections[nDynamic++] = new AudioConnection(*MicroDexed[instance_id], 0, *mono2stereo[instance_id], 0);
+  dynamicConnections[nDynamic++] = new AudioConnection(*MicroDexed[instance_id], 0, *mono2stereo[instance_id], 0);
-  dynamicConnections[nDynamic++] = new AudioConnection(*convertf32toi16[instance_id], 0, *mono2stereo[instance_id], 0);
 #endif
   dynamicConnections[nDynamic++] = new AudioConnection(*mono2stereo[instance_id], 0, master_mixer_r, instance_id);
   dynamicConnections[nDynamic++] = new AudioConnection(*mono2stereo[instance_id], 1, master_mixer_l, instance_id);
@@ -230,9 +220,13 @@ void create_audio_engine_chain(uint8_t instance_id)
 uint8_t sd_card = 0;
 Sd2Card card;
 SdVolume volume;
-uint8_t midi_timing_counter = 0; // 24 per qarter
+uint8_t midi_ticks[10] = {0, 6, 9, 12, 18, 24, 36, 48, 72, 96};
-elapsedMillis midi_timing_timestep;
+uint8_t midi_bpm_counter = 0;
-uint16_t midi_timing_quarter = 0;
+elapsedMillis midi_bpm;
+#ifdef USE_FX
+uint8_t midi_timing_counter[NUM_DEXED];
+elapsedMillis midi_timing_timer[NUM_DEXED];
+#endif
 elapsedMillis long_button_pressed;
 elapsedMillis control_rate;
 uint8_t active_voices[NUM_DEXED];
@@ -327,7 +321,6 @@ void setup()
   setup_midi_devices();
 
   // Start audio system
-  AudioMemory_F32(AUDIO_MEM_F32, {44117.0, 128});
   AudioMemory(AUDIO_MEM);
 
 #if defined(TEENSY_AUDIO_BOARD)
@@ -467,7 +460,6 @@ void setup()
   // Initialize processor and memory measurements
   AudioProcessorUsageMaxReset();
   AudioMemoryUsageMaxReset();
-  AudioMemoryUsageMaxReset_F32();
 
 #ifdef DEBUG
   for (uint8_t instance_id = 0; instance_id < NUM_DEXED; instance_id++)
@@ -1382,21 +1374,49 @@ void handleTuneRequest(void)
 
 void handleClock(void)
 {
-  midi_timing_counter++;
-  if (midi_timing_counter % 24 == 0)
-  {
-    midi_timing_quarter = midi_timing_timestep;
-    midi_timing_counter = 0;
-    midi_timing_timestep = 0;
-    // Adjust delay control here
 #ifdef DEBUG
+  if (midi_bpm_counter % 24 == 0)
+  {
     Serial.print(F("MIDI Clock: "));
-    Serial.print(60000 / midi_timing_quarter, DEC);
+    Serial.print(60000.0f / midi_bpm, 2);
     Serial.print(F("bpm ("));
-    Serial.print(midi_timing_quarter, DEC);
+    Serial.print(midi_bpm, DEC);
     Serial.println(F("ms per quarter)"));
+    midi_bpm = 0;
+    midi_bpm_counter = 0;
+  }
+  midi_bpm_counter++;
 #endif
+
+#ifdef USE_FX
+  for (uint8_t instance_id = 0; instance_id < NUM_DEXED; instance_id++)
+  {
+    if (midi_ticks[configuration.fx.delay_sync[instance_id]] > 0)
+    {
+      /*
+        1   1/16  =  6 ticks
+        2   1/16T =  9 ticks
+        3   1/8   = 12 ticks
+        4   1/8T  = 18 ticks
+        5   1/4   = 24 ticks
+        6   1/4T  = 36 ticks
+        7   1/2   = 48 ticks
+        8   1/2T  = 72 ticks
+        9   1/1   = 96 ticks
+      */
+      if (midi_timing_counter[instance_id] % midi_ticks[configuration.fx.delay_sync[instance_id]] == 0)
+      {
+        int32_t t = midi_timing_timer[instance_id];
+        delay_fx[instance_id]->delay(0, constrain(t, DELAY_TIME_MIN, DELAY_TIME_MAX));
+        midi_timing_counter[instance_id] = 0;
+        midi_timing_timer[instance_id] = 0;
+      }
+      midi_timing_counter[instance_id]++;
+    }
   }
+#else
+  ;
+#endif
 }
 
 void handleStart(void)
@@ -1645,6 +1665,7 @@ void check_configuration(void)
     configuration.fx.delay_time[instance_id] = constrain(configuration.fx.delay_time[instance_id], DELAY_TIME_MIN, DELAY_TIME_MAX);
     configuration.fx.delay_feedback[instance_id] = constrain(configuration.fx.delay_feedback[instance_id], DELAY_FEEDBACK_MIN, DELAY_FEEDBACK_MAX);
     configuration.fx.delay_level[instance_id] = constrain(configuration.fx.delay_level[instance_id], DELAY_LEVEL_MIN, DELAY_LEVEL_MAX);
+    configuration.fx.delay_sync[instance_id] = constrain(configuration.fx.delay_sync[instance_id], DELAY_SYNC_MIN, DELAY_SYNC_MAX);
     configuration.fx.reverb_send[instance_id] = constrain(configuration.fx.reverb_send[instance_id], REVERB_SEND_MIN, REVERB_SEND_MAX);
   }
 }
@@ -1721,6 +1742,7 @@ void init_configuration(void)
     configuration.fx.delay_time[instance_id] = DELAY_TIME_DEFAULT / 10;
     configuration.fx.delay_feedback[instance_id] = DELAY_FEEDBACK_DEFAULT;
     configuration.fx.delay_level[instance_id] = DELAY_LEVEL_DEFAULT;
+    configuration.fx.delay_sync[instance_id] = DELAY_SYNC_DEFAULT;
     configuration.fx.reverb_send[instance_id] = REVERB_SEND_DEFAULT;
 
     configuration.performance.bank[instance_id] = SYSEXBANK_DEFAULT;
@@ -2241,12 +2263,6 @@ void show_cpu_and_mem_usage(void)
   Serial.print(AudioProcessorUsageMax(), 2);
   Serial.print(F("%|CPUMAXCNT:"));
   Serial.print(cpumax, DEC);
-  Serial.print(F("|MEM_F32:"));
-  Serial.print(AudioMemoryUsage_F32(), DEC);
-  Serial.print(F("|MEMMAX_F32:"));
-  Serial.print(AudioMemoryUsageMax_F32(), DEC);
-  Serial.print(F("|AUDIO_MEM_MAX_F32:"));
-  Serial.print(AUDIO_MEM_F32, DEC);
   Serial.print(F("|MEM:"));
   Serial.print(AudioMemoryUsage(), DEC);
   Serial.print(F("|MEMMAX:"));
@@ -2283,7 +2299,6 @@ void show_cpu_and_mem_usage(void)
 #endif
   AudioProcessorUsageMaxReset();
   AudioMemoryUsageMaxReset();
-  AudioMemoryUsageMaxReset_F32();
 }
 #endif
 
@@ -2325,6 +2340,7 @@ void show_configuration(void)
     Serial.print(F("  Delay Time           ")); Serial.println(configuration.fx.delay_time[instance_id], DEC);
     Serial.print(F("  Delay Feedback       ")); Serial.println(configuration.fx.delay_feedback[instance_id], DEC);
     Serial.print(F("  Delay Level          ")); Serial.println(configuration.fx.delay_level[instance_id], DEC);
+    Serial.print(F("  Delay Sync           ")); Serial.println(configuration.fx.delay_sync[instance_id], DEC);
     Serial.print(F("  Reverb Send          ")); Serial.println(configuration.fx.reverb_send[instance_id], DEC);
     Serial.print(F("  Sound Intensity      ")); Serial.println(configuration.dexed[instance_id].sound_intensity, DEC);
     Serial.print(F("  Panorama             ")); Serial.println(configuration.dexed[instance_id].pan, DEC);

UI.hpp

@@ -70,8 +70,7 @@ extern void change_disp_sd(bool d);
 #endif
 
 extern AudioControlSGTL5000       sgtl5000_1;
-//extern AudioSynthDexed*     MicroDexed[NUM_DEXED];
+extern AudioSynthDexed*           MicroDexed[NUM_DEXED];
-extern AudioSynthDexed_F32*     MicroDexed[NUM_DEXED];
 #if defined(USE_FX)
 extern AudioSynthWaveform*        chorus_modulator[NUM_DEXED];
 extern AudioEffectModulatedDelay* modchorus[NUM_DEXED];

config.h

@@ -351,7 +351,7 @@
 
 // HELPER MACROS
 #define TIME_MS2SAMPLES(x) floor(uint32_t(x) * AUDIO_SAMPLE_RATE / 1000) * sizeof(int16_t)
-#define SAMPLES2TIME_MS(x) float(uint32_t(x) * 1000 / AUDIO_SAMPLE_RATE * sizeof(int16_t) 
+#define SAMPLES2TIME_MS(x) float(uint32_t(x) * 1000 / AUDIO_SAMPLE_RATE * sizeof(int16_t)
 // Modulated delay options
 #define MOD_NO_FILTER_OUTPUT 0
 #define MOD_BUTTERWORTH_FILTER_OUTPUT 1
@@ -418,6 +418,10 @@
 #define DELAY_LEVEL_MAX 100
 #define DELAY_LEVEL_DEFAULT 0
 
+#define DELAY_SYNC_MIN 0
+#define DELAY_SYNC_MAX 9
+#define DELAY_SYNC_DEFAULT 0
+
 #define REVERB_ROOMSIZE_MIN 0
 #define REVERB_ROOMSIZE_MAX 100
 #define REVERB_ROOMSIZE_DEFAULT 0
@@ -643,6 +647,7 @@ typedef struct fx_s {
   uint8_t delay_time[MAX_DEXED];
   uint8_t delay_feedback[MAX_DEXED];
   uint8_t delay_level[MAX_DEXED];
+  uint8_t delay_sync[MAX_DEXED];
   uint8_t reverb_send[MAX_DEXED];
   uint8_t reverb_roomsize;
   uint8_t reverb_damping;

dexed_sd.h

@@ -30,8 +30,7 @@
 #define DEXED_SYSEX_H_INCLUDED
 
 extern uint8_t sd_card;
-//extern AudioSynthDexed*     MicroDexed[NUM_DEXED];
+extern AudioSynthDexed*     MicroDexed[NUM_DEXED];
-extern AudioSynthDexed_F32* MicroDexed[NUM_DEXED];
 extern void show_patch(uint8_t instance_id);
 
 extern void send_sysex_voice(uint8_t midi_channel, uint8_t* data);

synth_dexed.cpp

@@ -398,69 +398,6 @@ void Dexed::getSamples(uint16_t n_samples, int16_t* buffer)
   arm_float_to_q15(sumbuf, buffer, AUDIO_BLOCK_SAMPLES);
 }
 
-void Dexed::getSamples(uint16_t n_samples, float32_t* buffer)
-{
-  uint16_t i, j;
-  uint8_t note;
-  float s;
-  const double decayFactor = 0.99992;
-
-  if (refreshVoice)
-  {
-    for (i = 0; i < max_notes; i++)
-    {
-      if (voices[i].live)
-        voices[i].dx7_note->update(data, voices[i].midi_note, voices[i].velocity, voices[i].porta, &controllers);
-    }
-    lfo.reset(data + 137);
-    refreshVoice = false;
-  }
-
-  for (i = 0; i < n_samples; i += _N_)
-  {
-    AlignedBuf<int32_t, _N_> audiobuf;
-
-    for (uint8_t j = 0; j < _N_; ++j)
-    {
-      audiobuf.get()[j] = 0;
-      buffer[i + j] = 0.0;
-    }
-
-    int32_t lfovalue = lfo.getsample();
-    int32_t lfodelay = lfo.getdelay();
-
-    for (note = 0; note < max_notes; note++)
-    {
-      if (voices[note].live)
-      {
-        voices[note].dx7_note->compute(audiobuf.get(), lfovalue, lfodelay, &controllers);
-
-        for (j = 0; j < _N_; ++j)
-        {
-          buffer[i + j] += static_cast<float>(audiobuf.get()[j]) / 32768.0f;
-          audiobuf.get()[j] = 0;
-        }
-      }
-    }
-  }
-
-  fx.process(buffer, n_samples); // Needed for fx.Gain()!!!
-
-  // mild compression
-  for (i = 0; i < n_samples; i++)
-  {
-    s = abs(buffer[i]);
-    if (s > vuSignal)
-      vuSignal = s;
-    else if (vuSignal > 0.001f)
-      vuSignal *= decayFactor;
-    else
-      vuSignal = 0;
-  }
-
-  arm_scale_f32(buffer, 0.00015, buffer, AUDIO_BLOCK_SAMPLES);
-}
-
 void Dexed::keydown(int16_t pitch, uint8_t velo) {
   if ( velo == 0 ) {
     keyup(pitch);

synth_dexed.h

@@ -1214,50 +1214,3 @@ class AudioSynthDexed : public AudioStream, public Dexed {
   private:
     volatile bool in_update = false;
 };
-
-class AudioSynthDexed_F32 : public AudioStream_F32, public Dexed {
-  public:
-    const uint16_t audio_block_time_us = 1000000 / (SAMPLE_RATE / AUDIO_BLOCK_SAMPLES);
-    uint32_t xrun = 0;
-    uint16_t render_time_max = 0;
-
-    AudioSynthDexed_F32(int sample_rate) : AudioStream_F32(0, NULL), Dexed(sample_rate) { };
-
-    void update(void)
-    {
-      if (in_update == true)
-      {
-        xrun++;
-        return;
-      }
-      else
-        in_update = true;
-
-      elapsedMicros render_time;
-      audio_block_f32_t *lblock;
-
-      lblock = allocate_f32();
-
-      if (!lblock)
-      {
-        in_update = false;
-        return;
-      }
-
-      getSamples(AUDIO_BLOCK_SAMPLES, lblock->data);
-
-      if (render_time > audio_block_time_us) // everything greater audio_block_time_us (2.9ms for buffer size of 128) is a buffer underrun!
-        xrun++;
-
-      if (render_time > render_time_max)
-        render_time_max = render_time;
-
-      transmit(lblock, 0);
-      release(lblock);
-
-      in_update = false;
-    };
-
-  private:
-    volatile bool in_update = false;
-};