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MicroDexed
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Fixed summing of signals as integers.

Browse Source 
Added midinotes.h.
Added overload detection.
Small fixes.
pull/4/head
Holger Wirtz 7 years ago
parent c2e0bfe632
commit d22840823f
4 changed files with 137 additions and 25 deletions
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  1. 20
      MicroDexed.ino
  2. 9
      config.h
  3. 36
      dexed.cpp
  4. 97
      midinotes.h

20
MicroDexed.ino
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@ -46,6 +46,8 @@ MIDI_CREATE_INSTANCE(HardwareSerial, Serial1, MIDI);
Dexed* dexed = new Dexed(SAMPLE_RATE);
bool sd_card_available = false;
uint8_t bank = DEFAULT_SYSEXBANK;
uint32_t xrun = 0;
uint32_t overload = 0;
#ifdef MASTER_KEY_MIDI
bool master_key_enabled = false;
@ -159,16 +161,11 @@ void loop()
if (!queue1.available())
continue;
#if defined(SHOW_DEXED_TIMING) || defined(SHOW_XRUN)
elapsedMicros t1;
#endif
dexed->getSamples(AUDIO_BLOCK_SAMPLES, audio_buffer);
#ifdef SHOW_XRUN
uint32_t t2 = t1;
if (t2 > 2900) // everything greater 2.9ms is a buffer underrun!
Serial.println(F("XRUN"));
#endif
xrun++;
#ifdef SHOW_DEXED_TIMING
Serial.println(t1, DEC);
#endif
@ -209,8 +206,7 @@ void handle_midi_input(void)
void note_on(void)
{
randomSeed(analogRead(A0));
queue_midi_event(0x90, TEST_NOTE, random(TEST_VEL_MIN, TEST_VEL_MAX));
// 1
queue_midi_event(0x90, TEST_NOTE, random(TEST_VEL_MIN, TEST_VEL_MAX)); // 1
queue_midi_event(0x90, TEST_NOTE + 5, random(TEST_VEL_MIN, TEST_VEL_MAX)); // 2
queue_midi_event(0x90, TEST_NOTE + 8, random(TEST_VEL_MIN, TEST_VEL_MAX)); // 3
queue_midi_event(0x90, TEST_NOTE + 12, random(TEST_VEL_MIN, TEST_VEL_MAX)); // 4
@ -328,12 +324,12 @@ bool queue_midi_event(uint8_t type, uint8_t data1, uint8_t data2)
if (type == 0x80 && data1 == MASTER_KEY_MIDI) // Master key released
{
master_key_enabled = false;
Serial.println("Master key disabled");
Serial.println(F("Master key disabled"));
}
else if (type == 0x90 && data1 == MASTER_KEY_MIDI) // Master key pressed
{
master_key_enabled = true;
Serial.println("Master key enabled");
Serial.println(F("Master key enabled"));
}
else
{
@ -469,6 +465,10 @@ void show_cpu_and_mem_usage(void)
Serial.print(AudioMemoryUsage(), DEC);
Serial.print(F(" MEM MAX:"));
Serial.print(AudioMemoryUsageMax(), DEC);
Serial.print(F(" XRUN:"));
Serial.print(xrun, DEC);
Serial.print(F(" OVERLOAD:"));
Serial.print(overload, DEC);
Serial.println();
AudioProcessorUsageMaxReset();
AudioMemoryUsageMaxReset();

9
config.h
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@ -21,9 +21,10 @@
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "midinotes.h"
//#define TEST_MIDI 1
#define TEST_NOTE 40
#define TEST_NOTE MIDI_E2
#define TEST_VEL_MIN 60
#define TEST_VEL_MAX 110
@ -43,12 +44,12 @@
#define DEFAULT_SYSEXBANK 0
#define DEFAULT_SYSEXSOUND 0
#define MASTER_KEY_MIDI 84 // C6
#define MASTER_NUM1 24 // C1
#define MASTER_BANK_SELECT 83 // B5
#define MASTER_KEY_MIDI MIDI_C6
#define MASTER_NUM1 MIDI_C1
#define USE_TEENSY_DSP 1
#define SUM_UP_AS_INT 1
#define REDUCE_LOUDNESS 2
// Use these with the Teensy Audio Shield
#define SDCARD_CS_PIN 10

36
dexed.cpp
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@ -39,6 +39,7 @@
#endif
extern uint8_t bank;
extern uint32_t overload;
extern bool load_sysex(uint8_t bank, uint8_t voice_number);
Dexed::Dexed(int rate)
@ -142,6 +143,9 @@ void Dexed::getSamples(uint16_t n_samples, int16_t* buffer)
int32_t lfovalue = lfo.getsample();
int32_t lfodelay = lfo.getdelay();
#ifdef SUM_UP_AS_INT
int32_t sum;
#endif
for (uint8_t note = 0; note < max_notes; ++note) {
if (voices[note].live) {
@ -154,24 +158,34 @@ void Dexed::getSamples(uint16_t n_samples, int16_t* buffer)
#else
int32_t clip_val = val < -(1 << 24) ? 0x8000 : val >= (1 << 24) ? 0x7fff : val >> 9;
#endif
if (clip_val != (val>>9))
overload++;
#ifdef SUM_UP_AS_INT
int32_t tmp = buffer[i + j] + (clip_val >> 1);
if (buffer[i + j] > 0 && clip_val > 0)
sum = buffer[i + j] + (clip_val >> REDUCE_LOUDNESS);
/*
if (buffer[i + j] > 0 && clip_val > 0 && sum < 0)
{
if ((tmp < buffer[i + j]) && (tmp < clip_val))
tmp = 0x8000;
sum = 0x8000;
}
else if (buffer[i + j] < 0 && clip_val < 0)
else if (buffer[i + j] < 0 && clip_val < 0 && sum > 0)
{
if ((tmp > buffer[i + j]) && (tmp > clip_val))
tmp = 0x7FFF;
sum = 0x7FFF;
}
buffer[i + j] = tmp;
*/
buffer[i + j] = sum;
audiobuf.get()[j] = 0;
#else
float f = static_cast<float>(clip_val >> 1) / 0x8000;
if (f > 1) f = 1;
if (f < -1) f = -1;
float f = static_cast<float>(clip_val >> REDUCE_LOUDNESS) / 0x8000;
if (f > 1)
{
f = 1;
overload++;
}
else if (f < -1)
{
f = -1;
overload++;
}
sumbuf[j] += f;
audiobuf.get()[j] = 0;
#endif

97
midinotes.h
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@ -0,0 +1,97 @@
/*************************************************
* MIDI note values
*************************************************/
#ifndef _MIDINOTES_H
#define _MIDINOTES_H
#define MIDI_A0 21
#define MIDI_AIS0 22
#define MIDI_B0 23
#define MIDI_C1 24
#define MIDI_CIS1 25
#define MIDI_D1 26
#define MIDI_DIS1 27
#define MIDI_E1 28
#define MIDI_F1 29
#define MIDI_FIS1 30
#define MIDI_G1 31
#define MIDI_GIS1 32
#define MIDI_A1 33
#define MIDI_AIS1 34
#define MIDI_B1 35
#define MIDI_C2 36
#define MIDI_CIS2 37
#define MIDI_D2 38
#define MIDI_DIS2 39
#define MIDI_E2 40
#define MIDI_F2 41
#define MIDI_FIS2 42
#define MIDI_G2 43
#define MIDI_GIS2 44
#define MIDI_A2 45
#define MIDI_AIS2 46
#define MIDI_B2 47
#define MIDI_C3 48
#define MIDI_CIS3 49
#define MIDI_D3 50
#define MIDI_DIS3 51
#define MIDI_E3 52
#define MIDI_F3 53
#define MIDI_FIS3 54
#define MIDI_G3 55
#define MIDI_GIS3 56
#define MIDI_A3 57
#define MIDI_AIS3 58
#define MIDI_B3 59
#define MIDI_C4 60
#define MIDI_CIS4 61
#define MIDI_D4 62
#define MIDI_DIS4 63
#define MIDI_E4 64
#define MIDI_F4 65
#define MIDI_FIS4 66
#define MIDI_G4 67
#define MIDI_GIS4 68
#define MIDI_A4 69
#define MIDI_AIS4 70
#define MIDI_B4 71
#define MIDI_C5 72
#define MIDI_CIS5 73
#define MIDI_D5 74
#define MIDI_DIS5 75
#define MIDI_E5 76
#define MIDI_F5 77
#define MIDI_FIS5 78
#define MIDI_G5 79
#define MIDI_GIS5 80
#define MIDI_A5 81
#define MIDI_AIS5 82
#define MIDI_B5 83
#define MIDI_C6 84
#define MIDI_CIS6 85
#define MIDI_D6 86
#define MIDI_DIS6 87
#define MIDI_E6 88
#define MIDI_F6 89
#define MIDI_FIS6 90
#define MIDI_G6 91
#define MIDI_GIS6 92
#define MIDI_A6 93
#define MIDI_AIS6 94
#define MIDI_B6 95
#define MIDI_C7 96
#define MIDI_CIS7 97
#define MIDI_D7 98
#define MIDI_DIS7 99
#define MIDI_E7 100
#define MIDI_F7 101
#define MIDI_FIS7 102
#define MIDI_G7 103
#define MIDI_GIS7 104
#define MIDI_A7 105
#define MIDI_AIS7 106
#define MIDI_B7 107
#define MIDI_C8 108
#endif
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