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sugarflower/arduino_sound.md

Last active January 20, 2024 17:05
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arduino_sound.md

思い出のコード

今更使うかというと怪しい。もうそういう時代じゃない。
でもなんだかもったいない気がするのでコードを残しておく。

サンプリングを再生

よく覚えていないのだけど、pinModeでOUTPUTにしてるのは、3は解る。
10、11はOC1BとOC2Aなのでそのあとのコードといまいち整合性が取れていないような。
なにしろよく覚えていない。多分pin11に圧電スピーカーなんか繋ぐと音が出ると思われる。 ※pin8にタクトスイッチも忘れず。押すと鳴るようだ。

#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <avr/io.h>
#define CPU_FREQ 16000000L
#define SAMPLE_RATE 5512

PROGMEM const uint8_t table[] = {
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  0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,0x7e,0x7f,0x7f,
  0x7f,0x7f,0x7f,0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,
  0x7e,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7e,0x7f,0x7e,
  0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,
  0x7f,0x7f,0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7f,0x7e,0x7f,
  0x7f,0x7e,0x7f,0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,
  0x7f,0x7f,0x7f,0x7e,0x7e,0x7e,0x7e,0x7f,0x7e,0x7f,0x7e,0x7e,0x7f,0x7e,0x7e,0x7f,
  0x7f,0x7f,0x7f,0x7f,0x7f,0x7e,0x7e,0x7e,0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,
  0x7e,0x7f,0x7e,0x7f,0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,
  0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7e,0x7e,
  0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,0x7f,
  0x7f,0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,0x7f,0x7e,0x7e,0x7f,0x7e,0x7f,0x7e,0x7f,0x7f,
  0x7e,0x7e,0x7f,0x7e,0x7f,0x7e,0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7f,
  0x7f,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,
  0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,0x7e,
  0x7f,0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7e,
  0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,
  0x7e,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7e,0x7f,0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,0x7f,
  0x7e,0x7f,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,
  0x7e,0x7f,0x7e,0x7f,0x7f,0x7e,0x7f,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,
  0x7f,0x7e,0x7e,0x7e,0x7e,0x7e,0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7e,
  0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7f,
  0x7e,0x7f,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7f,
  0x7f,0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,
  0x7f,0x7f,0x7f,0x7e,0x7f,0x7e,0x7e,0x7e,0x7f,0x7e,0x7e,0x7e,0x7f,0x7e,0x7e,0x7e,
  0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,
  0x7f,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7e,0x7e,
  0x7f,0x7f,0x7e,0x7e,0x7f,0x7e,0x7e,0x7f,0x7e,0x7f,0x7e,0x7f,0x7e,0x7e,0x7f,0x7f,
  0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7e,0x7e,0x7f,0x7e,0x7e,
  0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,
  0x7f,0x7e,0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,
  0x7f,0x7f,0x7e,0x7e,0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7e,0x7e,0x7e,
  0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7e,0x7f,
  0x7e,0x7f,0x7e,0x7f,0x7e,0x7f,0x7e,0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,0x7e,
  0x7f,0x7e,0x7e,0x7f,0x7f,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7e,0x7f,0x7e,
  0x7f,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7f,
  0x7e,0x7e,0x7e,0x7e,0x7e,0x7f,0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7f,0x7e,0x7f,
  0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7e,0x7e,0x7e,0x7e,0x7e,
  0x7f,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,
  0x7f,0x7f,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7f,0x7f,
  0x7f,0x7f,0x7e,0x7f,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,
  0x7f,0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7e,0x7e,0x7f,
  0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,0x7f,0x7e,
  0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7f,0x7e,
  0x7e,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,
  0x7e,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7f,0x7f,0x7e,0x7e,0x7e,
  0x7e,0x7f,0x7e,0x7e,0x7f,0x7f,0x7f,0x7f,0x7f,0x7e,0x7e,0x7f,0x7f,0x7f,0x7e,0x7f,
  0x7f,0x7e,0x7f,0x7e,0x7e,0x7e,0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,0x7e,0x7e,
  0x7e,0x7e,0x7e,0x7e,0x7e,0x7f,0x7e,0x7f,0x7e,0x7f,0x7e,0x7f,0x7f,0x7f,0x7f,0x7e,
  0x7f,0x7e,0x7e,0x7f,0x7f,0x7f,0x7f,0xd2,0xe4,0xae,0xec,0xac,0xe2,0xc2,0xab,0x87,
  0xd6,0xd1,0x7f,0x7f
};

unsigned int tablesize = 5956;
unsigned int sp; // sound pointer
unsigned int pp;

void setup() {
  pinMode(3,OUTPUT);
  pinMode(10,OUTPUT);
  pinMode(11,OUTPUT);

  pinMode(8,INPUT_PULLUP);

  TCCR2A = 0xF3;
  TCCR2B = 0x01;
  OCR2A = 127;
  OCR2B = 127;

  TCCR1A = 0x00;
  TCCR1B = 0x09;
  TCCR1C = 0x00;
  TCNT1  = 0;
  OCR1A  = CPU_FREQ / SAMPLE_RATE;
  TIMSK1 = 0x02;
  sei();

  pp = 0;
}

void loop() {
  if( digitalRead(8) == LOW ){
    sp = 0;
    pp = 1;
  }
}

ISR(TIMER1_COMPA_vect){
  OCR2A = pgm_read_byte_near(table+sp);
  OCR2B = 127;

  sp = sp + pp;
  if(sp == tablesize){
    pp = 0;
    sp = 0;
  }
}

多分サイン波がなるやつ

サンプルレート22kで、440Hzのサイン波が鳴るというもの。
処理が遅いのでこれくらいがいいとこなのね。
一応頑張ればLFO * 3、OSC * 3、くらいは出来るんだけど、無理しないのが一番。
これもピンアウトが怪しい。でも動くはず。

#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <math.h>
#include <avr/io.h>

#define CPU_FREQ 16000000L
#define SAMPLE_RATE 22050
#define FREQ 440
#define SAMPLE_SIZE 50

int sp;
uint8_t table[SAMPLE_SIZE];

void setup() {
  pinMode(3,OUTPUT);
  pinMode(10,OUTPUT);
  pinMode(11,OUTPUT);

  float phase = PI*2 / SAMPLE_RATE * FREQ;
  float np;
  for(int i=0; i<SAMPLE_SIZE; i++){
    table[i] = int(sin( np + PI/180)*127 ) + 127;
    np += phase;
  }

  TCCR2A = 0xF3;
  TCCR2B = 0x01;
  OCR2A = 127;
  OCR2B = 127;

  TCCR1A = 0x00;
  TCCR1B = 0x09;
  TCCR1C = 0x00;
  TCNT1  = 0;
  OCR1A  = CPU_FREQ / SAMPLE_RATE;
  TIMSK1 = 0x02;
  sei();

  sp = 0;
}

void loop() {
}

ISR(TIMER1_COMPA_vect){
  OCR2A = table[sp];

  sp += 1;
  if(sp==SAMPLE_SIZE){
    sp = 0;
  }
}
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