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@ -38,10 +38,12 @@ const unsigned char sintab[] PROGMEM = {
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0x09,0x07,0x05,0x03,0x02,0x01,0x01,0x01
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};
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volatile uint16_t sample[8]; // welches ist das nächste Sample aus der Sinustabelle
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// welches ist das nächste Sample aus der Sinustabelle
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// die oberen 7 bit zeigen in die Tabelle, die restlichen
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// bits sind kommastellen
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volatile uint16_t sample[8];
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volatile uint8_t instrument[8];
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uint16_t vol; // aktuelle Lautstärke
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volatile uint16_t set_vol; // gewuenschte Lautstärke
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@ -51,13 +53,32 @@ volatile uint16_t tone_[8]; // Tonhöhe in "Inkrementiereinheiten"
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// Wert für die Tonausgabe
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ISR(TIMER1_COMPA_vect) {
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static int timer1counter; // Zähler um Lautstärkeänderung langsamer zu machen
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int wert = 0;
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uint8_t scale = 0;
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// Wert an der Stelle sample1/512 aus der sinus-Tabelle lesen
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for(int i=0; i<8; i++) {
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wert += pgm_read_byte(&sintab[(sample[i] >> 9)]);
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for(uint8_t i=0; i<8; i++) {
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if (tone_[i] != 0) {
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uint8_t index = sample[i] >> 9; // 0-127
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if (instrument[i] == 0) {
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wert += pgm_read_byte(&sintab[index]);
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} else if (instrument[i] == 1) {
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wert += index*2;
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} else if (instrument[i] == 2) {
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if (index < 64) {
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wert += 0xff;
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}
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}
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scale++;
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}
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};
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wert/=8;
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if (scale != 0) {
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// wert/=scale;
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wert/=4;
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}
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// Wert mit der aktuellen Lautstärke multiplizieren
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wert = (wert * vol) / 256;
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@ -66,7 +87,7 @@ ISR(TIMER1_COMPA_vect) {
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// nächstes Sample in der Sinustabelle abhängig vom gewünschten
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// Ton auswählen.
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for(int i=0; i<8; i++) {
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for(uint8_t i=0; i<8; i++) {
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sample[i] += tone_[i];
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};
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@ -79,6 +100,7 @@ ISR(TIMER1_COMPA_vect) {
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if (vol < set_vol) vol++;
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if (vol > set_vol) vol--;
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}
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}
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void startPlayback()
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@ -123,8 +145,9 @@ void startPlayback()
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TIMSK1 |= _BV(OCIE1A);
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// Startwerte
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for(int i=0; i<8; i++) {
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for(uint8_t i=0; i<8; i++) {
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sample[i] = 0;
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tone_[i] = 0;
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}
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// Global Interrupts wieder einschalten.
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@ -133,23 +156,52 @@ void startPlayback()
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void setup()
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{
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Serial.begin(9600);
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startPlayback();
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}
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#include "pitches.h"
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void loop()
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{
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set_vol = 80;
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for(int counter = 1; counter<256; counter++) {
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#define BLA ((128ul*512ul)/8000)
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tone_[0] = (counter & _BV(0))?(NOTE_C4*BLA):0;
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tone_[1] = (counter & _BV(1))?(NOTE_A3*BLA):0;
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tone_[2] = (counter & _BV(2))?(NOTE_F3*BLA):0;
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tone_[3] = (counter & _BV(2))?(NOTE_D3*BLA):0;
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tone_[4] = (counter & _BV(2))?(NOTE_B2*BLA):0;
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tone_[5] = (counter & _BV(2))?(NOTE_G2*BLA):0;
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tone_[6] = (counter & _BV(2))?(NOTE_E2*BLA):0;
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tone_[7] = (counter & _BV(2))?(NOTE_C2*BLA):0;
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set_vol = 128;
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#define BLA(t) (2*(128ul*512ul*(t))/8000)
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instrument[0] = 2;
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instrument[1] = 2;
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instrument[2] = 0;
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instrument[3] = 0;
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instrument[4] = 0;
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instrument[5] = 1;
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instrument[6] = 1;
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instrument[7] = 1;
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for(int counter = 0; counter<256; counter++) {
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Serial.println(counter, BIN);
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tone_[0] = (counter & _BV(0))?BLA(NOTE_C4):0;
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tone_[1] = (counter & _BV(1))?BLA(NOTE_A3):0;
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tone_[2] = (counter & _BV(2))?BLA(NOTE_F3):0;
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tone_[3] = (counter & _BV(3))?BLA(NOTE_D3):0;
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tone_[4] = (counter & _BV(4))?BLA(NOTE_B2):0;
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tone_[5] = (counter & _BV(5))?BLA(NOTE_G2):0;
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tone_[6] = (counter & _BV(6))?BLA(NOTE_E2):0;
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tone_[7] = (counter & _BV(7))?BLA(NOTE_C2):0;
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_delay_ms(200);
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}
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// fading away...
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if (set_vol>0) {
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set_vol--;
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}
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/* test code */
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/*
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tone_[0] = BLA(NOTE_C4);
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_delay_ms(500);
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tone_[0] = BLA(NOTE_C2);
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_delay_ms(500);
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*/
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}
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