neingeist/arduinisten
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This commit is contained in:
Eve Entropia 2010-04-02 02:54:42 +02:00
parent 1e4c30d62f
commit 43e3c04390
1 changed files with 70 additions and 18 deletions
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88
projekte/soundz/_8bit/_8bit.pde
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@ -38,10 +38,12 @@ const unsigned char sintab[] PROGMEM = {
0x09,0x07,0x05,0x03,0x02,0x01,0x01,0x01
};
volatile uint16_t sample[8]; // welches ist das nächste Sample aus der Sinustabelle
// welches ist das nächste Sample aus der Sinustabelle
// die oberen 7 bit zeigen in die Tabelle, die restlichen
// bits sind kommastellen
volatile uint16_t sample[8];
volatile uint8_t instrument[8];
uint16_t vol; // aktuelle Lautstärke
volatile uint16_t set_vol; // gewuenschte Lautstärke
@ -51,13 +53,32 @@ volatile uint16_t tone_[8]; // Tonhöhe in "Inkrementiereinheiten"
// Wert für die Tonausgabe
ISR(TIMER1_COMPA_vect) {
static int timer1counter; // Zähler um Lautstärkeänderung langsamer zu machen
int wert = 0;
uint8_t scale = 0;
// Wert an der Stelle sample1/512 aus der sinus-Tabelle lesen
for(int i=0; i<8; i++) {
wert += pgm_read_byte(&sintab[(sample[i] >> 9)]);
for(uint8_t i=0; i<8; i++) {
if (tone_[i] != 0) {
uint8_t index = sample[i] >> 9; // 0-127
if (instrument[i] == 0) {
wert += pgm_read_byte(&sintab[index]);
} else if (instrument[i] == 1) {
wert += index*2;
} else if (instrument[i] == 2) {
if (index < 64) {
wert += 0xff;
}
}
scale++;
}
};
wert/=8;
if (scale != 0) {
// wert/=scale;
wert/=4;
}
// Wert mit der aktuellen Lautstärke multiplizieren
wert = (wert * vol) / 256;
@ -66,7 +87,7 @@ ISR(TIMER1_COMPA_vect) {
// nächstes Sample in der Sinustabelle abhängig vom gewünschten
// Ton auswählen.
for(int i=0; i<8; i++) {
for(uint8_t i=0; i<8; i++) {
sample[i] += tone_[i];
};
@ -79,6 +100,7 @@ ISR(TIMER1_COMPA_vect) {
if (vol < set_vol) vol++;
if (vol > set_vol) vol--;
}
}
void startPlayback()
@ -123,8 +145,9 @@ void startPlayback()
TIMSK1 |= _BV(OCIE1A);
// Startwerte
for(int i=0; i<8; i++) {
for(uint8_t i=0; i<8; i++) {
sample[i] = 0;
tone_[i] = 0;
}
// Global Interrupts wieder einschalten.
@ -133,23 +156,52 @@ void startPlayback()
void setup()
{
Serial.begin(9600);
startPlayback();
}
#include "pitches.h"
void loop()
{
set_vol = 80;
set_vol = 128;
for(int counter = 1; counter<256; counter++) {
#define BLA ((128ul*512ul)/8000)
tone_[0] = (counter & _BV(0))?(NOTE_C4*BLA):0;
tone_[1] = (counter & _BV(1))?(NOTE_A3*BLA):0;
tone_[2] = (counter & _BV(2))?(NOTE_F3*BLA):0;
tone_[3] = (counter & _BV(2))?(NOTE_D3*BLA):0;
tone_[4] = (counter & _BV(2))?(NOTE_B2*BLA):0;
tone_[5] = (counter & _BV(2))?(NOTE_G2*BLA):0;
tone_[6] = (counter & _BV(2))?(NOTE_E2*BLA):0;
tone_[7] = (counter & _BV(2))?(NOTE_C2*BLA):0;
#define BLA(t) (2*(128ul*512ul*(t))/8000)
instrument[0] = 2;
instrument[1] = 2;
instrument[2] = 0;
instrument[3] = 0;
instrument[4] = 0;
instrument[5] = 1;
instrument[6] = 1;
instrument[7] = 1;
for(int counter = 0; counter<256; counter++) {
Serial.println(counter, BIN);
tone_[0] = (counter & _BV(0))?BLA(NOTE_C4):0;
tone_[1] = (counter & _BV(1))?BLA(NOTE_A3):0;
tone_[2] = (counter & _BV(2))?BLA(NOTE_F3):0;
tone_[3] = (counter & _BV(3))?BLA(NOTE_D3):0;
tone_[4] = (counter & _BV(4))?BLA(NOTE_B2):0;
tone_[5] = (counter & _BV(5))?BLA(NOTE_G2):0;
tone_[6] = (counter & _BV(6))?BLA(NOTE_E2):0;
tone_[7] = (counter & _BV(7))?BLA(NOTE_C2):0;
_delay_ms(200);
}
// fading away...
if (set_vol>0) {
set_vol--;
}
/* test code */
/*
tone_[0] = BLA(NOTE_C4);
_delay_ms(500);
tone_[0] = BLA(NOTE_C2);
_delay_ms(500);
*/
}