neingeist/arduinisten
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slightly less borken...

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This commit is contained in:
entropia 2010-04-01 20:08:33 +02:00
parent 1c6ccf8eaf
commit 1d5191aafd
1 changed files with 17 additions and 15 deletions
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32
projekte/soundz/karplus_strong_totally_borken/karplus_strong_totally_borken.pde
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@ -43,24 +43,27 @@ void setup() {
int play (uint16_t f, uint8_t T) {
#define MAGIC_TUNE_FAC 3
#define DIVIDER 32
#define MAGIC_TUNE_FAC 6
if (f == REST) {
_delay_ms(T*1000/16*MAGIC_TUNE_FAC);
_delay_ms(T*1000/DIVIDER*MAGIC_TUNE_FAC);
} else {
sendKarplusStrongSound(f, T*MAGIC_TUNE_FAC);
}
}
// http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1249193795
int sendKarplusStrongSound(uint16_t f /*Hz*/, uint8_t T /* 1/16 sec*/) {
uint32_t sr = 11025;
// original source from http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1249193795
int sendKarplusStrongSound(uint16_t f /*Hz*/, uint8_t T /* 1/DIVIDER sec*/) {
uint16_t sr = 22050;
uint8_t N = sr/f;
//uint8_t N=32;
//uint32_t sr = (uint32_t) N*f;
// uint8_t N = 32;
// uint16_t sr = (uint16_t) N*f;
Serial.print("N = ");
Serial.print(N, DEC);
Serial.print("sr = ");
Serial.print(sr, DEC);
Serial.println();
unsigned long millis_alt = millis();
@ -70,19 +73,18 @@ int sendKarplusStrongSound(uint16_t f /*Hz*/, uint8_t T /* 1/16 sec*/) {
buf[i] = random(65536);
uint8_t bh = 0;
int Tloop = 18
; // FIXME: tune
int Tloop = 18; // FIXME: tune
int dt = (1000000ul)/sr - Tloop;
Serial.print("dt = ");
Serial.print(dt, DEC);
Serial.println();
for (uint32_t i=sr*T/16; i>0; i--) {
for (uint32_t i=(uint32_t) sr*T/DIVIDER; i>0; i--) {
// current amplitude to play is the highest byte of buf[bh]
#if 1
OCR2A = buf[bh] >> 8;
#if NOISEINDUSTRIAL
OCR2A = buf[bh];
#else
OCR2A = buf[bh];
OCR2A = buf[bh] >> 8;
#endif
// delay or do something else for <dt> usecs
@ -97,13 +99,13 @@ int sendKarplusStrongSound(uint16_t f /*Hz*/, uint8_t T /* 1/16 sec*/) {
}
// calculate avg
unsigned long avg = ((unsigned long) buf[bh] + (unsigned long) buf[nbh])/2;
uint32_t avg = ((uint32_t) buf[bh] + (uint32_t) buf[nbh])/2;
// with gain<1 (1020/1024 ~ 0.996)
avg *= 1020;
avg /= 1024;
// put back in buffer
buf[bh] = (int) avg;
buf[bh] = (uint16_t) avg;
bh = nbh;
}