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185 lines
4.2 KiB
Plaintext
185 lines
4.2 KiB
Plaintext
#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/delay.h>
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#define REST -1
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// number of timer0 overflows/sec
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#define INT_PER_SEC F_CPU/1/256
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volatile uint32_t intrs = 0;
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volatile int32_t curNote = REST;
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// TIMER0 overflow
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ISR(TIMER0_OVF_vect) {
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if (curNote == REST) {
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intrs = 0;
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} else {
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intrs++;
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if (intrs >= curNote) {
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PORTD ^= _BV(PD4);
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intrs = 0;
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}
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}
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}
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void arpeggio_play(int32_t note, uint32_t len) {
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// FIXME: curNote is in interrupts, note is in hertz...
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curNote = INT_PER_SEC/note/2;
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// len is in PC clock ticks * 10
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// clock tick is 1s/18.2 == 54ms
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#define MAGIC_CLOCK_TICK 54
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#define MAGIC_DELAY_FACTOR 400 // well, should be 1000 us?!
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#define MAGIC_BREATH 50
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_delay_us(MAGIC_DELAY_FACTOR*(len*MAGIC_CLOCK_TICK/10));
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// breath
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curNote=REST;
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_delay_us(50);
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}
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void arpeggio(int32_t n1, int32_t n2, int32_t n3, int32_t len) {
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for (int32_t i = 0; i < len; i++) {
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arpeggio_play(n1, len);
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arpeggio_play(n2, len);
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arpeggio_play(n3, len);
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}
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}
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int main(void) {
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/* setup clock divider. Timer0 overflows on counting to 256.
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* 16Mhz / 1 (CS0=1) = 16000000 increments/sec. Overflows every 256.
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*/
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TCCR0B |= _BV(CS00);
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// enable overflow interrupts
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TIMSK0 |= _BV(TOIE0);
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// PD4 as output
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DDRD = _BV(PD4);
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TCNT0 = 0;
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intrs = 0;
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curNote = REST;
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// enable interrupts
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sei();
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for(;;) {
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arpeggio(261,329,130,7);
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arpeggio(329,392,130,4);
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arpeggio(329,392,130,6);
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arpeggio(329,392,123,6);
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arpeggio(261,329,110,7);
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arpeggio(329,392,110,4);
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arpeggio(493,392,110,4);
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arpeggio(523,440,110,4);
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arpeggio(440,349,110,6);
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arpeggio(293,246,146,7);
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arpeggio(329,261,146,4);
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arpeggio(349,293,146,6);
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arpeggio(293,246,146,6);
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arpeggio(246,196,99,7);
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arpeggio(261,220,99,4);
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arpeggio(293,246,99,6);
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arpeggio(246,196,99,6);
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arpeggio(261,329,130,7);
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arpeggio(329,392,130,4);
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arpeggio(329,392,130,6);
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arpeggio(329,392,123,6);
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arpeggio(262,329,110,7);
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arpeggio(329,392,110,4);
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arpeggio(493,392,110,4);
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arpeggio(523,440,110,4);
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arpeggio(440,349,110,6);
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arpeggio(293,246,146,7);
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arpeggio(329,261,146,4);
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arpeggio(349,293,146,6);
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arpeggio(246,196,99,6);
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arpeggio(261,329,110,6);
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arpeggio(261,329,110,6);
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arpeggio(261,329,110,6);
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arpeggio(246,196,99,6);
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arpeggio(174,220,82,6);
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arpeggio(174,220,82,6);
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arpeggio(174,220,82,6);
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arpeggio(246,196,99,6);
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arpeggio(261,329,110,6);
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arpeggio(261,329,110,6);
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arpeggio(261,329,110,6);
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arpeggio(261,329,110,6);
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arpeggio(261,329,110,6);
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arpeggio(261,329,110,6);
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arpeggio(261,329,110,6);
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}
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}
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/*
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10 REM ARPEGGIO BY JIM LEONARD 5/8/1984
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15 WIDTH 80:SCREEN 0,0,0:KEY OFF
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20 READ N1,N2,N3,D:ON ERROR GOTO 10000
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30 FOR I = 1 TO D
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40 SOUND N1,D*.1
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50 SOUND N2,D*.1
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60 SOUND N3,D*.1
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70 NEXT
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80 GOTO 20
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300 DATA 261,329,130,7
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310 DATA 329,392,130,4
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320 DATA 329,392,130,6
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330 DATA 329,392,123,6
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340 DATA 261,329,110,7
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350 DATA 329,392,110,4
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360 DATA 493,392,110,4
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370 DATA 523,440,110,4
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375 DATA 440,349,110,6
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380 DATA 293,246,146,7
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390 DATA 329,261,146,4
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400 DATA 349,293,146,6
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410 DATA 293,246,146,6
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420 DATA 246,196,99,7
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430 DATA 261,220,99,4
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440 DATA 293,246,99,6
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450 DATA 246,196,99,6
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500 DATA 261,329,130,7:REM REPEAT (ALMOST)
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510 DATA 329,392,130,4
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520 DATA 329,392,130,6
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530 DATA 329,392,123,6
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540 DATA 261,329,110,7
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550 DATA 329,392,110,4
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560 DATA 493,392,110,4
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570 DATA 523,440,110,4
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575 DATA 440,349,110,6
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580 DATA 293,246,146,7
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590 DATA 329,261,146,4
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600 DATA 349,293,146,6
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620 DATA 246,196,99,6
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630 DATA 261,329,110,6
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640 DATA 261,329,110,6
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645 DATA 261,329,110,6
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650 DATA 246,196,99,6
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660 DATA 174,220,82,6
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670 DATA 174,220,82,6
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680 DATA 174,220,82,6
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690 DATA 246,196,99,6
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700 DATA 261,329,110,6
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710 DATA 261,329,110,6
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720 DATA 261,329,110,6
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730 DATA 261,329,110,6
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740 DATA 261,329,110,6
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750 DATA 261,329,110,6
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760 DATA 261,329,110,6
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10000 LOCATE 24,1:END
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*/
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