#include "beeps.h" #include #include #include #include #define PI 3.14159265 #define CHANNEL OCR1C volatile uint16_t sample; uint16_t lastSample; const int sounddata_length=200; const unsigned char sounddata_data[] PROGMEM = {128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 129, 127, 129, 128, 127, 133, 117, 109, 125, 121, 116, 132, 140, 126, 114, 114, 116, 120, 114, 93, 73, 66, 76, 116, 142, 129, 128, 129, 120, 119, 118, 104, 87, 123, 181, 194, 196, 198, 189, 176, 160, 162, 172, 164, 164, 183, 197, 188, 168, 167, 170, 165, 185, 209, 206, 196, 196, 199, 185, 162, 156, 167, 176, 173, 170, 166, 151, 142, 140, 134, 130, 127, 113, 86, 67, 66, 69, 75, 73, 75, 86, 90, 91, 84, 65, 48, 41, 30, 26, 56, 91, 88, 72, 70, 73, 82, 89, 73, 57, 60, 74, 89, 92, 77, 63, 60, 53, 47, 56, 64, 63, 61, 56, 54, 52, 36, 16, 22, 51, 66, 67, 70, 76, 88, 99, 92, 77, 74, 85, 100, 106, 97, 83, 85, 96, 108, 133, 160, 164}; void delay_us(int count) { while(count--) { _delay_us(1); } } void beeps() { // DDRB |= (1<<7); // PORTB &= ~(1<<7); // // Use full 16-bit resolution. // ICR1 = 0xFFFF; // // I could write a wall of text here to explain... but TL;DW // // Go read the ATmega32u4 datasheet. // // And this: http://blog.saikoled.com/post/43165849837/secret-konami-cheat-code-to-high-resolution-pwm-on // // Pin PB7 = OCR1C (Timer 1, Channel C) // // Compare Output Mode = Clear on compare match, Channel C = COM1C1=1 COM1C0=0 // // (i.e. start high, go low when counter matches.) // // WGM Mode 14 (Fast PWM) = WGM13=1 WGM12=1 WGM11=1 WGM10=0 // // Clock Select = clk/1 (no prescaling) = CS12=0 CS11=0 CS10=1 // TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; // TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; // // Turn off PWM control on PB7, revert to output low. // // TCCR1A &= ~(_BV(COM1C1)); // // CHANNEL = ((1 << level) - 1); // // Turn on PWM control of PB7 // TCCR1A |= _BV(COM1C1); // // CHANNEL = level << OFFSET | 0x0FFF; // // CHANNEL = 0b1010101010101010; // float x = 12; // float y = 24; // float length = 50; // float scale = 1; // // int f1 = 1000000/440; // // int f2 = 1000000/880; // // for (uint32_t i = 0; i < length * 1000; i++) { // // // int frequency = 1/((sin(PI*2*i*scale*pow(2, x/12.0))*.5+1 + sin(PI*2*i*scale*pow(2, y/12.0))*.5+1) / 2); // // ICR1 = f1; // Set max to the period // // OCR1C = f1 >> 1; // Set compare to half the period // // // _delay_us(10); // // } // int frequency = 1000000/440; // ICR1 = frequency; // Set max to the period // OCR1C = frequency >> 1; // Set compare to half the period // _delay_us(500000); // TCCR1A &= ~(_BV(COM1C1)); // CHANNEL = 0; play_notes(); // play_note(55*pow(2, 0/12.0), 1); // play_note(55*pow(2, 12/12.0), 1); // play_note(55*pow(2, 24/12.0), 1); // play_note(55*pow(2, 0/12.0), 1); // play_note(55*pow(2, 12/12.0), 1); // play_note(55*pow(2, 24/12.0), 1); // play_note(0, 4); // play_note(55*pow(2, 0/12.0), 8); // play_note(55*pow(2, 12/12.0), 4); // play_note(55*pow(2, 10/12.0), 4); // play_note(55*pow(2, 12/12.0), 8); // play_note(55*pow(2, 10/12.0), 4); // play_note(55*pow(2, 7/12.0), 2); // play_note(55*pow(2, 8/12.0), 2); // play_note(55*pow(2, 7/12.0), 16); // play_note(0, 4); // play_note(55*pow(2, 3/12.0), 8); // play_note(55*pow(2, 5/12.0), 4); // play_note(55*pow(2, 7/12.0), 4); // play_note(55*pow(2, 7/12.0), 8); // play_note(55*pow(2, 5/12.0), 4); // play_note(55*pow(2, 3/12.0), 4); // play_note(55*pow(2, 2/12.0), 16); } void play_note(float freq, int length) { DDRB |= (1<<7); PORTB &= ~(1<<7); if (freq > 0) { int frequency = 1000000/freq; ICR1 = frequency; // Set max to the period OCR1C = frequency >> 1; // Set compare to half the period TCCR1A = _BV(COM1C1) | _BV(WGM11); // = 0b00001010; TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // = 0b00011001; } for (int i = 0; i < length; i++) { _delay_us(50000); } TCCR1A &= ~(_BV(COM1C1)); } // This is called at 8000 Hz to load the next sample. ISR(TIMER1_COMPA_vect) { if (sample >= sounddata_length) { if (sample == sounddata_length + lastSample) { TIMSK1 &= ~_BV(OCIE1A); // Disable the per-sample timer completely. TCCR1B &= ~_BV(CS10); } else { OCR1C = sounddata_length + lastSample - sample; } } else { OCR1C = pgm_read_byte(&sounddata_data[sample]); } ++sample; } void play_notes() { // Set up Timer 2 to do pulse width modulation on the speaker // pin. DDRB |= (1<<7); PORTB &= ~(1<<7); // Use internal clock (datasheet p.160) // ASSR &= ~(_BV(EXCLK) | _BV(AS2)); // Set fast PWM mode (p.157) TCCR1A |= _BV(WGM21) | _BV(WGM20); TCCR1B &= ~_BV(WGM22); // Do non-inverting PWM on pin OC2A (p.155) // On the Arduino this is pin 11. TCCR1A = (TCCR2A | _BV(COM2A1)) & ~_BV(COM2A0); TCCR1A &= ~(_BV(COM2B1) | _BV(COM2B0)); // No prescaler (p.158) TCCR1B = (TCCR1B & ~(_BV(CS12) | _BV(CS11))) | _BV(CS10); // Set initial pulse width to the first sample. OCR1A = pgm_read_byte(&sounddata_data[0]); cli(); // Set CTC mode (Clear Timer on Compare Match) (p.133) // Have to set OCR1A *after*, otherwise it gets reset to 0! TCCR2B = (TCCR2B & ~_BV(WGM13)) | _BV(WGM12); TCCR2A = TCCR2A & ~(_BV(WGM11) | _BV(WGM10)); // No prescaler (p.134) TCCR2B = (TCCR2B & ~(_BV(CS12) | _BV(CS11))) | _BV(CS10); // Set the compare register (OCR1A). // OCR1A is a 16-bit register, so we have to do this with // interrupts disabled to be safe. // OCR2A = F_CPU / SAMPLE_RATE; // 16e6 / 8000 = 2000 OCR2A = 2000; // Enable interrupt when TCNT1 == OCR1A (p.136) TIMSK1 |= _BV(OCIE2A); sample = 0; sei(); } void note(int x, float length) { DDRB |= (1<<1); int t = (int)(440*pow(2,-x/12.0)); // starting note for (int y = 0; y < length*1000/t; y++) { // note length PORTB |= (1<<1); delay_us(t); PORTB &= ~(1<<1); delay_us(t); } PORTB &= ~(1<<1); } void true_note(float x, float y, float length) { for (uint32_t i = 0; i < length * 50; i++) { uint32_t v = (uint32_t) (round(sin(PI*2*i*640000*pow(2, x/12.0))*.5+1 + sin(PI*2*i*640000*pow(2, y/12.0))*.5+1) / 2 * pow(2, 8)); for (int u = 0; u < 8; u++) { if (v & (1 << u) && !(PORTB&(1<<1))) PORTB |= (1<<1); else if (PORTB&(1<<1)) PORTB &= ~(1<<1); } } PORTB &= ~(1<<1); }