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-rw-r--r--keyboard/preonic/beeps.c238
1 files changed, 238 insertions, 0 deletions
diff --git a/keyboard/preonic/beeps.c b/keyboard/preonic/beeps.c
new file mode 100644
index 0000000000..13e46e1daf
--- /dev/null
+++ b/keyboard/preonic/beeps.c
@@ -0,0 +1,238 @@
+#include "beeps.h"
+#include <math.h>
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+#include <avr/io.h>
+
+#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);
+} \ No newline at end of file
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