82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
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/*Include file for ADSR synth project. */
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#include <avr/io.h> /* Defines pins, ports, etc */
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#include <util/delay.h> /* Functions to waste time */
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#include <avr/power.h>
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#include <avr/interrupt.h>
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#include "pinDefines.h"
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#include "macros.h"
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#include "scale.h"
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#include "fullSaw7.h" /* a 7-harmonic bandlimited sawtooth */
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/* see generateWavetables.py if you're interested */
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#include "fullTriangle.h"
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#include "USART.h"
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#define FULL_VOLUME 31 /* 5-bit volumes */
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// Default envelope values (slightly percussive)
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// Play around with these!
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#define ATTACK_RATE 8 /* 0-255 */
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#define DECAY_RATE 120 /* 0-255 */
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#define SUSTAIN_LEVEL 25 /* 0-255 */
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#define SUSTAIN_TIME 4000 /* 0-65535 */
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#define RELEASE_RATE 200 /* 0-65535 */
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// Compute these constants
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#define ATTACK_TIME ATTACK_RATE * FULL_VOLUME
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#define DECAY_TIME (ATTACK_TIME + (FULL_VOLUME-SUSTAIN_LEVEL) * DECAY_RATE)
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#define RELEASE_TIME DECAY_TIME + SUSTAIN_TIME
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// -------------- Init Routines --------------- //
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static inline void initTimer0(void){
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set_bit(TCCR0A, COM0A1); /* PWM output on OCR0A */
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set_bit(SPEAKER_DDR, SPEAKER); /* enable output on pin */
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set_bit(TCCR0A, WGM00); /* Fast PWM mode */
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set_bit(TCCR0A, WGM01); /* Fast PWM mode, pt.2 */
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set_bit(TCCR0B, CS00); /* Clock with /1 prescaler */
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}
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static inline void initLEDs(void){
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uint8_t i;
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LED_DDR = 0xff; /* All LEDs for diagnostics */
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for (i=0; i<8; i++){
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set_bit(LED_PORT, i);
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_delay_ms(100);
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clear_bit(LED_PORT, i);
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}
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}
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static inline uint16_t lookupPitch(char i){
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switch(i){
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case 'a':
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return(G1);
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case 's':
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return(A1);
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case 'd':
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return(B1);
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case 'f':
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return(C2);
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case 'g':
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return(D2);
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case 'h':
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return(E2);
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case 'j':
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return(F2);
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case 'k':
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return(G2);
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case 'l':
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return(A2);
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case ';':
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return(B2);
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case '\'':
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return(C3);
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}
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// Default value -- if press some other key
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return(C1);
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}
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