Stripped-back fibomod

main
Mike Lynch 2024-02-11 14:56:11 +11:00
parent 43b41bde8f
commit 550e48402f
1 changed files with 63 additions and 0 deletions

View File

@ -0,0 +1,63 @@
// can fibomod make an interesting noise?
#include <Adafruit_MCP4728.h>
#include <Wire.h>
Adafruit_MCP4728 mcp;
unsigned int fibo = 43;
unsigned int a = 0;
unsigned int b = 1;
void setup() {
cli();
//set timer1 interrupt at 1Hz
TCCR1A = 0;// set entire TCCR1A register to 0
TCCR1B = 0;// same for TCCR1B
TCNT1 = 0;//initialize counter value to 0
// set compare match register for 1hz increments
//OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536)
//OCR1A = 7812;// = (16*10^6) / (1*1024) - 1 (must be <65536)
OCR1A = 1000;
// turn on CTC mode
TCCR1B |= (1 << WGM12);
// Set CS10 and CS12 bits for 1024 prescaler
TCCR1B |= (1 << CS12) | (1 << CS10);
// enable timer compare interrupt
TIMSK1 |= (1 << OCIE1A);
sei();
Serial.begin(115200);
if (!mcp.begin(0x64)) {
while (1) {
delay(100);
}
}
mcp.setSpeed(800000L);
}
ISR(TIMER1_COMPA_vect){
fibo = analogRead(A0);
if( fibo < 3 )
Serial.println(fibo);
}
void loop() {
unsigned int c = (a + b) % fibo;
a = b;
b = c;
mcp.fastWrite(a << 2, 0, 0, 0);
}