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