159 lines
3.9 KiB
C++
159 lines
3.9 KiB
C++
/*
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Octavedown for pedal shield adapted from Stompshield
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Based on https://github.com/spamatica/arduino_stomp_shield_effects
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*/
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//defining harware resources.
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#define LED 13
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#define FOOTSWITCH 12
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#define TOGGLE 2
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#define PUSHBUTTON_1 A5
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#define PUSHBUTTON_2 A4
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//defining the output PWM parameters
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#define PWM_FREQ 0x00FF // pwm frequency - 31.3KHz
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#define PWM_MODE 0 // Fast (1) or Phase Correct (0)
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#define PWM_QTY 2 // 2 PWMs in parallel
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//#define B_MAX 100 // max value for rotary encoder input (min freq)
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//#define B_MIN 1 // min value for rotary encoder input (max freq)
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#define MIN_OUT -16383
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#define MAX_OUT 16383
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#define UP 0
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#define DOWN 1
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#define NO 0
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#define YES 10
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//byte button; // button checking timer
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//byte last_state; // last rotary encoder state
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byte counter = 10; // and start value
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byte looper=0;
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int oldInput;
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int inMaxVal = 0;
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int currDirection = UP;
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int passedFirst = NO;
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int l1=0;
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int l2=0;
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int input=0; // new input value
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int output=0; // calculated current output
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int oldOutput=0; // last output value
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int filtered=0; // current filtered value;
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int oldFiltered=0; // previousFiltered;
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int average;
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int outGate = 0;
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int counter2=0;
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void setup() {
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//setup IO
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pinMode(FOOTSWITCH, INPUT_PULLUP);
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pinMode(TOGGLE, INPUT_PULLUP);
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pinMode(PUSHBUTTON_1, INPUT_PULLUP);
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pinMode(PUSHBUTTON_2, INPUT_PULLUP);
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pinMode(LED, OUTPUT);
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// setup ADC
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ADMUX = 0x60; // left adjust, adc0, internal vcc
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ADCSRA = 0xe5; // turn on adc, ck/32, auto trigger
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ADCSRB = 0x07; // t1 capture for trigger
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DIDR0 = 0x01; // turn off digital inputs for adc0
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// setup PWM
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TCCR1A = (((PWM_QTY - 1) << 5) | 0x80 | (PWM_MODE << 1)); //
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TCCR1B = ((PWM_MODE << 3) | 0x11); // ck/1
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TIMSK1 = 0x20; // interrupt on capture interrupt
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ICR1H = (PWM_FREQ >> 8);
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ICR1L = (PWM_FREQ & 0xff);
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DDRB |= ((PWM_QTY << 1) | 0x02); // turn on outputs
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sei(); // turn on interrupts - not really necessary with arduino
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}
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void loop() {
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delay(200);
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}
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//sounds better if left untouched
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/*void checkButton()
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{
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//BUTTONS
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counter2++; //the pushbuttons are checked every 5000 times.
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if(counter2==5000)
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counter2=0;
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if (!digitalRead(PUSHBUTTON_1)) {
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if (counter > MIN_OUT) counter=counter-1; // if not at min, decrement
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}
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if (!digitalRead(PUSHBUTTON_2)) {
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if (counter < MAX_OUT) counter=counter+1; // if not at max, increment
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}
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}
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*/
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void highPassFilter() // frequency unknown ;)
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{
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int filterTemp = oldFiltered + output - oldOutput;
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filtered = output - (filterTemp/(2));
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// filteredArray[i] = alpha * (filteredArray[i-1] + data.recordedSamples[i] - data.recordedSamples[i-1]);
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}
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ISR(TIMER1_CAPT_vect)
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{
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// get ADC data
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byte temp1 = ADCL; // you need to fetch the low byte first
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byte temp2 = ADCH; // yes it needs to be done this way
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input = ((temp2 << 8) | temp1) + 0x8000; // make a signed 16b value
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// checkButton();
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if (input > inMaxVal)
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inMaxVal+=10;
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if (looper++ % 10 && input > 0 && input < inMaxVal)
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inMaxVal-=10;
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if (input < 0) // going \ past zero crossing
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if (oldInput >= 0)
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currDirection = currDirection ^ 1;
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// produce output data based on currDirection
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if (currDirection)
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output+=(counter<<5);
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else
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output-=(counter<<5);
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//calculate gate according to current input
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// if (outGate > maxVal) outGate = outGate -10;
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// if (outGate < minVal) outGate = outGate +10;
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if (inMaxVal < 1200) {
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outGate-=50;
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if (outGate < 0) outGate=0;
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}
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else
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outGate = MAX_OUT;
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// limit outvalue according to current gate
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if (output < -outGate) output=-outGate;
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if (output > outGate) output=outGate;
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highPassFilter();
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//filtered=output;
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// save data
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oldInput = input;
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oldOutput = output;
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oldFiltered = filtered;
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// output data
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OCR1AL = ((filtered >> 8) + 0x80);
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OCR1BL = filtered; // output the bottom byte
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}
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