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| Original file line number | Diff line number | Diff line change |
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| @@ -1,38 +1,14 @@ | ||
| # Clock | ||
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| ## [Writeup and documentation](https://rabid.audio/projects/synth/clk/) | ||
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| - LED 7-segment display | ||
| - Knob: continuous rotary selector | ||
| - rotary encoder | ||
| - Swing control | ||
| - Out | ||
| - subdivision out | ||
| - LED blink on clock | ||
| - Tap tempo | ||
| - CV in | ||
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| States: | ||
| Main State: | ||
| - Display: current BPM (35-287) | ||
| - Dots: show beats | ||
| - knob: BPM | ||
| - press button B: tap tempo | ||
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| swing control state (hold button A): | ||
| - Display: swing amount (0-100%) | ||
| - knob: swing amount | ||
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| Subdivision state (hold button B): | ||
| - Display: number of subdivisions 1-16 | ||
| - knob: controls subdivision amount | ||
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| Reset (hold both A and B): | ||
| - Display: 000 | ||
| - Freeze clock | ||
| - Restart subdivisions | ||
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| Full Reset (hold both A and B for 2 seconds): | ||
| - Display: blink 000 | ||
| - Restart subdivisions | ||
| - Restore default settings | ||
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| https://en.wikipedia.org/wiki/Swing_(jazz_performance_style) | ||
| https://github.com/adafruit/TinyWireM/blob/master/USI_TWI_Master.h |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,83 @@ | ||
| #pragma once | ||
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| #include <Arduino.h> | ||
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| #define ROT_A bit(1) | ||
| #define ROT_B bit(2) | ||
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| void enableInterrupts(pin) | ||
| { | ||
| *digitalPinToPCMSK(pin) |= bit(digitalPinToPCMSKbit(pin)); // enable pin | ||
| PCIFR |= bit(digitalPinToPCICRbit(pin)); // clear outstanding interrupt | ||
| PCICR |= bit(digitalPinToPCICRbit(pin)); // enable interrupt for group | ||
| } | ||
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| // A class for reading incremental rotary encoder rotations | ||
| // and reporting changes using pin change interrupts. | ||
| // Assumes pins are active low. | ||
| class _RotaryEncoder | ||
| { | ||
| private: | ||
| uint8_t _aPin; | ||
| uint8_t _bPin; | ||
| bool _aState; | ||
| bool _aPrevState; | ||
| volatile int8_t _counter; | ||
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| public: | ||
| void begin(aPin, bPin) | ||
| { | ||
| _aPin = aPin; | ||
| _bPin = bPin; | ||
| _aState = 0; | ||
| _aPrevState = 0; | ||
| _counter = 0; | ||
| pinMode(aPin, INPUT); | ||
| pinMode(bPin, INPUT); | ||
| // enable PC interrupts on each pin | ||
| noInterrupts(); | ||
| enableInterrupts(aPin); | ||
| enableInterrupts(bPin); | ||
| tick(); | ||
| interrupts(); | ||
| } | ||
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| void tick() | ||
| { | ||
| _aPrevState = _aState; | ||
| _aState = digitalRead(_aPin) == LOW; | ||
| if (_aState != _aPrevState) { | ||
| if (digitalRead(_bPin) == LOW) { | ||
| _counter++; | ||
| } else { | ||
| _counter--; | ||
| } | ||
| } | ||
| } | ||
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| // Compare the current state to where it was last and return the number | ||
| // of turns that have happened since the last check. | ||
| int8_t readChanges() | ||
| { | ||
| int8_t v = _counter; | ||
| _counter = 0; | ||
| return v; | ||
| } | ||
| } | ||
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| // Global instance to assign | ||
| _RotaryEncoder Knob; | ||
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| // Tick when PC interrupt is triggered | ||
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| ISR (PCINT0_vect) { | ||
| Knob.tick(); | ||
| } | ||
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| ISR (PCINT1_vect) { | ||
| Knob.tick(); | ||
| } | ||
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| ISR (PCINT2_vect) { | ||
| Knob.tick(); | ||
| } |
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