90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
#define CHANNELS 4
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#define SAMPLE_CACHE_LENGTH 16 // Must be power of 2 (8, 16, etc.); See cache.h for implementation
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#define HIT_THRES 750 // The thresholds are also dependent on SAMPLE_CACHE_LENGTH, if you
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#define RESET_THRES 100 // changed SAMPLE_CACHE_LENGTH, you must also adjust thresholds
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#define SAMPLING_PERIOD 500 // Sampling period in microseconds, 500us = 0.5ms = 2000Hz
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#define DEBUG 0
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#include "USB.h"
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#include "USBHIDKeyboard.h"
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#include "cache.h"
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USBHIDKeyboard Keyboard;
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Cache<int, SAMPLE_CACHE_LENGTH> inputWindow[CHANNELS];
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unsigned long power[CHANNELS];
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unsigned long lastPower[CHANNELS];
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bool triggered;
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unsigned long triggeredTime[CHANNELS];
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const byte inPins[] = {36, 39, 34, 35}; // L don, L kat, R don, R kat
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const byte outPins[] = {25, 26, 27, 14}; // LED visualization (optional)
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const char outKeys[] = {'f', 'd', 'j', 'k'}; // L don, L kat, R don, R kat
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float sensitivity[] = {1.0, 1.0, 1.0, 1.0};
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short maxIndex;
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float maxPower;
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unsigned long lastTime;
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void setup() {
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Serial.begin(250000);
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for (byte i = 0; i < CHANNELS; i++) {
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power[i] = 0;
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lastPower[i] = 0;
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triggered = false;
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pinMode(inPins[i], INPUT);
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pinMode(outPins[i], OUTPUT);
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}
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maxIndex = -1;
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maxPower = 0;
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lastTime = micros();
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Keyboard.begin();
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USB.begin();
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}
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void loop() {
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if (maxIndex != -1 && lastPower[maxIndex] < RESET_THRES) {
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triggered = false;
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digitalWrite(outPins[maxIndex], LOW);
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maxIndex = -1;
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maxPower = 0;
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}
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for (byte i = 0; i < CHANNELS; i++) {
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inputWindow[i].put(analogRead(inPins[i]));
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power[i] = sensitivity[i] *
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(power[i] - inputWindow[i].get(1) + inputWindow[i].get());
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if (lastPower[i] > maxPower && power[i] < lastPower[i]) {
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maxPower = lastPower[i];
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maxIndex = i;
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}
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lastPower[i] = power[i];
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#if DEBUG
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Serial.print(power[i]);
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Serial.print(" ");
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#endif
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}
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if (!triggered && maxPower >= HIT_THRES) {
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triggered = true;
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digitalWrite(outPins[maxIndex], HIGH);
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#if !DEBUG
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Keyboard.write(outKeys[maxIndex]);
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#endif
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}
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#if DEBUG
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Serial.print("\n");
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#endif
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unsigned int frameTime = micros() - lastTime;
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if (frameTime < SAMPLING_PERIOD) {
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delayMicroseconds(SAMPLING_PERIOD - frameTime);
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}
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lastTime = micros();
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}
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