M5Paper: Judge touch gestures.

main.cpp

#include <M5EPD.h>

int lastFingers;
int eventIndex;
u_long events[4];

void pushTouchEvent(bool down) {
  if (!down && (eventIndex <= 0)) {
    return;
  }
  if (down && (eventIndex >= 4)) {
    eventIndex = 0;
  }
  events[eventIndex++] = ::millis();
}

void judgeMode() {
  if (eventIndex <= 0) {
    return;
  }
  const u_long now = ::millis();
  const u_long last = events[eventIndex - 1];
  if ((now - last) < 150) {
    return;
  }
  const char* name[] = {
    "SWIPE", "TAP", "DRUG", "DOUBLETAP",
  };
  Serial.printf("gesture: %s\r\n", name[eventIndex - 1]);
  eventIndex = 0;
}

void setup() {
  M5.begin();
  eventIndex = 0;
  lastFingers = 0;
}

void loop() {
  if (!M5.TP.avaliable()) {
    judgeMode();
    return;
  }

  M5.TP.update();
  if (!M5.TP.isFingerUp()) {
    if (lastFingers != M5.TP.getFingerNum()) {
      if (lastFingers == 0) {
        pushTouchEvent(true);
      }
      lastFingers = M5.TP.getFingerNum();
      Serial.printf("Fingers: %d\r\n", lastFingers);
    } else {
      judgeMode();
    }
  } else {
    if (lastFingers != 0) {
      pushTouchEvent(false);
      lastFingers = 0;
      Serial.printf("Fingers: %d\r\n", lastFingers);
    }
  }
}