Initial upload of the Physical Flick keyboard files.

mozc-furikku/arduino/flick/flick_keyboard.cpp

@@ -0,0 +1,67 @@
+#include "flick_keyboard.h"
+#include <stdint.h>
+
+#define ADC_BITS 12
+
+void FlickKeyboard::ProcessSensorData(const SensorData& data, size_t maxKeyNum,
+    const char** outputStrings, int* nOutputs) {
+  const char* characters[COLS][ROWS] = {
+    {"a", "i", "u", "e", "o"},
+    {"ka", "ki", "ku", "ke", "ko"},
+    {"sa", "si", "su", "se", "so"},
+    {"ta", "ti", "tu", "te", "to"},
+    {"na", "ni", "nu", "ne", "no"},
+    {"ha", "hi", "hu", "he", "ho"},
+    {"ma", "mi", "mu", "me", "mo"},
+    {"ya", "(", "yu", ")", "yo"},
+    {"ra", "ri", "ru", "re", "ro"},
+    {"\n", "\b", "", " ", ""},
+    {"wa", "wo", "nn", "-", "~"},
+    {",", ".", "?", "!", "..."}
+  };
+  *nOutputs = 0;
+  for (size_t i = 0; i < COLS; i++) {
+    Direction s = ConvertToFlickState(data.axes[i * 2 + 1],
+        data.axes[i * 2], data.button[i]);
+    if (lastState[i] == NONE && s != NONE) {
+      if (*nOutputs < maxKeyNum) {
+        outputStrings[(*nOutputs)++] = characters[i][s];
+      }
+    }
+    lastState[i] = s;
+  }
+}
+
+FlickKeyboard::FlickKeyboard() {
+  for (size_t i = 0; i < COLS; i++) {
+    lastState[i] = NONE;
+  }
+}
+
+Direction FlickKeyboard::ConvertToFlickState(
+    int16_t x, int16_t y, bool buttonPressed) {
+  const int16_t adScale = 1 << ADC_BITS;
+  const int16_t adCenter = adScale / 2;
+  const int16_t threshold = adScale * 0.4;
+
+  int16_t diffX = x - adCenter;
+  int16_t diffY = y - adCenter;
+  if (buttonPressed) {
+    return CENTER;
+  }
+  if (abs(diffX) > abs(diffY)) {
+    if (diffX < -threshold) {
+      return LEFT;
+    } else if (diffX > threshold) {
+      return RIGHT;
+    }
+  } else {
+    if (diffY < -threshold) {
+      return UP;
+    } else if (diffY > threshold) {
+      return DOWN;
+    }
+  }
+  return NONE;
+}
+