Add Simpson board support

variants/simpson/SimpsonKeypad.cpp

@@ -0,0 +1,70 @@
+#include "SimpsonKeypad.h"
+
+#include <Wire.h>
+
+namespace {
+char control_keymap[19] = {
+  SIMPSON_KEY_CANCEL, SIMPSON_KEY_UP, 0, SIMPSON_KEY_BLUETOOTH,
+  SIMPSON_KEY_LEFT, SIMPSON_KEY_ENTER, SIMPSON_KEY_RIGHT, SIMPSON_KEY_BRIGHTNESS_UP,
+  SIMPSON_KEY_SYMBOLS, SIMPSON_KEY_DOWN, 0, SIMPSON_KEY_BRIGHTNESS_DOWN,
+  SIMPSON_KEY_MESSAGES, 0, SIMPSON_KEY_FN, SIMPSON_KEY_GPS, 0, 0, 0
+};
+
+char alphabet_keymap[19] = {
+  ',', 'A', 'D', SIMPSON_KEY_BLUETOOTH,
+  'G', 'J', 'M', SIMPSON_KEY_BRIGHTNESS_UP,
+  'P', 'T', 'W', SIMPSON_KEY_BRIGHTNESS_DOWN,
+  SIMPSON_KEY_BACKSPACE, ' ', SIMPSON_KEY_FN, SIMPSON_KEY_GPS, 0, 0, 0
+};
+
+char numeric_keymap[19] = {
+  '1', '2', '3', SIMPSON_KEY_BLUETOOTH,
+  '4', '5', '6', SIMPSON_KEY_BRIGHTNESS_UP,
+  '7', '8', '9', SIMPSON_KEY_BRIGHTNESS_DOWN,
+  SIMPSON_KEY_BACKSPACE, '0', SIMPSON_KEY_FN, SIMPSON_KEY_GPS, 0, 0, 0
+};
+}
+
+bool SimpsonKeypad::begin() {
+  if (!_keypad.begin()) return false;
+  _keypad.setKeyPadMode(I2C_KEYPAD_4x4);
+  _keypad.setDebounceThreshold(50);
+  loadModeMap();
+  _ready = true;
+  return true;
+}
+
+void SimpsonKeypad::loadModeMap() {
+  switch (_mode) {
+    case SIMPSON_KEYPAD_CONTROL:
+      _keypad.loadKeyMap(control_keymap);
+      break;
+    case SIMPSON_KEYPAD_ABC:
+    case SIMPSON_KEYPAD_ABC_UPPER:
+      _keypad.loadKeyMap(alphabet_keymap);
+      break;
+    case SIMPSON_KEYPAD_NUMERIC:
+      _keypad.loadKeyMap(numeric_keymap);
+      break;
+  }
+}
+
+uint8_t SimpsonKeypad::poll() {
+  if (!_ready) return SIMPSON_KEY_NONE;
+
+  uint8_t key = _keypad.getChar();
+  if (key == I2C_KEYPAD_THRESHOLD) return SIMPSON_KEY_NONE;
+  if (key == SIMPSON_KEY_NONE) {
+    _last_key = SIMPSON_KEY_NONE;
+    return SIMPSON_KEY_NONE;
+  }
+  if (key == _last_key) return SIMPSON_KEY_NONE;
+  _last_key = key;
+
+  if (key == SIMPSON_KEY_FN) {
+    _mode = static_cast<SimpsonKeypadMode>((_mode + 1) % 4);
+    loadModeMap();
+    return SIMPSON_KEY_MODE_CHANGED;
+  }
+  return key;
+}