LUA: add ability to read rotenc speed (#7918)

Add getRotEncSpeed()

radio/src/lua/api_general.cpp

@@ -375,6 +375,26 @@ bool luaFindFieldByName(const char * name, LuaField & field, unsigned int flags)
   return false;  // not found
 }
 
+/*luadoc
+@function getRotEncSpeed()
+
+Return rotary encoder current speed
+
+@retval number in list: ROTENC_LOWSPEED, ROTENC_MIDSPEED, ROTENC_HIGHSPEED
+        return 0 on radio without rotary encoder
+
+@status current Introduced in 2.3.10
+*/
+static int luGetRotEncSpeed(lua_State * L)
+{
+#if defined(ROTARY_ENCODER_NAVIGATION)
+  lua_pushunsigned(L, rotencSpeed);
+#else
+  lua_pushunsigned(L, 0);
+#endif
+  return 1;
+}
+
 /*luadoc
 @function sportTelemetryPop()
 
@@ -1680,6 +1700,7 @@ const luaL_Reg opentxLib[] = {
   { "getVersion", luaGetVersion },
   { "getGeneralSettings", luaGetGeneralSettings },
   { "getGlobalTimer", luaGetGlobalTimer },
+  { "getRotEncSpeed", luGetRotEncSpeed },
   { "getValue", luaGetValue },
   { "getRAS", luaGetRAS },
   { "getTxGPS", luaGetTxGPS },
@@ -1814,6 +1835,9 @@ const luaR_value_entry opentxConstants[] = {
   { "EVT_VIRTUAL_NEXT", EVT_ROTARY_RIGHT },
   { "EVT_VIRTUAL_DEC", EVT_ROTARY_LEFT },
   { "EVT_VIRTUAL_INC", EVT_ROTARY_RIGHT },
+  { "ROTENC_LOWSPEED", ROTENC_LOWSPEED },
+  { "ROTENC_MIDSPEED", ROTENC_MIDSPEED },
+  { "ROTENC_HIGHSPEED", ROTENC_HIGHSPEED },
 #elif defined(PCBX9D) || defined(PCBX9DP)  // key reverted between field nav and value change
   { "EVT_VIRTUAL_PREV", EVT_KEY_FIRST(KEY_PLUS) },
   { "EVT_VIRTUAL_PREV_REPT", EVT_KEY_REPT(KEY_PLUS) },