Add physical mirek limits to DaliDt8State and implement color temperature limit methods in DaliDT8

src/dt8.cpp

@@ -5,6 +5,28 @@
 #include <algorithm>
 #include <cmath>
 
+namespace {
+int colourTempLimitQuerySelector(int limitType) {
+  switch (limitType & 0xFF) {
+    case 0:
+      return 128;
+    case 1:
+      return 130;
+    case 2:
+      return 129;
+    case 3:
+      return 131;
+    default:
+      return (limitType & 0x01) == 0 ? 128 : 130;
+  }
+}
+
+std::optional<int> kelvinFromMirek(std::optional<int> mirek) {
+  if (!mirek.has_value() || mirek.value() == 0) return std::nullopt;
+  return static_cast<int>(std::floor(1000000.0 / static_cast<double>(mirek.value())));
+}
+}  // namespace
+
 DaliDT8::DaliDT8(DaliBase& base) : base_(base) {}
 
 bool DaliDT8::enableDT8() { return base_.dtSelect(8); }
@@ -104,6 +126,14 @@ std::optional<int> DaliDT8::getPhysicalMaxColorTemperature(int a) {
   return static_cast<int>(std::floor(1000000.0 / static_cast<double>(mirek.value())));
 }
 
+std::optional<int> DaliDT8::getColourTempLimitRaw(int address, int limitType) {
+  return getColourRaw(address, colourTempLimitQuerySelector(limitType));
+}
+
+std::optional<int> DaliDT8::getColourTempLimit(int address, int limitType) {
+  return kelvinFromMirek(getColourTempLimitRaw(address, limitType));
+}
+
 bool DaliDT8::setColourRaw(int addr, int x1, int y1) {
   const int x1L = x1 & 0xFF;
   const int y1L = y1 & 0xFF;