Allow image and LUT to be located either in ram or flash

eink.hpp

@@ -157,9 +157,11 @@ class Eink {
 		}
 
 		constexpr auto sendImageChannel = [](const auto command, const auto &image) {
+			using image_t = std::remove_cvref_t<decltype(image)>;
+
 			sendCommand(command);
-			for (auto j = std::size_t{0}; j < image.size(); ++j) {
-				const auto [count, data] = flash::load(image[j]);
+			for (auto j = std::size_t{0}; j < std::tuple_size_v<image_t>; ++j) {
+				const auto [count, data] = flash::loadLike<RleImage>(image[j]);
 				for (auto i = std::uint16_t{0}; i < count; ++i) {
 					if (command == Cmd::WRITE_RAM_BLACK) {
 						sendData(data);
@@ -170,8 +172,8 @@ class Eink {
 			}
 		};
 
-		sendImageChannel(Cmd::WRITE_RAM_BLACK, std::get<0>(rleImage));
-		sendImageChannel(Cmd::WRITE_RAM_RED, std::get<1>(rleImage));
+		sendImageChannel(Cmd::WRITE_RAM_BLACK, std::get<0>(rleImage.value));
+		sendImageChannel(Cmd::WRITE_RAM_RED, std::get<1>(rleImage.value));
 
 		sendCommand(Cmd::DISPLAY_UPDATE_CONTROL_2);
 		sendData(USE_ORIGINAL_LUT ? 0xF7 : 0xC7);
@@ -210,13 +212,15 @@ class Eink {
 		waitUntilIdle();
 	}
 
-	static void writeLut(const Waveform &lut)
+	template <typename Lut>
+	static void writeLut(const Lut &lut)
 	{
-		const auto flashLutPtr = reinterpret_cast<const std::byte *>(&lut);
+		static_assert(sizeof(lut) == sizeof(Waveform), "Invalid LUT size");
 
 		sendCommand(Cmd::WRITE_LUT);
 		for (auto i = std::size_t{0}; i < sizeof(lut); ++i) {
-			const auto lutByte = flash::load(flashLutPtr[i]);
+			const auto lutByte = lut[i];
+			static_assert(std::is_same_v<std::byte, std::remove_cvref_t<decltype(lutByte)>>, "Invalid LUT value type");
 			sendData(static_cast<word_t>(lutByte));
 		}
 	}