Broaden SD card status detail in message.

firmware/application/main.cpp

@@ -133,13 +133,17 @@ private:
 		if( sd_card_present_now != sd_card_present ) {
 			sd_card_present = sd_card_present_now;
 
-			SDCardStatusMessage message { false };
+			SDCardStatusMessage message { sd_card_present ? SDCardStatusMessage::State::Present : SDCardStatusMessage::State::NotPresent };
 
 			if( sd_card_present ) {
 				if( sdcConnect(&SDCD1) == CH_SUCCESS ) {
 					if( sd_card::filesystem::mount() == FR_OK ) {
-						message.is_mounted = true;
+						message.state = SDCardStatusMessage::State::Mounted;
+					} else {
+						message.state = SDCardStatusMessage::State::MountError;
 					}
+				} else {
+					message.state = SDCardStatusMessage::State::ConnectError;
 				}
 			} else {
 				sdcDisconnect(&SDCD1);

firmware/application/ui_receiver.cpp

@@ -514,7 +514,7 @@ void ReceiverView::on_show() {
 	message_map.register_handler(Message::ID::SDCardStatus,
 		[this](Message* const p) {
 			const auto message = static_cast<const SDCardStatusMessage*>(p);
-			this->on_sd_card_mounted(message->is_mounted);
+			this->on_sd_card_status(*message);
 		}
 	);
 }
@@ -585,8 +585,8 @@ void ReceiverView::on_packet_tpms(const TPMSPacketMessage& message) {
 	}
 }
 
-void ReceiverView::on_sd_card_mounted(const bool is_mounted) {
-	if( is_mounted ) {
+void ReceiverView::on_sd_card_status(const SDCardStatusMessage& message) {
+	if( message.state == SDCardStatusMessage::State::Mounted ) {
 		const auto open_result = f_open(&fil_tpms, "tpms.txt", FA_WRITE | FA_OPEN_ALWAYS);
 		if( open_result == FR_OK ) {
 			const auto fil_size = f_size(&fil_tpms);

firmware/application/ui_receiver.hpp

@@ -475,7 +475,7 @@ private:
 
 	void on_packet_ais(const AISPacketMessage& message);
 	void on_packet_tpms(const TPMSPacketMessage& message);
-	void on_sd_card_mounted(const bool is_mounted);
+	void on_sd_card_status(const SDCardStatusMessage& message);
 };
 
 } /* namespace ui */

firmware/common/message.hpp

@@ -243,14 +243,23 @@ public:
 
 class SDCardStatusMessage : public Message {
 public:
+	enum class State : int32_t {
+		IOError = -3,
+		MountError = -2,
+		ConnectError = -1,
+		NotPresent = 0,
+		Present = 1,
+		Mounted = 2,
+	};
+
 	constexpr SDCardStatusMessage(
-		bool is_mounted
+		State state
 	) : Message { ID::SDCardStatus },
-		is_mounted { is_mounted }
+		state { state }
 	{
 	}
 
-	bool is_mounted;
+	State state;
 };
 
 class MessageHandlerMap {