Remove SDCardStatusMessage, replace with Signal, extract to separate files.

firmware/application/Makefile

@@ -168,6 +168,7 @@ CPPSRC = main.cpp \
          receiver_model.cpp \
          spectrum_color_lut.cpp \
          ais_baseband.cpp \
+         sd_card.cpp \
          ../common/utility.cpp \
          ../common/chibios_cpp.cpp \
          ../common/debug.cpp \

firmware/application/main.cpp

@@ -128,33 +128,8 @@ private:
 		}
 	}
 
-	void update_sd_card_status() {
-		const auto sd_card_present_now = sdc_lld_is_card_inserted(&SDCD1);
-		if( sd_card_present_now != sd_card_present ) {
-			sd_card_present = sd_card_present_now;
-
-			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.state = SDCardStatusMessage::State::Mounted;
-					} else {
-						message.state = SDCardStatusMessage::State::MountError;
-					}
-				} else {
-					message.state = SDCardStatusMessage::State::ConnectError;
-				}
-			} else {
-				sdcDisconnect(&SDCD1);
-			}
-
-			context.message_map().send(&message);
-		}
-	}
-
 	void handle_rtc_tick() {
-		update_sd_card_status();
+		sd_card::poll_inserted();
 	}
 
 	static ui::Widget* touch_widget(ui::Widget* const w, ui::TouchEvent event) {

firmware/application/sd_card.cpp

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "sd_card.hpp"
+
+#include <hal.h>
+
+#include "ff.h"
+
+namespace sd_card {
+
+namespace {
+
+bool card_present = false;
+
+FATFS fs;
+
+FRESULT mount() {
+	return f_mount(&fs, "", 0);
+}
+
+FRESULT unmount() {
+	return f_mount(NULL, "", 0);
+}
+
+} /* namespace */
+
+Signal<Status> status_signal;
+
+void poll_inserted() {
+	const auto card_present_now = sdc_lld_is_card_inserted(&SDCD1);
+	if( card_present_now != card_present ) {
+		card_present = card_present_now;
+
+		Status status { card_present ? Status::Present : Status::NotPresent };
+
+		if( card_present ) {
+			if( sdcConnect(&SDCD1) == CH_SUCCESS ) {
+				if( mount() == FR_OK ) {
+					status = Status::Mounted;
+				} else {
+					status = Status::MountError;
+				}
+			} else {
+				status = Status::ConnectError;
+			}
+		} else {
+			sdcDisconnect(&SDCD1);
+		}
+
+		status_signal.emit(status);
+	}
+}
+
+} /* namespace sd_card */

firmware/application/sd_card.hpp

@@ -22,26 +22,25 @@
 #ifndef __SD_CARD_H__
 #define __SD_CARD_H__
 
-#include "ff.h"
+#include <cstdint>
+
+#include "signal.hpp"
 
 namespace sd_card {
-namespace filesystem {
 
-namespace {
+enum class Status : int32_t {
+	IOError = -3,
+	MountError = -2,
+	ConnectError = -1,
+	NotPresent = 0,
+	Present = 1,
+	Mounted = 2,
+};
 
-FATFS fs;
+extern Signal<Status> status_signal;
 
-}
+void poll_inserted();
 
-FRESULT mount() {
-	return f_mount(&fs, "", 0);
-}
-
-FRESULT unmount() {
-	return f_mount(NULL, "", 0);
-}
-
-} /* namespace filesystem */
 } /* namespace sd_card */
 
 #endif/*__SD_CARD_H__*/

firmware/application/ui_receiver.cpp

@@ -29,6 +29,7 @@ using namespace portapack;
 
 #include "ais_baseband.hpp"
 
+#include "sd_card.hpp"
 #include "ff.h"
 
 namespace ui {
@@ -511,17 +512,16 @@ void ReceiverView::on_show() {
 			this->on_packet_tpms(*message);
 		}
 	);
-	message_map.register_handler(Message::ID::SDCardStatus,
-		[this](Message* const p) {
-			const auto message = static_cast<const SDCardStatusMessage*>(p);
-			this->on_sd_card_status(*message);
-		}
-	);
+
+	sd_card_status_signal_token = sd_card::status_signal += [this](const sd_card::Status status) {
+		this->on_sd_card_status(status);
+	};
 }
 
 void ReceiverView::on_hide() {
+	sd_card::status_signal -= sd_card_status_signal_token;
+
 	auto& message_map = context().message_map();
-	message_map.unregister_handler(Message::ID::SDCardStatus);
 	message_map.unregister_handler(Message::ID::TPMSPacket);
 	message_map.unregister_handler(Message::ID::AISPacket);
 }
@@ -585,18 +585,23 @@ void ReceiverView::on_packet_tpms(const TPMSPacketMessage& message) {
 	}
 }
 
-void ReceiverView::on_sd_card_status(const SDCardStatusMessage& message) {
-	if( message.state == SDCardStatusMessage::State::Mounted ) {
+void ReceiverView::on_sd_card_status(const sd_card::Status status) {
+	if( status == sd_card::Status::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);
 			const auto seek_result = f_lseek(&fil_tpms, fil_size);
 			if( seek_result != FR_OK ) {
 				f_close(&fil_tpms);
+				// TODO: Error, indicate somehow.
+			} else {
+				// TODO: Indicate success.
 			}
 		} else {
 			// TODO: Error, indicate somehow.
 		}
+	} else {
+		// TODO: Indicate unmounted.
 	}
 }
 

firmware/application/ui_receiver.hpp

@@ -475,7 +475,9 @@ private:
 
 	void on_packet_ais(const AISPacketMessage& message);
 	void on_packet_tpms(const TPMSPacketMessage& message);
-	void on_sd_card_status(const SDCardStatusMessage& message);
+	void on_sd_card_status(const sd_card::Status status);
+
+	SignalToken sd_card_status_signal_token;
 };
 
 } /* namespace ui */

firmware/common/message.hpp

@@ -46,7 +46,6 @@ public:
 		TPMSPacket = 6,
 		Shutdown = 8,
 		AISPacket = 7,
-		SDCardStatus = 10,
 		MAX
 	};
 
@@ -241,27 +240,6 @@ 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(
-		State state
-	) : Message { ID::SDCardStatus },
-		state { state }
-	{
-	}
-
-	State state;
-};
-
 class MessageHandlerMap {
 public:
 	using MessageHandler = std::function<void(Message* const p)>;