From 987ea3555d48e9135f4a7e4789a1b74ba2ee664b Mon Sep 17 00:00:00 2001
From: Jared Boone <jboone@earfeast.com>
Date: Tue, 10 Nov 2015 15:24:42 -0800
Subject: [PATCH] SD card detection and filesystem mounting.

---
 firmware/application/event.hpp   |  1 -
 firmware/application/main.cpp    | 32 ++++++++++++++++------
 firmware/application/sd_card.hpp | 47 ++++++++++++++++++++++++++++++++
 firmware/common/message.hpp      | 13 +++++++++
 4 files changed, 84 insertions(+), 9 deletions(-)
 create mode 100644 firmware/application/sd_card.hpp

diff --git a/firmware/application/event.hpp b/firmware/application/event.hpp
index e9b77c937..fbf40d0a4 100644
--- a/firmware/application/event.hpp
+++ b/firmware/application/event.hpp
@@ -26,7 +26,6 @@
 
 constexpr auto EVT_MASK_RTC_TICK		= EVENT_MASK(0);
 constexpr auto EVT_MASK_LCD_FRAME_SYNC	= EVENT_MASK(1);
-constexpr auto EVT_MASK_SD_CARD_PRESENT = EVENT_MASK(2);
 constexpr auto EVT_MASK_SWITCHES		= EVENT_MASK(3);
 constexpr auto EVT_MASK_ENCODER			= EVENT_MASK(4);
 constexpr auto EVT_MASK_TOUCH			= EVENT_MASK(5);
diff --git a/firmware/application/main.cpp b/firmware/application/main.cpp
index 3b10085e2..66060469f 100755
--- a/firmware/application/main.cpp
+++ b/firmware/application/main.cpp
@@ -52,6 +52,8 @@
 #include "lpc43xx_cpp.hpp"
 using namespace lpc43xx;
 
+#include "sd_card.hpp"
+
 #include <string.h>
 
 class EventDispatcher {
@@ -87,6 +89,7 @@ private:
 	ui::Context& context;
 	uint32_t encoder_last = 0;
 	bool is_running = true;
+	bool sd_card_present = false;
 
 	eventmask_t wait() {
 		return chEvtWaitAny(ALL_EVENTS);
@@ -105,10 +108,6 @@ private:
 			handle_lcd_frame_sync();
 		}
 
-		if( events & EVT_MASK_SD_CARD_PRESENT ) {
-			handle_sd_card_detect();
-		}
-
 		if( events & EVT_MASK_SWITCHES ) {
 			handle_switches();
 		}
@@ -130,7 +129,28 @@ private:
 	}
 
 	void handle_rtc_tick() {
+		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;
 
+			if( sd_card_present ) {
+				if( sdcConnect(&SDCD1) == CH_SUCCESS ) {
+					if( sd_card::filesystem::mount() == FR_OK ) {
+						SDCardStatusMessage message { true };
+						context.message_map().send(&message);
+					} else {
+						// TODO: Error, modal warning?
+					}
+				} else {
+					// TODO: Error, modal warning?
+				}
+			} else {
+				sdcDisconnect(&SDCD1);
+
+				SDCardStatusMessage message { false };
+				context.message_map().send(&message);
+			}
+		}
 	}
 
 	static ui::Widget* touch_widget(ui::Widget* const w, ui::TouchEvent event) {
@@ -181,10 +201,6 @@ private:
 		painter.paint_widget_tree(top_widget);
 	}
 
-	void handle_sd_card_detect() {
-
-	}
-
 	void handle_switches() {
 		const auto switches_state = get_switches_state();
 		for(size_t i=0; i<switches_state.size(); i++) {
diff --git a/firmware/application/sd_card.hpp b/firmware/application/sd_card.hpp
new file mode 100644
index 000000000..d7827b90e
--- /dev/null
+++ b/firmware/application/sd_card.hpp
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+#ifndef __SD_CARD_H__
+#define __SD_CARD_H__
+
+#include "ff.h"
+
+namespace sd_card {
+namespace filesystem {
+
+namespace {
+
+FATFS fs;
+
+}
+
+FRESULT mount() {
+	return f_mount(&fs, "", 0);
+}
+
+FRESULT unmount() {
+	return f_mount(NULL, "", 0);
+}
+
+} /* namespace filesystem */
+} /* namespace sd_card */
+
+#endif/*__SD_CARD_H__*/
diff --git a/firmware/common/message.hpp b/firmware/common/message.hpp
index ff592ae23..6b7ec9833 100644
--- a/firmware/common/message.hpp
+++ b/firmware/common/message.hpp
@@ -46,6 +46,7 @@ public:
 		TPMSPacket = 6,
 		Shutdown = 8,
 		AISPacket = 7,
+		SDCardStatus = 10,
 		MAX
 	};
 
@@ -245,6 +246,18 @@ public:
 	}
 };
 
+class SDCardStatusMessage : public Message {
+public:
+	constexpr SDCardStatusMessage(
+		bool is_mounted
+	) : Message { ID::SDCardStatus },
+		is_mounted { is_mounted }
+	{
+	}
+
+	const bool is_mounted;
+};
+
 class MessageHandlerMap {
 public:
 	using MessageHandler = std::function<void(Message* const p)>;