Basic working SD card.'

src/core/storage_state.cpp

@@ -0,0 +1,67 @@
+#include "storage_state.h"
+
+
+void StorageState::begin()
+{
+    current.mounted = false;
+    current.timestamp = 0;
+    current.totalMB = 0;
+    current.usedMB = 0;
+    current.freeMB = 0;
+    current.writeSpeedBps = 0;
+    current.cardType[0] = '\0';
+}
+
+
+void StorageState::setMounted(bool mounted)
+{
+    current.mounted = mounted;
+    current.timestamp = millis();
+}
+
+
+void StorageState::setCardType(const char* type)
+{
+    size_t i = 0;
+    for (i = 0; i < sizeof(current.cardType) - 1 && type[i] != '\0'; i++)
+    {
+        current.cardType[i] = type[i];
+    }
+    current.cardType[i] = '\0';
+}
+
+
+void StorageState::setCapacity(uint64_t totalBytes, uint64_t usedBytes)
+{
+    uint64_t freeBytes = (totalBytes > usedBytes) ? (totalBytes - usedBytes) : 0;
+
+    current.totalMB = (uint32_t)(totalBytes >> 20);
+    current.usedMB  = (uint32_t)(usedBytes >> 20);
+    current.freeMB  = (uint32_t)(freeBytes >> 20);
+}
+
+
+void StorageState::setWriteSpeedBps(uint32_t bytesPerSecond)
+{
+    current.writeSpeedBps = bytesPerSecond;
+}
+
+
+StorageSnapshot StorageState::getCurrent()
+{
+    StorageSnapshot snapshot;
+
+    snapshot.mounted = current.mounted;
+    snapshot.timestamp = current.timestamp;
+    snapshot.totalMB = current.totalMB;
+    snapshot.usedMB = current.usedMB;
+    snapshot.freeMB = current.freeMB;
+    snapshot.writeSpeedBps = current.writeSpeedBps;
+
+    for (size_t i = 0; i < sizeof(snapshot.cardType); i++)
+    {
+        snapshot.cardType[i] = current.cardType[i];
+    }
+
+    return snapshot;
+}

src/core/storage_state.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <Arduino.h>
+
+
+// Cross-task snapshot of the SD card, filled by the StorageTask (core 0) and
+// read by the WebService (core 1) for the dashboard broadcast. Values are
+// stored as 32-bit quantities (MB / Bps) so each field reads atomically.
+struct StorageSnapshot
+{
+    bool mounted;
+    uint32_t timestamp;
+    uint32_t totalMB;
+    uint32_t usedMB;
+    uint32_t freeMB;
+    uint32_t writeSpeedBps;
+    char cardType[16];
+};
+
+
+class StorageState
+{
+public:
+    void begin();
+
+    void setMounted(bool mounted);
+    void setCardType(const char* type);
+    void setCapacity(uint64_t totalBytes, uint64_t usedBytes);
+    void setWriteSpeedBps(uint32_t bytesPerSecond);
+
+    StorageSnapshot getCurrent();
+
+private:
+    volatile StorageSnapshot current;
+};

src/main.cpp

@@ -5,6 +5,7 @@
 
 #include "core/dashboard_state.h"
 #include "core/diagnostics_state.h"
+#include "core/storage_state.h"
 
 #include "services/service_manager.h"
 #include "services/wifi_service.h"
@@ -20,13 +21,14 @@
 
 DashboardState dashboardState;
 DiagnosticsState diagnosticsState;
+StorageState storageState;
 
 // Simple service scheduler nice for grouping tasks
 ServiceManager services;
 
 WiFiService wifi;
 OTAService ota;
-WebService web(dashboardState, diagnosticsState);
+WebService web(dashboardState, diagnosticsState, storageState);
 
 
 // Actual FreeRTOS tasks that are scheduled
@@ -35,7 +37,7 @@ SystemTask systemTask(services);
 DiagnosticsTask diagnosticsTask(diagnosticsState);
 
 SDManager sdManager;
-StorageTask storageTask(sdManager);
+StorageTask storageTask(sdManager, storageState);
 
 void setup()
 {

src/services/web_service.cpp

@@ -1,10 +1,11 @@
 #include "web_service.h"
 
-WebService::WebService(DashboardState& state, DiagnosticsState& diag_state)
+WebService::WebService(DashboardState& state, DiagnosticsState& diag_state, StorageState& storage_state)
     :
     Service("Web", 10),
     dashboardState(state),
     diagnosticsState(diag_state),
+    storageState(storage_state),
     server(80),
     webSocket(81)
 {
@@ -64,6 +65,11 @@ h1 {
   font-size: 28px;
   margin-top: 20px;
 }
+
+#sd_status {
+  font-size: 24px;
+  font-weight: bold;
+}
 </style>
 
 <script>
@@ -82,11 +88,13 @@ function connectWebSocket() {
     socket.onmessage = function(event) {
         const data = JSON.parse(event.data);
 
-        document.getElementById("uptime").innerHTML = data.system.uptime;
-        document.getElementById("firmware_version").innerHTML = data.system.version;
-        document.getElementById("free_heap").innerHTML = data.diagnostics.free_heap;
-        document.getElementById("minimum_free_heap").innerHTML = data.diagnostics.minimum_free_heap;
-        document.getElementById("cpu_frequency").innerHTML = data.diagnostics.cpu_frequency;
+        document.getElementById("uptime").innerHTML = "Uptime: " + data.system.uptime;
+        document.getElementById("firmware_version").innerHTML = "Firmware Version: " + data.system.version;
+        document.getElementById("free_heap").innerHTML = "Free Heap: " + data.diagnostics.free_heap;
+        document.getElementById("minimum_free_heap").innerHTML = "Minimum Free Heap: " + data.diagnostics.minimum_free_heap;
+        document.getElementById("cpu_frequency").innerHTML = "CPU Frequency: " + data.diagnostics.cpu_frequency + "MHz";
+
+        updateStorage(data.storage);
     };
 
     socket.onclose = function() {
@@ -95,6 +103,37 @@ function connectWebSocket() {
     };
 }
 
+function formatBytesMB(mb) {
+    const value = Number(mb);
+    if (value >= 1024) {
+        return (value / 1024).toFixed(2) + " GB";
+    }
+    return value.toFixed(0) + " MB";
+}
+
+function updateStorage(storage) {
+    const sdStatus = document.getElementById("sd_status");
+
+    if (storage && storage.mounted === "true") {
+        sdStatus.innerHTML = "SD card found";
+        sdStatus.style.color = "#00ff99";
+
+        document.getElementById("sd_type").innerHTML = "Card Type: " + storage.card_type;
+        document.getElementById("sd_free").innerHTML = "Space left: " + 
+            formatBytesMB(storage.free_mb) + " free of " + formatBytesMB(storage.total_mb) +
+            " (" + Math.round(storage.used_mb / storage.total_mb * 100) + "% used)";
+        document.getElementById("sd_speed").innerHTML = "Estimated write speed: " + 
+            (storage.write_speed_bps / 1048576).toFixed(2) + " MB/s";
+    } else {
+        sdStatus.innerHTML = "SD not found";
+        sdStatus.style.color = "red";
+
+        document.getElementById("sd_type").innerHTML = "-";
+        document.getElementById("sd_free").innerHTML = "-";
+        document.getElementById("sd_speed").innerHTML = "-";
+    }
+}
+
 window.onload = connectWebSocket;
 
 </script>
@@ -104,23 +143,27 @@ window.onload = connectWebSocket;
 <body>
 <div class="card">
 <h1>ESP32 Dashboard OTA</h1>
-<p>Device uptime:</p>
-<div id="uptime">Loading...</div>
+<div id="uptime">Device uptime: Loading...</div>
 </div>
 
 <div class="card">
 <h1>Hub Diagnostics:</h1>
-<p>Free heap:</p>
-<div id=free_heap>Loading...</div>
-<p>Minimum free heap:</p>
-<div id=minimum_free_heap>Loading...</div>
-<p>CPU Frequency:</p>
-<div id=cpu_frequency>Loading...</div>
+<div id=free_heap>Free heap: Loading...</div>
+<div id=minimum_free_heap>Minimum free heap: Loading...</div>
+<div id=cpu_frequency>CPU Frequency: Loading...</div>
+</div>
+
+<div class="card">
+<h1>SD Storage:</h1>
+<div id=sd_status>Status: Loading...</div>
+<div id=sd_type>Card type: Loading...</div>
+<div id=sd_free>Space left: Loading...</div>
+<div id=sd_speed>Estimated write speed: Loading...</div>
 </div>
 
 </body>
 <footer>
-Firmware Version: <div id="firmware_version">Loading...</div>
+<div id="firmware_version">Firmware Version: Loading...</div>
 </footer>
 </html>
 )rawliteral";
@@ -128,6 +171,7 @@ Firmware Version: <div id="firmware_version">Loading...</div>
 void WebService::broadcastState()
 {
     DiagnosticSample diagnostics = diagnosticsState.getCurrent();
+    StorageSnapshot storage = storageState.getCurrent();
     String json = "{";
 
     // Opening system tag:
@@ -161,6 +205,35 @@ void WebService::broadcastState()
 
     json += "}"; // Clost diagnostic tag
 
+    // Opening storage tag:
+    json += ",\"storage\":{";
+
+    json += "\"mounted\":\"";
+    json += storage.mounted ? "true" : "false";
+    json += "\",";
+
+    json += "\"card_type\":\"";
+    json += storage.cardType;
+    json += "\",";
+
+    json += "\"total_mb\":\"";
+    json += storage.totalMB;
+    json += "\",";
+
+    json += "\"free_mb\":\"";
+    json += storage.freeMB;
+    json += "\",";
+
+    json += "\"used_mb\":\"";
+    json += storage.usedMB;
+    json += "\",";
+
+    json += "\"write_speed_bps\":\"";
+    json += storage.writeSpeedBps;
+    json += "\"";
+
+    json += "}"; // Close storage tag
+
 
     // Final close bracket
     json += "}";

src/services/web_service.h

@@ -7,12 +7,13 @@
 
 #include "../core/dashboard_state.h"
 #include "../core/diagnostics_state.h"
+#include "../core/storage_state.h"
 
 class WebService : public Service {
 
 public:
 
-    WebService(DashboardState& state, DiagnosticsState& diag_state);
+    WebService(DashboardState& state, DiagnosticsState& diag_state, StorageState& storage_state);
 
     void begin() override;
     void update() override;
@@ -24,6 +25,7 @@ private:
 
     DashboardState& dashboardState;
     DiagnosticsState& diagnosticsState;
+    StorageState& storageState;
 
     void handleWebSocketMessage(uint8_t clientNum, uint8_t *payload, size_t length);
     void broadcastState();

src/storage/sd_manager.cpp

@@ -228,6 +228,115 @@ fs::FS& SDManager::fs()
 }
 
 
+StorageCardType SDManager::cardType() const
+{
+    if (mounted && backend != nullptr)
+    {
+        return backend->cardType();
+    }
+    return StorageCardType::None;
+}
+
+
+const char* SDManager::cardTypeName() const
+{
+    return cardTypeName(cardType());
+}
+
+
+uint64_t SDManager::totalBytes() const
+{
+    if (mounted && backend != nullptr)
+    {
+        return backend->totalBytes();
+    }
+    return 0;
+}
+
+
+uint64_t SDManager::usedBytes() const
+{
+    if (mounted && backend != nullptr)
+    {
+        return backend->usedBytes();
+    }
+    return 0;
+}
+
+
+uint64_t SDManager::freeBytes() const
+{
+    uint64_t total = totalBytes();
+    uint64_t used  = usedBytes();
+    return (total > used) ? (total - used) : 0;
+}
+
+
+uint32_t SDManager::measureWriteSpeed()
+{
+    if (!mounted || backend == nullptr)
+    {
+        return 0;
+    }
+
+    fs::FS& files = backend->fs();
+
+    const char* scratchPath = STORAGE_SPEED_MEASURE_PATH;
+    const size_t bufferSize = 16 * 1024;
+
+    // Remove any leftover from a previous crashed run.
+    files.remove(scratchPath);
+
+    uint8_t* buffer = (uint8_t*)malloc(bufferSize);
+    if (buffer == nullptr)
+    {
+        return 0;
+    }
+
+    memset(buffer, 0xA5, bufferSize);
+
+    File file = files.open(scratchPath, FILE_WRITE);
+    if (!file)
+    {
+        free(buffer);
+        return 0;
+    }
+
+    uint32_t remaining = STORAGE_SPEED_MEASURE_BYTES;
+    uint32_t startUs = micros();
+
+    while (remaining > 0)
+    {
+        size_t toWrite = (remaining < bufferSize) ? remaining : bufferSize;
+        size_t written = file.write(buffer, toWrite);
+
+        if (written == 0)
+        {
+            break;
+        }
+
+        remaining -= written;
+    }
+
+    file.close();
+
+    uint32_t elapsedUs = micros() - startUs;
+    Serial.print("Elapsed microseconds: ");
+    Serial.println(elapsedUs);
+
+    files.remove(scratchPath);
+    free(buffer);
+
+    if (remaining != 0 || elapsedUs == 0)
+    {
+        return 0;
+    }
+
+    uint64_t writtenBytes = (uint64_t)STORAGE_SPEED_MEASURE_BYTES - remaining;
+    return (uint32_t)((writtenBytes * 1000000ULL) / elapsedUs);
+}
+
+
 const char* SDManager::cardTypeName(StorageCardType type)
 {
     switch (type)

src/storage/sd_manager.h

@@ -49,6 +49,17 @@ public:
 
     fs::FS& fs();
 
+    StorageCardType cardType() const;
+    const char* cardTypeName() const;
+    uint64_t totalBytes() const;
+    uint64_t usedBytes() const;
+    uint64_t freeBytes() const;
+
+    // Writes a scratch file of STORAGE_SPEED_MEASURE_BYTES and returns the
+    // achieved write throughput in bytes/second (0 on failure). The scratch
+    // file is deleted before returning.
+    uint32_t measureWriteSpeed();
+
     void printCardInfo();
     void listFiles();
 

src/storage/storage_config.h

@@ -97,3 +97,18 @@
 // Maximum directory depth printed during the recursive boot listing. Guards
 // the StorageTask stack against pathological directory nesting.
 #define STORAGE_LIST_MAX_DEPTH   10
+
+// --- Write-speed estimation -------------------------------------------------
+
+// Path of the temporary scratch file used to measure write throughput. It is
+// created, written, measured, then deleted, so it never appears in listings.
+#define STORAGE_SPEED_MEASURE_PATH   STORAGE_MOUNT_POINT "/.writespeed.tmp"
+
+// Size of the scratch file written per measurement (bytes).
+#define STORAGE_SPEED_MEASURE_BYTES       (0.5 * 1024 * 1024)
+
+// How often to re-measure write speed (ms). This is a bring-up ESTIMATE only:
+// it writes STORAGE_SPEED_MEASURE_BYTES to the card on every tick. Once real
+// logging exists, throughput should be derived from actual logging writes and
+// this benchmark disabled by setting the interval to 0 (measure once at boot).
+#define STORAGE_SPEED_MEASURE_INTERVAL_MS 0

src/tasks/storage_task.cpp

@@ -1,9 +1,12 @@
 #include "storage_task.h"
 
+#include "../storage/storage_config.h"
 
-StorageTask::StorageTask(SDManager& manager)
+
+StorageTask::StorageTask(SDManager& manager, StorageState& state)
 :
 storage(manager),
+storageState(state),
 taskHandle(nullptr)
 {
 }
@@ -40,6 +43,11 @@ void StorageTask::run()
 {
     Serial.println("[Storage] Initializing SD card...");
 
+    storageState.begin();
+
+    // While the mount has not succeeded the dashboard must show "SD not found".
+    storageState.setMounted(false);
+
     // Retry the mount until it succeeds. This keeps the card dead-pin-capable:
     // reseating the card, fixing a wire, or powering the module will bring it
     // up without rebooting the Hub. (The SD init handshake runs at 400 kHz, so
@@ -53,17 +61,35 @@ void StorageTask::run()
         vTaskDelay(pdMS_TO_TICKS(5000));
     }
 
+    storageState.setMounted(true);
+    storageState.setCardType(storage.cardTypeName());
+
     storage.printCardInfo();
     storage.listFiles();
 
+    // Initial write-speed estimate for the dashboard.
+    storageState.setWriteSpeedBps(storage.measureWriteSpeed());
+    storageState.setCapacity(storage.totalBytes(), storage.usedBytes());
+
     TickType_t lastWake =
         xTaskGetTickCount();
 
+    uint32_t lastSpeedMeasure = millis();
+
     while (true)
     {
+        // Periodically re-estimate write speed and refresh capacity so the
+        // dashboard stays current. An interval of 0 disables re-measuring.
+        if (STORAGE_SPEED_MEASURE_INTERVAL_MS != 0 &&
+            millis() - lastSpeedMeasure >= STORAGE_SPEED_MEASURE_INTERVAL_MS)
+        {
+            lastSpeedMeasure = millis();
+            storageState.setWriteSpeedBps(storage.measureWriteSpeed());
+            storageState.setCapacity(storage.totalBytes(), storage.usedBytes());
+        }
+
         // Future integration point: a producer/consumer queue will feed
-        // audio data here to be flushed to the card. For now the task
-        // simply idles while the system runs.
+        // audio data here to be flushed to the card.
         vTaskDelayUntil(
             &lastWake,
             pdMS_TO_TICKS(1000)

src/tasks/storage_task.h

@@ -2,13 +2,14 @@
 
 #include <Arduino.h>
 
+#include "../core/storage_state.h"
 #include "../storage/sd_manager.h"
 
 
 class StorageTask
 {
 public:
-    StorageTask(SDManager& manager);
+    StorageTask(SDManager& manager, StorageState& state);
 
     void start();
 
@@ -17,6 +18,7 @@ private:
     void run();
 
     SDManager& storage;
+    StorageState& storageState;
 
     TaskHandle_t taskHandle = nullptr;
 };