Basic SD working

src/tasks/storage_task.cpp

@@ -0,0 +1,72 @@
+#include "storage_task.h"
+
+
+StorageTask::StorageTask(SDManager& manager)
+:
+storage(manager),
+taskHandle(nullptr)
+{
+}
+
+
+void StorageTask::start()
+{
+    // Dedicated task on core 0 so SD card work never blocks the services
+    // running on core 1 (SystemTask / DiagnosticsTask). The 8 KB stack is
+    // sized for the recursive boot-time file listing; the eventual
+    // producer/consumer logging loop will also live here.
+    xTaskCreatePinnedToCore(
+        taskEntry,
+        "StorageTask",
+        8192,
+        this,
+        3,
+        &taskHandle,
+        0
+    );
+}
+
+
+void StorageTask::taskEntry(void* parameter)
+{
+    StorageTask* task =
+        static_cast<StorageTask*>(parameter);
+
+    task->run();
+}
+
+
+void StorageTask::run()
+{
+    Serial.println("[Storage] Initializing SD card...");
+
+    // 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
+    // a failure here is wiring/power/seating/pull-up related, not speed.)
+    while (!storage.begin())
+    {
+        Serial.println("[Storage] SD card mount FAILED.");
+        Serial.println("[Storage] Check: 3.3V power + common ground, CS/SCK/MOSI/MISO wiring,");
+        Serial.println("[Storage]       card fully seated (click), and module pull-ups.");
+        Serial.println("[Storage] Retrying in 5 s...");
+        vTaskDelay(pdMS_TO_TICKS(5000));
+    }
+
+    storage.printCardInfo();
+    storage.listFiles();
+
+    TickType_t lastWake =
+        xTaskGetTickCount();
+
+    while (true)
+    {
+        // 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.
+        vTaskDelayUntil(
+            &lastWake,
+            pdMS_TO_TICKS(1000)
+        );
+    }
+}