C++ refactoring (#91)

TactilityHeadless/Source/hal/sdcard/Sdcard.cpp

@@ -0,0 +1,85 @@
+#include "Sdcard.h"
+
+#include "Mutex.h"
+#include "TactilityCore.h"
+
+namespace tt::hal::sdcard {
+
+#define TAG "sdcard"
+
+static Mutex mutex(MutexTypeRecursive);
+
+typedef struct {
+    const SdCard* sdcard;
+    void* context;
+} MountData;
+
+static MountData data = {
+    .sdcard = nullptr,
+    .context = nullptr
+};
+
+static bool lock(uint32_t timeout_ticks) {
+    return mutex.acquire(timeout_ticks) == TtStatusOk;
+}
+
+static void unlock() {
+    mutex.release();
+}
+
+bool mount(const SdCard* sdcard) {
+    TT_LOG_I(TAG, "Mounting");
+
+    if (data.sdcard != nullptr) {
+        TT_LOG_E(TAG, "Failed to mount: already mounted");
+        return false;
+    }
+
+    if (lock(100)) {
+        void* context = sdcard->mount(TT_SDCARD_MOUNT_POINT);
+        data = (MountData) {
+            .sdcard = sdcard,
+            .context = context
+        };
+        unlock();
+        return (data.context != nullptr);
+    } else {
+        TT_LOG_E(TAG, "Failed to lock");
+        return false;
+    }
+}
+
+State getState() {
+    if (data.context == nullptr) {
+        return StateUnmounted;
+    } else if (data.sdcard->is_mounted(data.context)) {
+        return StateMounted;
+    } else {
+        return StateError;
+    }
+}
+
+bool unmount(uint32_t timeout_ticks) {
+    TT_LOG_I(TAG, "Unmounting");
+    bool result = false;
+
+    if (lock(timeout_ticks)) {
+        if (data.sdcard != nullptr) {
+            data.sdcard->unmount(data.context);
+            data = (MountData) {
+                .sdcard = nullptr,
+                .context = nullptr
+            };
+            result = true;
+        } else {
+            TT_LOG_E(TAG, "Can't unmount: nothing mounted");
+        }
+        unlock();
+    } else {
+        TT_LOG_E(TAG, "Failed to lock in %lu ticks", timeout_ticks);
+    }
+
+    return result;
+}
+
+} // namespace

TactilityHeadless/Source/hal/sdcard/Sdcard.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include "TactilityCore.h"
+
+namespace tt::hal::sdcard {
+
+#define TT_SDCARD_MOUNT_POINT "/sdcard"
+
+typedef void* (*Mount)(const char* mount_path);
+typedef void (*Unmount)(void* context);
+typedef bool (*IsMounted)(void* context);
+
+typedef enum {
+    StateMounted,
+    StateUnmounted,
+    StateError,
+} State;
+
+typedef enum {
+    MountBehaviourAtBoot, /** Only mount at boot */
+    MountBehaviourAnytime /** Mount/dismount any time */
+} MountBehaviour;
+
+typedef struct {
+    Mount mount;
+    Unmount unmount;
+    IsMounted is_mounted;
+    MountBehaviour mount_behaviour;
+} SdCard;
+
+bool mount(const SdCard* sdcard);
+State getState();
+bool unmount(uint32_t timeout_ticks);
+
+} // namespace