Added usb video example

examples/usb-video/common/CameraIpcCommand.h

@@ -0,0 +1,10 @@
+#pragma once
+
+typedef enum
+{
+    CAMERA_IPC_CMD_INIT_FRONT,
+    CAMERA_IPC_CMD_INIT_BACK,
+    CAMERA_IPC_CMD_ACTIVATE,
+    CAMERA_IPC_CMD_DEACTIVATE,
+    CAMERA_IPC_CMD_SWITCH
+} CameraIpcCommand;

examples/usb-video/common/IpcChannels.h

@@ -0,0 +1,4 @@
+#pragma once
+
+#define IPC_CHANNEL_CAMERA  16
+#define IPC_CHANNEL_CAPTURE 17

examples/usb-video/common/IpcService.cpp

@@ -0,0 +1,11 @@
+#include "common.h"
+#include <libtwl/ipc/ipcFifoSystem.h>
+#include "IpcService.h"
+
+void IpcService::Start()
+{
+    ipc_setChannelHandler(_ipcChannel, [] (u32 channel, u32 data, void* arg)
+    {
+        static_cast<IpcService*>(arg)->OnMessageReceived(data);
+    }, this);
+}

examples/usb-video/common/IpcService.h

@@ -0,0 +1,19 @@
+#pragma once
+#include <libtwl/ipc/ipcFifoSystem.h>
+
+class IpcService
+{
+    const u32 _ipcChannel;
+protected:
+    explicit IpcService(u32 ipcChannel)
+        : _ipcChannel(ipcChannel) { }
+
+    void SendResponseMessage(u32 data) const
+    {
+        ipc_sendFifoMessage(_ipcChannel, data);
+    }
+
+public:
+    virtual void Start();
+    virtual void OnMessageReceived(u32 data) = 0;
+};

examples/usb-video/common/ThreadIpcService.cpp

@@ -0,0 +1,33 @@
+#include "common.h"
+#include "ThreadIpcService.h"
+
+void ThreadIpcService::ThreadMain()
+{
+    while (true)
+    {
+        rtos_waitEvent(&_event, false, true);
+        if (_messageValid)
+        {
+            _messageValid = false;
+            HandleMessage(_message);
+        }
+    }
+}
+
+void ThreadIpcService::Start()
+{
+    rtos_createEvent(&_event);
+    rtos_createThread(&_thread, 5, [] (void* arg)
+    {
+        static_cast<ThreadIpcService*>(arg)->ThreadMain();
+    }, this, _stack, _stackSize);
+    rtos_wakeupThread(&_thread);
+    IpcService::Start();
+}
+
+void ThreadIpcService::OnMessageReceived(u32 data)
+{
+    _message = data;
+    _messageValid = true;
+    rtos_signalEvent(&_event);
+}

examples/usb-video/common/ThreadIpcService.h

@@ -0,0 +1,26 @@
+#pragma once
+#include <libtwl/rtos/rtosThread.h>
+#include <libtwl/rtos/rtosEvent.h>
+#include "IpcService.h"
+
+class ThreadIpcService : public IpcService
+{
+    rtos_thread_t _thread;
+    rtos_event_t _event;
+    u32* _stack;
+    u32 _stackSize;
+    u8 _priority;
+    bool _messageValid = false;
+    u32 _message;
+
+    void ThreadMain();
+
+public:
+    ThreadIpcService(u32 ipcChannel, u8 priority, u32* stack, u32 stackSize)
+        : IpcService(ipcChannel), _stack(stack), _stackSize(stackSize), _priority(priority) { }
+
+    void Start() override;
+    void OnMessageReceived(u32 data) override;
+
+    virtual void HandleMessage(u32 data);
+};