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Video Functions

Functions

• void VIDEO_Init (u32 VideoMode)

  Initialize the Video Interface.
  
  

• void VIDEO_SetFrameBuffer (u32 Which, u32 FrameBufferAddr)

  Set framebuffer address.
  
  

• void VIDEO_WaitVSync (void)

  Wait for vertical retrace.
  
  

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Function Documentation

void VIDEO_Init (  u32  VideoMode  )

Initialize the Video Interface. Parameters: VideoMode  The video mode you want to initialize. This can be one of these defines: VIDEO_640X480_NTSC_YUV16 VIDEO_640X480_PAL50_YUV16 VIDEO_640X480_PAL60_YUV16 Where it is in the following format: VIDEO_[Width]X[Height]_[VideoStandard]_[ColorFormat] Explanation of different video standards: PAL Phase Alternating Line, is a video standard used in many countries around the world. Countries such as the United Kingdom, The Netherlands, Germany and more use PAL as their video standard. There are different types of PAL standards, one of which uses a vertical frequency of 60Hz and one of which uses a vertical frequency of 50Hz. NTSC National Television System Commitee, is another video standard used in many countries around the world. While it's not technically superior, it's more widely used in countries such as the USA, Japan and many more. If a TV is PAL only, it will display NTSC pictures in black and white, due to the lack of colour signal. The fundamentals of video standards: +----------------+------------+----------------+---------------------+ | Video Standard | Frames/sec | Frequency (Hz) | Colour signal (MHz) | +----------------+------------+----------------+---------------------+ | NTSC | 30 | 60 | 3.58 | | PAL 50 | 25 | 50 | 4.43 | | PAL 60 | 30 | 60 | 4.43 | +----------------+------------+----------------+---------------------+ Video-standard informations found at: http://www.horrordvds.com/extras/articles/palntsc http://www.techtronics.com/uk/shop/87-00-video-standards-ntsc-pal.html

void VIDEO_SetFrameBuffer (  u32  Which, u32  FrameBufferAddr )

Set framebuffer address. Parameters: Which  Which framebuffer you want to set the address for For the Which paramater, you can specify one of these defines: VIDEO_FRAMEBUFFER_1 VIDEO_FRAMEBUFFER_2 VIDEO_FRAMEBUFFER_BOTH Parameters: FrameBufferAddr  The memory address of the framebuffer Any detailed information on this? Email me if you know more! :)

void VIDEO_WaitVSync (  void   )

Wait for vertical retrace. What is Vertical retrace (VSync)? When the beam arrives the lower right corner, it goes to the upper left corner. This moment is called vertical retrace.

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