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    • Gregory Nutt's avatar
      STM32 - cosmetic changes to indentation · c54adf24
      Gregory Nutt authored
      c54adf24
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      Fix dedbug output; used wrong macro · 2fe0e562
      Gregory Nutt authored
      2fe0e562
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      Update ChangeLogs · 759f8f8e
      Gregory Nutt authored
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      MAX_RAND should be RAND_MAX · 34d1d290
      Gregory Nutt authored
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      Update ChangeLog · 4c74c83c
      Gregory Nutt authored
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      Add support for the new DMA2D features to the STM32F429i-Disco LTDC... · eb28a666
      Gregory Nutt authored
      Add support for the new DMA2D features to the STM32F429i-Disco LTDC configuration.  From Marco Krahl.
      eb28a666
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      Defines a second interface for the dma2d controller. Controlling both LTDC... · 8ed4b1ac
      Gregory Nutt authored
      Defines a second interface for the dma2d controller.  Controlling both LTDC and DMA2D was unpractical from the programmers view because both controllers are to different. LTDC only controls the display visibility but the DMA2D controller changes the content of the frame buffer (buffer of the layer).
      
      The main features are:
      
      1. DMA2D interface
         Supports the nuttx pixel formats:
         - FB_FMT_RGB8
         - FB_FMT_RGB24
         - FB_FMT_RGB16_565
         Dynamic layer allocation during runtime for the supported formats
         - The number of allocatable layer can be configured.
         Supported dma2d operation:
         - blit (Copy content from source to destination layer) also works with
           selectable area.
         - blend (Blend two layer and copy the result to a destination layer wich can
           be a third layer or one of the source layer) also works with selectable
           area.
         - fillarea (Fill a defined area of the whole layer with a specific color)
      
      As a result of that the dma2d controller can't transfer data from the core coupled memory, CCM is disabled but usable by the ccm allocator. Currently the ccm allocator is used for allocating the layer structurei only. For the dma memory (layers frame buffer) memory is allocated from heap 2 and 3.
      
      2. LTDC interface
      
         I have changed the api for the currently non implemented operations:
         - blit (Copy content from a dma2d layer to an ltdc layer) also works with
           selectable area.
         - blend (Blend two dma2d layer and copy the result to a destination ltdc
           layer) also  works with selectable area.
      
           Note! ltdc layer is a layer referenced by the ltdc interface. dma2d layer
           is a layer referenced by the dma2d interface.
      
           One of the most important questions for me was, How can i flexible use an
           ltdc layer with the dma2d interface, e.g. as source layer for dma2d
           operations?
           Get the layer id of the related dma2d layer by a special flag when using
           getlid() function of the ltdc interface and use the layer id to reference
           the specific dma2d layer by the dma2d interface.
      
           The ltdc coupled dma2d layers are predefined and can't be dynamically
           allocated of freed. They use the same frame buffer memory and the same
           color lookup table.
      
         Changes:
         - layer internal format of the clut table
         - interrupt handling for register reload (vertical vblank) instead using
           waiting loop
         - small fixes and refactoring
      
      From Marco Krahl.
      8ed4b1ac
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