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Simplified display configuration initialisation. |
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Simplified viewport initialisation somewhat. |
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Moved sprite operations to the image module. |
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Introduced a sprite abstraction, bundling an image with stored display regions. |
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Replaced the individual stored region abstraction with a collection abstraction, |
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Introduced an image abstraction, making image data easier to work with. |
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Introduced an abstraction for stored screen region details. |
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Introduced a viewport abstraction to simplify the example program. |
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Introduced screen start address retention for each frame in the display library. |
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Merged changes involving absent files. |
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Added missing files. |
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Extended the documentation, adding build, circuit and programming details. |
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Renamed the display functions to indicate their origin. |
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Moved font structure initialisation into a function. |
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Wrap the text properly when filling the screen with characters. |
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Moved various common functions to a utilities module. |
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Added tag snapshot-20181108 for changeset e83be2917e9a |
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Fixed pixel positioning for single-channel timed transfers, introducing the line |
snapshot-20181108 |
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Added diagrams from VGAPIC32 plus new diagrams illustrating new solutions. |
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Switch to double-buffering. Only vga-cpu and vga-timer are actually usable. |
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Fixed screen edge updates where update columns span the background image edge. |
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Introduced multiple frame usage in the example. |
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Added support for source image scaling where images might be used in single- and |
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Introduced various pointer address wrapping functions. |
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Fixed erroneous frame size definitions. |
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Introduced a separate function to set up the background image. |
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Merged concurrent changes. |
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Introduced a function to wait for the end of the visible region. |
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Check the requested number of frames. |
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Introduced separate functions to simplify the animate function. |
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Introduced initial support for multiple display frames. |
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Maintain separate addresses for updating the display, permitting access to |
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Made font plotting relative to the screen start, not the framebuffer address. |
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Moved resources into the data directory, adding a 160x128 screen image. |
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Added general documentation and updated the vga-dual example documentation to |
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Consolidated the CPU- and DMA-based display functionality. |
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Introduced support for, and a demonstration of, CPU-driven pixel data transfers. |
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Removed unnecessary include. |
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Fixed erroneous timer interrupt flags register! |
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Introduced tracking of the vertical origin so that the background is repainted |
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Added scrolling support, making display operations relative to the start address |
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Added an extra line to the framebuffer for horizontal scrolling purposes. |
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Tidied up some repetition in expressions. |
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Moved common VGA timings to a separate file, adjusting the visible start. |
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Employ a more sensible LED blinking frequency in the exception handler. |
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Added a bitmap font, a conversion tool, and library code to blit characters. |
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Included VGA definitions to support ordering-independent inclusion of this file. |
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Defined code to follow the main function in case it wants to return somewhere. |
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Fixed invocation of the interrupt handler function, avoiding $gp usage. The |
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Improved the blitting code to permit saving and restoring framebuffer data and |
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Added options to strip/avoid padding the output image, and to use byte-aligned |
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Incorporated the parallel mode configuration into the vga example code. |
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Moved framebuffer initialisation to after the point of interrupts being enabled. |
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Save and restore the accumulator registers. Otherwise, certain operations, such |
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Added example image data and a function to copy the data to the framebuffer. |
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Merged sections to avoid virtual and physical (load) address discrepancies. |
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Use array types to reference program regions more naturally. |
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Introduced .bss section clearing. |
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Removed stray whitespace. |
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Fixed the relocation function, enabling the vga example again. |
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