Unit TFT Framebuffer

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Description

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Ultibo TFT Framebuffer driver library unit

This is a generic framebuffer device support unit for SPI based TFT screens using common chipsets.

This unit implements the shared functionality that is common to all devices and provides a set of functions that device specific drivers must implement. For each supported device a driver unit is required that implements the SPI communications to initialize the device, setup resolution and color depth as well as refreshing the framebuffer data to the device memory on change.

The resulting device created by the combination of this unit and a device specific driver is registered with Ultibo as a framebuffer device that can be accessed using all of the standard framebuffer API functions.

For examples of drivers that use this support unit see the HX8357D and ILI9340 units.

Constants

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TFTFramebuffer specific constants TFT_FRAMEBUFFER_*

TFT_FRAMEBUFFER_FRAME_RATE_DEFAULT = 20;

Default frame rate of 20 frames per second refresh

Type definitions

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To be documented

Public variables

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None defined

Function declarations

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TFT framebuffer functions

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function TFTFramebufferAllocate(Framebuffer:PFramebufferDevice; Properties:PFramebufferProperties):LongWord;

Description: Implementation of FramebufferDeviceAllocate API for TFT Framebuffer

Note	Not intended to be called directly by applications, use FramebufferDeviceAllocate instead

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function TFTFramebufferRelease(Framebuffer:PFramebufferDevice):LongWord;

Description: Implementation of FramebufferDeviceRelease API for TFT Framebuffer

Note	Not intended to be called directly by applications, use FramebufferDeviceRelease instead

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function TFTFramebufferMark(Framebuffer:PFramebufferDevice; X,Y,Width,Height,Flags:LongWord):LongWord;

Description: Implementation of FramebufferDeviceMark API for TFT Framebuffer

Note	Not intended to be called directly by applications, use FramebufferDeviceMark instead. Marks full lines only, X and Width are ignored for TFT Framebuffer.

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function TFTFramebufferCommit(Framebuffer:PFramebufferDevice; Address,Size,Flags:LongWord):LongWord;

Description: Implementation of FramebufferDeviceCommit API for TFT Framebuffer

Note	Not intended to be called directly by applications, use FramebufferDeviceCommit instead

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function TFTFramebufferSetProperties(Framebuffer:PFramebufferDevice; Properties:PFramebufferProperties):LongWord;

Description: Implementation of FramebufferDeviceSetProperties API for TFT Framebuffer

Note	Not intended to be called directly by applications, use FramebufferDeviceSetProperties instead

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procedure TFTFramebufferUpdateDisplay(Framebuffer:PTFTFramebuffer);

Description: Timer function for display dirty region redraw

Note	Not intended to be called directly by applications

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