Microchip Technology AC164127-7 User Manuals

Table of Contents

• Introduction

  1
• Basics of Color Science

  1
  • FIGURE 1: Red + Green = Yellow

    1
  • FIGURE 2: Colors in 16-bit Representation

    2
  • FIGURE 3: GrayScale Values of 0 to 225

    2
  • FIGURE 4: Color Look-up Table (CLUT)

    2
• Basic Display Terminology

  3
  • FIGURE 5: A 3.5'' QVGA Display in Landscape Mode

    3
• Graphics Subsystem Hardware

  4
• Components of a Graphics System

  4
  • FIGURE 6: The Four Basic Components of a Graphics System

    4
  • Display Glass

    4
    • TABLE 1: Comparison of Different Display Technologies(1)

      4
  • Display Controller

    5
  • Frame Buffer

    5
    • EQUATION 1:

      5
    • EXAMPLE 1:

      5
    • EXAMPLE 2:

      5
    • EXAMPLE 3:

      5
  • Microcontroller

    6
    • FIGURE 7: Pixel Data Update

      6
• Integration of Basic Components

  7
  • FIGURE 8: Different Ways of Integrating Basic Graphics’ Components

    7
  • TABLE 2: Basic Components

    8
• Power Sequencing in Display Panels

  9
  • FIGURE 9: Power Sequence of a Panel

    9
• Touch Screen

  10
• 4-Wire Resistive Touch Screen

  10
  • FIGURE 10: 4-Wire Resistive Touch Screen

    10
  • FIGURE 11: Measurement of the X-Voltage

    11
  • FIGURE 12: Measurement of the Y-Voltage

    11
• Decision Factors

  11
  • Display Resolution and Size

    11
    • FIGURE 13: Display of ‘A’ at Various Resolutions

      11
  • Display Orientation

    12
  • Color Depth Selection

    12
    • FIGURE 14: Landscape and Portrait Displays used in Landscape Mode

      12
    • TABLE 3: RAM Size Requirement for Different Color Depths

      12
  • Frame Buffer Size

    13
    • EQUATION 2:

      13
  • Processing Power (MIPS)

    13
  • Configuration of Graphics Components

    13
  • Frame Rate vs. MIPS

    13
  • Interfacing with an Unmatched Number of Display RGB Lines

    14
    • FIGURE 15: Display Controller’s Display Signals less than LCD’s Display Signals

      14
    • FIGURE 16: Display Controller’s Display Signals are more than LCD’s Display Signals (Possible Color Degradation)

      15
• The PIC24FJ256DA210 Microcontroller

  16
  • FIGURE 17: PIC24FJ256DA210 graphics controller module

    16
  • TABLE 4: Microcontroller Pins

    17
• Development Tools

  19
  • FIGURE 18: Graphics PICtail™ Plus Daughter Board with 3.2'' Display Kit (AC164127-3)

    19
  • FIGURE 19: Development Board supplied with PIC24FJ256DA210 Development Kit (DV164039)

    19
  • FIGURE 20: 4.3'' WQVGA Powertip TFT Display Board (AC164127-6)

    20
  • FIGURE 21: Graphics Display Prototype Boards (AC164139)

    20
• Software

  21
  • FIGURE 22: Structure of Microchip Graphics Library

    21
• Display Device Driver Layer

  22
• Graphic Primitive Layer

  22
• Graphic Object Layer (GOL)

  22
  • EQUATION 3:

    23
• User Message Interface

  24
• Application Layer

  24
  • EXAMPLE 4:

    24
  • EXAMPLE 5:

    25
  • EXAMPLE 6:

    25
• Configuration

  26
  • GraphicsConfig.h

    26
  • HardwareProfile.h

    27
• Other Graphics Libraries for PIC Microcontroller

  27
• Conclusion

  27
• Appendix A: Color Look-up Table (CLUT)

  28
  • A Recap of Basic Concepts

    28
  • 8-Bit Gray Level Image

    28
  • Image Data Type for Color Images

    28
  • 8-Bit Color Image Files

    28
    • FIGURE A-1: Color Look-Up Table (CLUT)

      28
    • TABLE A-1: Contents of an example Image using Indexes Instead of RGB Values

      29
    • TABLE A-2: Palette TablE (24 BPP)

      29
  • Median Cut Algorithm

    29
• Appendix B: Double-Buffering

  30
  • FIGURE B-1: Initial Stage

    30
  • FIGURE B-2: Drawing Stage

    30
  • FIGURE B-3: Swap Stage

    30
  • FIGURE B-4: Final Stage

    30
  • When to Use Double-Buffering?

    30
  • When Not to Use Double-Buffering?

    30
  • How to Use Double-Buffering?

    30
• Appendix C: Advanced Usage of RCCGPU

  31
  • FIGURE C-1: Move from Left to right

    31
  • FIGURE C-2: Expanding Rectangle

    31
  • FIGURE C-3: Expanding line

    31
• Appendix D: Abbreviations

  32
  • TABLE D-1: Abbreviations

    32
• References

  32
• Worldwide Sales and Service

  34