InitGLCD

Syntax:

    InitGLCD

Command Availability:

Available on all microcontrollers with a Graphical LCD configured.

Explanation:

InitGLCD initializes the Graphical LCD for operation: it sets the required control pins to their correct direction, resets the display controller, selects both controller chips, and clears the screen so the display starts from a known state. Call it once, before any other GLCD command.

Example:

    'Set pin directions
    Dir GLCD_RS Out
    Dir GLCD_RW Out
    Dir GLCD_ENABLE Out
    Dir GLCD_CS1 Out
    Dir GLCD_CS2 Out
    Dir GLCD_RESET Out

    'Reset
    Set GLCD_RESET Off
    Wait 1 ms
    Set GLCD_RESET On
    Wait 1 ms

    'Select both chips
    Set GLCD_CS1 On
    Set GLCD_CS2 On

    'Set on
    Set GLCD_RS Off
    GLCDWriteByte 63          ' <<< turns the controller display on

    'Set Z to 0
    GLCDWriteByte 192

    'Deselect chips
    Set GLCD_CS1 Off
    Set GLCD_CS2 Off

    'Clear screen
    GLCDCLS

Key line: GLCDWriteByte 63 — sends the controller’s "display on" command directly, since this is the manual, pin-level setup sequence InitGLCD performs internally; a user program simply calls InitGLCD once instead of reproducing these steps.

See Also:

  • GLCD Overview — the GLCD command family this initialisation supports
  • GLCDCLS — clearing the screen, the last step InitGLCD performs
  • GLCDWriteByte — the low-level command used internally to reach the controller
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