InitLCD

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InitLCD

Description:

This is a USBm.dll function that initializes LCD variables. This includes the selection of the lines used for RW, RS, E and the port used for data. RW, RS, and E are reset. These commands are appropriate for HD44780 devices and devices that are compatible.

Command Syntax: (USBm.dll)

USBm_InitLCD(device, sel, port)

The USBm_InitLCD function syntax has these parts:

Part	Description
device	A zero-based index to address the appropriate USB device.
sel	Selection of the RW line in the higher nibble, and the RS line in the lower nibble.
port	Selection of the LCD data port in the higher nibble, and the E line in the lower nibble. A value of 0-h is port A, a value of 1-h is port B.

Remarks:

Bit⁄Line Selection

Byte Value	Result	Byte Value	Result
00h	Affect A.0	08h	Affect B.0
01h	Affect A.1	09h	Affect B.1
02h	Affect A.2	0Ah	Affect B.2
03h	Affect A.3	0Bh	Affect B.3
04h	Affect A.4	0Ch	Affect B.4
05h	Affect A.5	0Dh	Affect B.5
06h	Affect A.6	0Eh	Affect B.6
07h	Affect A.7	0Fh	Affect B.7

VB Declaration

Public Declare Function USBm_InitLCD _
    Lib "USBm.dll" _
        (ByVal device As Byte, _
        ByVal sel As Byte, _
        ByVal port As Byte) _
    As Integer

VB Example

USBm_InitLCD 2, &H89, &H0A

This code fragment will select port A for the data lines to the LCD, B.0 for the RW line, B.1 for the RS line, and B.2 for the E line.

C Example

-TBD-

Hardware: U401 USB Interface U421 USB Interface

Programming: USBm DLL Programming Download Files

Application Notes: U4x1 Application Notes Misc Applications and Information FAQ