|Online Development Notebook > Index > Programming Overview > Device Commands > LCDCmd|
LCDCmd - Send a command to the LCD
This is a function that writes a command to the LCD. The RS, RW, E lines and the data port are selected by the InitLCDCmd. The data byte is written to the selected port and the control lines are set appropriately. The E line is toggled for five to eight microseconds.
Command Syntax: (USBm.dll)
USBm_LCDCmd( device, data )
The USBm_LCDCmd function syntax has these parts:
|device||A zero-based index to address the appropriate USB device.|
|data||The value to transfer to the LCD command register.|
|Public Declare Function USBm_LCDCmd _|
Lib "USBm.dll" _
(ByVal device As Byte, _
ByVal data As Byte) _
|USBm_LCDCmd 2, &H33|
This code fragment will write the command byte of &H33 to the LCD command register connected to device 2.
|int USBm_LCDCmd( unsigned char device, unsigned char data );|
Returns true if successfull, false otherwise. Sends a command code to the LCD.
Raw Command Format:
Raw Command Format Details:
Byte 0 contains the command. Byte 1 is the data to transfer to the LCD command register. Byte 2 through byte 7 are unused.
Raw Command Response Format:
Raw Command Response Format Details:
Byte 0 contains the command. Byte 1 through byte 7 are unused.
Raw Command Example Usage:
11-33-00-00-00-00-00-00 will write the command byte of 33h to the LCD command register.
Hardware: U401 USB Interface U421 USB Interface U451 USB Interface
Programming: USBm DLL Programming Download Files
Application Notes: U4x1 Application Notes Misc Applications and Information FAQ
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