Send a command to the LCD
Description:
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:
| Part | Description |
| device | A zero-based index to address the appropriate USB device. |
| data | The value to transfer to the LCD command register. |
Remarks:
VB Declaration
| Public Declare Function USBm_LCDCmd _ Lib “USBm.dll” _ (ByVal device As Byte, _ ByVal data As Byte) _ As Integer |
VB Example
| USBm_LCDCmd 2, &H33 |
This code fragment will write the command byte of &H33 to the LCD command register connected to device 2.
C Prototype
| int USBm_LCDCmd( unsigned char device, unsigned char data ); |
C Example
RobotBASIC
usbm_LCDCmd(ne_DeviceNumber,ne_CommandByte)
Returns true if successfull, false otherwise. Sends a command code to the LCD.
Raw Command Format:
| Byte Number | Description |
| 0 | 11h: LCDCmdCmd |
| 1 | Byte Data |
| 2 | <not used> |
| 3 | <not used> |
| 4 | <not used> |
| 5 | <not used> |
| 6 | <not used> |
| 7 | <not used> |
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:
| Byte Number | Description |
| 0 | 11h: LCDCmdCmd |
| 1 | <not used> |
| 2 | <not used> |
| 3 | <not used> |
| 4 | <not used> |
| 5 | <not used> |
| 6 | <not used> |
| 7 | <not used> |
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.