Hi all,

I have managed to get a small App to talk to a LCD Display and show "Hello World!" with no program and recently the LCD manufacturer
has sent over a list of commands that the screen supports.

I am hoping to send to the screen the Clear command (this is HEX 0C) how would I sent this to the screen?

I am using

to send the string to the display.

So my question is how do I send the Hex command to the screen?

AndyGable said

I am hoping to send to the screen the Clear command (this is HEX 0C) how would I sent this to the screen?

So my question is how do I send the Hex command to the screen?

Since the hex value "0C" is and occupies one byte, you must specify it:

 Would that work for the following Commands


Select output mode = 1B 3D n (n= 0x30, 0x31, 0x32)
Select display mode = 1F n (n= 0x01, 0x02, 0x03)
Initialize the display = 1B 40
Move Cursor Up 1F 0A
Move to the Right most = 1F 0D
Bottom most position = 1F 42
Move to given location = 1F 24 X Y (1<= X, 1<= y <2)
Turn cursor on or off = 1F 43 n (n= 0,1)

Thanks for the advice so far on this project

AndyGable said

Would that work for the following Commands
……
Thanks for the advice so far on this project

Sorry, I didn't understand if you solved it.

vuott said

AndyGable said

Would that work for the following Commands
……
Thanks for the advice so far on this project

Sorry, I didn't understand if you solved it.

Sorry Vuott
 I have the Clear command working but you said this was only a byte so do I send the command "1F 0D"  (for example as it has more to it)

does it still work with the Write #SerialPort1, &h0C As Byte Code?

AndyGable said

but you said this was only a byte so do I send the command "1F 0D"

…obviously the problem is whether you have to send one byte at a time, or whether those two bytes represent a 16-bit value (in Gambas it is a "Short" data type).
In the first case you will have to repeat the "Write … As Byte " function twice (explicitly or with a loop), or you could use an array of type Byte[], as in the following example:

maybe like so …

PJBlack said

maybe like so …

Code (gambas)

1. ......
2.     Dim strOutput As String = Chr(&H1B) & Chr(&H3D) & OutputMode
3.     Dim strDisplay As String = Chr(&H1F) & DisplayMode
4.     Dim strInit As String = Chr(&H1B) & Chr(&H40)
5.  
6.    ........
7.  
8.     Write #sptCom1, strOutput & strDisplay & strInit
9.  

Yes, perfect, if he prefers to use ASCII characters (as the character representation of a numeric value).
Theoretically, the substance does not change: they are always values that each occupy 8 bits (1 byte) of memory (in C is "char " datatype).

vuott said

Theoretically, the substance does not change: they are always values that each occupy 8 bits (1 byte) of memory.

yes …

Write #stream, bValue as byte
Write #stream, bValue as byte
Write #stream, bValue as byte
Write #stream, bValue as byte
Write #stream, bValue as byte
Write #stream, bValue as byte

is the same like

sString = bValue & bValue & bValue & bValue & bValue & bValue  

write #stream, sString

but second one is much clearer (to me) and you con put it in a sub like

public sub outputserial (value as string)
  write #stream,value
end

and wherre you need you can

outputserial(bValue & bValue & bValue & bValue & bValue & bValue)
outputserial(bdifferentValue)