Thread: Help with LCD code

The commands depend on the LCD. Basically what you are going to want to do is set up the command register first and then load the data register. For example if PortA was at 0x392 then you could do this

Code:

mov dx, 392H
mov ax, 91H
out dx, ax

This is assuming that 91H sets all the command register for say 2x20 line lcd screen, set's the curser to blink and set it at the beginning of the first line.

Then say your data register was at 393H. You could send data out the same way. So put that in an _ASM directive and use an unsigned char to hold the ascii text [You said 8-bit interface] to transfer the data.

Other than that could you give the model number of the lcd?

Well you could start by saying which "microcontroller" and which "lcd" module you have.
We're not psychics you know!

Welcome to the forum Dara,

Do you have a compiler for this particular microcontroller?

There is no standard C++ way to write to an I/O port. The C++ compiler for that chip will have its own custom I/0 library. In the unlikely event that you have a compiler for the "system", then cout will write characters to the display. But even then, you'll probably want to more control than just writing characters on the display.

You'll have to consult the LCD's data sheet to learn how to talk to it.

The hardware & software tasks are similar. You have to learn how each part works, then figure-out how to make them work together. Of course, this sometimes involves adding some additional custom hardware, or writing a custom software library.