Re: 16x2 LCD display

On Nov 26, 6:19 am, John_H <newsgr...@xxxxxxxxxxxxxxxx> wrote:
sachin wrote:

Hi John,

thanks for your valuable reply.
I just wana to know that is there any reference verilog code is
available to control LCD display directly from verilog and not using
the in-built controller. i am not sure about what they have been
supporting for this LCD display.
If I will go to use their in-built controller for my data text display
then what and where exactly I have to do need changes?
I think you got my point... Please let me know as soon as possible as
my work is avail around. I guess it would be easy to change as per my
req. in the defined code by xilinx.

Rgds,
Sachin

There is no Verilog-only reference that I'm aware of. I was going to
roll my own - "how hard could it be?" The trouble is it's pretty
involved. It's doable, but involved. Because of this, the early Xilinx
use of the PicoBlaze controller is a very nice implementation. If
you've never done assembly language, it may be a stretch for you but
it's really quite simple to modify and compile. I translated the VHDL
PicoBlaze core to Verilog (pretty simple) then found out someone at
Xilinx had done the same thing.

Complex control is best done with a processor. The PicoBlaze is a teeny
tiny processor with an assembler that's easy to use. The code that came
with the Spartan-3E development board already did the initialization and
had several useful elements that I reused in my own code. I added a
binary-to-decimal converter and had pretty much everything I could want.
It took me a few hours to have the display doing everything I wanted
with the PicoBlaze. I'm sure it would have taken a couple days to get
my own Verilog-based system up and running and any changes I wanted to
make would be hours more rather than minutes.

Please, consider using the PicoBlaze approach supplied by Xilinx to
drive that display. I know of no support available to you otherwise
(except for the data *** for the controller pointed out in the
development board User Guide and that's just the basics).

- John- Hide quoted text -

- Show quoted text -


The LCD Module spec is on the Xilinx website under the parts list for
the board. I have been wresling with something similar and have been
unable to find the interface information for the ML505 board. I
believe ths Spartan board is different. I would like to do the
interface in Verilog also. From the looks of the LCD module spec the
interface to it is not a big thing for a hardware guy like me.
However, there is a CPLD on the ML505 board between the FPGA and the
LCD module. I am attempting to get the info from Xilinx.

john B
.