Programing this LCD HD44780

Save Mart

Im trying to learn how to program this certon LCD...
I was wondering if someone can give me a simple program I can edit to learn from...
Just a simple text program so I can understand LCDs

LCD:
http://www.shopeio.com/inventory/details.asp?id=931&cat=Lcds&sub=Character%20Lcd

LCD spec:
http://www.shopeio.com/inventory/pdf/AMC1602A.pdf

Thanks, Ivan

paulmac

You're in luck, someone has posted an object for this already.

Have a look at LCD Driver HD44780 16x2 4 bit 8 bit DEMO in the Propeller Object Exchange.

Simon Ampleman said...
LCD Driver HD44780 16x2 -- 4 bit or 8 bit -- DEMO for each mode. Very well documented with schematics and clean code easy to use.

Save Mart

·nice! That will help out·alot!

Yah but when I run it... it cant finde the "timing" file...
how do I make or finde that file...
Do I have to add the timeing of my serton LCD?

Thanks, Ivan

Post Edited (Save Mart) : 3/19/2008 4:17:02 AM GMT

StefanL38

Hello Ivan,

oops ! somebody posted even more concrete than me while i was in edit-mode

anyway:

the manual that you quoted above contains some information about the interface (the PINs and their function) and the bitbanging.

here is a website with information about interfacing an HD44780-controller

http://www.myke.com/lcd.htm

if you are common to c/c++ you can google for HD44780-sourcecode for Atmel AVR-MCUs, or ARM-MCUs etc.

using the google-parallax-search engine

gives hits about the keyword 44780

http://search.parallax.com/search?ie=&q=+"f=25"+44780&site=parallax&output=xml_no_dtd&client=parallax&btnG=Google+Search&access=p&sort=&lr=&num=100&ip=88.202.126.34&proxystylesheet=parallax&oe=&filter=p

best regards

Stefan

StefanL38

Helo Ivan,

in the manual on page 134 there is an example how to make a cog wait for milliseconds

PUB Toggle(Pin, DelayMS, Count)
{{Toggle Pin, Count times with DelayMS milliseconds
  in between.  If Count = 0, toggle Pin forever.}}

  dira[noparse][[/noparse]Pin]~~                                'Set I/O pin to output direction 
  repeat                                     'Repeat the following
    !outa[noparse][[/noparse]Pin]                               '  Toggle I/O Pin
    waitcnt(clkfreq / 1000 * DelayMS + cnt)  '  Wait for DelayMS cycles    
  while Count := --Count #> -1               'While not 0 (make min -1)…
  Cog~                                       'Clear Cog ID variable

it is the file (Ch3-Ex10)-Output.spin which is installed by the propellertool
under examples\manual


best regards

Stefan