I need to "talk" to HD44780 commun LCD by 2 wires

[jruibarroso]

I need to "talk" to HD44780 commun LCD by 2 wires, with a pic coverting serial to parallel LCD or some circuit to convert serial data to parallel data .

Anyone can post " driver code " and " master code " ?

Thank you ALL

[bsodmike]

There's some schematics for the 3-wire method if you search google (data, clock, enable) using a serial-in parallel-out shift register, and you can tie this down to a 2-wire by shifting in 9bits, and use the 9th bit to trigger the 'enable' line

The shift register allows to pass the serial data in 4-bit mode to the LCD. If speed is important, go parallel, but serial is great if i/o lines are critical.

[PCM programmer]

This company has serial LCD products.
http://www.seetron.com/slcds.htm
They have a "backpack" board that you can solder onto your existing
LCD, and it will provide a serial interface (Tx and Rx pins).
It's called "LCD Serial Backpack®".
They also sell several LCDs with the serial interface built-in.
Download the manuals for information on the LCD commands.


Here is another company that sells serial interface LCDs.
http://www.crystalfontz.com/products/index-ser.html
The LCDs will work with RS232 or SPI interface.
Download the manuals to see the list of commands.


You don't need to start a new thread every time you get a new
idea on serial LCDs. Just add a post onto this existing thread.

[MGP]

SparkFun also sells serial LCDs and LCD serial "backpacks":

http://www.sparkfun.com/commerce/product_info.php?products_id=461

http://www.sparkfun.com/commerce/product_info.php?products_id=812

http://www.sparkfun.com/commerce/product_info.php?products_id=813

http://www.sparkfun.com/commerce/product_info.php?products_id=814

http://www.sparkfun.com/commerce/product_info.php?products_id=462

http://www.sparkfun.com/commerce/product_info.php?products_id=258

[bsodmike]

I have got two of their serial backpacks, which have been coded via the CC5X compiler.

The latest version (iirc v2.5) is ok, but doesn't boot up properly every single time. I plan on porting it over to CCS and see if I can sort it out at some point. The backpacks are great as the total cost is cheaper than getting the PCB prototyped + parts, and it has an ICSP header so you can always re-flash the PIC :D

[jruibarroso]

I have too much standard display and i would like to make my one serial to parallel converter with a pic or 74LS174, maybe ? my problem is i can design code for this kind of controller, i need a "driver" code to add at my project.

[treitmey]

Hex D flip flop?????


I think you would want to use 74HC595
and the driver is here
C:\Program Files\PICC\Drivers\74595.C


Notice that this is the HC type chip.. LS type chips are getting old.

[jruibarroso]

Yes , something like that but to connect an standart LCD16x2

driver code and main program

[PCM programmer]