HD44780 with Shift register

en3rgy · Post by **en3rgy** » October 30th, 2007, 3:25 pm

hello
i build this thing

for http://www.markuszehnder.ch/projects/lcdplugin/
it work nice

is there a plugin or something else HD44780 with Shift register connected to LPT to work with LCD Smartie ?

Post by **mattcro** » October 30th, 2007, 5:45 pm

For parallel port displays, LCD Smartie only supports 8-bit parallel mode - wiring diagram here: http://lcdsmartie.sourceforge.net/circuits.htm

If you are into programming, you can write/modify a display driver for Smartie (C++/C#/delphi) using the example driver framework on the forum.

I've never come across the shift register connection method like this for use on the parallel port, but it's a good way of reducing the number of port pins used... potentially allowing several LCDs to be connected at the same time.

en3rgy · Post by **en3rgy** » October 30th, 2007, 7:34 pm

mattcro wrote: If you are into programming, you can write/modify a display driver for Smartie (C++/C#/delphi) using the example driver framework on the forum.

thank you !

i am not so good in C++/C#/delphi .... i know VB6 ... made alot I/O program there inc somthing similar...
i dont know if it is possible to write those dll in vb6

if not , will try I/O in dot net ... and to build dll

Post by **mattcro** » October 30th, 2007, 11:21 pm

I tried writing a display driver recently in VB.NET 2005 Express, but couldn't make it work - I couldn't figure out how to export DLL functions and am not sure it's even possible. I switched to VC++ and got it working.