HD44780 and FDI FT232BM

jzagaja · Post by **jzagaja** » January 26th, 2009, 9:33 am

I'm getting troubles with HD44780 and FDI FT232BM. Problem with "DLL initialize error" FTDI_LCD.dll. LCD screen is always blank. Is that wiring issue?

Smartie 5.4.1, x64 dlls, Windows Vista Ultimate x64.

Post by **caesar** » January 27th, 2009, 8:41 am

The lcd should show at startup (power on) black blocks on the first and 3rd line.
If you don't see that then it's a wiring problem.

Also FT232 chips have to be put in bit-bang mode using a program from FTDI's website (at least that is necessary for FT232R that I use).

Post by **limbo** » January 27th, 2009, 6:07 pm

Power on blocks may not be visible if the contrast trimmer is dimmed.
So you have to check your hardware throughly!

As Caesar said: you must see these blocks on start up!

jzagaja · Post by **jzagaja** » January 27th, 2009, 11:27 pm

FT232 chips have to be put in bit-bang mode using a program from FTDI's website

How? Which one - Mprog?

Post by **caesar** » January 28th, 2009, 9:28 pm

That is it, I couldn't remember the name, Mprog.
Can you see the blocks yet?

jzagaja · Post by **jzagaja** » January 29th, 2009, 8:03 pm

There's no such an option "bit bang mode" in mprog. Is it activated from a client? Checked wiring:

http://kazior.org/LCD-FTDI.png

but there's no blocks. Keep trying...

Post by **caesar** » January 29th, 2009, 10:29 pm

There is a problem with the ground connection, you should just connect 2 and 15 on the LCD to GND on the module and drop the connection to RST, VIO, EXT and VOsomething.

Without GND, no blocks...

jzagaja · Post by **jzagaja** » January 30th, 2009, 12:18 am

RST, VIO, EXT and VO should be connected to?

Post by **caesar** » January 30th, 2009, 6:53 am

Not connected according to the FTDI thread here:
http://forums.lcdsmartie.org/viewtopic.php?t=1540

But from my experience VIO should be connected to +5V - VCC

AHA, just seen it.
VO should be VCC on the module, or not? Can't see to good in that picture, then VCC and VIO are tied and connected to LCD pic 2 and 15.

You will just have to connect the two ground pins on the module and then to LCD pin 1 and 16-through 100R like you have it now.

For blocks to show up 10k variable resistor should be turned to ground or just connect pin 3 to GND for testing.

jzagaja · Post by **jzagaja** » January 30th, 2009, 9:20 pm

No idea what's happening. My LCD:

http://www.artronic.pl/o_produkcie.php?id=665?

Post by **caesar** » February 1st, 2009, 12:03 am

The LCD pin 3 must be connected through a 20k pot directly to groung (not to ground and Vcc like you have on the schematic!).

That's your black blocks problem, contrast isn't set right.

jzagaja · Post by **jzagaja** » February 1st, 2009, 11:32 am

Still failed to open device