An LCD module isn't an MBHP module, you buy the LCD screen with the PCB attached and driver chips on-board, and that is your LCD module. Here you can find information how to use an LCD with the Midibox MBHP Core module.
See also: Troubleshooting LCD Displays
This is a 4×20 CLCD
LCD is an acronym for Liquid Crystal Display. It's a particular form of video technology in portable devices, clocks, watches, and computing devices.
LCD displays utilize two sheets of polarizing material with a liquid crystal solution between them. An electric current passed through the liquid causes the crystals to align so that light cannot pass through them. Each crystal, therefore, is like a shutter, either allowing light to pass through or blocking the light. In clocks and counters that use LCDs, the pattern often emulates LEDs, though LCDs are NOT diodes.
Monochrome LCD images usually appear as blue or dark gray images on top of a grayish-white background. Color LCD displays use two basic techniques for producing color, passive matrix is the less expensive of the two technologies.
The other technology, called thin film transistor (TFT) or active matrix, produces color images that are as sharp as traditional CRT displays. Recent passive matrix displays using new CSTN and DSTN technologies produce sharp colors rivaling active matrix displays. Most LCD screens used in notebook computers are backlit to make them easier to read.
MIOS supports internally Hitachi HD44780 compatible character displays. They are the industry standard for the character displays, but not all “standard” displays have this particular chip.You can use a larger LCD, like 2×20 or 4×20, and the standard Midibox projects will just use the 2×16 characters in the top left corner. Many, however, have compatible chips which will work just as well.
Here is a list of compatible CLCD Controllers: Have a look to the datasheet of the display you want to plug, you will get this info. If your LCD has one of these chips, there are good changes to get it work.
These chips have similar instruction set, data bus and timings are like original HD44780 (or faster, which shouldn't matter). But this only means controller chip is compatible with the driver designed for HD44780.
It may not be exactly what you need, forexample it may require a negative backlight voltage, which is independent of the driver IC. It's strongly recommended to get a display, that has a datasheet available.:
Report your experiments / code you've been writing for CLCD to the forum and here if you have a wiki account
Have a look Here
TK's LCD page contains general info on connecting an LCD.
Here is a summary:
The pin assignments of the LCD interface J15 unfortunately aren't straightforward because they were chosen to ease construction of the Core. So, you have to take special care for the interconnections. Pin assignments on the LCD modules also vary. Be sure you get a data sheet with the pinout for your LCD module.
There is an LCD interconnection test available at the MIOS Download section which allows you to toggle each individual data/control pin with a Modulation Wheel of a MIDI keyboard, or with the appr. CC Events - e.g. from MIDI-Ox or MIOS Studio. It's a very useful test to ensure, that all wires are connected, that they are in the right order, and that there are no short circuits between the pins.
Jim Henry wrote a superb guide about LCD soldering which is not only interesting for beginners - thanks Jim!
Some words by TK in response to this question:
The display offsets are handled by MIOS in a way which allows to use the same cursor positions on any kind of LCD. With MIOS_LCD_YAddressSet the LCD specific cursor offsets are mapped to the MIOS specific cursor offsets.
64 characters (0x40) are reserved for each line, up to 4 lines are (natively) supported:
And these lines have to be mapped to the real address offsets of your LCD - this can normaly be found in the datasheet, the most common cases are documented in the functional description of MIOS_LCD_YAddressSet: http://www.ucapps.de/mios_fun.html#MIOS_LCD_YAddressSet
For a 2×40 following settings are working:
(*) note: if a value between 0x80…0xff is specified here, it is assumed that the 3rd and 4th line is mapped to a second LCD
Centering the screen just means to add additional offsets to these addresses, e.g. let's say you've a 2×40 display, but only 16 columns are used, this means that you need to add 12 to each offset:
Thats how MIOS supports LCDs.
So long as the operating system (MIOS) hasn't been uploaded via MIDI, the LCD won't be initialized and shows black bars at the upper line. If you don't see these bars, adjust the contrast pot. The highest contrast can be achieved with V0=0V (you can adjust this voltage with the trimpot P2).
A message should appear on screen once MIOS is up and running.
Note: if you've connected a second LCD, it won't function until an application which supports this option (i.e. MIDIbox SEQ, MIDIbox LC) has been uploaded.