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Settings: Contrast: Only for LC displays. Brightness: Only for VF displays
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Parallel port:
Select or specify
the parallel port address. Usually LPT1 = 0x378 and LPT2 = 0x278.
If neither of the two addresses is working check in the Windows Device
Manager or in the BIOS which address is used. The LPT port should also
be set to ECP mode.
Interface:
Wiring diagrams: 8-Bit, one controller | 8-Bit, two controllers (4x40 LCD) | 8-Bit, two LCDs (max 4x20 each) | Extended Shift Register (2 wires)
If you have a 4x40 display select '2 Controller'.
More information about the different interfaces is provided in hd44780_howto.txt
Advanced settings:
Backlight circuit:
A small extension allows you to switch the backlight of the display on and off. Only the 8 and 4 bit interface types support
this. The extension uses one output pin, you cannot use that pin for other functions anymore, i.e. only one conroller is supported, it doesn't work with 4x40 modules!
The circuit and wiring are described in hd44780_howto.txt,1.1.3 Backlight.
The cell width and heigth is only for exotic displays (untested...).
Delays:
| Short | a short delay is used after most driver function calls like writing a character etc. |
| Medium |
the medium delay is used during initialization after the interface type has been set |
| Long |
a long delay is used after certain driver functions like clear, home, etc. |
| Init |
the init delay is used during initialization to set the intial interface type |
| Bus delay |
Most important setting:
delay after writing data to the parallel port. |
| Mulitplier |
Default =1, multiplies all
values above by the specified number. |
| Port IO |
µs delays are achieved by
dummy IO calls, not very precise and unpredictable but needs less CPU
cycles. Only use this option if VHR doesn't work. |
| VHR |
Very High Resolution
timer. Extremely precise but not supported by very old CPUs. Attention: Short and Bus delay must be fine tuned, i.e. set to the lowest possible value because VHR is based on 'busy wait' which results in heavy CPU utilization! |
Attention: all delay values are in µs.
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Should be self explaining... |
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Noritake VFD 800
PJRC 24x8
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