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* Automatically exclude the pin for switchable backlight from keypad scanning

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in the 4bit and 8bit wiring. This fixes problems with flickering backlight if
  a slow parallel port is used. IMPORTANT: This may require a hardware change!
* In code comments use the same line names as in the user's guide (Y1/X1
  instead of Y0/X0).
* Add documentation about hd44780-ftdi's 4bit mode.
This commit is contained in:
mmdolze
2010-01-18 22:24:59 +00:00
parent 6fba5cef68
commit 59f3cbdb45
6 changed files with 208 additions and 64 deletions
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server/drivers/hd44780-serialLpt.c
+12 -12
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@@ -31,19 +31,19 @@
* Keypad connection (optional):
* This is connected on the 4094 parallel to the LCD.
* Some diodes and resistors are needed, see further documentation.
* Q1 (4) Y0
* Q2 (5) Y1
* Q3 (6) Y2
* Q4 (7) Y3
* Q5 (14) Y4
* Q6 (13) Y5
* Q7 (12) Y6
* Q1 (4) Y1
* Q2 (5) Y2
* Q3 (6) Y3
* Q4 (7) Y4
* Q5 (14) Y5
* Q6 (13) Y6
* Q7 (12) Y7
* The 'output' of the keys should be connected to the following LPT pins:
* nACK (10) X0
* BUSY (11) X1
* PAPEREND (12) X2
* SELIN (13) X3
* nFAULT (15) X4
* nACK (10) X1
* BUSY (11) X2
* PAPEREND (12) X3
* SELIN (13) X4
* nFAULT (15) X5
* If you want to use as few LPT lines as possible, only use X0.
*
* This file is released under the GNU General Public License. Refer to the