HD44780 update:
- supports new API - major clean up, more consistent code - uses configfile options - serialLpt works also with only 2 output lines - serialLpt can now use keypad
This commit is contained in:
robijn
+207
-30
@@ -79,7 +79,7 @@ to the input pins.
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If you connect a key like sketched below, then you can only connect one key
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per input pin. It is a simple solution if you need only few keys.
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+ 5V
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O 5V
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-
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@@ -136,7 +136,7 @@ Y1 o---|<---@--@--@
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Y2 o---|<---@--@--@
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Y3 o---|<---@--@--@ + 5V
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Y3 o---|<---@--@--@ O 5V
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diodes | | | ___ |
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1N4148 +----------|___|---+
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@@ -168,6 +168,54 @@ You can buy arrays of keys that are connected like this in the electronics
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shop. They usually call it a matrix keypad. To hook it to lcdproc, you
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would only need to add the resistors and diodes.
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If the driver generates keypresses without that you actually press a key,
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it might be that the unconnected input lines are picking up
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electromagnetic waves from the air. In that case connect the unconnected
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input lines (pin 10, 11, 12, 13 and 15 of the LPT) to VCC.
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1.1.3 Backlight
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---------------
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A small extension allows you to switch the backlight of the display on
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and off. At the moment only the 4bit and winamp connection types support
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this. The extension uses one output pin, you cannot use that pin for other
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functions anymore. The wiring looks like this:
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O 5V
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___ |
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+---|___|--------+
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LPT Sub-D connector | 4k7 |
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| |e
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| ___ b |/
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BL pin o---------------+---|___|------|
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330E |\
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bc327 |c
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| LCD connector
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+--------o 15 backlight
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+--------o 16 GND backlight
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=== GND
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Note: 4k7 means 4,7 kohm and 330E means 330 ohm.
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The BC327 has the following connections:
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_____
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| |
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|bc327|
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|_____|
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| | |
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| | |
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c b e
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Sometimes the backlight connections are not on the 'main' connector, but on
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the side. If that is the case, there is usually NO RESISTOR present to limit
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the current through the LEDs. Therefor you should add a resistor after
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the transistor of 10 ohm.
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1.2 4-bit
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----------
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@@ -219,6 +267,8 @@ The optional keypad can be connected as follows:
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SELIN (13) X3
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nFAULT (15) X4
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The optional backlight wiring should be connected to D5, pin 7.
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1.3 8-bit "Winamp"
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-------------------
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@@ -267,6 +317,8 @@ The optional keypad can be connected as follows:
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SELIN (13) X3
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nFAULT (15) X4
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The optional backlight wiring should be connected to nSEL, pin 17.
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1.4 Extended 8-bit "lcdtime"
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-----------------------------
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@@ -280,6 +332,9 @@ http://metalab.unc.edu/pub/linux/system/status/lcdtime-0.2.tar.gz
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http://metalab.unc.edu/pub/linux/system/status/meter-0.2.tar.gz
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http://metalab.unc.edu/pub/linux/system/status/portato-1.2.tar.gz
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Theoretically this wiring sends the data over twice as slow as the
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winamp or ext8bit wirings, because it only sends 4 bits at a time.
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The LCD connections are:
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printer port LCD
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@@ -321,16 +376,153 @@ The optional keypad can be connected as follows:
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SELIN (13) X3
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nFAULT (15) X4
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The backlight wiring should be attached to nSEL, pin 17. Because the portato
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program (mentioned above) also uses this pin to control the bargraph, you
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cannot use the backlight control together with the bargraph.
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1.5 Serial LPT
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---------------
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This interface uses a handful of wires to interface to the
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HD44780. Suitable for high noise, long connections. Designed by
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Andrew McMeikan <andrewm@engineer.com>. Refer to
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http://members.xoom.com/andrewmuck for details of the connections.
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Andrew McMeikan <andrewm@engineer.com>. The original wiring and
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driver can be found at:
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http://members.xoom.com/andrewmuck
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Note from Joris: I still need to add keypad stuff here
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I (Joris) have extended this driver and the wiring a bit. It now supports
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keys again (it had earlier supported keys, but some time did not).
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Further I have extended the driver and the wiring to be able to run
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using 2 instead of 3 output pins. That's even one less pin ! :)
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Of course the use of fewer lines than the other wirings can not stay
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without drawbacks. In this case the simplicity of the long feeding wires
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is compensated by some intelligence in the decoding of the data. If you
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have no experience with the soldering iron, I do not recommend to build
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this wiring.
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OK, so here is the wiring. First of the 'simple' 3 wires version. IC1 is
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the shift register, a 4094. Do not forget to connect the 5V to pin 16 and
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GND to pin 8 of the IC.
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IC1
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-----------
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| 4094 |
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5V | shift reg | display
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O | | /keys
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| 1| |3
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+----|STR Q0|---------------------o 7 D0
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| | |4 /Y0
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Data | 2| Q1|---------------------o 8 D1
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D3 5 o---------------------------|D |5 /Y1
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| | Q2|---------------------o 9 D2
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| 3|CK |6 /Y2
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D4 6 o---------------------------| Q3|---------------------o 10 D3
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| | |10 /Y3
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| 15| Q4|---------------------o Y4
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+----|OE |11
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| Q5|---------------------o 4 RS
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| |12 /Y5
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| Q6|---------------------o Y6
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| |13
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| Q7|---------------------o Y7
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| |9
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| QS|-- +--o 5 RW
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| __|10 |
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| QS|-- ===
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| |
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-----------
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D2 4 o-------------------------------------------------------------o 6 EN
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D7 9 o-------------------------------------------------------------o 6 EN2
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(2nd LCD)
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5V O-----+--------+----------------------------------+-----o 2 VCC
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|100n O 16 .-.
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--- IC1 | |<---o 3 Vlcd
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--- O 8 | |10k
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| | '-'
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GND | | |
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18..25 o-----------+--------+--------------------------+-------+-----o 1 GND
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=== GND
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The second possible wiring is with 2 output lines. This one is a bit more
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complex. If you do not understand the schematic, do not build it.
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IC2
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-----------
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| 74HCT164 |
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| shift reg | display
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| | /keys
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Data 1| |3
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D3 5 o-----------------------+---|D Q0|---------------------o 7 D0
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| | |4 /Y0
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| 2| Q1|---------------------o 8 D1
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+---|D |5 /Y1
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| Q2|---------------------o 9 D2
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| |6 /Y2
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| Q3|---------------------o 10 D3
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| |10 /Y3
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Clock 8| Q4|---------------------o Y4
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D4 6 o---------------------------|CK |11
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| Q5|---------------------o 4 RS
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___ 9|\ 8 9|_ |12 /Y5
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+--|___|--+----| >o----|R Q6|---------------------o Y6
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| 22k | |/ | |13
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| --- IC1 | Q7|---+ +--o 5 RW
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| --- | | | 5V |
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| |100p ----------- | O ===
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| === | .-.
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| | | |22k
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+--------------------------------------+ | |
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| '-'
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| ___ 11|\ 10 | 5|\ 6
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+--|___|--+----| >o-------------------||----+-----| >o---o 6 EN
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22k | |/ 22p |/
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--- IC1 IC1
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---
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|22p
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| IC1=74HCT14 (6x Schmitt trigger inverter)
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===
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5V O--+-------+------+------+------------------------+-----o 2 VCC
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| | | | 13|\ 12 |
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| | | +---| >o- |
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|100n O 14 O 14 |/ .-.
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--- IC1 IC2 | |<---o 3 Vlcd
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--- O 7 O 7 1|\ 2 3|\ 4 | |10k
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| | | +--| >o- +--| >o- '-'
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GND | | | | |/ | |/ |
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18..25 o--------+-------+------+-------+----------+-----+------+-----o 1 GND
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=== GND
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Also the serialLpt wiring supports a keypad. The 3 wires version supports
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8 keys, or if you use multiple return lines up to 8 x 5 = 40 lines. The
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2 wires version supports 7 keys, or with multiple return lines
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7 x 5 = 35 keys.
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The return lines are the following:
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nACK (10) X0
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BUSY (11) X1
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PAPEREND (12) X2
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SELIN (13) X3
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nFAULT (15) X4
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To understand some of this keypad documentation, do also read the keypad
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section in this document.
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2. Compiling
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@@ -344,33 +536,17 @@ can be done by specifying "--enable-drivers=all" or by
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3. Running
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----------
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Keep in mind the following points.
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Modify the LCDd.conf file before you run LCDd. In this config file are
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detailed instructions on how to configure the HD44780 driver.
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- When specifying the lcd size, do so before the -d argument.
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- Arguments that need to be passed to the driver should be in quotes after
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the -d HD44780 arguments.
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- Use the "-e" argument for extended interfaces (e.g. 3 or more displays as
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indicated by "optional" connections above).
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- Use "-k" to enable the keypad code.
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Then as usual, start LCDd with the correct config file:
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LCDd -c ./LCDd.conf
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for example.
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EXAMPLES:
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For a 4bit connection, 16x2 display on port 0x278
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LCDd -t 16x2 -d HD44780 "-p 0x278"
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For a 4bit, 40x4 display (effectively two 40x2 displays)
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LCDd -t 40x4 -d HD44780 "-v 2,2"
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For a Winamp connection, 20x2 and 20x1 displays
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LCDd -t 20x3 -d HD44780 "-c winamp -v 2,1"
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For a 4bit, 16x2, 16x4 and 16x1 displays
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LCDd -t 16x7 -d HD44780 "-v 2,4,1 -e"
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For help on the parameters for the 8-bit driver (make sure --help is the
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last arguments in quotes):
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LCDd -d HD44780 "-c 8bit --help"
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If you want to override the driver selection in LCDd.conf then use:
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LCDd -c ./LCDd.conf -d HD44780
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If you use this, the HD44780 driver will read the options from the config
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file.
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4. Miscellania
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@@ -381,3 +557,4 @@ This text originally taken from a message by Bill Farrow
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Updated February 2000, Benjamin Tse (blt@ComPorts.com)
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Updated October 2001, Joris Robijn (joris at robijn.net)
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