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Merge pull request #220 from phl0/HD44780

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Update HD44780 information
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Jonathan Naylor 2016-11-16 12:35:40 +00:00 committed by GitHub
parent b22429d5dc 5ba27801bb
commit 39bcd9f191
2 changed files with 40 additions and 11 deletions
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9
HD44780.md
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@ -1,9 +0,0 @@
G0WFV's HD44780 todo list ...
As I only have a 2x16 screen at the moment, development has been done based
on this size screen. Where it is simple, I have attempted ***but not tested***
to implement functions for larger screens.
Here's a list of things I would like to accomplish in the near future ...
- Nothing planned at this time! Any suggestions?

42
README.HD44780
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@ -6,11 +6,49 @@ http://wiringpi.com/download-and-install/ which must be installed in all cases.
The HD44780 in 4-bit mode is probably the most common connection method and
wiring details can be found at http://wiringpi.com/dev-lib/lcd-library/
The setup that is commonly used for MMDVM is the 4-bit connection that is also
documented within wiringPi. The HD44780 displays have a standardized 16-pin
connector (14 pins if without backlight). The pin numbers on HD44780 refer to
this standard numbering.
The pin numbers on Raspberry Pi side are the physical pin numbers of the GPIO
pin header, in brackets the wiringPi pin number as these are referred to in the
MMDVM.ini file.
The wiring ist as follows:
HD44780 pin Raspberry Pi GPIO
GND 1 -------- 6 GND
VCC 2 -------- 2 +5V
V0 3 -------- Trimmer between +5V and GND for contrast
RS 4 -------- 26 CE1 (11)
RW 5 -------- 6 GND
E 6 -------- 24 CE0 (10)
D0 7
D1 8
D2 9
D3 10
D4 11 -------- 11 GPIO0 (0)
D5 12 -------- 12 GPIO1 (1)
D6 13 -------- 13 GPIO2 (2)
D7 14 -------- 15 GPIO3 (3)
GND 15 -------- 6 GND
VCC 16 -------- 2 +5V
The relevant part in the MMDVM.ini is like outlined below.
[HD44780]
Rows=4
Columns=20
# For basic HD44780 displays (4-bit connection)
# rs, strb, d0, d1, d2, d3
Pins=11,10,0,1,2,3
To compile MMDVMHost with support for the HD44780 use the following commands.
# cp Makefile.Pi.HD44780 Makefile
# make clean
# make
# make -f Makefile.Pi.HD44780
Other HD44780 variations exist that connect via I2C. Support is also via
wiringPi, but to compile for each I2C device requires a different Makefile