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Add wiring info to README.HD44780

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phl0 2016-11-16 13:29:27 +01:00
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README.HD44780
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@ -6,6 +6,45 @@ 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