16x2 i2c lcd on raspberry pi 2

sheeny — Sat, 17 Sep 2016 19:58:08 -0000

Hello,

I am trying to make a music player on raspberry with 16x2 lcd support.
I am running volumio os that based debian 8
but i am having trouble at lcdproc and mpdlcd..

I tested my lcd with this script :http://www.recantha.co.uk/blog/?p=4849 and it works

I am using this i2c settings on LCDd.conf

Hitachi HD44780 driver

[hd44780]

Select what type of connection. See documentation for types.

ConnectionType=i2c

Port where the LPT is. Usual value are: 0x278, 0x378 and 0x3BC

Port=0x27

Device of the serial interface [default: /dev/lcd]

Device=/dev/i2c-1

Bitrate of the serial port (0 for interface default)

Speed=0

If you have a keypad connected.

You may also need to configure the keypad layout further on in this file.

Keypad=no

Set the initial contrast (bwctusb and lcd2usb) [default: 500; legal: 0 - 1000]

Contrast=100

Set brightness of the backlight (lcd2usb only) [default: 0; legal: 0 - 1000]

Brightness=500

OffBrightness=0

If you have a switchable backlight.

Backlight=yes

If you have the additional output port ("bargraph") and you want to

be able to control it with the lcdproc OUTPUT command

OutputPort=no

Specifies if the last line is pixel addressable (yes) or it controls an

underline effect (no). [default: yes; legal: yes, no]

Lastline=yes

Specifies the size of the LCD.

In case of multiple combined displays, this should be the total size.

Size=16x2

D7=14
D6=23
D5=24
D4=25
RS=7
EN=8
BL=18

For multiple combined displays: how many lines does each display have.

Vspan=2,2 means both displays have 2 lines.

vspan=2,2

If you have an HD66712, a KS0073 or another 'almost HD44780-compatible',

set this flag to get into extended mode (4-line linear).

ExtendedMode=yes

In extended mode, on some controllers like the ST7036 (in 3 line mode)

the next line in DDRAM won't start 0x20 higher. [default: 0x20]

LineAddress=0x10

Character map to to map ISO-8859-1 to the LCD's character set

[default: hd44780_default; legal: hd44780_default, hd44780_euro, ea_ks0073,

sed1278f_0b, hd44780_koi8_r, hd44780_cp1251, hd44780_8859_5, upd16314 ]

(hd44780_koi8_r, hd44780_cp1251, hd44780_8859_5 and upd16314 are possible if

compiled with additional charmaps)

CharMap=hd44780_8859_5

If your display is slow and cannot keep up with the flow of data from

LCDd, garbage can appear on the LCDd. Set this delay factor to 2 or 4

to increase the delays. Default: 1.

DelayMult=2

Some displays (e.g. vdr-wakeup) need a message from the driver to that it

is still alive. When set to a value bigger then null the character in the

upper left corner is updated every <KeepAliveDisplay> seconds. Default: 0.

KeepAliveDisplay=0

If you experience occasional garbage on your display you can use this

option as workaround. If set to a value bigger than null it forces a

full screen refresh <RefreshDiplay> seconds. Default: 0.

RefreshDisplay=5

You can reduce the inserted delays by setting this to false.

On fast PCs it is possible your LCD does not respond correctly.

Default: true.

DelayBus=true

If you have a keypad you can assign keystrings to the keys.

See documentation for used terms and how to wire it.

For example to give directly connected key 4 the string "Enter", use:

KeyDirect_4=Enter

For matrix keys use the X and Y coordinates of the key:

KeyMatrix_1_3=Enter

KeyMatrix_4_1=Enter
KeyMatrix_4_2=Up
KeyMatrix_4_3=Down
KeyMatrix_4_4=Escape

But when i execute mpdlcd and play a music on mpd. my lcd backlight flickers and turns on and off continuously like shown in video below
http://sendvid.com/oyhasm6a

Please help
Regards

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