A-6
GPIO WDT BKL Programming
MS-98K1
LVDS Backlight Brightness Control
3. LVDS
Backlight
Brightness
Control
The
LVDS
controller
support
17
level
of
backlight
brightness
value
from
0
(30%)
to
16
(100%)
and
it
is
accessible
through
SMBus.
The
associated
access
method
(
SMBus_ReadByte
,
SMBus_WriteByte
)
provided
in
part
4.
3.1
Set
the
Level
of
LVDS
Backlight
1. Write
0xED
into
address
0x7F
on
SMBus
device
0x42
.
2. Write
desired
backlight
level
from
0x0
(30%)
to
0x10
(100%)
into
address
0x6E
on
SMBus
device
0x42
.
Example:
Set
LVDS
backlight
level
to
0x10
(100%)
SMBus_WriteByte
(0x42,
0x7F,
0xED);
SMBus_WriteByte
(0x42,
0x6E,
0x10
);
//
Set
brightness
to
100%
3.2
Read
the
Level
of
LVDS
Backlight
1.Write
0xED
into
address
0x7F
on
SMBus
device
0x42
.
2.Read
current
backlight
level
from
address
0x6E
on
SMBus
device
0x42
.
Example:
Get
LVDS
backlight
level
SMBus_WriteByte
(0x42,
0x7F,
0xED);
BKL_Value
=
SMBus_ReadByte
(0x42,
0x6E);
