MSI MS-98F3 - LVDS Backlight Brightness Control

A-6
GPIO WDT BKL Programming MS-98F3
LVDS Backlight Brightness Control
3. LVDSBack lightBr ightnessControl
TheLVD S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)are
providedinpart4.

3.1 SettheLevelofLVDSBa cklight
1. Write0x ED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devic e0x42.

Example:GetLVDSbacklightlevel
SMBus_WriteByte(0x42,0x7F,0xED);
BKL_Value=SMBus_ReadByte(0x42,0x6E);

 