EP9307 problem
 

I have a device with touch screen LCD and backlight using ep9307 controller of ARM processor. The problem is that we need to completely switch off the backlight so as to make the screen look dead.

Being a newbie in this field, I have no idea how to do that. After studying the schematics and user guide I came to know Brightness control register named as BRIGHT.But I have no idea how to write to that register.

I need to know how to do that. Can anyone please help.

Generally it should be just a store instruction at the given address. The function to use is probably one of: outb, outw, outl. You can look for examples of their usage.

However, the LCD probably has a driver and this operation needs to be performed in the right context, so rather in the driver itself. You need to find a good place to add this additional operation.

Thanks for the reply .i would try to find the right place to use these commands