Struct Layer 

#[repr(C)]
pub struct Layer {
    pub config: RW<u8>,
    pub mapbase: RW<u8>,
    pub tilebase: RW<u8>,
    pub hscroll: RW<u16>,
    pub vscroll: RW<u16>,
}

Video layer registers

The features of the two VERA layers are the same. Each layer supports a few different modes which are specified using T256C / ‘Bitmap Mode’ / ‘Color Depth’ in Lx_CONFIG. The layer can either operate in tile mode or bitmap mode. This is selected using the ‘Bitmap Mode’ bit; 0 selects tile mode, 1 selects bitmap mode. The handling of 1 bpp tile mode is different from the other tile modes. Depending on the T256C bit the tiles use either a 16-color foreground and background color or a 256-color foreground color. Other modes ignore the T256C bit.

Fields

config: RW<u8>

Lx_CONFIG

mapbase: RW<u8>

Lx_MAPBASE - Map Base Address (16:9)

tilebase: RW<u8>

Lx_TILEBASE

hscroll: RW<u16>

H-SCROLL - Horizontal scroll

vscroll: RW<u16>

V-SCROLL - Vertical scroll