How to use the full width of the 4.3" display in landscape?

Please use following function to send pixel's positoin larger than 480:

write2B(unsigned int v) {

   unsigned char tmp;

    if(v>=255)

    {

        write(255);

        if(v>480) //for position larger than 480, use 3 bytes

        {

   tmp=v/256;

            write(226+tmp);

            tmp=v%256;

            write(tmp);

        }

        else //for position in 255 to 480, use 2 bytes

            write(v - 255);

    }

    else //for position less than 255, use 1 bytes

        write(v);

}