AM335X用RGB888连接LCD如何以16位色彩模式显示图片

static int fb_check_var(struct fb_var_screeninfo *var,

            struct fb_info *info)

{

    int err = 0;

    struct da8xx_fb_par *par = info->par;

    int bpp = var->bits_per_pixel >> 3;

    unsigned long line_size = var->xres_virtual * bpp;

    switch (var->bits_per_pixel) {

    case 1:

    case 8:

        var->red.offset = 0; 

        var->red.length = 8; 

        var->green.offset = 0;

        var->green.length = 8;

        var->blue.offset = 0;

        var->blue.length = 8;

        var->transp.offset = 0;

        var->transp.length = 0;

        break;

    case 4:

        var->red.offset = 0;

        var->red.length = 4;

        var->green.offset = 0;

        var->green.length = 4;

        var->blue.offset = 0;

        var->blue.length = 4;

        var->transp.offset = 0;

        var->transp.length = 0;

        break;

    case 16:        /* RGB 565 */

        var->red.offset = 11;  //改成var->blue.offset = 11;

        var->red.length = 5;   //改成var->blue.length = 5; 

        var->green.offset = 5;

        var->green.length = 6;

        var->blue.offset = 0;  //改成var->red.offset = 0; 

        var->blue.length = 5;  //改成var->red.length = 5;

        var->transp.offset = 0;

        var->transp.length = 0;

        break;

    case 24:

        var->red.offset = 16;

        var->red.length = 8;

        var->green.offset = 8;

        var->green.length = 8;

        var->blue.offset = 0;

        var->blue.length = 8;

        break;

    case 32:

        var->transp.offset = 24;

        var->transp.length = 8;

        var->red.offset = 16;

        var->red.length = 8;

        var->green.offset = 8;

        var->green.length = 8;

        var->blue.offset = 0;

        var->blue.length = 8;

        break;

    default:

        err = -EINVAL;

    }

    var->red.msb_right = 0;

    var->green.msb_right = 0;

    var->blue.msb_right = 0;

    var->transp.msb_right = 0;

    if (line_size * var->yres_virtual > par->vram_size)

        var->yres_virtual = par->vram_size / line_size;

    if (var->yres > var->yres_virtual)

        var->yres = var->yres_virtual;

    if (var->xres > var->xres_virtual)

        var->xres = var->xres_virtual;

    if (var->xres + var->xoffset > var->xres_virtual)

        var->xoffset = var->xres_virtual - var->xres;

    if (var->yres + var->yoffset > var->yres_virtual)

        var->yoffset = var->yres_virtual - var->yres;

    return err;

}