linux+qt移植颜色偏色,感觉可能是驱动问题__Linux_91_struct_logo_var_

当前位置: 技术问答>linux和unix

linux+qt移植颜色偏色,感觉可能是驱动问题

来源: 互联网发布时间：2016-09-13

本文导语: Linux+Qt移植画线偏色的问题硬件:微控电子at91sam9261 显示屏:友善lcd2vga 支持1024*768 70H +液晶显示器 Linux内核:linux-2.6.34 内核设置: Device Drivers --->Graphics support---> AT91/AT32 LCD Controller support -[] Frame Buffer in internal...

Linux+Qt移植画线偏色的问题

硬件:微控电子at91sam9261
显示屏:友善lcd2vga 支持1024*768 70H +液晶显示器
Linux内核:linux-2.6.34

内核设置:
Device Drivers --->Graphics support--->
AT91/AT32 LCD Controller support
-[] Frame Buffer in internal SRAM
-[*] Use a STN display with AT91/AT32 LCD Controller
Device Drivers --->Graphics support--->Bootu logo --->
---Boot logo
-[*] Standard black and white Linux logo
-[*] Standard 16-color Linux logo
-[*] Standard 224-color Linux logo Linux logo

驱动设置:
vim arch/arm/mach-at91/board-sam9261ek.c

static struct fb_videomode at91_stn_modes[] = {
        {
                .name           = "SP06Q002 @ 75",
                .refresh        = 70,
                .xres           = 1024,          .yres           = 768,
                .pixclock       = KHZ2PICOS(28000),

                .left_margin    = 1,            .right_margin   = 1,
                .upper_margin   = 1,            .lower_margin   = 1,
                .hsync_len      = 96,            .vsync_len      = 2,

                .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED,
        },
};
static struct fb_monspecs at91fb_default_stn_monspecs = {
        .manufacturer   = "HIT",
        .monitor        = "SP06Q002",

        .modedb         = at91_stn_modes,
        .modedb_len     = ARRAY_SIZE(at91_stn_modes),
#if 1
        .hfmin          = 15000,
        .hfmax          = 64000,
        .vfmin          = 50,
        .vfmax          = 150,
#endif
};

#define AT91SAM9261_DEFAULT_STN_LCDCON2 (
ATMEL_LCDC_MEMOR_LITTLE
| ATMEL_LCDC_DISTYPE_TFT
| ATMEL_LCDC_CLKMOD_ALWAYSACTIVE )

static struct atmel_lcdfb_info __initdata ek_lcdc_data = {
        .default_bpp                    = 16,
        .default_dmacon                 = ATMEL_LCDC_DMAEN,
        .default_lcdcon2                = AT91SAM9261_DEFAULT_STN_LCDCON2,
        .default_monspecs               = &at91fb_default_stn_monspecs,
        .atmel_lcdfb_power_control      = at91_lcdc_stn_power_control,
        .guard_time                     = 1,
//#if defined(CONFIG_MACH_AT91SAM9G10EK)
        .lcd_wiring_mode              = ATMEL_LCDC_WIRING_BGR,
        //.lcd_wiring_mode                = ATMEL_LCDC_WIRING_RGB,
//#endif
};

按照以上修改，一开始发现红蓝颜色颠倒,Linux启动的时候小企鹅的脚是蓝色的。
查网上说是要转换成bgr555
微控电子的说是做个个转换线

然后我修改/drivers/video/atmel_lcdfb.c
vim /drivers/video/atmel_lcdfb.c
修改static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
                             struct fb_info *info)函数,在最后加入
var->blue.offset = 0;
var->green.length = 5;
var->red.offset = 10;
var->green.offset = 5;
var->red.length = 5;
var->blue.length = 5;
重新编译后，发现Linux启动的时候小企鹅的脚变成了黄色,

本以为颜色已正常,之后做Qt移植,用Qt预定义的颜色画线测试，发现黑、白、红、蓝、青、绿、黄、紫颜色是正常的,但其他颜色，都偏色。
测试语句
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing,true);
painter.setBrush(QBrush(Qt::green,Qt::SolidPattern));
for(int i=0;i