0x00 環(huán)境說明：

所使用的開發(fā)板為銳爾威視的插針版A33_Vstar

屏幕是買的第三方的KD050FWFPA011-C009A，其中LCD驅(qū)動IC為ILI9806E，所使用的接口為RGB666

0x01 修改系統(tǒng)配置文件:

筆者所使用的A33開發(fā)板的系統(tǒng)配置文件路徑問：

/root/a33_linux/dragonboard/tools/pack/chips/sun8iw5p1/configs/vstar/sys_config.fex

打開該文件，搜索 [disp_init] ，修改[disp_init]配置如下：

[disp_init]
disp_init_enable = 1
disp_mode = 0

screen0_output_type = 1
screen0_output_mode = 2

screen1_output_type = 0
screen1_output_mode = 4

fb0_format = 9
fb0_pixel_sequence = 1
fb0_scaler_mode_enable = 0
fb0_width = 0
fb0_height = 0

fb1_format = 10
fb1_pixel_sequence = 0
fb1_scaler_mode_enable = 0
fb1_width = 0
fb1_height = 0

lcd0_backlight = 255
lcd1_backlight = 255

lcd0_bright = 50
lcd0_contrast = 50
lcd0_saturation = 57
lcd0_hue = 50

lcd1_bright = 50
lcd1_contrast = 50
lcd1_saturation = 57
lcd1_hue = 50

修改[lcd0_para]配置如下：

lcd_used = 1

lcd_driver_name = "default_lcd"
lcd_if = 0
lcd_x = 480
lcd_y = 854
lcd_width =
lcd_height =
lcd_dclk_freq = 33
lcd_pwm_used = 1
lcd_pwm_ch = 0
lcd_pwm_freq = 50000
lcd_pwm_pol = 1
lcd_hbp = 50
lcd_ht = 640
lcd_hfp = 100
lcd_hspw = 10
lcd_vbp = 16
lcd_vt = 1254
lcd_vfp = 20
lcd_vspw = 4
lcd_lvds_if = 0
lcd_lvds_colordepth = 0
lcd_lvds_mode = 0
lcd_frm = 1
lcd_io_phase = 0x0100
lcd_gamma_en = 0
lcd_bright_curve_en = 0
lcd_cmap_en = 0

deu_mode = 0
lcdgamma4iep = 22
smart_color = 90

lcd_bl_en =
lcd_power =
lcd_gpio_0 =port:PH04<1><0><default><1>
lcd_gpio_1 =port:PH05<1><0><default><1>
lcd_gpio_2 =port:PH06<1><0><default><1>
lcd_gpio_3 =port:PH07<1><0><default><1>

lcdd0 = port:PD02<2><0><default><default>
lcdd1 = port:PD03<2><0><default><default>
lcdd2 = port:PD04<2><0><default><default>
lcdd3 = port:PD05<2><0><default><default>
lcdd4 = port:PD06<2><0><default><default>
lcdd5 = port:PD07<2><0><default><default>
lcdd6 =
lcdd7 =
lcdd8 = port:PD10<2><0><default><default>
lcdd9 = port:PD11<2><0><default><default>
lcdd10 = port:PD12<2><0><default><default>
lcdd11 = port:PD13<2><0><default><default>
lcdd12 = port:PD14<2><0><default><default>
lcdd13 = port:PD15<2><0><default><default>
lcdd14 =
lcdd15 =
lcdd16 = port:PD18<2><0><default><default>
lcdd17 = port:PD19<2><0><default><default>
lcdd18 = port:PD20<2><0><default><default>
lcdd19 = port:PD21<2><0><default><default>
lcdd20 = port:PD22<2><0><default><default>
lcdd21 = port:PD23<2><0><default><default>
lcdd22 =
lcdd23 =
lcdclk = port:PD24<2><0><default><default>
lcdde = port:PD25<2><0><default><default>
lcdhsync = port:PD26<2><0><default><default>
lcdvsync = port:PD27<2><0><default><default>

修改完畢之后保存退出

0x02 修改LCD驅(qū)動代碼：

uboot中默認(rèn)的LCD驅(qū)動初始化文件路徑為：

/root/a33_linux/dragonboard/brandy/u-boot-2011.09/drivers/video_sunxi/sunxi_v2/de_bsp/lcd/panels/default_panel.c

首先添加頭文件包含：

#include "default_panel.h"

修改 LCD_panel_init 函數(shù)：

static void LCD_panel_init(u32 sel)
{
LCD_KD050FW_init();
return;
}

在前面添加 LCD_KD050FW_init 函數(shù)的定義：

static void LCD_KD050FW_init(void)
{
RST(1);
sunxi_lcd_delay_ms(1);
RST(0);
sunxi_lcd_delay_ms(10);
RST(1);
sunxi_lcd_delay_ms(200);

//***************************************************************//LCD SETING
write_cmd(0xFF); // Change to Page 1 CMD
write_data(0xFF);
write_data(0x98);
write_data(0x06);
write_data(0x04);
write_data(0x01);

write_cmd(0x08); //Output SDA
write_data(0x10);

write_cmd(0x20);//set DE/VSYNC mode
write_data(0x00);

write_cmd(0x21); //DE = 1 Active
write_data(0x01);

write_cmd(0x30);//Resolution setting 480 X 854
write_data(0x01);

write_cmd(0x31); //Inversion setting 2-dot
write_data(0x00);

write_cmd(0x40); //BT AVDD,AVDD
write_data(0x16); //

write_cmd(0x41);
write_data(0x33);//22

write_cmd(0x42);
write_data(0x03); //VGL=DDVDH+VCIP -DDVDL,VGH=2DDVDL-VCIP

write_cmd(0x43);
write_data(0x09); //SET VGH clamp level

write_cmd(0x44);
write_data(0x06); //SET VGL clamp level

write_cmd(0x50); //VREG1
write_data(0x88);

write_cmd(0x51); //VREG2
write_data(0x88);

write_cmd(0x52); //Flicker MSB
write_data(0x00);

write_cmd(0x53); //Flicker LSB
write_data(0x44); //VCOM

write_cmd(0x55); // //Flicker
write_data(0x49);

write_cmd(0x60);
write_data(0x07);

write_cmd(0x61);
write_data(0x00);

write_cmd(0x62);
write_data(0x07);

write_cmd(0x63);
write_data(0x00);
//++++++++++++++++++ Gamma Setting ++++++++++++++++++//
write_cmd(0xA0); //Positive Gamma
write_data(0x00);
write_cmd(0xA1); //
write_data(0x09);
write_cmd(0xA2); //
write_data(0x11);
write_cmd(0xA3); //
write_data(0x0B);
write_cmd(0xA4); //
write_data(0x05);
write_cmd(0xA5); //
write_data(0x08);
write_cmd(0xA6); //
write_data(0x06);
write_cmd(0xA7); //
write_data(0x04);
write_cmd(0xA8); //
write_data(0x09);
write_cmd(0xA9); //
write_data(0x0C);
write_cmd(0xAA); //
write_data(0x15);
write_cmd(0xAB); //
write_data(0x08);
write_cmd(0xAC); //
write_data(0x0F);
write_cmd(0xAD); //
write_data(0x12);
write_cmd(0xAE); //
write_data(0x09);
write_cmd(0xAF); //
write_data(0x00);
///==============Nagitive
write_cmd(0xC0); //Negative Gamma
write_data(0x00);
write_cmd(0xC1); //
write_data(0x09);
write_cmd(0xC2); //
write_data(0x10);
write_cmd(0xC3); //
write_data(0x0C);
write_cmd(0xC4); //
write_data(0x05);
write_cmd(0xC5); //
write_data(0x08);
write_cmd(0xC6); //
write_data(0x06);
write_cmd(0xC7); //
write_data(0x04);
write_cmd(0xC8); //
write_data(0x08);
write_cmd(0xC9); //
write_data(0x0C);
write_cmd(0xCA); //
write_data(0x14);
write_cmd(0xCB); //
write_data(0x08);
write_cmd(0xCC); //
write_data(0x0F);
write_cmd(0xCD); //
write_data(0x11);
write_cmd(0xCE); //
write_data(0x09);
write_cmd(0xCF); //
write_data(0x00);

write_cmd(0xFF); // Change to Page 6 CMD for GIP timing
write_data(0xFF);
write_data(0x98);
write_data(0x06);
write_data(0x04);
write_data(0x06);

write_cmd(0x00); //
write_data(0x20);
write_cmd(0x01); //
write_data(0x0A);
write_cmd(0x02); //
write_data(0x00);
write_cmd(0x03); //
write_data(0x00);
write_cmd(0x04); //
write_data(0x01);
write_cmd(0x05); //
write_data(0x01);
write_cmd(0x06); //
write_data(0x98);
write_cmd(0x07); //
write_data(0x06);
write_cmd(0x08); //
write_data(0x01);
write_cmd(0x09); //
write_data(0x80);
write_cmd(0x0A); //
write_data(0x00);
write_cmd(0x0B); //
write_data(0x00);
write_cmd(0x0C); //
write_data(0x01);
write_cmd(0x0D); //
write_data(0x01);
write_cmd(0x0E); //
write_data(0x05);
write_cmd(0x0F); //
write_data(0x00);

write_cmd(0x10); //
write_data(0xF0);
write_cmd(0x11); //
write_data(0xF4);
write_cmd(0x12); //
write_data(0x01);
write_cmd(0x13); //
write_data(0x00);
write_cmd(0x14); //
write_data(0x00);
write_cmd(0x15); //
write_data(0xC0);
write_cmd(0x16); //
write_data(0x08);
write_cmd(0x17); //
write_data(0x00);
write_cmd(0x18); //
write_data(0x00);
write_cmd(0x19); //
write_data(0x00);
write_cmd(0x1A); //
write_data(0x00);
write_cmd(0x1B); //
write_data(0x00);
write_cmd(0x1C); //
write_data(0x00);
write_cmd(0x1D); //
write_data(0x00);

write_cmd(0x20); //
write_data(0x01);
write_cmd(0x21); //
write_data(0x23);
write_cmd(0x22); //
write_data(0x45);
write_cmd(0x23); //
write_data(0x67);
write_cmd(0x24); //
write_data(0x01);
write_cmd(0x25); //
write_data(0x23);
write_cmd(0x26); //
write_data(0x45);
write_cmd(0x27); //
write_data(0x67);

write_cmd(0x30); //
write_data(0x11);
write_cmd(0x31); //
write_data(0x11);
write_cmd(0x32); //
write_data(0x00);
write_cmd(0x33); //
write_data(0xEE);
write_cmd(0x34); //
write_data(0xFF);
write_cmd(0x35); //
write_data(0xBB);
write_cmd(0x36); //
write_data(0xAA);
write_cmd(0x37); //
write_data(0xDD);
write_cmd(0x38); //
write_data(0xCC);
write_cmd(0x39); //
write_data(0x66);
write_cmd(0x3A); //
write_data(0x77);
write_cmd(0x3B); //
write_data(0x22);
write_cmd(0x3C); //
write_data(0x22);
write_cmd(0x3D); //
write_data(0x22);
write_cmd(0x3E); //
write_data(0x22);
write_cmd(0x3F); //
write_data(0x22);
write_cmd(0x40); //
write_data(0x22);

write_cmd(0xFF);// Change to Page 7 CMD for GIP timing
write_data(0xFF);
write_data(0x98);
write_data(0x06);
write_data(0x04);
write_data(0x07);

write_cmd(0x17);
write_data(0x22);

write_cmd(0x02);
write_data(0x77);

write_cmd(0x26);
write_data(0xB2);

write_cmd(0xFF); // Change to Page 0 CMD for Normal command
write_data(0xFF);
write_data(0x98);
write_data(0x06);
write_data(0x04);
write_data(0x00);

write_cmd(0x3A);
write_data(0x60);

write_cmd(0x11);
sunxi_lcd_delay_ms(120);
write_cmd(0x29);
sunxi_lcd_delay_ms(25);

}

在前面添加一些相關(guān)函數(shù)的實現(xiàn)：

#define SCLB(x) sunxi_lcd_gpio_set_value(0, 0, x)
#define SDI(x) sunxi_lcd_gpio_set_value(0, 1, x)
#define RST(x) sunxi_lcd_gpio_set_value(0, 2, x)
#define CSB(x) sunxi_lcd_gpio_set_value(0, 3, x)

static void write_cmd(unsigned char cmd)
{
unsigned char i;
CSB(0);
SCLB(0);
SDI(0);
SCLB(1);
for(i=0;i<8;i++){
SCLB(0);
if(cmd & 0x80)
SDI(1);
else
SDI(0);
SCLB(1);
cmd = cmd << 1;
}
CSB(1);
}

void write_data(unsigned char data)
{
unsigned char i;
CSB(0);
SCLB(0);
SDI(1);
SCLB(1);
for(i=0;i<8;i++){
SCLB(0);
if(data & 0x80)
SDI(1);
else
SDI(0);
SCLB(1);
data = data << 1;
}
CSB(1);
}

保存退出之后重新編譯uboot

0x03 重新編譯uboot：

切換到uboot目錄下：

cd ~/a33_linux/dragonboard/brandy/u-boot-2011.09/

重新編譯uboot：

make distclean

make sun8iw5p1_config

make -j8

編譯成功之后重新打包燒錄到板子即可驗證

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