0.前言

? 由于之前我們已經適配過RGB屏，如果我們去適配了4寸MIPI屏，那么RGB屏就不能使用了。對于4寸屏購買鏈接為：

百問網4寸MIPI屏

LCD_調試指南:https://tina.100ask.net/SdkModule/Linux_LCD_DevelopmentGuide-01/

Display_開發指南:https://tina.100ask.net/SdkModule/Linux_Display_DevelopmentGuide-01/

4寸屏適配資源包：https://forums.100ask.net/uploads/short-url/g7BQ0FPSSnKHSptR2QMjIPwnwno.zip。該資源包里面包含了適配修改后的所有文件（包括驅動程序、設備樹和配置文件等）

1.添加新驅動

將驅動程序添加到

內核的lcd驅動目錄下：

tina-v853-open/kernel/linux-4.9/drivers/video/fbdev/sunxi/disp2/disp/lcd

uboot的lcd驅動目錄下：

tina-v853-open/brandy/brandy-2.0/u-boot-2018/drivers/video/sunxi/disp2/disp/lcd/

由于uboot和內核中的屏驅動會存在一些差別，下面分別展示出uboot和內核中不同的屏驅動。具體源文件可以在4寸屏適配資源包中查看。

1.1 uboot驅動程序

驅動程序頭文件tft08006.h

#ifndef _TFT08006_H
#define _TFT08006_H

#include "panels.h"

extern __lcd_panel_t tft08006_panel;

extern s32 bsp_disp_get_panel_info(u32 screen_id, disp_panel_para *info);

#endif /*End of file*/

驅動程序的C文件tft08006.c

這里只展示與內核不同的部分

__lcd_panel_t tft08006_panel = {
        /* panel driver name, must mach the name of
         * lcd_drv_name in sys_config.fex
         */
        .name = "tft08006",
        .func = {
                .cfg_panel_info = lcd_cfg_panel_info,
                        .cfg_open_flow = lcd_open_flow,
                        .cfg_close_flow = lcd_close_flow,
                        .lcd_user_defined_func = lcd_user_defined_func,
        },
};

1.2 內核驅動程序

驅動程序頭文件tft08006.h

#ifndef _TFT08006_H
#define _TFT08006_H

#include "panels.h"

extern struct __lcd_panel tft08006_panel;

extern s32 bsp_disp_get_panel_info(u32 screen_id, struct disp_panel_para *info);

#endif /*End of file*/

驅動程序的C文件"tft08006.c，這里只展示與uboot不同的部分。

struct __lcd_panel tft08006_panel = {
        /* panel driver name, must mach the name of
         * lcd_drv_name in sys_config.fex
         */
        .name = "tft08006",
        .func = {
                .cfg_panel_info = lcd_cfg_panel_info,
                        .cfg_open_flow = lcd_open_flow,
                        .cfg_close_flow = lcd_close_flow,
                        .lcd_user_defined_func = lcd_user_defined_func,
        },
};

2.修改內核中panels.h和panels.c

由于內核中沒有對tft08006屏驅動有相關的配置，所以我們還需要在panels全志顯示驅動中增加定義。

2.1 修改內核中panels.h

在屏驅動目錄下修改panels.h

book@100ask:~/workspaces/tina-v853-open/kernel/linux-4.9/drivers/video/fbdev/sunxi/disp2/disp/lcd$ vi panels.h

在icn6202屏驅動定義的后面增加tft08006屏驅動定義

#ifdef CONFIG_LCD_SUPPORT_ICN6202
extern struct __lcd_panel icn6202_panel;
#endif
#ifdef CONFIG_LCD_SUPPORT_ICN6202
extern struct __lcd_panel icn6202_panel;
#endif
#ifdef CONFIG_LCD_SUPPORT_NT35510_MIPI
extern struct __lcd_panel nt35510_panel;
#endif

按下ESC，輸入:wq，保存剛才的修改并退出

2.2 修改內核中panels.c

在屏驅動目錄下修改panels.c

book@100ask:~/workspaces/tina-v853-open/kernel/linux-4.9/drivers/video/fbdev/sunxi/disp2/disp/lcd$ vi panels.c

在icn6202屏驅動定義的后面增加tft08006屏驅動定義

#ifdef CONFIG_LCD_SUPPORT_ICN6202
       &icn6202_panel,
#endif
#ifdef CONFIG_LCD_SUPPORT_TFT08006
        &tft08006_panel,
#endif

#ifdef CONFIG_LCD_SUPPORT_NT35510_MIPI
        &nt35510_panel,
#endif

按下ESC，輸入:wq，保存剛才的修改并退出

3.修改內核中Kconfig和Makefile

3.1 修改內核中的Kconfig

修改屏驅動目錄下的Kconfig，使內核配置中增加tft08006屏驅動的，以便后續選擇編譯該屏驅動

在屏驅動目錄下輸入vi Kconfig

tina-v853-open/kernel/linux-4.9/drivers/video/fbdev/sunxi/disp2/disp/lcd$ vi Kconfig

在icn6202屏驅動配置的后面增加tft08006屏驅動配置

config LCD_SUPPORT_ICN6202
       bool "LCD support icn6202 panel"
       default n
       ---help---
               If you want to support icn6202 panel for display driver, select it.

config LCD_SUPPORT_TFT08006
       bool "LCD support tft08006 panel"
       default n
       ---help---
               If you want to support tft08006 panel for display driver, select it.

config LCD_SUPPORT_NT35510_MIPI
        bool "LCD support nt35510_mipi panel"
        default n
        help
                If you want to support nt35510_mipi panel for display driver, select it.

按下ESC，輸入:wq，保存剛才的修改并退出

3.2 修改內核中的Makefile

返回屏驅動的上一級目錄，修改Makefile文件

book@100ask:~/workspaces/tina-v853-open/kernel/linux-4.9/drivers/video/fbdev/sunxi/disp2/disp$ vi Makefile

在icn6202屏驅動編譯規則的后面增加tft08006屏驅動編譯規則

disp-$(CONFIG_LCD_SUPPORT_ICN6202) += lcd/icn6202.o
disp-$(CONFIG_LCD_SUPPORT_TFT08006) += lcd/tft08006.o
disp-$(CONFIG_LCD_SUPPORT_NT35510_MIPI) += lcd/nt35510.o

按下ESC，輸入:wq，保存剛才的修改并退出

4.修改內核配置

在Tina的根目錄下輸入make kernel_menuconfig,進入內核配置界面。

book@100ask:~/workspaces/tina-v853-open$ make kernel_menuconfig

在選中屏驅動前，要確保DISP Driver Support(sunxi-disp2) ，我們的提供的SDK默認已經打開了，如果您之前關閉了，需要在內核配置界面中，進入Video support for sunxi目錄下輸入Y選中sunxi-disp2打開lcd節點配置。

→ Device Drivers 
	→ Graphics support 
		→ Frame buffer Devices 
			→ Video support for sunxi
				<*> DISP Driver Support(sunxi-disp2)

進入屏驅動目錄，輸入Y選中tft08006

→ Device Drivers 
	→ Graphics support 
		→ Frame buffer Devices 
			→ Video support for sunxi 
				→ LCD panels select 
					[*] LCD support tft08006 panel

如下圖所示，選中tft08006屏驅動，編譯到內核中。

保存并推車內核配置界面。

5.修改uboot配置

進入uboot的根目錄下，執行make menuconfig，打開uboot配置界面。

book@100ask:~/workspaces/tina-v853-open/brandy/brandy-2.0/u-boot-2018$ make menuconfig

在選中屏驅動前，要確保DISP Driver Support(sunxi-disp2) ，我們的提供的SDK默認已經打開了，如果您之前關閉了，需要在內核配置界面中，進入Graphics support目錄下輸入Y選中sunxi-disp2打開lcd節點配置。

→ Device Drivers 
	→ Graphics support 
		[*] DISP Driver Support(sunxi-disp2)  --->

進入屏驅動目錄下，輸入Y選中TFT08006屏驅動。

→ Device Drivers 
	→ Graphics support 
		→ LCD panels select 
			 [*] LCD support TFT08006 panel 

如下圖所示，選中tft08006屏驅動。

保存并退出uboot配置界面

6.修改設備樹

設備樹位置：tina-v853-open/device/config/chips/v853/configs/100ask/

book@100ask:~/workspaces/tina-v853-open/device/config/chips/v853/configs/100ask$ ls
BoardConfig.mk  board.dts  buildroot  env.cfg  linux-4.9  sys_config.fex  uboot-board.dts

其中board.dts為內核設備樹，uboot-board.dts為uboot設備樹。

6.1 修改uboot設備樹

在設備樹的目錄下輸入vi uboot-board.dts，編譯uboot設備樹。

book@100ask:~/workspaces/tina-v853-open/device/config/chips/v853/configs/100ask$ vi uboot-board.dts

注釋掉原來的lcd0節點，修改tft08006屏lcd0節點

&lcd0 {
        base_config_start   = <1>;
        lcd_used            = <1>;

        lcd_driver_name     = "tft08006";

        lcd_backlight       = <500>;
        lcd_if              = <4>;

        lcd_x               = <480>;
        lcd_y               = <800>;
        lcd_width           = <52>;
        lcd_height          = <52>;
        lcd_dclk_freq       = <25>;

        lcd_pwm_used        = <1>;
        lcd_pwm_ch          = <9>;
        lcd_pwm_freq        = <50000>;
        lcd_pwm_pol         = <1>;
        lcd_pwm_max_limit   = <255>;

        lcd_hbp             = <10>;
        lcd_ht              = <515>;
        lcd_hspw            = <5>;

        lcd_vbp             = <20>;
        lcd_vt              = <830>;
        lcd_vspw            = <5>;

        lcd_dsi_if          = <0>;
        lcd_dsi_lane        = <2>;
        lcd_dsi_format      = <0>;
        lcd_dsi_te          = <0>;
        lcd_dsi_eotp        = <0>;
        lcd_frm             = <0>;
        lcd_io_phase        = <0x0000>;
        lcd_hv_clk_phase    = <0>;
        lcd_hv_sync_polarity= <0>;
        lcd_gamma_en        = <0>;
        lcd_bright_curve_en = <0>;
        lcd_cmap_en         = <0>;
        lcdgamma4iep        = <22>;

        lcd_gpio_0          = <&pio PH 0 1 0 3 1>;
        pinctrl-0           = <&dsi4lane_pins_a>;
        pinctrl-1           = <&dsi4lane_pins_b>;
        base_config_end     = <1>;

};

在&pio節點后增加復用引腳

         dsi4lane_pins_a: dsi4lane@0 {
                allwinner,pins = "PD1", "PD2", "PD3", "PD4", "PD5", "PD6", "PD7", "PD9", "PD10", "PD11";
                allwinner,pname = "PD1", "PD2", "PD3", "PD4", "PD5", "PD6", "PD7", "PD9", "PD10", "PD11";
                allwinner,function = "dsi";
                allwinner,muxsel = <5>;
                allwinner,drive = <3>;
                allwinner,pull = <0>;
        };

        dsi4lane_pins_b: dsi4lane@1 {
                allwinner,pins = "PD1", "PD2", "PD3", "PD4", "PD5", "PD6", "PD7", "PD9", "PD10", "PD11";
                allwinner,pname = "PD1", "PD2", "PD3", "PD4", "PD5", "PD6", "PD7", "PD9", "PD10", "DP11";
                allwinner,function = "io_disabled";
                allwinner,muxsel = <0xf>;
                allwinner,drive = <1>;
                allwinner,pull = <0>;
        };

6.2 修改內核設備樹

在設備樹的目錄下輸入vi board.dts，編譯內核設備樹。

book@100ask:~/workspaces/tina-v853-open/device/config/chips/v853/configs/100ask$ vi board.dts

注釋掉原來的lcd0節點，修改tft08006屏lcd0節點

&lcd0 {
        base_config_start   = <1>;
        lcd_used            = <1>;

        lcd_driver_name     = "tft08006";

        lcd_backlight       = <500>;
        lcd_if              = <4>;

        lcd_x               = <480>;
        lcd_y               = <800>;
        lcd_width           = <52>;
        lcd_height          = <52>;
        lcd_dclk_freq       = <25>;

        lcd_pwm_used        = <1>;
        lcd_pwm_ch          = <9>;
        lcd_pwm_freq        = <50000>;
        lcd_pwm_pol         = <1>;
        lcd_pwm_max_limit   = <255>;

        lcd_hbp             = <10>;
        lcd_ht              = <515>;
        lcd_hspw            = <5>;

        lcd_vbp             = <20>;
        lcd_vt              = <830>;
        lcd_vspw            = <5>;

        lcd_dsi_if          = <0>;
        lcd_dsi_lane        = <2>;
        lcd_dsi_format      = <0>;
        lcd_dsi_te          = <0>;
        lcd_dsi_eotp        = <0>;
        lcd_frm             = <0>;
        lcd_io_phase        = <0x0000>;
        lcd_hv_clk_phase    = <0>;
        lcd_hv_sync_polarity= <0>;
        lcd_gamma_en        = <0>;
        lcd_bright_curve_en = <0>;
        lcd_cmap_en         = <0>;
        lcdgamma4iep        = <22>;

        lcd_gpio_0          = <&pio PH 0 1 0 3 1>;
        pinctrl-0           = <&dsi4lane_pins_a>;
        pinctrl-1           = <&dsi4lane_pins_b>;
        base_config_end     = <1>;

};

在&pio節點后增加復用引腳

         dsi4lane_pins_a: dsi4lane@0 {
                allwinner,pins = "PD1", "PD2", "PD3", "PD4", "PD5", "PD6", "PD7", "PD9", "PD10", "PD11";
                allwinner,pname = "PD1", "PD2", "PD3", "PD4", "PD5", "PD6", "PD7", "PD9", "PD10", "PD11";
                allwinner,function = "dsi";
                allwinner,muxsel = <5>;
                allwinner,drive = <3>;
                allwinner,pull = <0>;
        };

        dsi4lane_pins_b: dsi4lane@1 {
                allwinner,pins = "PD1", "PD2", "PD3", "PD4", "PD5", "PD6", "PD7", "PD9", "PD10", "PD11";
                allwinner,pname = "PD1", "PD2", "PD3", "PD4", "PD5", "PD6", "PD7", "PD9", "PD10", "DP11";
                allwinner,function = "io_disabled";
                allwinner,muxsel = <0xf>;
                allwinner,drive = <1>;
                allwinner,pull = <0>;
        };

7.增加I2C觸摸

通過拿到的屏幕資料包，我們可以知道該MIPI屏的觸摸芯片為FT5336，下面我們使用全志已經內置好的FT6336觸摸驅動。

7.1 修改設備樹

修改twi2節點，使用ft6336驅動，修改觸摸的范圍。寬X為480，高y為800。其中初始化引腳需要查看V853底板原理圖，其中初始化引腳為PH7，喚醒引腳為PH8。

&twi2 {
        ctp@38 {
                status = "okay";
                ctp_used = <1>;
                ctp_name = "ft6336";
                ctp_twi_id = <0x2>;
                ctp_twi_addr = <0x38>;
                ctp_screen_max_x = <0x480>;
                ctp_screen_max_y = <0x800>;
                ctp_revert_x_flag = <0x0>;
                ctp_revert_y_flag = <0x1>;
                ctp_exchange_x_y_flag = <0x0>;
                ctp_int_port = <&pio PH 7 6 1 3 0xffffffff>;
                ctp_wakeup   = <&pio PH 8 1 1 3 0xffffffff>;
        };
};

對于設備樹的參數意義，可以訪問百問網的Tina站點:https://tina.100ask.net/SdkModule/Linux_Deploy_DevelopmentGuide-02/#39

7.2 修改內核配置

? 由于我們之前適配過了RGB屏觸摸驅動，所以需要進入內核中修改為我們使用的新驅動，進入如下目錄中，按下空格鍵取消勾選之前的觸摸驅動gt9xxnew touchscreen driver，輸入Y選中我們使用的ft6336 touchscreen driver新驅動，并保存退出。

→ Device Drivers 
	→ Input device support 
		→ Touchscreens
			<*>   ft6336 touchscreen driver

7.3 修改驅動程序

修改ft6336.c觸摸驅動程序，這里只展示修改的部分，源文件可見4寸屏適配資源包中查看。

                        input_report_abs(ts->input_dev,
                                        ABS_MT_POSITION_X, -(event->au16_x[i]-480));
                        input_report_abs(ts->input_dev,
                                        ABS_MT_POSITION_Y, -(event->au16_y[i]-800));

7.4 LVGL綁定新觸摸節點

由于Tina使用的默認綁定的觸摸節點為/dev/input/event0，我們需要修改lvgl驅動頭文件中綁定的節點為我們觸摸驅動上報數據的節點，我們觸摸驅動上報的節點為event2，所以需要進入

tina-v853-open/platform/thirdparty/gui/lvgl-8/lv_examples/src目錄下修改lv_drv_conf.h頭文件，如下所示

book@100ask:~/workspaces/tina-v853-open$ cd platform/thirdparty/gui/lvgl-8/lv_examples/src/
book@100ask:~/workspaces/tina-v853-open/platform/thirdparty/gui/lvgl-8/lv_examples/src$ vi lv_drv_conf.h

找到觸摸節點中的LIBINPUT_NAME，將原來的/dev/input/event0修改/dev/input/event2,如下圖紅框內所示。

注意：我們這里修改的是頭文件，可能之前編譯生成過了之后再重新編譯時可能不會再編譯頭文件，導致修改的節點不會生效，可以手動刪除out目錄中的lv_examples示例程序或者直接刪除out目錄重新編譯即可。具體原因可以觀看韋東山老師的《ARM架構與編程》課程中的gcc編譯過程詳解。訪問鏈接為：ARM架構與編程

8.編譯系統并打包生成鏡像

返回Tina根目錄下，輸入make,編譯系統

book@100ask:~/workspaces/tina-v853-open$ make -j4
...
sun8iw21p1 compile Kernel successful
INFO: ----------------------------------------
INFO: build Tina OK.
INFO: ----------------------------------------

打包生成鏡像，輸入pack

book@100ask:~/workspaces/tina-v853-open$ pack
...
Dragon execute image.cfg SUCCESS !
----------image is at----------

33M     /home/book/workspaces/tina-v853-open/out/v853/100ask/openwrt/v853_linux_100ask_uart0.img

pack finish

9.燒錄并測試

? 打包完成后，將新生成的鏡像拷貝到Windows主機電腦上，使用全志PhoenixSuit燒寫工具，燒寫到開發板上。具體可以參考：https://forums.100ask.net/t/topic/2882。燒寫完成后需要斷電，才能連接MIPI屏的排線到MIPI屏接口，注意排線的線序是否一致。

? 接完排線后，重新接入電源，和2條Type-C數據線，再將開關撥向電源接口處上電啟動，啟動時會出現Tina Linux小企鵝logo，進入系統后，可以查看觸摸節點

root@TinaLinux:/# ls /dev/input/
event0  event1  event2

? 我們使用的event2，如果你不確定您的觸摸驅動程序使用的是哪個，可以通過cat /dev/input/event*，其中*表示要查看的是哪一個觸摸節點，例如我使用的是event2，則需要輸入cat /dev/input/event2，此時觸摸屏幕會有上報信息。

? 使用LVGL DEMO示例，輸入lv_examples 0啟動lvgl示例，可以通過點擊屏幕上的UI交互按鈕測試觸摸是否生效。

root@TinaLinux:/# lv_examples 0
wh=480x800, vwh=480x1600, bpp=32, rotated=0
Turn on double buffering.
Turn on 2d hardware acceleration.
Turn on 2d hardware acceleration rotate.