LVDS

调试 LVDS 屏，使用 simple-panel 驱动，在 menuconfig 界面配置屏规格书中的时序和规格参数即可。配置流程如下：

在 Luban-Lite 根目录下执行 me，进入 menuconfig 的功能配置界面。

1. 选择显示接口：

   Board options  --->
       [*] Using Display Engine (DE)
           Display Parameter  --->
               select Display interface (Display LVDS interface)  --->
               LVDS interface options  --->
   

2. 配置下列接口参数：

   Board options  --->
     Graphics Support  --->
         Graphics support
             [*] Display Support
                 select Display interface (Display LVDS interface)  --->
                 LVDS interface options  --->
                     lvds mode (vesa-24)  --->
                     lvds link mode (single link 1)  --->
   

3. 配置屏参数：

   Board options  --->
       Graphics Support  --->
           Graphics support
               [*] Display Support
                   select Display interface (Display LVDS interface)  --->
                   LVDS interface options  --->
                   Display Panels  --->
                       ArtInChip Panel Drivers (ArtInChip simple panel)  --->
                       display timing of simple panel  --->
   

4. 配置 LVDS Link 通道顺序和极性

   根据原理图修改配置文件 ``bsp/artinchip/drv/display/disp_conf.h``

   使用硬件设计指南的推荐设计，不需要修改下列参数

   注： 显示接口参数详解可参考 Luban-Lite SDK 指南 Display 使用指南章节

   /* lvds link swap enable, swap lvds link0 and link1 */
       #define AIC_LVDS_LINK_SWAP_EN   0
   
       /**
       * lvds channel output order
       *
       * default LVDS_LANES(LVDS_D3, LVDS_CK, LVDS_D2, LVDS_D1, LVDS_D0)
       *
       * link 0 default D3         CK         D2         D1         D0
       *                PD26/PD27  PD24/PD25  PD22/PD23  PD20/PD21  PD18/PD19
       *
       * link 1 default D3         CK         D2         D1         D0
       *                PD16/PD17  PD14/PD15  PD12/PD13  PD10/PD11  PD8/PD9
       *
       *
       * link 0 example LVDS_LANES(LVDS_D2, LVDS_CK, LVDS_D3, LVDS_D1, LVDS_D0)
       *
       *                D2         CK         D3         D1         D0
       *                PD26/PD27  PD24/PD25  PD22/PD23  PD20/PD21  PD18/PD19
       *
       * link1 example is the same as link0
       */
       #define AIC_LVDS_LINK0_LANES      LVDS_LANES(LVDS_D3, LVDS_CK, LVDS_D2, LVDS_D1, LVDS_D0)
       #define AIC_LVDS_LINK1_LANES      LVDS_LANES(LVDS_D3, LVDS_CK, LVDS_D2, LVDS_D1, LVDS_D0)
   
       /**
       * lvds channel polarities
       *
       * link 0 default 0b00000
       *                PD26/PD27  PD24/PD25  PD22/PD23  PD20/PD21  PD18/PD19
       *                N/P        N/P        N/P        N/P        N/P
       *
       * link 1 default 0b00000
       *                PD16/PD17  PD14/PD15  PD12/PD13  PD10/PD11  PD8/PD9
       *                N/P        N/P        N/P        N/P        N/P
       *
       *
       * link 0 example 0b01010
       *                PD26/PD27  PD24/PD25  PD22/PD23  PD20/PD21  PD18/PD19
       *                N/P        P/N        N/P        P/N        N/P
       *
       * link1 example is the same as link0
       */
       #define AIC_LVDS_LINK0_POL        0b00000
       #define AIC_LVDS_LINK1_POL        0b00000

5. 编辑 pinmux.c 文件配置引脚。

   以 demo128-nand 工程为例，在 target/d21x/demo128-nand/pinmux.c 中添加以下配置：

   LVDS 有三组引脚配置，根据使用的模式进行选择，以下为 LVDS 引脚组合：

   #ifdef AIC_LVDS_LINK_0 // lvds link mode = single link 0
           {3, PIN_PULL_DIS, 3, "PD.18"},
           {3, PIN_PULL_DIS, 3, "PD.19"},
           {3, PIN_PULL_DIS, 3, "PD.20"},
           {3, PIN_PULL_DIS, 3, "PD.21"},
           {3, PIN_PULL_DIS, 3, "PD.22"},
           {3, PIN_PULL_DIS, 3, "PD.23"},
           {3, PIN_PULL_DIS, 3, "PD.24"},
           {3, PIN_PULL_DIS, 3, "PD.25"},
           {3, PIN_PULL_DIS, 3, "PD.26"},
           {3, PIN_PULL_DIS, 3, "PD.27"},
       #endif#ifdef AIC_LVDS_LINK_1 // lvds link mode = single link 1
           {3, PIN_PULL_DIS, 3, "PD.8"},
           {3, PIN_PULL_DIS, 3, "PD.9"},
           {3, PIN_PULL_DIS, 3, "PD.10"},
           {3, PIN_PULL_DIS, 3, "PD.11"},
           {3, PIN_PULL_DIS, 3, "PD.12"},
           {3, PIN_PULL_DIS, 3, "PD.13"},
           {3, PIN_PULL_DIS, 3, "PD.14"},
           {3, PIN_PULL_DIS, 3, "PD.15"},
           {3, PIN_PULL_DIS, 3, "PD.16"},
           {3, PIN_PULL_DIS, 3, "PD.17"},
       #endif#if defined(AIC_LVDS_DOUBLE_SCREEN) || defined(AIC_LVDS_DUAL_LINK) // lvds link mode = double screen / dual link
           {3, PIN_PULL_DIS, 3, "PD.8"},
           {3, PIN_PULL_DIS, 3, "PD.9"},
           {3, PIN_PULL_DIS, 3, "PD.10"},
           {3, PIN_PULL_DIS, 3, "PD.11"},
           {3, PIN_PULL_DIS, 3, "PD.12"},
           {3, PIN_PULL_DIS, 3, "PD.13"},
           {3, PIN_PULL_DIS, 3, "PD.14"},
           {3, PIN_PULL_DIS, 3, "PD.15"},
           {3, PIN_PULL_DIS, 3, "PD.16"},
           {3, PIN_PULL_DIS, 3, "PD.17"},
           {3, PIN_PULL_DIS, 3, "PD.18"},
           {3, PIN_PULL_DIS, 3, "PD.19"},
           {3, PIN_PULL_DIS, 3, "PD.20"},
           {3, PIN_PULL_DIS, 3, "PD.21"},
           {3, PIN_PULL_DIS, 3, "PD.22"},
           {3, PIN_PULL_DIS, 3, "PD.23"},
           {3, PIN_PULL_DIS, 3, "PD.24"},
           {3, PIN_PULL_DIS, 3, "PD.25"},
           {3, PIN_PULL_DIS, 3, "PD.26"},
           {3, PIN_PULL_DIS, 3, "PD.27"},
       #endif