diff --git a/Hardware/Component/Screen/SPI/Waveshare/1.9inch_LCD_Module/1.9inch_LCD_Module_fbtft_驱动_for_RK356x.md b/Hardware/Component/Screen/SPI/Waveshare/1.9inch_LCD_Module/1.9inch_LCD_Module_fbtft_驱动_for_RK356x.md
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+# 1.9inch LCD Module fbtft 驱动 for RK356x
+
+由于需要在 RK356x 平台下驱动 SPI 显示屏，因此做了一下技术调查。这种屏的驱动主要使用 fbtft，这一种 framebuffer 驱动。另一说可以使用基于 DRM 技术的 [TinyDRM](https://github.com/notro/tinydrm) 驱动。
+
+framebuffer 的缺点在于，使用非桌面环境的 Qt 图形程序时不支持视频播放。但是 Qt 的 Animation（AnimatedImage、PropertyAnimation 等） 是可以正常使用的。
+
+我对 TinyDRM 的框架存有许多疑问，但时间有限，不能仔细阅读其框架代码，只好先使用 fbtft 来驱动。
+
+我所使用的 SPI 显示屏是 微雪 的 1.9inch LCD 模块，其控制芯片为 ST7789V2，对于这款芯片，内核是有类似驱动的，参考微雪官方示例代码对此文件和设备树进行修改即可。
+
+Linux 内核版本为 4.9。
+
+## 1. 显示屏信息
+
+本驱动对应 微雪 1.9inch SPI 显示屏，该显示屏参数如下：
+
+- 工作电压： 3.3V/5V
+- 通信接口：SPI
+- 屏幕类型：IPS
+- 控制芯片：ST7789V2
+- 分辨率：170(H)RGB × 320(V)
+- 显示尺寸：22.70 × 42.72mm
+- 像素间距：0.1335 × 0.1335mm
+- 产品尺寸：27.3 × 51.2mm
+- 像素格式：RGB444、RGB565、RGB666
+
+官方资料及参考代码下载见：[微雪 1.9inch LCD Module 资料连接](https://www.waveshare.net/wiki/1.9inch_LCD_Module)
+
+## 2. 接线方式
+
+| LCD Module | RK356x |
+|------------|--------|
+| VCC        | V3.3   |
+| GND        | GND    |
+| DIN  | SPI3_MOSI_M1 |
+| CLK   | SPI3_CLK_M1 |
+| CS       | GPIO4_C4 |
+| DC       | GPIO3_A6 |
+| RST      | GPIO1_A4 |
+| BL       | GPIO3_A5 |
+
+注意 SPI 通讯使用 Mode 0。
+
+## 3. 内核驱动及设备树
+
+Linux 在 /drivers/staging/fbtft 下有 fb_st7789v.c 文件，直接在此文件基础上进行修改，内容如下：
+
+```cpp
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * FB driver for the ST7789V LCD Controller
+ *
+ * Copyright (C) 2015 Dennis Menschel
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <video/mipi_display.h>
+
+#include "fbtft.h"
+
+#define DRVNAME "fb_st7789v"
+
+#define DEFAULT_GAMMA \
+    "70 2C 2E 15 10 09 48 33 53 0B 19 18 20 25\n" \
+    "70 2C 2E 15 10 09 48 33 53 0B 19 18 20 25"
+
+/**
+ * enum st7789v_command - ST7789V display controller commands
+ *
+ * @PORCTRL: porch setting
+ * @GCTRL: gate control
+ * @VCOMS: VCOM setting
+ * @VDVVRHEN: VDV and VRH command enable
+ * @VRHS: VRH set
+ * @VDVS: VDV set
+ * @VCMOFSET: VCOM offset set
+ * @PWCTRL1: power control 1
+ * @PVGAMCTRL: positive voltage gamma control
+ * @NVGAMCTRL: negative voltage gamma control
+ *
+ * The command names are the same as those found in the datasheet to ease
+ * looking up their semantics and usage.
+ *
+ * Note that the ST7789V display controller offers quite a few more commands
+ * which have been omitted from this list as they are not used at the moment.
+ * Furthermore, commands that are compliant with the MIPI DCS have been left
+ * out as well to avoid duplicate entries.
+ */
+enum st7789v_command {
+    PORCTRL = 0xB2,
+    GCTRL = 0xB7,
+    VCOMS = 0xBB,
+    VDVVRHEN = 0xC2,
+    VRHS = 0xC3,
+    VDVS = 0xC4,
+    VCMOFSET = 0xC5,
+    PWCTRL1 = 0xD0,
+    PVGAMCTRL = 0xE0,
+    NVGAMCTRL = 0xE1,
+};
+
+#define MADCTL_BGR BIT(3) /* bitmask for RGB/BGR order */
+#define MADCTL_MV BIT(5) /* bitmask for page/column order */
+#define MADCTL_MX BIT(6) /* bitmask for column address order */
+#define MADCTL_MY BIT(7) /* bitmask for page address order */
+
+/**
+ * init_display() - initialize the display controller
+ *
+ * @par: FBTFT parameter object
+ *
+ * Most of the commands in this init function set their parameters to the
+ * same default values which are already in place after the display has been
+ * powered up. (The main exception to this rule is the pixel format which
+ * would default to 18 instead of 16 bit per pixel.)
+ * Nonetheless, this sequence can be used as a template for concrete
+ * displays which usually need some adjustments.
+ *
+ * Return: 0 on success, < 0 if error occurred.
+ */
+static int init_display(struct fbtft_par *par)
+{
+    par->fbtftops.reset(par);
+    /* turn off sleep mode */
+    // write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);    // 0x11
+    // mdelay(120);
+
+    write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x70);    // 0x36, 0x00-HORIZONTAL, 0x70-VERTICAL
+    /* set pixel format to RGB-565 */
+    write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);    // 0x3A
+    // write_reg(par, MIPI_DCS_ENTER_INVERT_MODE);      // 0x21
+    // write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS, 0x00, 0x00, 0x01, 0x3F); // 0x2A
+    // write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS, 0x00, 0x00, 0x00, 0xEF);   // 0x2B
+    write_reg(par, PORCTRL, 0x0C, 0x0C, 0x00, 0x33, 0x33);  // 0xB2
+    // VGH VGL
+    write_reg(par, GCTRL, 0x35);    // 0xB7
+    // VCOM
+    write_reg(par, VCOMS, 0x13);    // 0xBB
+    write_reg(par, 0xC0, 0x2C);
+    /*
+     * VDV and VRH register values come from command write
+     * (instead of NVM)
+     */
+    write_reg(par, VDVVRHEN, 0x01); // 0xC2
+    // VAP VAN
+    write_reg(par, VRHS, 0x0B);     // 0xC3
+    // VDV
+    write_reg(par, VDVS, 0x20);     // 0xC4
+    write_reg(par, 0xC6, 0x0F);
+    // AVDD AVCL VDS
+    write_reg(par, PWCTRL1, 0xA4, 0xA1);    // 0xD0
+    // write_reg(par, PVGAMCTRL, 0x00, 0x03, 0x07, 0x08, 0x07, 0x15, 0x2A, 0x44, 0x42, 0x0A, 0x17, 0x18, 0x25, 0x27);   // 0xE0
+    // write_reg(par, NVGAMCTRL, 0x00, 0x03, 0x08, 0x07, 0x07, 0x23, 0x2A, 0x43, 0x42, 0x09, 0x18, 0x17, 0x25, 0x27);   // 0xE1
+    write_reg(par, MIPI_DCS_ENTER_INVERT_MODE); // 0x21
+    write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);   // 0x11
+
+    /* VCOM offset = 0V */
+    // write_reg(par, VCMOFSET, 0x20);
+
+    mdelay(50);
+    write_reg(par, MIPI_DCS_SET_DISPLAY_ON);    // 0x29
+    return 0;
+}
+
+/**
+ * set_var() - apply LCD properties like rotation and BGR mode
+ *
+ * @par: FBTFT parameter object
+ *
+ * Return: 0 on success, < 0 if error occurred.
+ */
+static int set_var(struct fbtft_par *par)
+{
+    switch (par->info->var.rotate) {
+    case 0:
+        write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x00);    // 0x36, 0x00-HORIZONTAL, 0x70-VERTICAL
+        break;
+    default:
+        write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x70);    // 0x36, 0x00-HORIZONTAL, 0x70-VERTICAL
+        break;
+    }
+    return 0;
+}
+
+/**
+ * set_gamma() - set gamma curves
+ *
+ * @par: FBTFT parameter object
+ * @curves: gamma curves
+ *
+ * Before the gamma curves are applied, they are preprocessed with a bitmask
+ * to ensure syntactically correct input for the display controller.
+ * This implies that the curves input parameter might be changed by this
+ * function and that illegal gamma values are auto-corrected and not
+ * reported as errors.
+ *
+ * Return: 0 on success, < 0 if error occurred.
+ */
+static int set_gamma(struct fbtft_par *par, u32 *curves)
+{
+    int i;
+    int c;
+
+    for (i = 0; i < par->gamma.num_curves; i++) {
+        c = i * par->gamma.num_values;
+        write_reg(par, PVGAMCTRL+i,
+            curves[c+0],  curves[c+1],  curves[c+2],
+            curves[c+3],  curves[c+4],  curves[c+5],
+            curves[c+6],  curves[c+7],  curves[c+8],
+            curves[c+9],  curves[c+10], curves[c+11],
+            curves[c+12], curves[c+13]);
+    }
+    return 0;
+}
+
+/**
+ * blank() - blank the display
+ *
+ * @par: FBTFT parameter object
+ * @on: whether to enable or disable blanking the display
+ *
+ * Return: 0 on success, < 0 if error occurred.
+ */
+static int blank(struct fbtft_par *par, bool on)
+{
+    if (on)
+        write_reg(par, MIPI_DCS_SET_DISPLAY_OFF);
+    else
+        write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
+    return 0;
+}
+
+static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe,
+                               int ye)
+{
+    switch (par->info->var.rotate) {
+    case 0:
+        xs += 0x23;
+        xe += 0x23;
+        ys += 0x00;
+        ye += 0x00;
+        break;
+    default:
+        xs += 0x00;
+        xe += 0x00;
+        ys += 0x23;
+        ye += 0x23;
+        break;
+    }
+    write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
+                    (xs >> 8) & 0xFF, xs & 0xFF, (xe >> 8) & 0xFF, xe & 0xFF);  // 0x2A
+
+    write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
+                    (ys >> 8) & 0xFF, ys & 0xFF, (ye >> 8) & 0xFF, ye & 0xFF);  // 0x2B
+
+    write_reg(par, MIPI_DCS_WRITE_MEMORY_START);    // 0x2C
+}
+
+static struct fbtft_display display = {
+    .regwidth = 8,
+    .width = 170,
+    .height = 320,
+    .gamma_num = 2,
+    .gamma_len = 14,
+    .gamma = DEFAULT_GAMMA,
+    .fbtftops = {
+        .init_display = init_display,
+        .set_var = set_var,
+        .set_gamma = set_gamma,
+        .blank = blank,
+        .set_addr_win = set_addr_win
+    },
+};
+
+FBTFT_REGISTER_DRIVER(DRVNAME, "sitronix,st7789v", &display);
+
+MODULE_ALIAS("spi:" DRVNAME);
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_ALIAS("spi:st7789v");
+MODULE_ALIAS("platform:st7789v");
+
+MODULE_DESCRIPTION("FB driver for the ST7789V LCD Controller");
+MODULE_AUTHOR("Dennis Menschel");
+MODULE_LICENSE("GPL");
+```
+
+主要的修改是参考示例编写 init_display() 函数中的初始化序列。
+
+其次是 set_addr_win() 函数，xs 等有个偏移，每个屏厂参数都不同。如果你的屏显示出现 **撕裂，错位倾斜** 或者 **偏移**，可能就是这个参数有问题。微雪官方给的参考中，xe 和 ye 进行了 减1 处理，但 Linux 驱动**不需要 减1**，否则显示的图像/文字就会因为减 1 的偏移导致错位倾斜。
+
+这个驱动的显示方向可以由设备树中的 rotate 参数配置，gamma 也可以通过设备树配置。
+
+我所使用的 鲁班猫 1N，设备树配置比较清晰，很容易的在 arch/arm64/boot/dts/rockchip/overlay/rk356x-lubancat-spi3-m1-gpio-cs-overlay.dts 文件中找到了 SPI3 设备，注释掉其中的 spi_dev 并修改如下：
+
+```dts
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/pinctrl/rockchip.h>
+
+/ {
+    compatible = "rockchip,rk3568";
+
+    fragment@0 {
+        target = <&spi3>;
+
+        __overlay__ {
+            status = "okay";
+            #address-cells = <1>;
+            #size-cells = <0>;
+            // SPI gpio 模拟多个 cs 信号 
+            pinctrl-names = "default", "high_speed";
+            pinctrl-0 = <&spi3_cs0 &spi3_cs1 &spi3m1_pins>;
+            pinctrl-1 = <&spi3_cs0 &spi3_cs1 &spi3m1_pins_hs>;
+            cs-gpios = <&gpio4 RK_PC4 GPIO_ACTIVE_LOW>;
+
+            // spi_dev@00 {
+            //  compatible = "rockchip,spidev";
+            //  reg = <0>; //chip select 0:cs0  1:cs1
+            //  spi-max-frequency = <24000000>; //spi output clock
+            // };
+
+            // spi_dev@01 {
+            //  compatible = "rockchip,spidev";
+            //  reg = <1>;
+            //  spi-max-frequency = <24000000>;
+            // };
+
+            st7789v@00 {
+                status = "okay";
+                compatible = "sitronix,st7789v";
+                reg = <0>;
+                spi-max-frequency = <24000000>;
+                rotate = <90>;
+                rgb;
+                fps = <30>;
+                buswidth = <8>;
+                gamma = "0x00 0x03 0x07 0x08 0x07 0x15 0x2A 0x44 0x42 0x0A 0x17 0x18 0x25 0x27\n0x00 0x03 0x08 0x07 0x07 0x23 0x2A 0x43 0x42 0x09 0x18 0x17 0x25 0x27";
+                reset-gpios = <&gpio1 RK_PA4 GPIO_ACTIVE_LOW>;
+                dc-gpios = <&gpio3 RK_PA6 GPIO_ACTIVE_LOW>;
+                led-gpios = <&gpio3 RK_PA5 GPIO_ACTIVE_HIGH>;
+                pinctrl-names = "default";
+                pinctrl-0 = <&st7789v_cmd_pin &st7789v_reset_pin &st7789v_light_pin>;
+                debug = <1>;
+            };
+        };
+    };
+
+    fragment@1 {
+        target = <&pinctrl>;
+
+        __overlay__ {
+            st7789v {
+                // 配置指定引脚的 复用/上下拉/驱动能力 等
+                st7789v_cmd_pin: st7789v_cmd_pin {
+                    rockchip,pins = <3 RK_PA6 RK_FUNC_GPIO &pcfg_pull_up_drv_level_1>;
+                };
+                st7789v_reset_pin: st7789v_reset_pin {
+                    rockchip,pins = <1 RK_PA4 RK_FUNC_GPIO &pcfg_pull_up_drv_level_1>;
+                };
+                st7789v_light_pin: st7789v_light_pin {
+                    rockchip,pins = <3 RK_PA5 RK_FUNC_GPIO &pcfg_pull_up_drv_level_1>;
+                };
+            };
+
+        };
+    };
+
+    // 关 hdmi 等，否则默认显示设备不是 SPI 屏
+    fragment@2 {
+        target = <&route_hdmi>;
+
+        __overlay__ {
+            status = "disabled";
+        };
+    };
+
+    fragment@3 {
+        target = <&hdmi_in_vp0>;
+
+        __overlay__ {
+            status = "disabled";
+        };
+    };
+
+    fragment@4 {
+        target = <&hdmi_in_vp1>;
+
+        __overlay__ {
+            status = "disabled";
+        };
+    };
+
+    fragment@5 {
+        target = <&hdmi>;
+
+        __overlay__ {
+            status = "disabled";
+        };
+    };
+};
+```
+
+需要注意的是，设备树 overlay 加载时间会比较晚，使用 overlay 驱动显示屏将导致无法在上电时立刻 probe 到设备，显示屏会延迟点亮。如果需要上电立刻亮屏，可以将以上设备树配置固定到设备树文件中。