在进行嵌入式开发的时候,文件传输是比较麻烦的 在调试过程中,最方便的方式是使用nfs进行文件目录共享 记录一下在设备和ubuntu之间共享的方法

在ubuntu上开启nfs共享

1. 安装和开启nfs-server服务

sudo apt install nfs-kernel-server

2. 配置共享文件目录

此时可以创建一个新目录 或者使用 开发目录来进行共享,这里以 /home/my/dev 为例

sudo vi /etc/exports

添加

/home/my/dev  192.168.*(rw,sync,no_root_squash)

如果出现Protocol not supported 可以在 /etc/default/nfs-kernel-server末尾添加

PRCNFSDORTS="--nfs-version 2,3,4 --debug --syslog"

3. 刷新服务

sudo systemctl restart nfs-server.service

4. 检查状态

sudo exportfs -v

前言

最近打算用树莓派做为智能显示驱动来搭配手头的一台咖啡机来实现一个真正的智能咖啡机,但是搭配ubuntu一类操作系统开机速度太慢了,找了很久也没有发现可以在数秒之内开机的树莓派映像,所以一直在寻找如何能够构建一个最小的操作系统。

buildroot

问题记录

  1. 直接使用buildroot官方版本的 defconfig文件 无法打开显卡驱动 系统大小约100M 可以通过fbdev的驱动显示画面,但是没有gpu的情况下,整个画面性能非常糟糕。 此时,尝试使用weston+drm+egl的方式,失败报错。 ls /dev/dri 无法找到节点 尝试使用insmod 加载 drm.ko 等模块,无效 经过比较 buildroot的defconfg和 raspberry git上提供的不一样,改用树莓派提供的buildroot

  2. 使用raspberry提供的buildroot版本依然不能打开 drm 此时显卡驱动是以模块形式编译需要通过模块加载启动

    modprobe i2c_brcmstb
    modprobe vc4
    modprobe v3d
    modprobe snd_soc_hdmi_codec
  3. 成功加载drm和 v3d v4c后 ,运行weston

    [00:24:19.786] warning: no input devices on entering Weston. Possible causes:
         - no permissions to read /dev/input/event*
         - seats misconfigured (Weston backend option 'seat', udev device property ID_SEAT)

驱动解决后,无法创建gl context

libGL: Can't open configuration file /etc/drirc: No such file or directory.
libGL: Can't open configuration file /root/.drirc: No such file or directory.

daisyUI

https://daisyui.com daisyUI — Tailwind CSS Components WebdaisyUI is a plugin for Tailwind CSS. It works on all JS frameworks and doesn't need a JS bundle file. Install daisyUI as a dev dependency and use the class names just like any …

Chakra UI

https://chakra-ui.com Chakra UI - A simple, modular and accessible component … WebCreate accessible React apps. with speed. Chakra UI is a simple, modular and accessible component library that gives you the building blocks you need to build your React applications.

mantine (UI)

https://mantine.dev/

Global web icon

react-icons.github.io https://react-icons.github.io/react-icons React Icons - GitHub Pages WebReact Icons. Include popular icons in your React projects easily with react-icons, which utilizes ES6 imports that allows you to include only the icons that your project is using. …

tabler-icons

https://tabler-icons.io/

Over 4850 pixel-perfect icons for web design Free and open source icons designed to make your website or app attractive, visually consistent and simply beautiful.

Introduction to Immer

GitHub Pages https://immerjs.github.io › immer Immer (German for: always) is a tiny package that allows you to work with immutable state in a more convenient way. ‎React & Immer · ‎Using produce · ‎Supporting immer · ‎Installation

hooks

immer

https://zhuanlan.zhihu.com/p/639089491

  1. use-immer库的高级用法 下面我们将介绍use-immer库的高级用法,包括:

3.1 使用produce函数 produce函数是use-immer库中最重要的函数之一。它可以帮助我们更加方便地管理和更新JavaScript对象和数组。下面是一个简单的例子:

import { produce } from 'immer';
const state = {
  todos: [
    { id: 1, text: 'Learn React', completed: true },
    { id: 2, text: 'Learn use-immer', completed: false },
  ],
};
const nextState = produce(state, draftState => {
  draftState.todos.push({ id: 3, text: 'Learn Redux', completed: false });
});
console.log(nextState.todos);

在上面的例子中,我们使用了produce函数来更新state中的todos数组。我们可以看到,使用produce函数可以帮助我们更加方便地更新JavaScript对象和数组。


react snippets

a quick way to create a code template for a component or etc...

rcc

refs

ref is a reference to a element but ref maybe null

react-hook-form

transform several properties

const obj = {
    className: "none",
    size: 14,
    color: "red"
}

<Comp
    { ... obj }
/>

equals

<Comp
    className={obj.className}
    size={obj.size}
    color={obj.color}
/>

... means    loop the obj and set each key to the value

zod , joi , ... validation libs

import { z } from 'zod';

// create the limites
const schema = z.object({
    name: z.string().min(3, {"message":"at least 3 characters."}),
    age: z.number({invalid_type_error:"required"}).min(18) // the api shoud be mobile and ...
})

// create the  interface for data
type FormData = Formz.infer<typeof schema>;
@hookform/resolvers
const {
    register,
    handleSubmit,
    formState: {errors,isValid}
} = 
useForm<FormData>( { resolver: zodResolver(schema) } );
useEffect()

useEffect is similar to a "OnRendered" Callback when JSX modules is rendered then react call this function

finally()

the finally method will be called both succeed or failed when fetch on axios

?. optional link

seemly to swift syntax

obj?.type means obj && obj.type

Abort Signal

Mozilla Developer https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal AbortSignal - Web APIs | MDN WebAug 4, 2023 · English (US) AbortSignal. The AbortSignal interface represents a signal object that allows you to communicate with a DOM request (such as a fetch request) and abort it …

const controller = new AbortController();
const signal = controller.signal;

const url = "video.mp4";
const downloadBtn = document.querySelector(".download");
const abortBtn = document.querySelector(".abort");

downloadBtn.addEventListener("click", fetchVideo);

abortBtn.addEventListener("click", () => {
  controller.abort();
  console.log("Download aborted");
});

function fetchVideo() {
  fetch(url, { signal })
    .then((response) => {
      console.log("Download complete", response);
    })
    .catch((err) => {
      console.error(`Download error: ${err.message}`);
    });
}

Array.reduce()

Mozilla Developer https://developer.mozilla.org/.../Array/Reduce Array.prototype.reduce() - JavaScript | MDN - MDN Web … WebSep 14, 2023 · Array.prototype.reduce () Try it. The reducer walks through the array element-by-element, at each step adding the current array value to the... Syntax.

JavaScript Array filter()

WebThe filter () method creates a new array filled with elements that pass a test provided by a function. The filter () method does not execute the function for empty elements.

随着智能化在生活的方方面面深入,家电设备上的智能化需求也是在不断增长。 同时伴随着芯片行业的飞速发展、芯片的国产化进程不断推进,在家用电器上内嵌一块显示屏、并且提供智能化的设备服务已经成为一个行业趋势。

本文从需求、行业特性、技术架构几个角度试图探索、分析和预测一下家电行业的智能化趋势。


需求:智能家电的本质是什么?

科技的世俗目的是扩展人类的能力边界,而计算机则是大大降低了人脑在记忆、数据处理方面的心智成本,“智能”则是站在体验的角度,基于一个高性能设备,通过各类交互和流程设计,令计算机(设备)的使用更符合人类的直觉感观体验,能够让用户更加“随心所欲”操控计算机的概括。

a. 其智能化的程度主要体现在用户通过直觉体验能够对于设备操作的精细度以及完成复杂的组合式目标的便捷和直观程度上。

比起智能手机、汽车与家电的相似性更高,都是在可以完全通过机械操作完成设备的工作。其智能化的程度主要体现在用户通过直觉体验能够对于设备操作的精细度以及完成复杂的组合式目标的便捷和直观程度上。(这里的智能实际上是设备本身替代和减少人类思考决策和操作而形成的机器智能的感观体验,而并不是设备本身一定具有切实的AI能力)

- 阅读剩余部分 -

lv_draw_sw_img_decoded

img_decoded 是用于解码图片并且将图片绘制到指定buffer区域。

LV_ATTRIBUTE_FAST_MEM 
void lv_draw_sw_img_decoded
(
struct _lv_draw_ctx_t * draw_ctx,
const lv_draw_img_dsc_t * draw_dsc,
const lv_area_t * coords, 
const uint8_t * src_buf, 
lv_img_cf_t cf
)

/**
    struct _lv_draw_ctx_t * draw_ctx        // 绘制上下文
    const lv_draw_img_dsc_t * draw_dsc      // 图像素材绘制描述
    const lv_area_t * coords                // 绘制区(图像在output buffer上的绝对定位)
    const uint8_t * src_buf                  // 图像buffer
    lv_img_cf_t cf                          // 图像色彩格式
**/

绘制上下文中,与当前绘制图像相关的属性:

typedef struct _lv_draw_ctx_t  {
    /**
     *  Pointer to a buffer to draw into
     */
    void * buf;

    /**
     * The position and size of `buf` (absolute coordinates)
     */
    lv_area_t * buf_area;

    /**
     * The current clip area with absolute coordinates, always the same or smaller than `buf_area`
     */
    const lv_area_t * clip_area;

} lv_draw_ctx_t;

与图像本身的绘制效果相关的:

typedef struct {

    int16_t angle;
    uint16_t zoom;
    lv_point_t pivot;

    lv_color_t recolor;
    lv_opa_t recolor_opa;

    lv_opa_t opa;
    lv_blend_mode_t blend_mode : 4;

    int32_t frame_id;
    uint8_t antialias       : 1;
} lv_draw_img_dsc_t;

在进行macOS嵌入式调试的时候,用gdbserver报错 使用pyenv安装2.7之后同样无果,后使用安装包安装解决

dyld[675]: Library not loaded: /System/Library/Frameworks/Python.framework/Versions/2.7/Python
  Referenced from: <26C16900-9C5F-32FC-9593-0458A2B42E1C> /Users/mac/dev/arm-unknown-linux-gnueabihf/bin/arm-unknown-linux-gnueabihf-gdb
  Reason: tried: '/System/Library/Frameworks/Python.framework/Versions/2.7/Python' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/System/Library/Frameworks/Python.framework/Versions/2.7/Python' (no such file), '/System/Library/Frameworks/Python.framework/Versions/2.7/Python' (no such file, not in dyld cache), '/Library/Frameworks/Python.framework/Versions/2.7/Python' (no such file)

copied from: https://blog.shahednasser.com/how-to-install-python-2-on-mac-12-3/

As of macOS 12.3+, Python 2 which was installed by default at /usr/bin/python have been removed. This can lead to a lot of issues for developers that need to use Python 2 or that use other tools that depend on it.

Install Python 2 To install Python2 again, simply download the macOS universal installer from Python's website

After downloading the installer run it to install Python 2. This will automatically install Python in /usr/local/python as well.

Test it Out You can run Python 2 in your terminal now and other tools using it will no longer have issues:

python

lvgl doc flex

lv_obj_set_layout(obj, LV_LAYOUT_FLEX)

The possible values for flex_flow are:

LV_FLEX_FLOW_ROW: Place the children in a row without wrapping
不换行的ROW

LV_FLEX_FLOW_COLUMN: Place the children in a column without wrapping

LV_FLEX_FLOW_ROW_WRAP: Place the children in a row with wrapping

LV_FLEX_FLOW_COLUMN_WRAP: Place the children in a column with wrapping

LV_FLEX_FLOW_ROW_REVERSE: Place the children in a row without wrapping but in reversed order

LV_FLEX_FLOW_COLUMN_REVERSE: Place the children in a column without wrapping but in reversed order

LV_FLEX_FLOW_ROW_WRAP_REVERSE: Place the children in a row with wrapping but in reversed order

LV_FLEX_FLOW_COLUMN_WRAP_REVERSE: Place the children in a column with wrapping but in reversed order



The possible values are:

LV_FLEX_ALIGN_START: means left on a horizontally and top vertically. (default)

LV_FLEX_ALIGN_END: means right on a horizontally and bottom vertically

LV_FLEX_ALIGN_CENTER: simply center

LV_FLEX_ALIGN_SPACE_EVENLY: items are distributed so that the spacing between any two items (and the space to the edges) is equal. Does not apply to track_cross_place.

LV_FLEX_ALIGN_SPACE_AROUND: items are evenly distributed in the track with equal space around them. Note that visually the spaces aren't equal, since all the items have equal space on both sides. The first item will have one unit of space against the container edge, but two units of space between the next item because that next item has its own spacing that applies. Not applies to track_cross_place.

LV_FLEX_ALIGN_SPACE_BETWEEN: items are evenly distributed in the track: first item is on the start line, last item on the end line. Not applies to track_cross_place.


很多时候需要对文件、文件夹进行批量处理 如果直接使用递归 -R 来做的话,一般就无法区分文件和文件夹

使用find就可以根据需要自由的查找并进行进一步处理

 find . -type f -exec chmod 644 {} \;
find . -type d -exec chmod 744 {} \;