Update README.md for EPD42 project details and links

.vscode/settings.json

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+{
+    "spellright.language": [],
+    "spellright.documentTypes": [
+        "latex",
+        "plaintext"
+    ]
+}

README.md

@@ -1,12 +1,16 @@
-# EPD-nRF51
+# EPD42
 
-4.2 寸电子墨水屏固件，带有一个[网页版上位机](https://tsl0922.github.io/EPD-nRF51/)，可以通过蓝牙传输图像到墨水屏。
+[English](README_EN.md)
+
+4.2 寸电子墨水屏固件，带有一个[网页版上位机](https://pengwon.github.io/epd42/)，可以通过蓝牙传输图像到墨水屏。
 
 理论上支持所有 nRF51 系列 MCU，内置 3 个微雪 4.2 寸墨水屏驱动（可切换），同时还支持自定义墨水屏到 MCU 的引脚映射，支持睡眠唤醒（NFC / 无线充电器）。
 
 ## 支持设备
 
-- 老五 4.2 寸价签，黑白双色版本
+硬件是对电商平台上4.2寸墨水屏价签hack而来，可以[点此购买](https://item.taobao.com/item.htm?ft=t&id=874071462547)，支持黑白双色和黑白红三色两种版本。
+
+- 黑白双色版本
 
   ```
   MCU：nRF51822
@@ -20,7 +24,7 @@
 
   ![](html/images/1.jpg)
 
-- 老五 4.2 寸价签，黑白红三色版本
+- 黑白红三色版本
 
   ```
   MCU：nRF51802
@@ -39,17 +43,16 @@
 
 ## 上位机
 
-地址：https://tsl0922.github.io/EPD-nRF51/ 
+地址：https://pengwon.github.io/epd42/ 
 
 ![](html/images/0.jpg)
 
-本项目自带一个基于浏览器蓝牙接口实现的网页版上位机，可通过上面网址访问，或者在本地直接双击打开 `html/index.html` 来使用。
+扫描上方二维码加入微信群，获取更多信息。
 
 ## 开发
 
 > **注意:**
-> - 必须使用 [Keil 5.36](https://img.anfulai.cn/bbs/96992/MDK536.EXE) 或以下版本，nRF51 SDK 只支持 V5 版本的 ARM 编译器，从 5.37 版本开始 Keil 已经不再内置 V5 版本编译器。
-> - `sdk10` 分支为旧版 SDK 代码归档（不再维护），好处是蓝牙协议栈占用的空间小一些，对于小 ROM 芯片友好一点点。
+> - 必须使用 [Keil 5.36](https://img.anfulai.cn/bbs/96992/MDK536.EXE) 或以下版本，nRF51 SDK 只支持 V5 版本的 ARM 编译器，从 5.37 版本开始 Keil 已经不再内置 V5 版本编译器，需要手动安装。
 
 项目配置有几个 `Target`：
 
@@ -69,5 +72,4 @@
 
 ## 致谢
 
-- 屏幕驱动代码来自微雪 [E-Paper Shield](https://www.waveshare.net/wiki/E-Paper_Shield)
-- 网页版上位机代码来自 [atc1441/ATC_TLSR_Paper](https://github.com/atc1441/ATC_TLSR_Paper)
+- 本项目基于 [EPD-nRF51](https://github.com/tsl0922/EPD-nRF51) 分叉而来，感谢原作者的分享和贡献。

README_EN.md

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+# EPD42
+
+[中文](README.md)
+
+4.2 inch e-ink screen firmware with a [web-based upper computer](https://pengwon.github.io/epd42/) that can transfer images to the e-ink screen via Bluetooth.
+
+Theoretically supports all nRF51 series MCUs, built-in 3 micro-snow 4.2 inch e-ink screen drivers (switchable), also supports custom e-ink screen to MCU pin mapping, supports sleep wake-up (NFC / wireless charger).
+
+## Supported Devices
+
+The hardware is hacked from a 4.2 inch e-ink price tag available on e-commerce platforms, you can [click here to buy](https://item.taobao.com/item.htm?ft=t&id=874071462547), supports both black and white dual-color and black, white, and red tri-color versions.
+
+- Black and White Dual-Color Version
+
+  ```
+  MCU: nRF51822
+  RAM: 16K
+  ROM: 128K
+
+  Driver: UC8176 (EPD_4in2)
+  Screen Pins: 0508090A0B0C0D
+  Coil Pins: 07
+  ```
+
+  ![](html/images/1.jpg)
+
+- Black, White, and Red Tri-Color Version
+
+  ```
+  MCU: nRF51802
+  RAM: 16K
+  ROM: 256K
+
+  Driver: UC8276C (EPD_4in2b_V2)
+  Screen Pins: 0A0B0C0D0E0F10
+  Coil Pins: 09
+  LED Pins: 03/04/05 (three LEDs, any one can be used)
+  ```
+
+  ![](html/images/2.jpg)
+
+The default driver and pin mapping are for the black and white dual-color version, other versions need to switch drivers and modify pin mapping.
+
+## Upper Computer
+
+Address: https://pengwon.github.io/epd42/
+
+![](html/images/0.jpg)
+
+Scan the QR code above to join the WeChat group for more information.
+
+## Compilation Targets
+
+- `nRF51822_xxAB`: Used to compile nRF51822 firmware, with built-in black and white dual-color version configuration
+- `nRF51802_xxAA`: Used to compile nRF51802 firmware, with built-in black, white, and red tri-color version configuration
+- `flash_softdevice` Target: Used to flash the Bluetooth protocol stack (only needs to be flashed once)
+
+You can use J-Link or DAPLink as the programmer (you can use [RTTView](https://github.com/XIVN1987/RTTView) to view RTT logs).
+
+**Flashing Process:**
+
+> If you do not modify the code, it is recommended to download the binary firmware from [Releases](https://github.com/tsl0922/EPD-nRF51/releases) for immediate use.
+
+1. Erase all (if Keil cannot erase, try using the programmer's upper computer software to erase)
+2. Switch to the `flash_softdevice` Target corresponding to the MCU, **do not compile, just download** (only needs to be flashed once)
+3. Switch to the Target corresponding to the MCU, compile first, then download
+
+## Acknowledgements
+
+- This project is forked from [EPD-nRF51](https://github.com/tsl0922/EPD-nRF51), thanks to the original author for sharing and contributing.