From 7c755e44ee146a328073bb87580d11d95c138039 Mon Sep 17 00:00:00 2001
From: susabolca <susabolca@gmail.com>
Date: Fri, 22 Mar 2024 17:17:49 +0800
Subject: [PATCH] doc: first release

---
 readme.md | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/readme.md b/readme.md
index 10fe2f0..77a3662 100644
--- a/readme.md
+++ b/readme.md
@@ -1 +1,37 @@
 # cc2640r2-etag
+
+cc2640r2 电子标签改电子时钟固件.
+
+目前支持,
+* cc2640r2l_2in13_ssd1680_250x122
+* cc2640r2l_2in9_ssd1680a_296x128
+
+单节或者双节 CR2450 电池供电.
+
+## 编译
+
+IAR 9.40 或 CCS 12.5
+
+SDK: simplelink_cc2640r2_sdk_1_40_00_45
+
+直接 IDE 编译出固件刷入即可. 
+
+## 烧写
+
+电子标签为 cjtag 2 wire, 需要 xds 或者 jlink 烧写器.
+
+## 低功耗蓝牙 BLE5
+
+电子标签使用 BLE5 配置, 兼容 4.2.
+
+可使用 toos 下 cc2640r2_etag.html (chrome 蓝牙) 配置, 或手机端 nRF connect App 配置.
+
+GATT 配置, 
+
+* Main Service UUID: FFF0,
+* Characteristic 配置,
+  - UUID: FFF1, Unix Epoch 时间, uint32, 默认为 0 (1970-01-01)
+  - UUID: FFF2, 时区偏移分钟, int32, 默认为北京时区 (+8*60)
+  - UUID: FFF3, 电池电压 mV, uint16
+  - UUID: FFF4, 温度 摄氏度, int8, (-127 ~ +128)
+