update readme of powermcu

Signed-off-by: IotaHydrae <writeforever@foxmail.com>

Author: IotaHydrae

software/power_mcu/README.md

@@ -3,15 +3,13 @@
 This project build firmware for "Power" part of Xenia Clock, but it can be also used
 in other project,
 
-<h2>Setup</h2>
+<h2 align="center">Setup</h2>
 
-Requirements for developing
--------------------------------
+<h2>Requirements for developing</h2>
 
 - VScode with PlatformIO extension
 
-Building
--------------------------------
+<h2 align="center">Building</h2>
 
 1. Run `setup.sh` to prepare develop enviroment
 ```
@@ -36,17 +34,25 @@ Remember check this target path in you $PATH
 | P55 | Power Enable        |
 | P54 | ADC battery voltage |
 
-<h2>I2C Protocol Command table</h2>
+<h2>I2C Protocol</h2>
+
+<h3>Register Table</h3>
+
+| Register | Address | Description                  |
+|----------|---------|------------------------------|
+| Clock    | 0x00    | The runing clock of powermcu |
+
+<h3>Command Table</h3>
 
 The default i2c address of slave mode `0x49`, it could changed in `i2c-slave.c`
 
-主机一次性发送arg0 ~ arg3 以及 crc8 校验码 一共5个字节，
+The host sends ARG0 ~ ARG3 and CRC8 check code a total of 5 bytes.
 
-从机接收后，重新计算arg0 ~ arg3 的 crc8 值，与主机发出的比对，如果不一致，则认为传输过程受干扰，此命令无效。
+After receiving the machine, the CRC8 value of the ARG0 ~ ARG3 is re-calculated, and the comparison between the host is not consistent, if it is not consistent, it is considered to be interfered by the transmission process. This command is invalid.
 
 | Command               | byte0 : Address | byte1 : ID | byte2 : arg0 | byte3 : arg1 | CRC8 | Description                                   |
 |-----------------------|------|------|------|------|------|-----------------------------------------------|
-| |  | 无参命令 |
+| |  | Non -parameter command |
 | Power OFF             | 0x49 | 0x01 | 0x00 | 0x00 | 0x56 | 关闭对外供电                                  |
 | Sleep                 | 0x49 | 0x03 | 0x00 | 0x00 | 0x80 | 主机休眠，从机接管控制权                       |
 | |  | 带参命令 |
@@ -56,9 +62,21 @@ The default i2c address of slave mode `0x49`, it could changed in `i2c-slave.c`
 | Set Time | 0x49 | 0x06 | hour | minute | xxx | 设置从机的时间 |
 | Get Time | 0x49 | 0x07 | hour | minute | xxx | 读取从机的时间 |
 
+<h4>0x01 : Power OFF</h4>
+
+关闭对外部供电`VDD_5V` `VDD_3V3`，自身进入掉电模式
+
+<h4>0x02 : Power OFF Alarm</h4>
+
+<h4>0x03 : Sleep</h4>
+
+<h4>0x04 : Sleep Alarm</h4>
+
+
 <h2>Key Behavior</h2>
 
 | Action | Behavior | Description |
 | ---- | --- | --- |
 | Fast short press | 切换运行状态 | 在开机状态下
 | 2 seconds Long press | 开/关机 | 需在完全关机 或者 开机状态下 |
+