## 修复
- 修复 SGP4 低近地点 q0-s 计算错误，避免传播结果出现 NaN（#219）。
- 修复 SGP4 C3 阻力项分母公式。
- 新增基于 CelesTrak 标准案例的 SGP4 回归测试。
- 修复非中文配置下 UART 条件编译问题。
- 修复 Linux 构建清理脚本并恢复 D / DS3231 双固件发布。

## 固件
- LOSEHU03D.bin：不使用 DS3231。
- LOSEHU03RD.bin：使用 DS3231。

## 修复
- 修复窄带低静噪等级下阈值乘法溢出导致的静噪失效（#174）。
- 修复短信发送、编辑和接收缓冲区终止符越界（#179），保持 52 字节空口协议不变。
- 压缩 BK4819 固定寄存器写入序列，降低 Flash 占用（#207）。

## 固件
- LOSEHU133 / E / EK / K / H / HS 六种固件。
- 多普勒功能已独立发布，请使用 DPL0.3。

# 增强
* 修复了带宽错误
* 增加外置RTC芯片DS3231，使用C920纽扣电池供，可保存时间
# 版本说明
* LOSEHUXXD，未加装DS3231的固件版本
* LOSEHUXXRD，加装了DS3231的固件版本
# 加装DS3231
* 将DS3231的VCC,GND,SCL,SDA与EEPROM上的对应引脚相连
* 将DS3231的VBAT与GND连接至纽扣电池的正负极，我使用的是C920纽扣电池
* DS3231的其他引脚可以悬空不连接
* 下载.ZIP文件获取嘉立创PCB文件，DS3231_PROJ.epro文件为专业版EDA工程文件
<table>
  <tr>
    <td><img src="https://github.com/losehu/uv-k5-firmware-custom/releases/download/DPL0.2/1.jpg"
 alt="Image 1" width="200" /></td>
    <td><img src="https://github.com/losehu/uv-k5-firmware-custom/releases/download/DPL0.2/2.jpg"
 alt="Image 2" width="200" /></td>
  </tr>
  <tr>
    <td><img src="https://github.com/losehu/uv-k5-firmware-custom/releases/download/DPL0.2/3.jpg"
 alt="Image 3" width="200" /></td>
    <td><img src="https://github.com/losehu/uv-k5-firmware-custom/releases/download/DPL0.2/4.jpg"
 alt="Image 4" width="200" /></td>
  </tr>
</table>


---
# Enhancement
* Fixed bandwidth error
* Added external RTC chip DS3231, powered by a C920 coin cell battery, can retain time

# Version Description
* LOSEHUXXD: Firmware version without DS3231 installed
* LOSEHUXXRD: Firmware version with DS3231 installed

# Installing DS3231
* Connect DS3231’s VCC, GND, SCL, and SDA to the corresponding pins on the EEPROM
* Connect DS3231’s VBAT to the positive terminal of the C920 coin cell battery and GND to the negative terminal
* The other pins of DS3231 can be left unconnected
* Download the .ZIP file to get the JLCPCB PCB files，，DS3231_PROJ.epro JLCPCB Project files

# 独立的多普勒频移固件
* 可实时计算卫星方位角、俯仰角、频移、直线距离
* 最多存放45个卫星TLE
<table>
  <tr>
    <td><img src="https://github.com/losehu/uv-k5-firmware-custom/releases/download/DPL0.1/img1.png"
 alt="Image 1" width="200" /></td>
    <td><img src="https://github.com/losehu/uv-k5-firmware-custom/releases/download/DPL0.1/img2.png"
 alt="Image 2" width="200" /></td>
  </tr>
  <tr>
    <td><img src="https://github.com/losehu/uv-k5-firmware-custom/releases/download/DPL0.1/img3.png"
 alt="Image 3" width="200" /></td>
    <td><img src="https://github.com/losehu/uv-k5-firmware-custom/releases/download/DPL0.1/img4.png"
 alt="Image 4" width="200" /></td>
  </tr>
</table>

# 使用条件
* 需要2Mib及以上大小的EEPROM容量
* 需要写入字库(写入后无需再写)，[点此](https://k5.vicicode.cn/#/tool/chi)
* 每次重启需要设置时间
* 需要设置一次经纬度以及高度
# 按键说明
* 按`1` 显示卫星方位图
* 按`4`设置经纬度、高度
* 按`5`设置时间
* 按`8`切换BTC/UTC时间
* 按`0`切换带宽

# [K5Web](https://k5.vicicode.cn/#/tool/sat2)星历写入
* [中国大陆访问](https://k5.vicicode.cn/#/tool/sat2)
* [海外访问](https://k5.vicicode.com/#/tool/sat2)

---

# Independent Doppler Shift Firmware
* Real-time calculation of satellite azimuth, pitch angle, frequency shift, and straight-line distance
* Can store up to 45 satellite TLEs
<table>
  <tr>
    <td><img src="https://github.com/losehu/uv-k5-firmware-custom/releases/download/DPL0.1/img1.png" alt="Image 1" width="200" /></td>
    <td><img src="https://github.com/losehu/uv-k5-firmware-custom/releases/download/DPL0.1/img2.png" alt="Image 2" width="200" /></td>
  </tr>
  <tr>
    <td><img src="https://github.com/losehu/uv-k5-firmware-custom/releases/download/DPL0.1/img3.png" alt="Image 3" width="200" /></td>
    <td><img src="https://github.com/losehu/uv-k5-firmware-custom/releases/download/DPL0.1/img4.png" alt="Image 4" width="200" /></td>
  </tr>
</table>

# Requirements
* Requires EEPROM with a capacity of 2Mib or more
* Requires writing of the font library (write once, no need to rewrite after that), [[Click here](https://k5.vicicode.cn/#/tool/chi)](https://k5.vicicode.cn/#/tool/chi)
* Time needs to be set after each reboot
* Longitude, latitude, and altitude need to be set once

# Key Instructions
* Press `1` to display the satellite azimuth map
* Press `4` to set longitude, latitude, and altitude
* Press `5` to set the time
* Press `8` to toggle between BTC/UTC time
* Press `0` to set the BandWidth

# [[K5Web](https://k5.vicicode.cn/#/tool/sat2)](https://k5.vicicode.cn/#/tool/sat2) Ephemeris Writing
* [[Mainland China Access](https://k5.vicicode.cn/#/tool/sat2)](https://k5.vicicode.cn/#/tool/sat2)
* [[Overseas Access](https://k5.vicicode.com/#/tool/sat2)](https://k5.vicicode.com/#/tool/sat2)

### Bug修复以及新特性
* **感谢BI1UTY对此版本所有更新**
* 已提交至k5web自定义固件中
### Bug修复

1. **菜单上下颠倒**  
   - 连按两次 `F` 键，再按 `EXIT` 键，或 `F+数字键` 后再按 `EXIT` 键等情况下，菜单会上下颠倒。

2. **进入14号菜单后，无法通过数字直接切换至其他菜单**

3. **拼音输入法：**
   - 完善拼音输入光标点的水平位置计算方法，尽量使其与对应文字居中显示。
   - 拼音输入光标点上移一个像素，避免与待选汉字连显。
   - 可选拼音组合大于一页（3个）时，选择第二页的组合后按 `Exit` 删除部分拼音输入，当新的可选组合不足两页时，系统会死机。
   - 输入任意拼音组合后，删除全部拼音输入，再按 `Menu` 将输入位置调整到最后一个字符时，系统会出现错乱。
   - 在 `ENABLE_PINYIN=1 && ENABLE_MDC1200=1 && ENABLE_MDC1200_EDIT=1` 的情况下，26号菜单的 MDC ID 输入数字0-9没有反应。而且，在26号菜单输入后直接进入14号菜单编辑信道名称，会导致输入的内容与待选拼音不符。

4. **DTMF显示：**  
   - 在信道模式下，显示 DTMF 信息时，如果按下 `PTT` 键，DTMF 信息会与小天线图标重合。

5. **以下操作后，按下的第一个按键无效 (`Menu`, `0-9`, `*`, `F`):**
   - 按 `*` 键进入 DTMF 拨号功能，等待8秒自动退出。
   - 按 `*` 键进入 DTMF 拨号功能，输入内容后按 `PTT` 键发射，再按 `*` 键后不做输入，直接按 `PTT` 发射。

6. **主界面显示 bug：**  
   - 双守模式下，上面的信道接收信号后，信道号后面正常显示 `.`，此时如果下面的信道开始接收信号，上下两个信道会同时显示 `.`，直到下面信道信号接收停止。
7. 解决**SI4732收音机拖影**
   - 优化显示逻辑
   - 按`4`可以开关SNR显示，关闭SNR显示可以解决规律噪音问题
### 新特性

1. **增加 T 模式**  
   宝峰 UV5RH 和森海克斯 8600 都有此模式，在某些场景下比较实用。  
   操作： `F+8` 或长按 `8` 键，循环设置：正常模式 → R → T。  
   - 未设置频差方向和频差频率时，三种模式没有区别。  
   - 设置频差方向和频差频率时，三种模式区别如下：
     - **正常模式：** 按频差设置正常收发。
     - **R 模式：** 倒频模式，颠倒正常模式的收发设置。
     - **T 模式：** 按接收频率进行收发。

2. **DTMF联系人加入中文显示**  
   目前，只有第一个字符为非中文时，才能正常显示中文，否则会显示 `NULL`。

3.**SI4732收音机**
   -  按`4`可以开关SNR显示，关闭SNR显示可以解决规律噪音问题
---
### Bug Fixes and New Features

* **Thanks to BI1UTY for all the updates in this version**
* Submitted to k5web custom firmware

### Bug Fixes

1. **Menu Display Reversed**  
   - When pressing the `F` key twice in succession, followed by the `EXIT` key, or pressing `F+number key` followed by `EXIT`, the menu will display upside-down.

2. **Unable to Switch Menus Directly Using Numbers After Entering Menu 14**

3. **Pinyin Input Method:**
   - Improved the horizontal positioning of the pinyin input cursor to align it as centered as possible with the corresponding text.
   - Raised the pinyin input cursor by one pixel to avoid overlapping with candidate characters.
   - When the number of selectable pinyin combinations exceeds one page (more than 3), selecting a combination from the second page and then deleting part of the pinyin input using `Exit` causes the system to crash if the new set of selectable combinations is less than two pages.
   - After inputting any pinyin combination, deleting all the input, and then pressing `Menu` to adjust the input position to the last character, the system becomes disordered.
   - When `ENABLE_PINYIN=1 && ENABLE_MDC1200=1 && ENABLE_MDC1200_EDIT=1` is enabled, inputting digits 0-9 for MDC ID in Menu 26 has no response. Moreover, entering Menu 14 directly after inputting in Menu 26 to edit the channel name causes a mismatch between the input content and the selected pinyin characters.

4. **DTMF Display:**  
   - In channel mode, while displaying DTMF information, pressing the `PTT` key causes the DTMF information to overlap with the small antenna icon.

5. **First Key Press Becomes Invalid (`Menu`, `0-9`, `*`, `F`) After the Following Operations:**
   - Pressing the `*` key to enter the DTMF dialing function, waiting 8 seconds for it to auto-exit.
   - Pressing the `*` key to enter the DTMF dialing function, inputting content, then pressing the `PTT` key to transmit, and pressing the `*` key again without further input, then pressing the `PTT` key to transmit directly.

6. **Main Screen Display Bug:**  
   - In dual-watch mode, when the upper channel is receiving a signal, a `.` is correctly displayed after the channel number. If the lower channel starts receiving a signal, both channels display `.` simultaneously until the lower channel stops receiving the signal.

7. **Fixed **SI4732 Radio** Shadow Effect:**  
   - Optimized display logic.
   - Pressing `4` can toggle the SNR display, and turning off the SNR display resolves the regular noise issue.

### New Features

1. **Added T Mode**  
   Both Baofeng UV5RH and Senhaix 8600 have this mode, which is useful in certain scenarios.  
   Operation: `F+8` or long press the `8` key, cycle through the settings: Normal Mode → R → T.  
   - If the frequency shift direction and offset frequency are not set, all three modes function the same.  
   - When the frequency shift direction and offset frequency are set, the modes differ as follows:
     - **Normal Mode:** Transmits and receives according to the frequency shift settings.
     - **R Mode:** Reverse mode, swaps the transmission and reception settings of Normal Mode.
     - **T Mode:** Transmits based on the receive frequency.

2. **DTMF Contacts Support Chinese Display**  
   Currently, Chinese characters are displayed correctly only if the first character is non-Chinese; otherwise, `NULL` is displayed.

3. **SI4732 Radio:**  
   - Pressing `4` can toggle the SNR display, and turning off the SNR display resolves the regular noise issue.