SV4401A Firmware V0.7.5 features:

1. Optimized the function of long-pressing Ctrl button to set the marker frequency. Now the marker frequency can be set precisely by interpolation.
2. Fixed the bug where the minimum SPAN value was 50kHz.
3. Added a scan progress bar.
4. New signal generator UI, and the sweep mode is supported.
5. New command: touch x,y[DOWN/UP], which allows simulating screen touch.
6. New text file browser, supporting txt/xml/json/csv/log and other text formats.  
7. Supports loading s1p file as reference data for port extension.  
8. [SAVE / RECALL] moved from main menu to the [CAL] menu.  
9. Compatible with the new version of PC software SVxx01A_Tools v0.2.0, keyboard and file operations are supported.

<Experimental Features>
Firmware 0.7.5 supports pikapython, and you can run custom scripts in two ways:
1. Go to the menu [Script Function] -> [Run Python] to select and run a script.
2. Use the command: pikapython  path  to run a specific script.
Note: The APP manager is used to manage and launch custom script packages. An app package is a folder with a package name, and the root directory of this folder contains the essential main running script main.py and the corresponding display icon app_icon.bmp (64*64).


--------------------------------------------------------------------------------------------------------------------------------------


SV4401A V0.7.5 固件特性：

1.优化了长按Ctrl指定标记点频率功能，通过内插算法精确设定标记点频率。
2.修复了SPAN最小值为50kHz的BUG。
3.新增扫描进度条。
4.全新的信号发生器UI，并新增了扫描模式。
5.新增命令：touch x,y[DOWN/UP]，使用该命令可模拟屏幕触摸。
6.文件管理器新增文本浏览器功能，支持txt/xml/json/csv/log等文本格式。
7.端口延伸功能支持加载s1p文件作为参考数据。
8.主菜单【保存回调】迁移到【校准】菜单下。
9.适配新版本上位机软件SVxx01A_Tools v0.2.0，已支持键盘、文件操作。

<实验性功能>
0.7.5固件支持pikapython，可通过以下两种方法运行自定义脚本：
1.通过菜单【脚本功能】->【运行python】选择脚本文件运行。
2.使用命令：pikapython path 运行指定的脚本文件。
注：APP管理器用于管理、启动自定义脚本包。app包是一个含包名的文件夹，该文件夹的根目录含有必须的主运行脚本main.py和对应显示图标app_icon.bmp(64*64)。