在用rtthread studio創建工程后，編譯不報錯。在下載時報pyocd找不到包的的錯誤，具體如下：

開始下載程序：2023-04-19 14:56:57
D:RT-ThreadStudio>cd /d D:RT-ThreadStudiorepoExtractDebugger_Support_PackagesRealThreadPyOCD?.1.6
D:RT-ThreadStudiorepoExtractDebugger_Support_PackagesRealThreadPyOCD?.1.6>pyocd.exe flash --target=N32L406CB --erase=auto --frequency=1000000 D:RT-ThreadStudioworkspaceN32L40_CANDebugrtthread.bin
0000672 W Overlapping memory regions in file ./packs/Keil.STM32L4xx_DFP.2.3.0-small.pack (STM32L412C8Tx); deleting outer region. Further warnings will be suppressed for this file. [cmsis_pack]
0000882 C Target type n32l406cb not recognized. Use 'pyocd list --targets' to see currently available target types. See for how to install additional target support. [__main__]
[2mTraceback (most recent call last):
File "pyocdboardboard.py", line 100, in __init__
KeyError: 'n32l406cb'
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "pyocd__main__.py", line 161, in run
File "pyocdsubcommandsload_cmd.py", line 92, in invoke
File "pyocdcorehelpers.py", line 263, in session_with_chosen_probe
File "pyocdcoresession.py", line 213, in __init__
File "pyocdboardboard.py", line 106, in __init__
pyocd.core.exceptions.TargetSupportError: Target type n32l406cb not recognized. Use 'pyocd list --targets' to see currently available target types. See for how to install additional target support.[0m

執行完畢, 耗時：1510ms.

經查找查看報錯信息，提示pyocd在下載時找不到.pack包。

解決方法

1、在國民技術的資料包的目錄：H:N32L40XCLN32L40xxx_V2.1.06-軟件開發套件(Software Development Kit)下面有.pack包：

2、找到pyocd目錄下面，把包拷貝到指定目錄，如下圖：

3、把包的信息添加到pyocd.yaml文件里面：

最后就可以順利下載程序了

【總結】

rtthread在錯誤提示方面非常優秀，經查看錯誤日志，根據提示，很快就解決問題。