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Code completion/IntelliSense stops working after build in Keil MDK

Thanh Pham

Hello,

I am using Keil MDK version 5.38 with Arm Compiler default 6 on Windows 10 (64-bit).
Device pack: Keil.STM32F4xx_DFP 3.1.1

Issue:
- Code completion and parameter hints work normally when I open the project.
- After a successful build, code suggestions no longer appear (Ctrl+Space does nothing).
- Restarting µVision restores code completion until I build again.

What I tried:
- Verified that Code Completion is enabled in Editor settings.
- Rebuilt all target files.
- Cleared Objects/Listings folders and reopened the project.
- Checked include paths and preprocessor symbols (USE_HAL_DRIVER, STM32F407xx).
- Reinstalled device pack and resolved RTE.

Is this a known issue? How can I fix or work around it?