STM32N6570-DK application only starts after USB power cycle
Hello,
I am using an STM32N6570-DK and I am seeing an issue when trying to start a TouchGFX application after programming the board.
My setup is:
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STM32N6570-DK
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TouchGFX Designer 4.26.1
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STM32CubeMX 6.18.1
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STM32CubeIDE 2.2.0
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STM32CubeProgrammer 2.23.0
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ST-LINK firmware: V3J17M11 STM32 Debug+VCP
I created a new project using TouchGFX Designer 4.26.1. The only additional component I added was a simple colored screen, just to have something visible when the application starts.
I then generated the TouchGFX code from Designer and generated the project using STM32CubeMX 6.18.1 for STM32CubeIDE 2.2.0. The complete project builds successfully without any errors.
To program the board, I do the following:
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Set BOOT0 = 0
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Set BOOT1 = 1
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Press the RESET button
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Use the LoadAll.bat script located in the project's Flash scripts folder, from the CubeIDE/Debug, to program the application
The programming process completes successfully.
After programming, I then:
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Set BOOT1 = 0
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Press RESET
However, the application does not start.
The only way I can get the application to start is to completely disconnect the USB cable from the STM32N6570-DK and connect it again. After the USB power cycle, the application starts normally.
What is strange is that I do not remember this behavior with the earlier STM32N6 software packages/tools. When STM32N6 was around version 1.0 / 1.1, I could program the board, switch BOOT1 back to 0, press RESET, and the application would start immediately. A USB power cycle was not required.
Has anything changed in the newer STM32N6 firmware package, boot configuration, Flash programming scripts, or STM32CubeProgrammer/ST-LINK behavior?
Is pressing RESET after changing BOOT1 supposed to be sufficient, or is a full power cycle now required for some reason?
Any suggestions on what I should check would be appreciated.