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Sometime Cant connect to device using St utility on STM32F767

HIzzu
Associate

‎2019-03-31 10:13 AM

I've developed a device with an STM32F767ZIT6 on it. A custom board.

It was always can connect with ST-Link Utils in the beginning but overtime it is very difficult to connect (Cant connect to device) but sometimes it can.

I cant find where the problem comes from, is it power rail problem or what?

Schematics & layout below0690X0000089JVdQAM.png0690X0000089JW1QAM.png

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2 REPLIES 2
Uwe Bonnes
Principal II

‎2019-03-31 01:21 PM

This may depend on what is running on the target. E.g. you can't attach to a programm in deep sleep without some mean to wake up the CPU ( Reset, or wait for wakeup.) Tight loops "while (1);" are also hard to attach too.

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HIzzu
Associate

‎2019-03-31 05:16 PM

The target is empty, no program in it.

but after we erased the flash, it is very difficult to connet.

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