My Custom STM32 Board Boots Only After Pressing Reset

[eva_402]

Hi all,
I designed a custom STM32 board that powers up, but the firmware starts only after I manually press the reset button. Once reset is pressed, everything works normally.

The clock source is an external crystal, and BOOT pins are configured with resistors.

Questions:

1. Should I suspect reset timing, clock startup, or BOOT pin state first?
2. Would increasing reset delay with an RC network help?
3. On the PCB, how close should crystal traces and load capacitors be placed to the MCU pins?

[mƎALLEm]

Hello,

What MCU part number you are using?

You should always provide the MCU part number when posting a question related to STM32.

[Andrew Neil]

As it's a custom board, you need to show its schematic - we have no other way to see it!

How to write your question to maximize your chances to find a solution

 

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@eva_402 wrote:

BOOT pins are configured with resistors.

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How, exactly, are they configured?

 

Have you studied application note AN5673, Getting started with STM32C0 MCU hardware development ?