nucleo-144 Stm32f429: DFU mode not working after a separation of STLINK from the Nucleo board

mpadata · ‎2024-11-18

Hello,

I have a nucleo 144 development board with a stm32f429. Which I was able to record and it worked correctly but then it fell to the floor and the pcb separated from the st-link. And now my program doesn't run, I can't enter DFU mode either.

I tried to set the boot0 pin to 3V3 but I couldn't get it to enter DFU.

SofLit · ‎2024-11-19

Hello,

I think the issue is related to the fact you lost HSE frequency which was generated by the STLINL module (MCO output).

For DFU and CAN bootloader you need an external clock either with an external crystal or with the STLINK MCO output (8MHz), or even with an external precise clock source GBF or similar ..

So you need to solder an external crystal (Example 8MHz) with its load caps:

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Uwe Bonnes · ‎2024-11-19

Expect more damage from a shock the brohe off the STLINK. Otherwise, probably you used MCO as clock source and now MCO is missing...

SofLit · ‎2024-11-19

Hello @mpadata and welcome to the community,

What power you set after the STLINK module was detached from the board?

Do you get 5V at the input of the U6 regulator? check the voltage on 1,3,5 JP3:

Need to have a power supply either on VIN (7 V to 12 V) or 5V on E5V (CN11/6):

From UM1974:

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SofLit · ‎2024-11-19

Hello,

I think the issue is related to the fact you lost HSE frequency which was generated by the STLINL module (MCO output).

For DFU and CAN bootloader you need an external clock either with an external crystal or with the STLINK MCO output (8MHz), or even with an external precise clock source GBF or similar ..

So you need to solder an external crystal (Example 8MHz) with its load caps:

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

zeboss49 · ‎2024-11-19

Did you repair ALL the broken PCB traces between the STlink and the MCU board?

If some trace is missing, debugging does not wotk.

mpadata · ‎2024-11-19

hello, If I was seeing this glass issue, I think that's the problem I'm having. These days I get a crystal and try it, another question I don't get 4p3 capacitors, I get 4p or 4p7, are there no problems with that?

thanks for your response.

SofLit · ‎2024-11-19

@mpadata wrote:

another question I don't get 4p3 capacitors, I get 4p or 4p7, are there no problems with that?

I think it could not induce an issue.

Meanwhile you can refer to the AN2867 "Guidelines for oscillator design on STM8AF/AL/S and STM32 MCUs/MPUs"

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