St-Link V3 SWD to stm32L452 JUST DOES NOT WORK

[SLevi.1]

Cube programmer (and st-link utility) cannot find the target when I try to connect to flash a device. I am using the SWD connection to my target. I have connected T_Vcc, gnd, clk, dio & nrst on CN6 of the MB1440B mezzanine board. Cube programmer recognises the st-link, sees 3.2v on the target vcc, but always reports "Error No STM32 target found".

I have tried the same connections on the same target using a st-link V2 on a Nucleo board, and that works ok. I have also tried the Nucleo against a blue pill target, and again that works. Neither target is recognised by the st-link V3. Are there any special settings in cube programmer (or st-link utility) I need to look at? As far as I know, I have the latest drivers and firmware installed on the st-link v3.

[Aziz BRIGUI]

Hello @nonesuchevitt​,

Thank you for posting and sorry for the late reply,

I couldn't reproduce your issue on my side, could you please describe your connections precisely. I tested using a NUCLEO-L452RE, my connections are as follows (Please refer to UM1724 page 28) :

STLINK-V3 (CN6) | NUCLEO-L452RE

T_VCC => CN6 (4)

CLK => CN7(15)

GND => CN6(6)

DIO => CN7(13)

NRST => CN6(3)

I was able to connect using STM32CubeProgrammer and ST-LINK Utility. As far as I know, there are no special settings to configure.

Looking forward to your response.

Best regards,

Aziz

[SLevi.1]

Thanks for taking the time to answer. However, it still does not work. I connected a Nucleo452RE board as you specified, and powered it via the nucleo USB mini port. I removed the CN2 jumpers at the top of the nucleo board just in case. In the STM cube programmer output I see only:

 17:24:10 : ST-LINK SN : 001900283137510839383538

 17:24:10 : ST-LINK FW : V3J9M3B5S1

 17:24:10 : Board    : STLINK-V3SET

 17:24:10 : Voltage   : 3.26V

 17:24:10 : No STM32 target found!

 17:24:10 : ST-LINK SN : 001900283137510839383538

 17:24:10 : ST-LINK FW : V3J9M3B5S1

 17:24:10 : Board    : STLINK-V3SET

 17:24:10 : Voltage   : 3.26V

 17:24:10 : Error: No STM32 target found!

[Tesla DeLorean]

Does seem a bit odd, have you tried knocking down the connection speed to 1 or 2 MHz?

Or connect/reset options. Behave differently with BOOT0 pulled HIGH?

Device's tend to go into low power modes

[SLevi.1]

I've tried all different combinations of connection speed, frequency, reset mode etc. Still no joy.