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IAgui
IAgui
Associate III
May 9, 2020
Question

Stlink 2-1 Connection problem.

  • May 9, 2020
  • 3 replies
  • 981 views

I am going crazy! I am working with an STM32f745 and I am having SWD connection issues. I have a STlink 2-1 jumpered using the header connection from it over to my board Now, a interesting thing is happening when I probe the SWDCLK and SWIDIO line with a scope the connection is happy. When I take the probes off connection stops working. Please any ideas?

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3 replies

Uwe Bonnes
Uwe Bonnes
Chief
May 9, 2020

Missing or insuffienetn ground wires?

IAgui
IAguiAuthor
Associate III
May 10, 2020

Thank for your reply/ I have verified that my grounds are connected together between both boards and still the same problem/ Anything else I could try?

mromani
mromani
Associate
August 20, 2023

I have the same problem working with a RAK3172 module using two different stlink programmers and with two different custom board designs.

It sometimes work with lower speeds, sometimes with 4000Khz but I always have to connect a probe to the SWCLK line and another probe to GND, even if there is no tester at the other side of the probes (just a piece or wire!).

I tried different boards, modules, usb cables, power sources with the same results.

Did you find the solution? Any ideas?

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