st link v2 red led is on

[osman2]

Hello
The LED on the top link is red. Is it a problem with the connection or the driver? I can't figure it out. Can you help me?

[Andrew Neil]

Please see this for how to capture a screenshot - far better than photographing the screen!

https://www.techrepublic.com/article/how-to-take-screenshots-in-windows-10/

 

The pop-up message is telling you that it can't detect any connected STM32 target device:

 

The log shows you that the target supply voltage is only 0.46V

Your Target can't be running with less than half a volt supply!

You need to fix the power supply on the target.

Note that the ST-Link/V2 does not supply power to the target.

 

[osman2]

I know how to take a screenshot but the computer I took it on didn't have internet so I took it with my phone

Should I connect another device to the st-link instead of the computer's usb port?
Thank you for your interest

[Andrew Neil]

The meaning of the LED is described in the User Manual:

https://www.st.com/resource/en/user_manual/um1075-stlinkv2-incircuit-debuggerprogrammer-for-stm8-and-stm32-stmicroelectronics.pdf#page=15

 

So the PC is communicating with the ST-Link, but the ST-Link has not yet had any communication - successful or otherwise - with the Target.

As described in my previous post, your ST-Link can't communicate with your Target because the Target has no power.

The ST-Link can't distinguish this condition from simply having no target connected at all.

[osman2]

I apologize, but I plugged it into other ports, but for some reason the voltage does not increase and stays at 0.46

[Andrew Neil]

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@osman2 wrote:

I plugged it into other ports, but for some reason the voltage does not increase and stays at 0.46

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Again, the ST-Link does not supply power to the Target.

Your screenshot shows that the PC is communicating fine with the ST-Link;  there is no problem there - no need to try different USB ports.

The problem is that your Target is not powered.

How are you trying to power the Target?

What Target is it?

[Tesla DeLorean]

You don't have anything connecting to Pin 1 which should be the VTarget voltage to power the interface buffers on the ST-LINK side

[osman2]

Do I need to give 3.3v from pin1 of the cn3 socket?

[Andrew Neil]

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@osman2 wrote:

Do I need to give 3.3v from pin1 of the cn3 socket?

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Again, see the User Manual - it tells you what connections you need to make between the ST-Link and your Target:

 

CN3 pin 1 (and pin 2) connects to the power supply (VCC) in the Target - it is an input to the ST-Link.

The voltage reported in the Log is what the ST-Link measures at this input.

[osman2]

Dear Andrew

Thank you in advance for your answer.

I have an electronic board I have an electronic board I have a cpu using stm32f103

according to the connection in the socket in the following picture I am connecting to the cn3 socket according to the photo I am connecting 1=1--2=3---3=9---4=7--- 5=20

I can't find where I went wrong.

 

 

[Andrew Neil]

Again, look at the User  Manual:

 

Plus you need a GND connection - any one will do.

 

 

Since you are only using 2 pins for debug (plus NRST), you must be using SWD.

It would be more helpful to label your schematic with the SWD names (rather than JTAG names):

• JTCK = SWCLK
• JTMS = SWDIO

[Andrew Neil]