DEV_USB_COMM_ERR for REAL St-link V2

[OWENL]

I bought an ST-link V2 from amazon, this error occured, fearing it may be counterfeit, I then bought another St-link v2 from STM website itself so there is no way it is fake, but the same error still occured. I am on Mac M3 using Cubeprogrammer. There is utterly no documentation on this error. What do i do.

[Amine_Jridi]

Hello @OWENL,

Could you give more context? As shown in the logs, there is no voltage in the ST-LINK, you can try the following:

- Check your hardware setup.

- Update the ST-LINK firmware and use the latest CubeProgrammer version.

If the issue still persists, please provide more information (OS arch, STLINK Led state ....).

Thanks,

Amine.

[TDK]

If the voltage is 0.00 V, it's not going to run. You need to power the board before connecting to it. The programmer does not typically provide power.

[OWENL]

Thanks for your reply. 
1. When i click on firmware update -> open in update mode, i get "error connecting to ST-link, check usb connection and refresh device list"

2. my hardware set up : Since im on a mac, i have the Gray cord's usb end connecting to a usb to usb -c  adaptor, which is conneected to my mac. 

3. THe St-link's LED is red, so there is power, but idk why it still says 0.0V

I think the issue is to do with my USB to USB-c adaptor causing connectivity issues. Ill try to switch to a windows PC and see it it works

[TDK]

0.0 V is the board power, not the power on the ST-Link.

You will need to power the board and connect power from the board to pin 1 on the st link.

[OWENL]

I have connected the Board Stack to a powered Raspberry pi, That should power the board, and i have also shown the pinout of the sh connectors in one of my pictures, i have connected VCC to pin 1 (VAPP), and the others to their respective pins, but im still having the same issue, and there is no way for me to tell if the microcontroller is powered.

[OWENL]

Also, what does it mean by debug authentication?

[TDK · Accepted solution]

Until it says the board has power, it's not going to work. Recheck your power distribution. You haven't shown any of that information here.

Is this a custom board? Is it designed properly? Oriented correctly? VCAP voltage there?

Take a multimeter and measure that voltage is getting to the chip. If it's not, track down where it's lost.

[Amine_Jridi]

Based on the ST-LINK picture, it seems you are using the wrong pins. You can refer to this UM1075 for the correct pinout and wiring.