ST-LINK/V2 Pins Connections

[Steven Bébin]

Hello,

For an end of study project, I use a STM32L073RZT6 MCU.

I made an STM32 / Breadboard adapter. Like that :

Now, I would like to program this MCU. For this, I was given a ST-LINK / V2.

I used the MCU and ST LINK datasheet to make the following connections:

I then used the ST LINK software to try to connect, impossible!

I tried several things, with the BOOT, Reset .. But nothing helps.

I checked the pins, but absolutely nothing.

Did I forget something to keep it from working?

[berendi]

How do you power the board?

The ST-Link does not supply power to its Vdd pin, it is used to detect the target voltage, so that it can match the signal level.

Use an external power supply with the rated voltage of the microcontroller. Usually 3.3 Volts, but theoretically it can be supplied with anything between 1.8 and 3.6 V. Flashing can be difficult at lower voltages though, so stick with at least 3V.

[Steven Bébin]

The St-Link has a 3.3V pin which I use to power the MCU.

[Steven Bébin · Accepted solution]

I found the problem ... One of the cables was defective... It works well now !

Thank you so much