Hi! I am unable to detect my STM32L4Q5 MCU with ST-Link V2. Do I need to buy the ST Link V3? How do I interface it with the JTAG/SWD programming port? I thought that STM32L4P5 and Q5 family were retro-pintopin-compatible with previous L4 families?

[VNado.1]

Thanks!

[Tesla DeLorean]

A real/authentic one?

Should be able to work with current firmware.

Watch for powering buffers with VTarget

Pretty much need SWDIO, SWCLK, NRST, SWO, VCC, GND to get it working effectively.

[VNado.1]

I think I have all of this except SWO, what is it? My VCC is 3.3V

[Tesla DeLorean]

I'm using a classic stand-alone ST-LINK/V2 with L011, L432 and L4R9 parts, so L4 / L4+ should be viable

[Uwe Bonnes]

Is the ST-LINK firmware up to date?

[Tesla DeLorean]

It is the JTAG TDO / PB3 pin, can be used to implement the Serial Wire Viewer functionality, an equivalent to the Debug Communication Channel of the older ARM's

http://blog.atollic.com/cortex-m-debugging-introduction-to-serial-wire-viewer-swv-event-and-data-tracing

[VNado.1]

I have just updated the ST-Link firmware to V2.J33.S7 (latest)

[VNado.1]

However I see that on the  STM32L4P5G-DK development board they have included the STLINK-V3E. Is it due to compatibility or simply to showcase their latest programmer?

[VNado.1]

Is the SWO pin absolutely necessary if I don't use the Serial Wire Viewer? My PB3 pin is already used for something else

[Tesla DeLorean]

Most likely because it is 2020 and not 2010​