ST Link V2 and V3 VS STM32G0B

[grisom13]

Hello,

I have a STM32G0B1KBU3N MCU for my USB-C PD board. I am a new with this so learning. I am currently finished assemble my own PCB and have some issue with programming the controller. I can program controller with ST link V3-minie but have Zero luck to go connect with ST LInk v2. Is my controller supports only V3 hardware? I saw in the Programmer menu with V2 hardware there is only 4 kHz frequency and V3 hardware offers 8 kHz (same as controller internal clock) am I right? Thank you.

[Karl Yamashita]

Show a schematic of your STM32 connections.  

[grisom13]

  

[mfgkw]

1. In your schematic I see no RST connection to the ST-Link 

2. Is the Jumper JP9 for 3.3V to ST-Link closed?

3. What do you mean with "St Link v2"? Is it a genuine ST-Link from ST or some fake "ST-Link v2 mini"?

[grisom13]

Hello,

1 - Yes, there is no RST on a schematic (didn't know its required). But the wire is added to RST pin on STM32. And here hence is a question: STM Programmer offers "Hardware reset". Is this with a manual Reset switch? Or I am missing something?

2 - Yes I put the jumper to my diagram because I didn't know if ST link supply power. When I found out its not the JP9 jumper was closed and I can see 3.3V in "Target voltage section" 

3 - All product come from Mouser. So yes genuine. The V2 white plastic Programmer hardware can't connect to my STM32 chip. The V3-minie that is a bare PCB - I can connect to my SMT32 controller and upload firmware. Any ideas why V2 cant do the job? Thank you 

[Karl Yamashita]

So how did you connect the ST-Link V2 20-pin to your 4-pin header? You must have some sort of custom harness/adapter. Double check to be sure SWDIO and SWCLK are not swapped.

[grisom13]

Karl,

Have 10+ years experience with wiring harnesses. So 5 wires is not a problem. Like I said V3 is working (despite it uses 14 pin Samtec connector) . V2 is not. Is there any setup I need to do for V2 that is different from V3? for the STM32G0B1KBU3N ?  The connection of wires is right as long as the pinout layout in datasheet is correct Versus connector KEY lock.

[mfgkw]

Did you try "Software Reset"?

[Karl Yamashita]

Ok, so what pins are you using on the 20-pin?

You only need 4 connections from the ST-Link v2, GND, VCC, SWDIO and SWCLK. The NRST isn't required, unless you need the software to have the ST-Link hold the device in reset after programming.

If you are now reading ~3.3V from the console now that JP9 is closed, that leaves the 2 SWxxx pins. So either they are not connected to the 20-pin correctly or the ST-Link V2 is bad. I'm leaning towards the former.

[grisom13]

Hi Karl, 

In fact I have connected about 11 ground wires. I saw it says "at least one GND, but because I couldn't connect I put them all. The only guide to read pinout properly is a cutout on a ST link body where 20 pin connector goes. Like the picture above.