Can't get SDW via ST-Link/v2 to work

[vneff]

Posted on July 31, 2014 at 23:29

Hi,

I just received a new prototype with a STM32F215 processor and it is set up to use the SWD interface to initially flash the unit. on the ST-Link/v2 I have connected: pins 3,5 & 10 to gnd (3 & 5 to reduce noise) pin 9 to SWDIO on the processor pin 11 to SWCLK on the processor I have verified the following on the processor: The VDDs are at 3.3v BOOT0 is pulled to ground BOOT1 is floating Vcap_1 & VCAP_2 are at ~ 1.2 v NRST & RESET are high There is a clock on OSC_IN VBAT is connected to 3.3 v In the STM32 ST-LINK Utility: Utility version v3.3.0 USB Driver version v4.3.1.0 ST-Link CLI version V1.9.0 ST-Link version V2.J21.S4 STM32+STM8 Debugger Settings: SWD Coneect Under Reset and tried Normal and tried Hot Plug Enable debug in Low power mode, tried unselected When connecting, I always get: Can not connect to target! Please select ''Connect Under Reset'' .... or If you're trying to connect to an STM32W1xx ... I verified that there seems to be activity on both the SWDIO & SWCLK lines when attempting to connect. Any hints as to what further to check? Thanks for any help! Vance #stm32f2xx-swd-st-link

[stm32forum]

Posted on July 31, 2014 at 23:46

nope, Should be pin 7 and 9. Also connect Vcc (3.3V)

[vneff]

Posted on August 01, 2014 at 01:10

Thanks for the response!

Actually, it was pins 7 & 9. Sorry for the typo. I had thought the VCC connection was optional.  That is going to be difficult.  Very small board with all tiny parts.  I'll see what I can do and report back tomorrow. Vance

[vneff]

Posted on August 01, 2014 at 14:51

I made the connection between Vcc and pin 1 of the ST-Link/v2.  Still no joy.

any other ideas? Vance

[Tesla DeLorean]

Posted on August 01, 2014 at 16:22

Voltages suggest the part orientation is correct.

Sure you don't have SWDIO/SWCLK switched around, or connected to the wrong pins on the IC? Time to dig into the schematic. Can you pull BOOT0 High and check for USART1 (PA9/PA10) connectivity to the System Loader? ie RealTerm at 9600 8E1, sending 0x7F, seeing 0x79 response? I perhaps would have wired up SWO and NRST, and used a standard header connector. VCC is semi-optional depending on if the JTAG/SWD pod has line drivers. Bonding pin 1 & 2 of the 20-pin JTAG header should be sufficient to resolve that. NRST should not be driven high, or attached to VDD directly.

[vneff]

Posted on August 01, 2014 at 16:57

I'm very embarrassed to say, during one of my soldering events, I ended up connecting the the connector to the prototype upside down :(

I do have communications now! As a follow up, Vcc apparently does need to be connected to the ST-Link/v2. Thank you very much for your help! Vance