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ST-Link/V2 no connecing but with JLinkPro no problem

Question asked by Roger Heil on Jan 13, 2017
Latest reply on Jan 21, 2017 by kaltofen.jupp

I have a problem with the ST-Link / V2. I have designed my own board and if I want to access the STM32L476RG via JTAG, the ST-Link Utility write the following lines into the Trace.txt file:


ST-Link/V2 device detected
Target voltage detected: 3.508662
Error (0x8) after target cmd F2 30 A4 00 00 00 00 00 00 00
Error (19) while initializing ST-Link in JTAG mode


If I use a Segger JLink Pro, I can flash and debug the MCU without any problems.


Can anyone explain this?


best regards