There's a bug of latest ST-Link firmware

[zjuniverse]

Posted on September 14, 2014 at 11:31

I'm using the st-link on stm32f4 discovery. I had upgrated the firmware to V2.J21.S0, and there's something wrong when using the printf via SWO. The printf data number inceases fast but there is no data shown in the window. After reconnecting the USB port, and restart the SWO viewer, it works correctly. The problem occors again when the program of target board is reprogramed, or reconnecting the ST-Link in ST-Link utility. I tried downgrade the firmware from V2.J21.S0 to V2.J17.S0 and it just works fine. So I think there's a bug in the firmware.

[S C]

Posted on September 15, 2014 at 11:15

Hello,

I confirm there was a regression in SWV management in firmwares V2J19 to V2J21 included. A version fixing the issue should be available during this week at

http://www.st.com/web/en/catalog/tools/PF260217

. The upgrade can also and already be found on ARM website :

https://mbed.org/teams/ST/wiki/Nucleo-Firmware