AnsweredAssumed Answered

J-Link could not "connect under reset" to the STM32F103RD

Question asked by aldana.paul on Aug 2, 2016
Latest reply on Aug 4, 2016 by aldana.paul
Hello, 
I am using the Segger J-Link+ to connect to my target board with the STM32F103RD chip installed. I connected all the necessary pins of the target board (TMS, TDO, TDI, NTRST, TCK, and RESET) to the corresponding pins of the J-Link. Before, I was able to connect to the target board and upload my firmware using J-Flash with no problem. All of a sudden, when I was trying to upload new firmware to the board, I got the "ERROR: STM32: Connecting to CPU via connect under reset failed." I've been looking for possible solutions, but still no luck and I've resorted on posting in this forum.

All the connections are connected properly and the board is powered up as before. The chip doesn't seem to be bricked since the last firmware that I loaded is still running whenever I push the buttons. 

I really hope someone could help me with this. Any help will be appreciated. 

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