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michaels2
michaels2
Associate
May 2, 2012
Question

STM32F3210E-Eval not responding via JTAG

  • May 2, 2012
  • 3 replies
  • 703 views
Posted on May 02, 2012 at 16:31

Hi,

we are using three STM32F3210E-Eval for about 1 year now. Recently 2 of these boards stopped responding via JTAG. The JTAG interface used is a Segger J-Link Edu. Different J-Links on different PCs have not made a difference. The third board still works fine. The J-Link Commander from Segger gives the error message ''TDO is constantly high''. I have also tried lowering the JTAG frequency and using SWD instead. Nothing works.

Any suggestions?

Regards,

Tobias
    This topic has been closed for replies.

    3 replies

    frankmeyer9
    frankmeyer9
    Associate III
    May 2, 2012
    Posted on May 02, 2012 at 16:42

    Somethink like this ?

    [DEAD LINK /public/STe2ecommunities/mcu/Lists/STM32Discovery/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/STM32Discovery/STM32F4DISCOVERY Cannot connect to the MCU device&FolderCTID=0x01200200770978C69A1141439FE559EB459D75800084C20D8867EAD444A5987D47BE638E0F&TopicsView=https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/AllItems.aspx&currentviews=287]https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/Flat.aspx?RootFolder=%2fpublic%2fSTe2ecommunities%2fmcu%2fLists%2fSTM32Discovery%2fSTM32F4DISCOVERY%20%20%20Cannot%20connect%20to%20the%20MCU%20device&FolderCTID=0x01200200770978C69A1141439FE559EB459D75800084C20D8867EAD444A5987D47BE638E0F&TopicsView=https%3A%2F%2Fmy.st.com%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2FSTM32Discovery%2FAllItems.aspx¤tviews=287

    Tesla DeLorean
    Tesla DeLorean
    Guru
    May 2, 2012
    Posted on May 02, 2012 at 17:05

    It's frankly more probable you have code early in the reset path that alters the GPIO's used by JTAG/SWD, or DMA or WFI loop. A quick test would be to get the BOOT0 pin high so that it enters the System ROM at reset instead, this acts as a safe harbour from where you can erase and program the flash.

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    michaels2
    michaels2Author
    Associate
    May 3, 2012
    Posted on May 03, 2012 at 14:40

    I tried before to erase the flash via the built-in bootloader. But that did not fix the problem. I will now hook up an osci and see, if the mcu really does not respond on the TDO pin.

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