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Francesco Sfragara
Francesco Sfragara
Associate
Feb 19, 2018 1:48 PM UTC
Question

Keil: SWDIO no target connected

Posted on February 19, 2018 at 14:48

I'm using a stm32f407vg board. Suddenly I can't download my code to flash memory anymore. I'm using the keil toolchain. I tried stm32 st-link utility, but it can't connect to target either. I tried the option 'connect under reset', but it didn't work. I tried to unistall and install again the st link drivers and utility, but it didn't work. 

Can somebody please help me? Thanks.

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    8 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    Feb 19, 2018 2:32 PM UTC
    Posted on February 19, 2018 at 15:32

    Try pulling BOOT0 high, reset, and program/erase via ST-LINK Utilities

    Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
    Andrew Neil
    Andrew Neil
    Super User
    Feb 19, 2018 2:56 PM UTC
    Posted on February 19, 2018 at 15:56

    Cross-post: 

    http://www.keil.com/forum/63376

     
    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    ACarb
    ACarb
    Visitor II
    Nov 14, 2018 12:34 PM UTC

    I've solved the issue following these steps:

    -Install STM32 ST-LINK Utility;

    -Open it, click on ST-LINK -> Firmware update;

    -Plug your board, then click on Device Connect. If the board is recognised proceed with the firmware update (click yes), otherwise check if the drivers are correctly installed;

    -Click on Target -> Settings. Under "Mode" select "Connect under reset". Leave all the other settings as default;

    -Go on Target -> Connect. You are now connected to the board (see the registers);

    -Finally click on the red Rubber figure (Full Chip Erase).

    Now you should be able to download your code into the flash using Keil.

      RKlaj
      RKlaj
      Visitor II
      May 21, 2019 6:13 PM UTC

      Hi, thank you for sharing the solution! I had the same issue and it worked for me too.

      ersinkecis
      ersinkecis
      Visitor II
      Jun 30, 2019 9:53 PM UTC

      hi, thank you for all.

      but this solution is not working for me. :(

      sometimes connecting. sometimes does not connect.

      Is there anyone have an idea?

      STLinkUSBDriver.dll v5.1.2.0

      ST-LINK Firmware v2.J34.S7

      Tesla DeLorean
      Tesla DeLorean
      Guru
      Jun 30, 2019 11:45 PM UTC

      Does your device go into a low power mode? Interfere with clocks, or pins related to SWD interface? NRST connected?

      Try "Connect Under Reset"

      Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
      ersinkecis
      ersinkecis
      Visitor II
      Jul 1, 2019 10:09 PM UTC

      like you said, because I use a low-powered power supply. thank you so much.

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